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# EspSoftwareSerial
## Implementation of the Arduino software serial library for the ESP8266 / ESP32
This fork implements interrupt service routine best practice.
In the receive interrupt, instead of blocking for whole bytes
at a time - voiding any near-realtime behavior of the CPU - only level
change and timestamp are recorded. The more time consuming phase
detection and byte assembly are done in the main code.
Except at high bitrates, depending on other ongoing activity,
interrupts in particular, this software serial adapter
supports full duplex receive and send. At high bitrates (115200bps)
send bit timing can be improved at the expense of blocking concurrent
full duplex receives, with the ``SoftwareSerial::enableIntTx(false)`` function call.
The same functionality is given as the corresponding AVR library but
several instances can be active at the same time. Speed up to 115200 baud
is supported. Besides a constructor compatible to the AVR SoftwareSerial class,
and updated constructor that takes no arguments exists, instead the ``begin()``
function can handle the pin assignments and logic inversion.
It also has optional input buffer capacity arguments for byte buffer and ISR bit buffer.
This way, it is a better drop-in replacement for the hardware serial APIs on the ESP MCUs.
Please note that due to the fact that the ESPs always have other activities
ongoing, there will be some inexactness in interrupt timings. This may
lead to inevitable, but few, bit errors when having heavy data traffic
at high baud rates.
## Resource optimization
The memory footprint can be optimized to just fit the amount of expected
incoming asynchronous data.
For this, the ``SoftwareSerial`` constructor provides two arguments. First, the
octet buffer capacity for assembled received octets can be set. Read calls are
satisfied from this buffer, freeing it in return.
Second, the signal edge detection buffer of 32bit fields can be resized.
One octet may require up to to 10 fields, but fewer may be needed,
depending on the bit pattern. Any read or write calls check this buffer
to assemble received octets, thus promoting completed octets to the octet
buffer, freeing fields in the edge detection buffer.
Look at the swsertest.ino example. There, on reset, ASCII characters ' ' to 'z'
are sent. This happens not as a block write, but in a single write call per
character. As the example uses a local loopback wire, every outgoing bit is
immediately received back. Therefore, any single write call causes up to
10 fields - depending on the exact bit pattern - to be occupied in the signal
edge detection buffer. In turn, as explained before, each single write call
also causes received bit assembly to be performed, promoting these bits from
the signal edge detection buffer to the octet buffer as soon as possible.
Explaining by way of contrast, if during a a single write call, perhaps because
of using block writing, more than a single octet is received, there will be a
need for more than 10 fields in the signal edge detection buffer.
The necessary capacity of the octet buffer only depends on the amount of incoming
data until the next read call.
For the swsertest.ino example, this results in the following optimized
constructor arguments to spend only the minimum RAM on buffers required:
The octet buffer capacity (``bufCapacity``) is 93 (91 characters net plus two tolerance).
The signal edge detection buffer capacity (``isrBufCapacity``) is 10, as each octet has
10 bits on the wire, which are immediately received during the write, and each
write call causes the signal edge detection to promote the previously sent and
received bits to the octet buffer.
In a more generalized scenario, calculate the bits (use message size in octets
times 10) that may be asynchronously received to determine the value for
``isrBufCapacity`` in the constructor. Also use the number of received octets
that must be buffered for reading as the value of ``bufCapacity``.
The more frequently your code calls write or read functions, the greater the
chances are that you can reduce the ``isrBufCapacity`` footprint without losing data,
and each time you call read to fetch from the octet buffer, you reduce the
need for space there.
## SoftwareSerialConfig and parity
The configuration of the data stream is done via a ``SoftwareSerialConfig``
argument to ``begin()``. Word lengths can be set to between 5 and 8 bits, parity
can be N(one), O(dd) or E(ven) and 1 or 2 stop bits can be used. The default is
``SWSERIAL_8N1`` using 8 bits, no parity and 1 stop bit but any combination can
be used, e.g. ``SWSERIAL_7E2``. If using EVEN or ODD parity, any parity errors
can be detected with the ``peekParityError()`` function. Note that parity
checking must be done before ``read()``, as the parity information is removed
from the buffer when reading the corresponding byte.
To allow flexible 9-bit and data/addressing protocols, the additional parity
modes MARK and SPACE are also available. Furthermore, the parity mode can be
individually set in each call to ``write()``.
This allows a simple implementation of protocols where the parity bit is used to
distinguish between data and addresses/commands ("9-bit" protocols). First set
up SoftwareSerial with parity mode SPACE, e.g. ``SWSERIAL_8S1``. This will add a
parity bit to every byte sent, setting it to logical zero (SPACE parity).
To detect incoming bytes with the parity bit set (MARK parity), use the
``peekParityError()`` function. To send a byte with the parity bit set, just add
``MARK`` as the second argument when writing, e.g. ``write(ch, MARK)``.
## Using and updating EspSoftwareSerial in the esp8266com/esp8266 Arduino build environment
EspSoftwareSerial is both part of the BSP download for ESP8266 in Arduino,
and it is set up as a Git submodule in the esp8266 source tree,
specifically in ``.../esp8266/libraries/SoftwareSerial`` when using a Github
repository clone in your Arduino sketchbook hardware directory.
This supersedes any version of EspSoftwareSerial installed for instance via
the Arduino library manager, it is not required to install EspSoftwareSerial
for the ESP8266 separately at all, but doing so has ill effect.
The responsible maintainer of the esp8266 repository has kindly shared the
following command line instructions to use, if one wishes to manually
update EspSoftwareSerial to a newer release than pulled in via the ESP8266 Arduino BSP:
To update esp8266/arduino SoftwareSerial submodule to lastest master:
Clean it (optional):
```shell
$ rm -rf libraries/SoftwareSerial
$ git submodule update --init
```
Now update it:
```shell
$ cd libraries/SoftwareSerial
$ git checkout master
$ git pull
```

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#include <SoftwareSerial.h>
// On ESP8266:
// Local SoftwareSerial loopback, connect D5 (rx) and D6 (tx).
// For local hardware loopback, connect D5 to D8 (tx), D6 to D7 (rx).
// For hardware send/sink, connect D7 (rx) and D8 (tx).
// Hint: The logger is run at 9600bps such that enableIntTx(true) can remain unchanged. Blocking
// interrupts severely impacts the ability of the SoftwareSerial devices to operate concurrently
// and/or in duplex mode.
// Operating in software serial full duplex mode, runs at 19200bps and few errors (~2.5%).
// Operating in software serial half duplex mode (both loopback and repeater),
// runs at 57600bps with nearly no errors.
// Operating loopback in full duplex, and repeater in half duplex, runs at 38400bps with nearly no errors.
// On ESP32:
// For SoftwareSerial or hardware send/sink, connect D5 (rx) and D6 (tx).
// Hardware Serial2 defaults to D4 (rx), D3 (tx).
// For local hardware loopback, connect D5 (rx) to D3 (tx), D6 (tx) to D4 (rx).
#if defined(ESP8266) && !defined(D5)
#define D5 (14)
#define D6 (12)
#define D7 (13)
#define D8 (15)
#define TX (1)
#endif
// Pick only one of HWLOOPBACK, HWSOURCESWSINK, or HWSOURCESINK
//#define HWLOOPBACK 1
//#define HWSOURCESWSINK 1
//#define HWSOURCESINK 1
#define HALFDUPLEX 1
#ifdef ESP32
constexpr int IUTBITRATE = 19200;
#else
constexpr int IUTBITRATE = 19200;
#endif
#if defined(ESP8266)
constexpr SoftwareSerialConfig swSerialConfig = SWSERIAL_8E1;
constexpr SerialConfig hwSerialConfig = SERIAL_8E1;
#elif defined(ESP32)
constexpr SoftwareSerialConfig swSerialConfig = SWSERIAL_8E1;
constexpr uint32_t hwSerialConfig = SERIAL_8E1;
#else
constexpr unsigned swSerialConfig = 3;
#endif
constexpr bool invert = false;
constexpr int BLOCKSIZE = 16; // use fractions of 256
unsigned long start;
String effTxTxt("eff. tx: ");
String effRxTxt("eff. rx: ");
int txCount;
int rxCount;
int expected;
int rxErrors;
int rxParityErrors;
constexpr int ReportInterval = IUTBITRATE / 8;
#if defined(ESP8266)
#if defined(HWLOOPBACK) || defined(HWSOURCESWSINK)
HardwareSerial& hwSerial(Serial);
SoftwareSerial serialIUT;
SoftwareSerial logger;
#elif defined(HWSOURCESINK)
HardwareSerial& serialIUT(Serial);
SoftwareSerial logger;
#else
SoftwareSerial serialIUT;
HardwareSerial& logger(Serial);
#endif
#elif defined(ESP32)
#if defined(HWLOOPBACK) || defined (HWSOURCESWSINK)
HardwareSerial& hwSerial(Serial2);
SoftwareSerial serialIUT;
#elif defined(HWSOURCESINK)
HardwareSerial& serialIUT(Serial2);
#else
SoftwareSerial serialIUT;
#endif
HardwareSerial& logger(Serial);
#else
SoftwareSerial serialIUT(14, 12);
HardwareSerial& logger(Serial);
#endif
void setup() {
#if defined(ESP8266)
#if defined(HWLOOPBACK) || defined(HWSOURCESINK) || defined(HWSOURCESWSINK)
Serial.begin(IUTBITRATE, hwSerialConfig, SERIAL_FULL, 1, invert);
Serial.swap();
Serial.setRxBufferSize(2 * BLOCKSIZE);
logger.begin(9600, SWSERIAL_8N1, -1, TX);
#else
logger.begin(9600);
#endif
#if !defined(HWSOURCESINK)
serialIUT.begin(IUTBITRATE, swSerialConfig, D5, D6, invert, 2 * BLOCKSIZE);
#ifdef HALFDUPLEX
serialIUT.enableIntTx(false);
#endif
#endif
#elif defined(ESP32)
#if defined(HWLOOPBACK) || defined(HWSOURCESWSINK)
Serial2.begin(IUTBITRATE, hwSerialConfig, D4, D3, invert);
Serial2.setRxBufferSize(2 * BLOCKSIZE);
#elif defined(HWSOURCESINK)
serialIUT.begin(IUTBITRATE, hwSerialConfig, D5, D6, invert);
serialIUT.setRxBufferSize(2 * BLOCKSIZE);
#endif
#if !defined(HWSOURCESINK)
serialIUT.begin(IUTBITRATE, swSerialConfig, D5, D6, invert, 2 * BLOCKSIZE);
#ifdef HALFDUPLEX
serialIUT.enableIntTx(false);
#endif
#endif
logger.begin(9600);
#else
#if !defined(HWSOURCESINK)
serialIUT.begin(IUTBITRATE);
#endif
logger.begin(9600);
#endif
logger.println("Loopback example for EspSoftwareSerial");
start = micros();
txCount = 0;
rxCount = 0;
rxErrors = 0;
rxParityErrors = 0;
expected = -1;
}
unsigned char c = 0;
void loop() {
#ifdef HALFDUPLEX
char block[BLOCKSIZE];
#endif
char inBuf[BLOCKSIZE];
for (int i = 0; i < BLOCKSIZE; ++i) {
#ifndef HALFDUPLEX
#ifdef HWSOURCESWSINK
hwSerial.write(c);
#else
serialIUT.write(c);
#endif
#ifdef HWLOOPBACK
int avail = hwSerial.available();
while ((0 == (i % 8)) && avail > 0) {
int inCnt = hwSerial.read(inBuf, min(avail, min(BLOCKSIZE, hwSerial.availableForWrite())));
hwSerial.write(inBuf, inCnt);
avail -= inCnt;
}
#endif
#else
block[i] = c;
#endif
c = (c + 1) % 256;
++txCount;
}
#ifdef HALFDUPLEX
#ifdef HWSOURCESWSINK
hwSerial.write(block, BLOCKSIZE);
#else
serialIUT.write(block, BLOCKSIZE);
#endif
#endif
#ifdef HWSOURCESINK
#if defined(ESP8266)
if (serialIUT.hasOverrun()) { logger.println("serialIUT.overrun"); }
#endif
#else
if (serialIUT.overflow()) { logger.println("serialIUT.overflow"); }
#endif
int inCnt;
uint32_t deadlineStart;
#ifdef HWLOOPBACK
// starting deadline for the first bytes to become readable
deadlineStart = ESP.getCycleCount();
inCnt = 0;
while ((ESP.getCycleCount() - deadlineStart) < (1000000UL * 12 * BLOCKSIZE) / IUTBITRATE * 24 * ESP.getCpuFreqMHz()) {
int avail = hwSerial.available();
inCnt += hwSerial.read(&inBuf[inCnt], min(avail, min(BLOCKSIZE - inCnt, hwSerial.availableForWrite())));
if (inCnt >= BLOCKSIZE) { break; }
// wait for more outstanding bytes to trickle in
if (avail) deadlineStart = ESP.getCycleCount();
}
hwSerial.write(inBuf, inCnt);
#endif
// starting deadline for the first bytes to come in
deadlineStart = ESP.getCycleCount();
inCnt = 0;
while ((ESP.getCycleCount() - deadlineStart) < (1000000UL * 12 * BLOCKSIZE) / IUTBITRATE * 8 * ESP.getCpuFreqMHz()) {
int avail;
if (0 != (swSerialConfig & 070))
avail = serialIUT.available();
else
avail = serialIUT.read(inBuf, BLOCKSIZE);
for (int i = 0; i < avail; ++i)
{
unsigned char r;
if (0 != (swSerialConfig & 070))
r = serialIUT.read();
else
r = inBuf[i];
if (expected == -1) { expected = r; }
else {
expected = (expected + 1) % (1UL << (5 + swSerialConfig % 4));
}
if (r != expected) {
++rxErrors;
expected = -1;
}
#ifndef HWSOURCESINK
if (serialIUT.readParity() != (static_cast<bool>(swSerialConfig & 010) ? serialIUT.parityOdd(r) : serialIUT.parityEven(r)))
{
++rxParityErrors;
}
#endif
++rxCount;
++inCnt;
}
if (inCnt >= BLOCKSIZE) { break; }
// wait for more outstanding bytes to trickle in
if (avail) deadlineStart = ESP.getCycleCount();
}
const uint32_t interval = micros() - start;
if (txCount >= ReportInterval && interval) {
uint8_t wordBits = (5 + swSerialConfig % 4) + static_cast<bool>(swSerialConfig & 070) + 1 + ((swSerialConfig & 0300) ? 1 : 0);
logger.println(String("tx/rx: ") + txCount + "/" + rxCount);
const long txCps = txCount * (1000000.0 / interval);
const long rxCps = rxCount * (1000000.0 / interval);
logger.print(effTxTxt + wordBits * txCps + "bps, "
+ effRxTxt + wordBits * rxCps + "bps, "
+ rxErrors + " errors (" + 100.0 * rxErrors / (!rxErrors ? 1 : rxCount) + "%)");
if (0 != (swSerialConfig & 070))
{
logger.print(" ("); logger.print(rxParityErrors); logger.println(" parity errors)");
}
else
{
logger.println();
}
txCount = 0;
rxCount = 0;
rxErrors = 0;
rxParityErrors = 0;
expected = -1;
// resync
delay(1000UL * 12 * BLOCKSIZE / IUTBITRATE * 16);
serialIUT.flush();
start = micros();
}
}

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EspSoftwareSerial/examples/onewiretest/onewiretest.ino Normal file
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#include <ESP8266WiFi.h>
#include "SoftwareSerial.h"
SoftwareSerial swSer1;
SoftwareSerial swSer2;
void setup() {
delay(2000);
Serial.begin(115200);
Serial.println("\nOne Wire Half Duplex Serial Tester");
swSer1.begin(115200, SWSERIAL_8N1, 12, 12, false, 256);
swSer1.enableIntTx(true);
swSer2.begin(115200, SWSERIAL_8N1, 14, 14, false, 256);
swSer2.enableIntTx(true);
}
void loop() {
Serial.println("\n\nTesting on swSer1");
Serial.print("Enter something to send using swSer1.");
checkSwSerial(&swSer1);
Serial.println("\n\nTesting on swSer2");
Serial.print("Enter something to send using swSer2.");
checkSwSerial(&swSer2);
}
void checkSwSerial(SoftwareSerial* ss) {
byte ch;
while (!Serial.available());
ss->enableTx(true);
while (Serial.available()) {
ch = Serial.read();
ss->write(ch);
}
ss->enableTx(false);
// wait 1 second for the reply from SOftwareSerial if any
delay(1000);
if (ss->available()) {
Serial.print("\nResult:");
while (ss->available()) {
ch = (byte)ss->read();
Serial.print(ch < 0x01 ? " 0" : " ");
Serial.print(ch, HEX);
}
Serial.println();
}
}

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EspSoftwareSerial/examples/repeater/repeater.ino Normal file
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#include <SoftwareSerial.h>
// On ESP8266:
// SoftwareSerial loopback for remote source (loopback.ino), or hardware loopback.
// Connect source D5 (rx) to local D8 (tx), source D6 (tx) to local D7 (rx).
// Hint: The logger is run at 9600bps such that enableIntTx(true) can remain unchanged. Blocking
// interrupts severely impacts the ability of the SoftwareSerial devices to operate concurrently
// and/or in duplex mode.
// On ESP32:
// For software or hardware loopback, connect source rx to local D8 (tx), source tx to local D7 (rx).
#if defined(ESP8266) && !defined(D5)
#define D5 (14)
#define D6 (12)
#define D7 (13)
#define D8 (15)
#define TX (1)
#endif
#define HWLOOPBACK 1
#define HALFDUPLEX 1
#ifdef ESP32
constexpr int IUTBITRATE = 19200;
#else
constexpr int IUTBITRATE = 19200;
#endif
#if defined(ESP8266)
constexpr SoftwareSerialConfig swSerialConfig = SWSERIAL_8E1;
constexpr SerialConfig hwSerialConfig = SERIAL_8E1;
#elif defined(ESP32)
constexpr SoftwareSerialConfig swSerialConfig = SWSERIAL_8E1;
constexpr uint32_t hwSerialConfig = SERIAL_8E1;
#else
constexpr unsigned swSerialConfig = 3;
#endif
constexpr bool invert = false;
constexpr int BLOCKSIZE = 16; // use fractions of 256
unsigned long start;
String bitRateTxt("Effective data rate: ");
int rxCount;
int seqErrors;
int parityErrors;
int expected;
constexpr int ReportInterval = IUTBITRATE / 8;
#if defined(ESP8266)
#if defined(HWLOOPBACK)
HardwareSerial& repeater(Serial);
SoftwareSerial logger;
#else
SoftwareSerial repeater;
HardwareSerial& logger(Serial);
#endif
#elif defined(ESP32)
#if defined(HWLOOPBACK)
HardwareSerial& repeater(Serial2);
#else
SoftwareSerial repeater;
#endif
HardwareSerial& logger(Serial);
#else
SoftwareSerial repeater(14, 12);
HardwareSerial& logger(Serial);
#endif
void setup() {
#if defined(ESP8266)
#if defined(HWLOOPBACK)
repeater.begin(IUTBITRATE, hwSerialConfig, SERIAL_FULL, 1, invert);
repeater.swap();
repeater.setRxBufferSize(2 * BLOCKSIZE);
logger.begin(9600, SWSERIAL_8N1, -1, TX);
#else
repeater.begin(IUTBITRATE, swSerialConfig, D7, D8, invert, 4 * BLOCKSIZE);
#ifdef HALFDUPLEX
repeater.enableIntTx(false);
#endif
logger.begin(9600);
#endif
#elif defined(ESP32)
#if defined(HWLOOPBACK)
repeater.begin(IUTBITRATE, hwSerialConfig, D7, D8, invert);
repeater.setRxBufferSize(2 * BLOCKSIZE);
#else
repeater.begin(IUTBITRATE, swSerialConfig, D7, D8, invert, 4 * BLOCKSIZE);
#ifdef HALFDUPLEX
repeater.enableIntTx(false);
#endif
#endif
logger.begin(9600);
#else
repeater.begin(IUTBITRATE);
logger.begin(9600);
#endif
logger.println("Repeater example for EspSoftwareSerial");
start = micros();
rxCount = 0;
seqErrors = 0;
parityErrors = 0;
expected = -1;
}
void loop() {
#ifdef HWLOOPBACK
#if defined(ESP8266)
if (repeater.hasOverrun()) { logger.println("repeater.overrun"); }
#endif
#else
if (repeater.overflow()) { logger.println("repeater.overflow"); }
#endif
#ifdef HALFDUPLEX
char block[BLOCKSIZE];
#endif
// starting deadline for the first bytes to come in
uint32_t deadlineStart = ESP.getCycleCount();
int inCnt = 0;
while ((ESP.getCycleCount() - deadlineStart) < (1000000UL * 12 * BLOCKSIZE) / IUTBITRATE * 24 * ESP.getCpuFreqMHz()) {
int avail = repeater.available();
for (int i = 0; i < avail; ++i)
{
int r = repeater.read();
if (r == -1) { logger.println("read() == -1"); }
if (expected == -1) { expected = r; }
else {
expected = (expected + 1) % (1UL << (5 + swSerialConfig % 4));
}
if (r != expected) {
++seqErrors;
expected = -1;
}
#ifndef HWLOOPBACK
if (repeater.readParity() != (static_cast<bool>(swSerialConfig & 010) ? repeater.parityOdd(r) : repeater.parityEven(r)))
{
++parityErrors;
}
#endif
++rxCount;
#ifdef HALFDUPLEX
block[inCnt] = r;
#else
repeater.write(r);
#endif
if (++inCnt >= BLOCKSIZE) { break; }
}
if (inCnt >= BLOCKSIZE) { break; }
// wait for more outstanding bytes to trickle in
if (avail) deadlineStart = ESP.getCycleCount();
}
#ifdef HALFDUPLEX
repeater.write(block, inCnt);
#endif
if (rxCount >= ReportInterval) {
auto end = micros();
unsigned long interval = end - start;
long cps = rxCount * (1000000.0 / interval);
long seqErrorsps = seqErrors * (1000000.0 / interval);
logger.print(bitRateTxt + 10 * cps + "bps, "
+ seqErrorsps + "cps seq. errors (" + 100.0 * seqErrors / rxCount + "%)");
#ifndef HWLOOPBACK
if (0 != (swSerialConfig & 070))
{
logger.print(" ("); logger.print(parityErrors); logger.print(" parity errors)");
}
else
#endif
{
logger.println();
}
start = end;
rxCount = 0;
seqErrors = 0;
parityErrors = 0;
expected = -1;
}
}

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EspSoftwareSerial/examples/servoTester/servoTester.ino Normal file
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#include <ESP8266WiFi.h>
#include <SoftwareSerial.h>
SoftwareSerial swSer;
byte buf[10] = { 0xFA, 0xAF,0x00,0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0xED };
byte cmd[10] = { 0xFA, 0xAF,0x00,0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0xED };
byte ver[10] = { 0xFC, 0xCF,0x00,0xAA,0x41, 0x16, 0x51, 0x01, 0x00, 0xED };
void setup() {
delay(2000);
Serial.begin(115200);
Serial.println("\nAlpha 1S Servo Tester");
swSer.begin(115200, SWSERIAL_8N1, 12, 12, false, 256);
}
void loop() {
for (int i = 1; i <= 32; i++) {
GetVersion(i);
delay(100);
}
SetLED(1, 0);
GoPos(1, 0, 50);
delay(1000);
GoPos(1, 90, 50);
delay(1000);
GoPos(1, 100, 50);
delay(1000);
SetLED(1, 1);
delay(2000);
}
void GetVersion(byte id) {
memcpy(buf, cmd, 10);
buf[0] = 0xFC;
buf[1] = 0xCF;
buf[2] = id;
buf[3] = 0x01;
SendCommand();
}
void GoPos(byte id, byte Pos, byte Time) {
memcpy(buf, cmd, 10);
buf[2] = id;
buf[3] = 0x01;
buf[4] = Pos;
buf[5] = Time;
buf[6] = 0x00;
buf[7] = Time;
SendCommand();
}
void GetPos(byte id) {
memcpy(buf, cmd, 10);
buf[2] = id;
buf[3] = 0x02;
SendCommand();
}
void SetLED(byte id, byte mode) {
memcpy(buf, cmd, 10);
buf[2] = id;
buf[3] = 0x04;
buf[4] = mode;
SendCommand();
}
void SendCommand() {
SendCommand(true);
}
void SendCommand(bool checkResult) {
byte sum = 0;
for (int i = 2; i < 8; i++) {
sum += buf[i];
}
buf[8] = sum;
ShowCommand();
swSer.flush();
swSer.enableTx(true);
swSer.write(buf, 10);
swSer.enableTx(false);
if (checkResult) checkReturn();
}
void ShowCommand() {
Serial.print(millis());
Serial.print(" OUT>>");
for (int i = 0; i < 10; i++) {
Serial.print((buf[i] < 0x10 ? " 0" : " "));
Serial.print(buf[i], HEX);
}
Serial.println();
}
void checkReturn() {
unsigned long startMs = millis();
while (((millis() - startMs) < 500) && (!swSer.available()));
if (swSer.available()) {
Serial.print(millis());
Serial.print(" IN>>>");
while (swSer.available()) {
byte ch = (byte)swSer.read();
Serial.print((ch < 0x10 ? " 0" : " "));
Serial.print(ch, HEX);
}
Serial.println();
}
}

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EspSoftwareSerial/examples/swsertest/swsertest.ino Normal file
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// On ESP8266:
// At 80MHz runs up 57600ps, and at 160MHz CPU frequency up to 115200bps with only negligible errors.
// Connect pin 12 to 14.
#include <SoftwareSerial.h>
#if defined(ESP8266) && !defined(D5)
#define D5 (14)
#define D6 (12)
#define D7 (13)
#define D8 (15)
#endif
#ifdef ESP32
#define BAUD_RATE 57600
#else
#define BAUD_RATE 57600
#endif
// Reminder: the buffer size optimizations here, in particular the isrBufSize that only accommodates
// a single 8N1 word, are on the basis that any char written to the loopback SoftwareSerial adapter gets read
// before another write is performed. Block writes with a size greater than 1 would usually fail.
SoftwareSerial swSer;
void setup() {
Serial.begin(115200);
swSer.begin(BAUD_RATE, SWSERIAL_8N1, D5, D6, false, 95, 11);
Serial.println("\nSoftware serial test started");
for (char ch = ' '; ch <= 'z'; ch++) {
swSer.write(ch);
}
swSer.println("");
}
void loop() {
while (swSer.available() > 0) {
Serial.write(swSer.read());
yield();
}
while (Serial.available() > 0) {
swSer.write(Serial.read());
yield();
}
}

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EspSoftwareSerial/keywords.txt Normal file
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#######################################
# Syntax Coloring Map for SoftwareSerial
# (esp8266)
#######################################
#######################################
# Datatypes (KEYWORD1)
#######################################
SoftwareSerial KEYWORD1
#######################################
# Methods and Functions (KEYWORD2)
#######################################
begin KEYWORD2
baudRate KEYWORD2
setTransmitEnablePin KEYWORD2
enableIntTx KEYWORD2
overflow KEYWORD2
available KEYWORD2
peek KEYWORD2
read KEYWORD2
flush KEYWORD2
write KEYWORD2
enableRx KEYWORD2
enableTx KEYWORD2
listen KEYWORD2
end KEYWORD2
isListening KEYWORD2
stopListening KEYWORD2
onReceive KEYWORD2
perform_work KEYWORD2
#######################################
# Constants (LITERAL1)
#######################################
SW_SERIAL_UNUSED_PIN LITERAL1
SWSERIAL_5N1 LITERAL1
SWSERIAL_6N1 LITERAL1
SWSERIAL_7N1 LITERAL1
SWSERIAL_8N1 LITERAL1

15
EspSoftwareSerial/library.json Normal file
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{
"name": "EspSoftwareSerial",
"version": "6.6.1",
"keywords": [
"serial", "io", "softwareserial"
],
"description": "Implementation of the Arduino software serial for ESP8266/ESP32.",
"repository":
{
"type": "git",
"url": "https://github.com/plerup/espsoftwareserial"
},
"frameworks": "arduino",
"platforms": "*"
}

9
EspSoftwareSerial/library.properties Normal file
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name=EspSoftwareSerial
version=6.6.1
author=Peter Lerup, Dirk Kaar
maintainer=Peter Lerup <peter@lerup.com>
sentence=Implementation of the Arduino software serial for ESP8266/ESP32.
paragraph=
category=Signal Input/Output
url=https://github.com/plerup/espsoftwareserial/
architectures=esp8266,esp32

542
EspSoftwareSerial/src/SoftwareSerial.cpp Normal file
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/*
SoftwareSerial.cpp - Implementation of the Arduino software serial for ESP8266/ESP32.
Copyright (c) 2015-2016 Peter Lerup. All rights reserved.
Copyright (c) 2018-2019 Dirk O. Kaar. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "SoftwareSerial.h"
#include <Arduino.h>
#ifdef ESP32
#define xt_rsil(a) (a)
#define xt_wsr_ps(a)
#endif
constexpr uint8_t BYTE_ALL_BITS_SET = ~static_cast<uint8_t>(0);
SoftwareSerial::SoftwareSerial() {
m_isrOverflow = false;
}
SoftwareSerial::SoftwareSerial(int8_t rxPin, int8_t txPin, bool invert)
{
m_isrOverflow = false;
m_rxPin = rxPin;
m_txPin = txPin;
m_invert = invert;
}
SoftwareSerial::~SoftwareSerial() {
end();
}
bool SoftwareSerial::isValidGPIOpin(int8_t pin) {
#if defined(ESP8266)
return (pin >= 0 && pin <= 5) || (pin >= 12 && pin <= 15);
#elif defined(ESP32)
return pin == 0 || pin == 2 || (pin >= 4 && pin <= 5) || (pin >= 12 && pin <= 19) ||
(pin >= 21 && pin <= 23) || (pin >= 25 && pin <= 27) || (pin >= 32 && pin <= 35);
#else
return true;
#endif
}
void SoftwareSerial::begin(uint32_t baud, SoftwareSerialConfig config,
int8_t rxPin, int8_t txPin,
bool invert, int bufCapacity, int isrBufCapacity) {
if (-1 != rxPin) m_rxPin = rxPin;
if (-1 != txPin) m_txPin = txPin;
m_oneWire = (m_rxPin == m_txPin);
m_invert = invert;
m_dataBits = 5 + (config & 07);
m_parityMode = static_cast<SoftwareSerialParity>(config & 070);
m_stopBits = 1 + ((config & 0300) ? 1 : 0);
m_pduBits = m_dataBits + static_cast<bool>(m_parityMode) + m_stopBits;
m_bitCycles = (ESP.getCpuFreqMHz() * 1000000UL + baud / 2) / baud;
m_intTxEnabled = true;
if (isValidGPIOpin(m_rxPin)) {
std::unique_ptr<circular_queue<uint8_t> > buffer(new circular_queue<uint8_t>((bufCapacity > 0) ? bufCapacity : 64));
m_buffer = move(buffer);
if (m_parityMode)
{
std::unique_ptr<circular_queue<uint8_t> > parityBuffer(new circular_queue<uint8_t>((bufCapacity > 0) ? (bufCapacity + 7) / 8 : 8));
m_parityBuffer = move(parityBuffer);
m_parityInPos = m_parityOutPos = 1;
}
std::unique_ptr<circular_queue<uint32_t> > isrBuffer(new circular_queue<uint32_t>((isrBufCapacity > 0) ? isrBufCapacity : (sizeof(uint8_t) * 8 + 2) * bufCapacity));
m_isrBuffer = move(isrBuffer);
if (m_buffer && (!m_parityMode || m_parityBuffer) && m_isrBuffer) {
m_rxValid = true;
pinMode(m_rxPin, INPUT_PULLUP);
}
}
if (isValidGPIOpin(m_txPin)
#ifdef ESP8266
|| ((m_txPin == 16) && !m_oneWire)) {
#else
) {
#endif
m_txValid = true;
if (!m_oneWire) {
pinMode(m_txPin, OUTPUT);
digitalWrite(m_txPin, !m_invert);
}
}
if (!m_rxEnabled) { enableRx(true); }
}
void SoftwareSerial::end()
{
enableRx(false);
m_txValid = false;
if (m_buffer) {
m_buffer.reset();
}
m_parityBuffer.reset();
if (m_isrBuffer) {
m_isrBuffer.reset();
}
}
uint32_t SoftwareSerial::baudRate() {
return ESP.getCpuFreqMHz() * 1000000UL / m_bitCycles;
}
void SoftwareSerial::setTransmitEnablePin(int8_t txEnablePin) {
if (isValidGPIOpin(txEnablePin)) {
m_txEnableValid = true;
m_txEnablePin = txEnablePin;
pinMode(m_txEnablePin, OUTPUT);
digitalWrite(m_txEnablePin, LOW);
}
else {
m_txEnableValid = false;
}
}
void SoftwareSerial::enableIntTx(bool on) {
m_intTxEnabled = on;
}
void SoftwareSerial::enableTx(bool on) {
if (m_txValid && m_oneWire) {
if (on) {
enableRx(false);
pinMode(m_txPin, OUTPUT);
digitalWrite(m_txPin, !m_invert);
}
else {
pinMode(m_rxPin, INPUT_PULLUP);
enableRx(true);
}
}
}
void SoftwareSerial::enableRx(bool on) {
if (m_rxValid) {
if (on) {
m_rxCurBit = m_pduBits - 1;
// Init to stop bit level and current cycle
m_isrLastCycle = (ESP.getCycleCount() | 1) ^ m_invert;
if (m_bitCycles >= (ESP.getCpuFreqMHz() * 1000000UL) / 74880UL)
attachInterruptArg(digitalPinToInterrupt(m_rxPin), reinterpret_cast<void (*)(void*)>(rxBitISR), this, CHANGE);
else
attachInterruptArg(digitalPinToInterrupt(m_rxPin), reinterpret_cast<void (*)(void*)>(rxBitSyncISR), this, m_invert ? RISING : FALLING);
}
else {
detachInterrupt(digitalPinToInterrupt(m_rxPin));
}
m_rxEnabled = on;
}
}
int SoftwareSerial::read() {
if (!m_rxValid) { return -1; }
if (!m_buffer->available()) {
rxBits();
if (!m_buffer->available()) { return -1; }
}
auto val = m_buffer->pop();
if (m_parityBuffer)
{
m_lastReadParity = m_parityBuffer->peek() & m_parityOutPos;
m_parityOutPos <<= 1;
if (!m_parityOutPos)
{
m_parityOutPos = 1;
m_parityBuffer->pop();
}
}
return val;
}
size_t SoftwareSerial::read(uint8_t * buffer, size_t size) {
if (!m_rxValid) { return 0; }
size_t avail;
if (0 == (avail = m_buffer->pop_n(buffer, size))) {
rxBits();
avail = m_buffer->pop_n(buffer, size);
}
if (!avail) return 0;
if (m_parityBuffer) {
uint32_t parityBits = avail;
while (m_parityOutPos >>= 1) ++parityBits;
m_parityOutPos = (1 << (parityBits % 8));
m_parityBuffer->pop_n(nullptr, parityBits / 8);
}
return avail;
}
size_t SoftwareSerial::readBytes(uint8_t * buffer, size_t size) {
if (!m_rxValid || !size) { return 0; }
size_t count = 0;
const auto start = millis();
do {
count += read(&buffer[count], size - count);
if (count >= size) break;
yield();
} while (millis() - start < _timeout);
return count;
}
int SoftwareSerial::available() {
if (!m_rxValid) { return 0; }
rxBits();
int avail = m_buffer->available();
if (!avail) {
optimistic_yield(10000UL);
}
return avail;
}
void ICACHE_RAM_ATTR SoftwareSerial::preciseDelay(bool sync) {
if (!sync)
{
// Reenable interrupts while delaying to avoid other tasks piling up
if (!m_intTxEnabled) { xt_wsr_ps(m_savedPS); }
auto expired = ESP.getCycleCount() - m_periodStart;
if (expired < m_periodDuration)
{
auto ms = (m_periodDuration - expired) / ESP.getCpuFreqMHz() / 1000UL;
if (ms) delay(ms);
}
while ((ESP.getCycleCount() - m_periodStart) < m_periodDuration) { optimistic_yield(10000); }
// Disable interrupts again
if (!m_intTxEnabled) { m_savedPS = xt_rsil(15); }
}
else
{
while ((ESP.getCycleCount() - m_periodStart) < m_periodDuration) {}
}
m_periodDuration = 0;
m_periodStart = ESP.getCycleCount();
}
void ICACHE_RAM_ATTR SoftwareSerial::writePeriod(
uint32_t dutyCycle, uint32_t offCycle, bool withStopBit) {
preciseDelay(true);
if (dutyCycle)
{
digitalWrite(m_txPin, HIGH);
m_periodDuration += dutyCycle;
if (offCycle || (withStopBit && !m_invert)) preciseDelay(!withStopBit || m_invert);
}
if (offCycle)
{
digitalWrite(m_txPin, LOW);
m_periodDuration += offCycle;
if (withStopBit && m_invert) preciseDelay(false);
}
}
size_t SoftwareSerial::write(uint8_t byte) {
return write(&byte, 1);
}
size_t SoftwareSerial::write(uint8_t byte, SoftwareSerialParity parity) {
return write(&byte, 1, parity);
}
size_t SoftwareSerial::write(const uint8_t * buffer, size_t size) {
return write(buffer, size, m_parityMode);
}
size_t ICACHE_RAM_ATTR SoftwareSerial::write(const uint8_t * buffer, size_t size, SoftwareSerialParity parity) {
if (m_rxValid) { rxBits(); }
if (!m_txValid) { return -1; }
if (m_txEnableValid) {
digitalWrite(m_txEnablePin, HIGH);
}
// Stop bit: if inverted, LOW, otherwise HIGH
bool b = !m_invert;
uint32_t dutyCycle = 0;
uint32_t offCycle = 0;
if (!m_intTxEnabled) {
// Disable interrupts in order to get a clean transmit timing
m_savedPS = xt_rsil(15);
}
const uint32_t dataMask = ((1UL << m_dataBits) - 1);
bool withStopBit = true;
m_periodDuration = 0;
m_periodStart = ESP.getCycleCount();
for (size_t cnt = 0; cnt < size; ++cnt) {
uint8_t byte = ~buffer[cnt] & dataMask;
// push LSB start-data-parity-stop bit pattern into uint32_t
// Stop bits: HIGH
uint32_t word = ~0UL;
// parity bit, if any
if (parity && m_parityMode)
{
uint32_t parityBit;
switch (parity)
{
case SWSERIAL_PARITY_EVEN:
// from inverted, so use odd parity
parityBit = byte;
parityBit ^= parityBit >> 4;
parityBit &= 0xf;
parityBit = (0x9669 >> parityBit) & 1;
break;
case SWSERIAL_PARITY_ODD:
// from inverted, so use even parity
parityBit = byte;
parityBit ^= parityBit >> 4;
parityBit &= 0xf;
parityBit = (0x6996 >> parityBit) & 1;
break;
case SWSERIAL_PARITY_MARK:
parityBit = false;
break;
case SWSERIAL_PARITY_SPACE:
// suppresses warning parityBit uninitialized
default:
parityBit = true;
break;
}
word ^= parityBit << m_dataBits;
}
word ^= byte;
// Stop bit: LOW
word <<= 1;
if (m_invert) word = ~word;
for (int i = 0; i <= m_pduBits; ++i) {
bool pb = b;
b = word & (1UL << i);
if (!pb && b) {
writePeriod(dutyCycle, offCycle, withStopBit);
withStopBit = false;
dutyCycle = offCycle = 0;
}
if (b) {
dutyCycle += m_bitCycles;
}
else {
offCycle += m_bitCycles;
}
}
withStopBit = true;
}
writePeriod(dutyCycle, offCycle, true);
if (!m_intTxEnabled) {
// restore the interrupt state
xt_wsr_ps(m_savedPS);
}
if (m_txEnableValid) {
digitalWrite(m_txEnablePin, LOW);
}
return size;
}
void SoftwareSerial::flush() {
if (!m_rxValid) { return; }
m_buffer->flush();
if (m_parityBuffer)
{
m_parityInPos = m_parityOutPos = 1;
m_parityBuffer->flush();
}
}
bool SoftwareSerial::overflow() {
bool res = m_overflow;
m_overflow = false;
return res;
}
int SoftwareSerial::peek() {
if (!m_rxValid) { return -1; }
if (!m_buffer->available()) {
rxBits();
if (!m_buffer->available()) return -1;
}
auto val = m_buffer->peek();
if (m_parityBuffer) m_lastReadParity = m_parityBuffer->peek() & m_parityOutPos;
return val;
}
void SoftwareSerial::rxBits() {
int isrAvail = m_isrBuffer->available();
#ifdef ESP8266
if (m_isrOverflow.load()) {
m_overflow = true;
m_isrOverflow.store(false);
}
#else
if (m_isrOverflow.exchange(false)) {
m_overflow = true;
}
#endif
// stop bit can go undetected if leading data bits are at same level
// and there was also no next start bit yet, so one byte may be pending.
// low-cost check first
if (!isrAvail && m_rxCurBit >= -1 && m_rxCurBit < m_pduBits - m_stopBits) {
uint32_t detectionCycles = (m_pduBits - m_stopBits - m_rxCurBit) * m_bitCycles;
if (ESP.getCycleCount() - m_isrLastCycle > detectionCycles) {
// Produce faux stop bit level, prevents start bit maldetection
// cycle's LSB is repurposed for the level bit
rxBits(((m_isrLastCycle + detectionCycles) | 1) ^ m_invert);
}
}
m_isrBuffer->for_each([this](const uint32_t& isrCycle) { rxBits(isrCycle); });
}
void SoftwareSerial::rxBits(const uint32_t & isrCycle) {
bool level = (m_isrLastCycle & 1) ^ m_invert;
// error introduced by edge value in LSB of isrCycle is negligible
int32_t cycles = isrCycle - m_isrLastCycle;
m_isrLastCycle = isrCycle;
uint8_t bits = cycles / m_bitCycles;
if (cycles % m_bitCycles > (m_bitCycles >> 1)) ++bits;
while (bits > 0) {
// start bit detection
if (m_rxCurBit >= (m_pduBits - 1)) {
// leading edge of start bit
if (level) break;
m_rxCurBit = -1;
--bits;
continue;
}
// data bits
if (m_rxCurBit >= -1 && m_rxCurBit < (m_dataBits - 1)) {
int8_t dataBits = min(bits, static_cast<uint8_t>(m_dataBits - 1 - m_rxCurBit));
m_rxCurBit += dataBits;
bits -= dataBits;
m_rxCurByte >>= dataBits;
if (level) { m_rxCurByte |= (BYTE_ALL_BITS_SET << (8 - dataBits)); }
continue;
}
// parity bit
if (m_parityMode && m_rxCurBit == (m_dataBits - 1)) {
++m_rxCurBit;
--bits;
m_rxCurParity = level;
continue;
}
// stop bits
if (m_rxCurBit < (m_pduBits - m_stopBits - 1)) {
++m_rxCurBit;
--bits;
continue;
}
if (m_rxCurBit == (m_pduBits - m_stopBits - 1)) {
// Store the received value in the buffer unless we have an overflow
// if not high stop bit level, discard word
if (level)
{
m_rxCurByte >>= (sizeof(uint8_t) * 8 - m_dataBits);
if (!m_buffer->push(m_rxCurByte)) {
m_overflow = true;
}
else {
if (m_parityBuffer)
{
if (m_rxCurParity) {
m_parityBuffer->pushpeek() |= m_parityInPos;
}
else {
m_parityBuffer->pushpeek() &= ~m_parityInPos;
}
m_parityInPos <<= 1;
if (!m_parityInPos)
{
m_parityBuffer->push();
m_parityInPos = 1;
}
}
}
}
m_rxCurBit = m_pduBits;
// reset to 0 is important for masked bit logic
m_rxCurByte = 0;
m_rxCurParity = false;
break;
}
break;
}
}
void ICACHE_RAM_ATTR SoftwareSerial::rxBitISR(SoftwareSerial * self) {
uint32_t curCycle = ESP.getCycleCount();
bool level = digitalRead(self->m_rxPin);
// Store level and cycle in the buffer unless we have an overflow
// cycle's LSB is repurposed for the level bit
if (!self->m_isrBuffer->push((curCycle | 1U) ^ !level)) self->m_isrOverflow.store(true);
}
void ICACHE_RAM_ATTR SoftwareSerial::rxBitSyncISR(SoftwareSerial * self) {
uint32_t start = ESP.getCycleCount();
uint32_t wait = self->m_bitCycles - 172U;
bool level = self->m_invert;
// Store level and cycle in the buffer unless we have an overflow
// cycle's LSB is repurposed for the level bit
if (!self->m_isrBuffer->push(((start + wait) | 1U) ^ !level)) self->m_isrOverflow.store(true);
for (uint32_t i = 0; i < self->m_pduBits; ++i) {
while (ESP.getCycleCount() - start < wait) {};
wait += self->m_bitCycles;
// Store level and cycle in the buffer unless we have an overflow
// cycle's LSB is repurposed for the level bit
if (digitalRead(self->m_rxPin) != level)
{
if (!self->m_isrBuffer->push(((start + wait) | 1U) ^ level)) self->m_isrOverflow.store(true);
level = !level;
}
}
}
void SoftwareSerial::onReceive(Delegate<void(int available), void*> handler) {
receiveHandler = handler;
}
void SoftwareSerial::perform_work() {
if (!m_rxValid) { return; }
rxBits();
if (receiveHandler) {
int avail = m_buffer->available();
if (avail) { receiveHandler(avail); }
}
}

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/*
SoftwareSerial.h
SoftwareSerial.cpp - Implementation of the Arduino software serial for ESP8266/ESP32.
Copyright (c) 2015-2016 Peter Lerup. All rights reserved.
Copyright (c) 2018-2019 Dirk O. Kaar. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __SoftwareSerial_h
#define __SoftwareSerial_h
#include "circular_queue/circular_queue.h"
#include <Stream.h>
enum SoftwareSerialParity : uint8_t {
SWSERIAL_PARITY_NONE = 000,
SWSERIAL_PARITY_EVEN = 020,
SWSERIAL_PARITY_ODD = 030,
SWSERIAL_PARITY_MARK = 040,
SWSERIAL_PARITY_SPACE = 070,
};
enum SoftwareSerialConfig {
SWSERIAL_5N1 = SWSERIAL_PARITY_NONE,
SWSERIAL_6N1,
SWSERIAL_7N1,
SWSERIAL_8N1,
SWSERIAL_5E1 = SWSERIAL_PARITY_EVEN,
SWSERIAL_6E1,
SWSERIAL_7E1,
SWSERIAL_8E1,
SWSERIAL_5O1 = SWSERIAL_PARITY_ODD,
SWSERIAL_6O1,
SWSERIAL_7O1,
SWSERIAL_8O1,
SWSERIAL_5M1 = SWSERIAL_PARITY_MARK,
SWSERIAL_6M1,
SWSERIAL_7M1,
SWSERIAL_8M1,
SWSERIAL_5S1 = SWSERIAL_PARITY_SPACE,
SWSERIAL_6S1,
SWSERIAL_7S1,
SWSERIAL_8S1,
SWSERIAL_5N2 = 0200 | SWSERIAL_PARITY_NONE,
SWSERIAL_6N2,
SWSERIAL_7N2,
SWSERIAL_8N2,
SWSERIAL_5E2 = 0200 | SWSERIAL_PARITY_EVEN,
SWSERIAL_6E2,
SWSERIAL_7E2,
SWSERIAL_8E2,
SWSERIAL_5O2 = 0200 | SWSERIAL_PARITY_ODD,
SWSERIAL_6O2,
SWSERIAL_7O2,
SWSERIAL_8O2,
SWSERIAL_5M2 = 0200 | SWSERIAL_PARITY_MARK,
SWSERIAL_6M2,
SWSERIAL_7M2,
SWSERIAL_8M2,
SWSERIAL_5S2 = 0200 | SWSERIAL_PARITY_SPACE,
SWSERIAL_6S2,
SWSERIAL_7S2,
SWSERIAL_8S2,
};
/// This class is compatible with the corresponding AVR one, however,
/// the constructor takes no arguments, for compatibility with the
/// HardwareSerial class.
/// Instead, the begin() function handles pin assignments and logic inversion.
/// It also has optional input buffer capacity arguments for byte buffer and ISR bit buffer.
/// Bitrates up to at least 115200 can be used.
class SoftwareSerial : public Stream {
public:
SoftwareSerial();
/// Ctor to set defaults for pins.
/// @param rxPin the GPIO pin used for RX
/// @param txPin -1 for onewire protocol, GPIO pin used for twowire TX
SoftwareSerial(int8_t rxPin, int8_t txPin = -1, bool invert = false);
SoftwareSerial(const SoftwareSerial&) = delete;
SoftwareSerial& operator= (const SoftwareSerial&) = delete;
virtual ~SoftwareSerial();
/// Configure the SoftwareSerial object for use.
/// @param baud the TX/RX bitrate
/// @param config sets databits, parity, and stop bit count
/// @param rxPin -1 or default: either no RX pin, or keeps the rxPin set in the ctor
/// @param txPin -1 or default: either no TX pin (onewire), or keeps the txPin set in the ctor
/// @param invert true: uses invert line level logic
/// @param bufCapacity the capacity for the received bytes buffer
/// @param isrBufCapacity 0: derived from bufCapacity. The capacity of the internal asynchronous
/// bit receive buffer, a suggested size is bufCapacity times the sum of
/// start, data, parity and stop bit count.
void begin(uint32_t baud, SoftwareSerialConfig config,
int8_t rxPin, int8_t txPin, bool invert,
int bufCapacity = 64, int isrBufCapacity = 0);
void begin(uint32_t baud, SoftwareSerialConfig config,
int8_t rxPin, int8_t txPin) {
begin(baud, config, rxPin, txPin, m_invert);
}
void begin(uint32_t baud, SoftwareSerialConfig config,
int8_t rxPin) {
begin(baud, config, rxPin, m_txPin, m_invert);
}
void begin(uint32_t baud, SoftwareSerialConfig config = SWSERIAL_8N1) {
begin(baud, config, m_rxPin, m_txPin, m_invert);
}
uint32_t baudRate();
/// Transmit control pin.
void setTransmitEnablePin(int8_t txEnablePin);
/// Enable or disable interrupts during tx.
void enableIntTx(bool on);
bool overflow();
int available() override;
int availableForWrite() {
if (!m_txValid) return 0;
return 1;
}
int peek() override;
int read() override;
/// @returns The verbatim parity bit associated with the last read() or peek() call
bool readParity()
{
return m_lastReadParity;
}
/// @returns The calculated bit for even parity of the parameter byte
static bool parityEven(uint8_t byte) {
byte ^= byte >> 4;
byte &= 0xf;
return (0x6996 >> byte) & 1;
}
/// @returns The calculated bit for odd parity of the parameter byte
static bool parityOdd(uint8_t byte) {
byte ^= byte >> 4;
byte &= 0xf;
return (0x9669 >> byte) & 1;
}
/// The read(buffer, size) functions are non-blocking, the same as readBytes but without timeout
size_t read(uint8_t* buffer, size_t size);
/// The read(buffer, size) functions are non-blocking, the same as readBytes but without timeout
size_t read(char* buffer, size_t size) {
return read(reinterpret_cast<uint8_t*>(buffer), size);
}
/// @returns The number of bytes read into buffer, up to size. Times out if the limit set through
/// Stream::setTimeout() is reached.
size_t readBytes(uint8_t* buffer, size_t size) override;
/// @returns The number of bytes read into buffer, up to size. Times out if the limit set through
/// Stream::setTimeout() is reached.
size_t readBytes(char* buffer, size_t size) override {
return readBytes(reinterpret_cast<uint8_t*>(buffer), size);
}
void flush() override;
size_t write(uint8_t byte) override;
size_t write(uint8_t byte, SoftwareSerialParity parity);
size_t write(const uint8_t* buffer, size_t size) override;
size_t write(const char* buffer, size_t size) {
return write(reinterpret_cast<const uint8_t*>(buffer), size);
}
size_t write(const uint8_t* buffer, size_t size, SoftwareSerialParity parity);
size_t write(const char* buffer, size_t size, SoftwareSerialParity parity) {
return write(reinterpret_cast<const uint8_t*>(buffer), size, parity);
}
operator bool() const { return m_rxValid || m_txValid; }
/// Disable or enable interrupts on the rx pin.
void enableRx(bool on);
/// One wire control.
void enableTx(bool on);
// AVR compatibility methods.
bool listen() { enableRx(true); return true; }
void end();
bool isListening() { return m_rxEnabled; }
bool stopListening() { enableRx(false); return true; }
/// Set an event handler for received data.
void onReceive(Delegate<void(int available), void*> handler);
/// Run the internal processing and event engine. Can be iteratively called
/// from loop, or otherwise scheduled.
void perform_work();
using Print::write;
private:
// If sync is false, it's legal to exceed the deadline, for instance,
// by enabling interrupts.
void preciseDelay(bool sync);
// If withStopBit is set, either cycle contains a stop bit.
// If dutyCycle == 0, the level is not forced to HIGH.
// If offCycle == 0, the level remains unchanged from dutyCycle.
void writePeriod(
uint32_t dutyCycle, uint32_t offCycle, bool withStopBit);
bool isValidGPIOpin(int8_t pin);
/* check m_rxValid that calling is safe */
void rxBits();
void rxBits(const uint32_t& isrCycle);
static void rxBitISR(SoftwareSerial* self);
static void rxBitSyncISR(SoftwareSerial* self);
// Member variables
int8_t m_rxPin = -1;
int8_t m_txPin = -1;
int8_t m_txEnablePin = -1;
uint8_t m_dataBits;
bool m_oneWire;
bool m_rxValid = false;
bool m_rxEnabled = false;
bool m_txValid = false;
bool m_txEnableValid = false;
bool m_invert;
/// PDU bits include data, parity and stop bits; the start bit is not counted.
uint8_t m_pduBits;
bool m_intTxEnabled;
SoftwareSerialParity m_parityMode;
uint8_t m_stopBits;
bool m_lastReadParity;
bool m_overflow = false;
uint32_t m_bitCycles;
uint8_t m_parityInPos;
uint8_t m_parityOutPos;
int8_t m_rxCurBit; // 0 thru (m_pduBits - m_stopBits - 1): data/parity bits. -1: start bit. (m_pduBits - 1): stop bit.
uint8_t m_rxCurByte = 0;
std::unique_ptr<circular_queue<uint8_t> > m_buffer;
std::unique_ptr<circular_queue<uint8_t> > m_parityBuffer;
uint32_t m_periodStart;
uint32_t m_periodDuration;
uint32_t m_savedPS = 0;
// the ISR stores the relative bit times in the buffer. The inversion corrected level is used as sign bit (2's complement):
// 1 = positive including 0, 0 = negative.
std::unique_ptr<circular_queue<uint32_t> > m_isrBuffer;
std::atomic<bool> m_isrOverflow;
uint32_t m_isrLastCycle;
bool m_rxCurParity = false;
Delegate<void(int available), void*> receiveHandler;
};
#endif // __SoftwareSerial_h

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/*
MultiDelegate.h - A queue or event multiplexer based on the efficient Delegate
class
Copyright (c) 2019 Dirk O. Kaar. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __MULTIDELEGATE_H
#define __MULTIDELEGATE_H
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
#include <atomic>
#else
#include "circular_queue/ghostl.h"
#endif
#if defined(ESP8266)
#include <interrupts.h>
using esp8266::InterruptLock;
#elif defined(ARDUINO)
class InterruptLock {
public:
InterruptLock() {
noInterrupts();
}
~InterruptLock() {
interrupts();
}
};
#else
#include <mutex>
#endif
namespace detail
{
namespace
{
template< typename Delegate, typename R, bool ISQUEUE = false, typename... P>
struct CallP
{
static R execute(Delegate& del, P... args)
{
return del(std::forward<P...>(args...)) ? !ISQUEUE : ISQUEUE;
}
};
template< typename Delegate, bool ISQUEUE, typename... P>
struct CallP<Delegate, void, ISQUEUE, P...>
{
static bool execute(Delegate& del, P... args)
{
del(std::forward<P...>(args...));
return !ISQUEUE;
}
};
template< typename Delegate, typename R, bool ISQUEUE = false>
struct Call
{
static R execute(Delegate& del)
{
return del() ? !ISQUEUE : ISQUEUE;
}
};
template< typename Delegate, bool ISQUEUE>
struct Call<Delegate, void, ISQUEUE>
{
static bool execute(Delegate& del)
{
del();
return !ISQUEUE;
}
};
};
template< typename Delegate, typename R = void, bool ISQUEUE = false, uint32_t QUEUE_CAPACITY = 32, typename... P>
class MultiDelegatePImpl
{
public:
MultiDelegatePImpl() = default;
~MultiDelegatePImpl()
{
*this = nullptr;
}
MultiDelegatePImpl(const MultiDelegatePImpl&) = delete;
MultiDelegatePImpl& operator=(const MultiDelegatePImpl&) = delete;
MultiDelegatePImpl(MultiDelegatePImpl&& md)
{
first = md.first;
last = md.last;
unused = md.unused;
nodeCount = md.nodeCount;
md.first = nullptr;
md.last = nullptr;
md.unused = nullptr;
md.nodeCount = 0;
}
MultiDelegatePImpl(const Delegate& del)
{
add(del);
}
MultiDelegatePImpl(Delegate&& del)
{
add(std::move(del));
}
MultiDelegatePImpl& operator=(MultiDelegatePImpl&& md)
{
first = md.first;
last = md.last;
unused = md.unused;
nodeCount = md.nodeCount;
md.first = nullptr;
md.last = nullptr;
md.unused = nullptr;
md.nodeCount = 0;
return *this;
}
MultiDelegatePImpl& operator=(std::nullptr_t)
{
if (last)
last->mNext = unused;
if (first)
unused = first;
while (unused)
{
auto to_delete = unused;
unused = unused->mNext;
delete(to_delete);
}
return *this;
}
MultiDelegatePImpl& operator+=(const Delegate& del)
{
add(del);
return *this;
}
MultiDelegatePImpl& operator+=(Delegate&& del)
{
add(std::move(del));
return *this;
}
protected:
struct Node_t
{
~Node_t()
{
mDelegate = nullptr; // special overload in Delegate
}
Node_t* mNext = nullptr;
Delegate mDelegate;
};
Node_t* first = nullptr;
Node_t* last = nullptr;
Node_t* unused = nullptr;
uint32_t nodeCount = 0;
// Returns a pointer to an unused Node_t,
// or if none are available allocates a new one,
// or nullptr if limit is reached
Node_t* IRAM_ATTR get_node_unsafe()
{
Node_t* result = nullptr;
// try to get an item from unused items list
if (unused)
{
result = unused;
unused = unused->mNext;
}
// if no unused items, and count not too high, allocate a new one
else if (nodeCount < QUEUE_CAPACITY)
{
#if defined(ESP8266) || defined(ESP32)
result = new (std::nothrow) Node_t;
#else
result = new Node_t;
#endif
if (result)
++nodeCount;
}
return result;
}
void recycle_node_unsafe(Node_t* node)
{
node->mDelegate = nullptr; // special overload in Delegate
node->mNext = unused;
unused = node;
}
#ifndef ARDUINO
std::mutex mutex_unused;
#endif
public:
const Delegate* IRAM_ATTR add(const Delegate& del)
{
return add(Delegate(del));
}
const Delegate* IRAM_ATTR add(Delegate&& del)
{
if (!del)
return nullptr;
#ifdef ARDUINO
InterruptLock lockAllInterruptsInThisScope;
#else
std::lock_guard<std::mutex> lock(mutex_unused);
#endif
Node_t* item = ISQUEUE ? get_node_unsafe() :
#if defined(ESP8266) || defined(ESP32)
new (std::nothrow) Node_t;
#else
new Node_t;
#endif
if (!item)
return nullptr;
item->mDelegate = std::move(del);
item->mNext = nullptr;
if (last)
last->mNext = item;
else
first = item;
last = item;
return &item->mDelegate;
}
bool remove(const Delegate* del)
{
auto current = first;
if (!current)
return false;
Node_t* prev = nullptr;
do
{
if (del == &current->mDelegate)
{
// remove callback from stack
#ifdef ARDUINO
InterruptLock lockAllInterruptsInThisScope;
#else
std::lock_guard<std::mutex> lock(mutex_unused);
#endif
auto to_recycle = current;
// removing rLast
if (last == current)
last = prev;
current = current->mNext;
if (prev)
{
prev->mNext = current;
}
else
{
first = current;
}
if (ISQUEUE)
recycle_node_unsafe(to_recycle);
else
delete to_recycle;
return true;
}
else
{
prev = current;
current = current->mNext;
}
} while (current);
return false;
}
void operator()(P... args)
{
auto current = first;
if (!current)
return;
static std::atomic<bool> fence(false);
// prevent recursive calls
#if defined(ARDUINO) && !defined(ESP32)
if (fence.load()) return;
fence.store(true);
#else
if (fence.exchange(true)) return;
#endif
Node_t* prev = nullptr;
// prevent execution of new callbacks during this run
auto stop = last;
bool done;
do
{
done = current == stop;
if (!CallP<Delegate, R, ISQUEUE, P...>::execute(current->mDelegate, args...))
{
// remove callback from stack
#ifdef ARDUINO
InterruptLock lockAllInterruptsInThisScope;
#else
std::lock_guard<std::mutex> lock(mutex_unused);
#endif
auto to_recycle = current;
// removing rLast
if (last == current)
last = prev;
current = current->mNext;
if (prev)
{
prev->mNext = current;
}
else
{
first = current;
}
if (ISQUEUE)
recycle_node_unsafe(to_recycle);
else
delete to_recycle;
}
else
{
prev = current;
current = current->mNext;
}
#if defined(ESP8266) || defined(ESP32)
// running callbacks might last too long for watchdog etc.
optimistic_yield(10000);
#endif
} while (current && !done);
fence.store(false);
}
};
template< typename Delegate, typename R = void, bool ISQUEUE = false, uint32_t QUEUE_CAPACITY = 32>
class MultiDelegateImpl : public MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>
{
protected:
using typename MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::Node_t;
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::first;
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::last;
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::unused;
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::nodeCount;
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::recycle_node_unsafe;
#ifndef ARDUINO
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::mutex_unused;
#endif
public:
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::MultiDelegatePImpl;
void operator()()
{
auto current = first;
if (!current)
return;
static std::atomic<bool> fence(false);
// prevent recursive calls
#if defined(ARDUINO) && !defined(ESP32)
if (fence.load()) return;
fence.store(true);
#else
if (fence.exchange(true)) return;
#endif
Node_t* prev = nullptr;
// prevent execution of new callbacks during this run
auto stop = last;
bool done;
do
{
done = current == stop;
if (!Call<Delegate, R, ISQUEUE>::execute(current->mDelegate))
{
// remove callback from stack
#ifdef ARDUINO
InterruptLock lockAllInterruptsInThisScope;
#else
std::lock_guard<std::mutex> lock(mutex_unused);
#endif
auto to_recycle = current;
// removing rLast
if (last == current)
last = prev;
current = current->mNext;
if (prev)
{
prev->mNext = current;
}
else
{
first = current;
}
if (ISQUEUE)
recycle_node_unsafe(to_recycle);
else
delete to_recycle;
}
else
{
prev = current;
current = current->mNext;
}
#if defined(ESP8266) || defined(ESP32)
// running callbacks might last too long for watchdog etc.
optimistic_yield(10000);
#endif
} while (current && !done);
fence.store(false);
}
};
template< typename Delegate, typename R, bool ISQUEUE, uint32_t QUEUE_CAPACITY, typename... P> class MultiDelegate;
template< typename Delegate, typename R, bool ISQUEUE, uint32_t QUEUE_CAPACITY, typename... P>
class MultiDelegate<Delegate, R(P...), ISQUEUE, QUEUE_CAPACITY> : public MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY, P...>
{
public:
using MultiDelegatePImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY, P...>::MultiDelegatePImpl;
};
template< typename Delegate, typename R, bool ISQUEUE, uint32_t QUEUE_CAPACITY>
class MultiDelegate<Delegate, R(), ISQUEUE, QUEUE_CAPACITY> : public MultiDelegateImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>
{
public:
using MultiDelegateImpl<Delegate, R, ISQUEUE, QUEUE_CAPACITY>::MultiDelegateImpl;
};
};
/**
The MultiDelegate class template can be specialized to either a queue or an event multiplexer.
It is designed to be used with Delegate, the efficient runtime wrapper for C function ptr and C++ std::function.
@tparam Delegate specifies the concrete type that MultiDelegate bases the queue or event multiplexer on.
@tparam ISQUEUE modifies the generated MultiDelegate class in subtle ways. In queue mode (ISQUEUE == true),
the value of QUEUE_CAPACITY enforces the maximum number of simultaneous items the queue can contain.
This is exploited to minimize the use of new and delete by reusing already allocated items, thus
reducing heap fragmentation. In event multiplexer mode (ISQUEUE = false), new and delete are
used for allocation of the event handler items.
If the result type of the function call operator of Delegate is void, calling a MultiDelegate queue
removes each item after calling it; a Multidelegate event multiplexer keeps event handlers until
explicitly removed.
If the result type of the function call operator of Delegate is non-void, the type-conversion to bool
of that result determines if the item is immediately removed or kept after each call: a Multidelegate
queue removes an item only if true is returned, but a Multidelegate event multiplexer removes event
handlers that return false.
@tparam QUEUE_CAPACITY is only used if ISQUEUE == true. Then, it sets the maximum capacity that the queue dynamically
allocates from the heap. Unused items are not returned to the heap, but are managed by the MultiDelegate
instance during its own lifetime for efficiency.
*/
template< typename Delegate, bool ISQUEUE = false, uint32_t QUEUE_CAPACITY = 32>
class MultiDelegate : public detail::MultiDelegate<Delegate, typename Delegate::target_type, ISQUEUE, QUEUE_CAPACITY>
{
public:
using detail::MultiDelegate<Delegate, typename Delegate::target_type, ISQUEUE, QUEUE_CAPACITY>::MultiDelegate;
};
#endif // __MULTIDELEGATE_H

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/*
circular_queue.h - Implementation of a lock-free circular queue for EspSoftwareSerial.
Copyright (c) 2019 Dirk O. Kaar. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __circular_queue_h
#define __circular_queue_h
#ifdef ARDUINO
#include <Arduino.h>
#endif
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
#include <atomic>
#include <memory>
#include <algorithm>
#include "Delegate.h"
using std::min;
#else
#include "ghostl.h"
#endif
#if !defined(ESP32) && !defined(ESP8266)
#define ICACHE_RAM_ATTR
#define IRAM_ATTR
#endif
/*!
@brief Instance class for a single-producer, single-consumer circular queue / ring buffer (FIFO).
This implementation is lock-free between producer and consumer for the available(), peek(),
pop(), and push() type functions.
*/
template< typename T, typename ForEachArg = void >
class circular_queue
{
public:
/*!
@brief Constructs a valid, but zero-capacity dummy queue.
*/
circular_queue() : m_bufSize(1)
{
m_inPos.store(0);
m_outPos.store(0);
}
/*!
@brief Constructs a queue of the given maximum capacity.
*/
circular_queue(const size_t capacity) : m_bufSize(capacity + 1), m_buffer(new T[m_bufSize])
{
m_inPos.store(0);
m_outPos.store(0);
}
circular_queue(circular_queue&& cq) :
m_bufSize(cq.m_bufSize), m_buffer(cq.m_buffer), m_inPos(cq.m_inPos.load()), m_outPos(cq.m_outPos.load())
{}
~circular_queue()
{
m_buffer.reset();
}
circular_queue(const circular_queue&) = delete;
circular_queue& operator=(circular_queue&& cq)
{
m_bufSize = cq.m_bufSize;
m_buffer = cq.m_buffer;
m_inPos.store(cq.m_inPos.load());
m_outPos.store(cq.m_outPos.load());
}
circular_queue& operator=(const circular_queue&) = delete;
/*!
@brief Get the numer of elements the queue can hold at most.
*/
size_t capacity() const
{
return m_bufSize - 1;
}
/*!
@brief Resize the queue. The available elements in the queue are preserved.
This is not lock-free and concurrent producer or consumer access
will lead to corruption.
@return True if the new capacity could accommodate the present elements in
the queue, otherwise nothing is done and false is returned.
*/
bool capacity(const size_t cap);
/*!
@brief Discard all data in the queue.
*/
void flush()
{
m_outPos.store(m_inPos.load());
}
/*!
@brief Get a snapshot number of elements that can be retrieved by pop.
*/
size_t available() const
{
int avail = static_cast<int>(m_inPos.load() - m_outPos.load());
if (avail < 0) avail += m_bufSize;
return avail;
}
/*!
@brief Get the remaining free elementes for pushing.
*/
size_t available_for_push() const
{
int avail = static_cast<int>(m_outPos.load() - m_inPos.load()) - 1;
if (avail < 0) avail += m_bufSize;
return avail;
}
/*!
@brief Peek at the next element pop will return without removing it from the queue.
@return An rvalue copy of the next element that can be popped. If the queue is empty,
return an rvalue copy of the element that is pending the next push.
*/
T peek() const
{
const auto outPos = m_outPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
return m_buffer[outPos];
}
/*!
@brief Peek at the next pending input value.
@return A reference to the next element that can be pushed.
*/
T& IRAM_ATTR pushpeek()
{
const auto inPos = m_inPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
return m_buffer[inPos];
}
/*!
@brief Release the next pending input value, accessible by pushpeek(), into the queue.
@return true if the queue accepted the value, false if the queue
was full.
*/
bool IRAM_ATTR push();
/*!
@brief Move the rvalue parameter into the queue.
@return true if the queue accepted the value, false if the queue
was full.
*/
bool IRAM_ATTR push(T&& val);
/*!
@brief Push a copy of the parameter into the queue.
@return true if the queue accepted the value, false if the queue
was full.
*/
bool IRAM_ATTR push(const T& val)
{
return push(T(val));
}
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
/*!
@brief Push copies of multiple elements from a buffer into the queue,
in order, beginning at buffer's head.
@return The number of elements actually copied into the queue, counted
from the buffer head.
*/
size_t push_n(const T* buffer, size_t size);
#endif
/*!
@brief Pop the next available element from the queue.
@return An rvalue copy of the popped element, or a default
value of type T if the queue is empty.
*/
T pop();
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
/*!
@brief Pop multiple elements in ordered sequence from the queue to a buffer.
If buffer is nullptr, simply discards up to size elements from the queue.
@return The number of elements actually popped from the queue to
buffer.
*/
size_t pop_n(T* buffer, size_t size);
#endif
/*!
@brief Iterate over and remove each available element from queue,
calling back fun with an rvalue reference of every single element.
*/
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
void for_each(const Delegate<void(T&&), ForEachArg>& fun);
#else
void for_each(Delegate<void(T&&), ForEachArg> fun);
#endif
/*!
@brief In reverse order, iterate over, pop and optionally requeue each available element from the queue,
calling back fun with a reference of every single element.
Requeuing is dependent on the return boolean of the callback function. If it
returns true, the requeue occurs.
*/
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
bool for_each_rev_requeue(const Delegate<bool(T&), ForEachArg>& fun);
#else
bool for_each_rev_requeue(Delegate<bool(T&), ForEachArg> fun);
#endif
protected:
const T defaultValue = {};
unsigned m_bufSize;
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
std::unique_ptr<T[]> m_buffer;
#else
std::unique_ptr<T> m_buffer;
#endif
std::atomic<unsigned> m_inPos;
std::atomic<unsigned> m_outPos;
};
template< typename T, typename ForEachArg >
bool circular_queue<T, ForEachArg>::capacity(const size_t cap)
{
if (cap + 1 == m_bufSize) return true;
else if (available() > cap) return false;
std::unique_ptr<T[] > buffer(new T[cap + 1]);
const auto available = pop_n(buffer, cap);
m_buffer.reset(buffer);
m_bufSize = cap + 1;
std::atomic_thread_fence(std::memory_order_release);
m_inPos.store(available, std::memory_order_relaxed);
m_outPos.store(0, std::memory_order_release);
return true;
}
template< typename T, typename ForEachArg >
bool IRAM_ATTR circular_queue<T, ForEachArg>::push()
{
const auto inPos = m_inPos.load(std::memory_order_acquire);
const unsigned next = (inPos + 1) % m_bufSize;
if (next == m_outPos.load(std::memory_order_relaxed)) {
return false;
}
std::atomic_thread_fence(std::memory_order_acquire);
m_inPos.store(next, std::memory_order_release);
return true;
}
template< typename T, typename ForEachArg >
bool IRAM_ATTR circular_queue<T, ForEachArg>::push(T&& val)
{
const auto inPos = m_inPos.load(std::memory_order_acquire);
const unsigned next = (inPos + 1) % m_bufSize;
if (next == m_outPos.load(std::memory_order_relaxed)) {
return false;
}
std::atomic_thread_fence(std::memory_order_acquire);
m_buffer[inPos] = std::move(val);
std::atomic_thread_fence(std::memory_order_release);
m_inPos.store(next, std::memory_order_release);
return true;
}
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
template< typename T, typename ForEachArg >
size_t circular_queue<T, ForEachArg>::push_n(const T* buffer, size_t size)
{
const auto inPos = m_inPos.load(std::memory_order_acquire);
const auto outPos = m_outPos.load(std::memory_order_relaxed);
size_t blockSize = (outPos > inPos) ? outPos - 1 - inPos : (outPos == 0) ? m_bufSize - 1 - inPos : m_bufSize - inPos;
blockSize = min(size, blockSize);
if (!blockSize) return 0;
int next = (inPos + blockSize) % m_bufSize;
std::atomic_thread_fence(std::memory_order_acquire);
auto dest = m_buffer.get() + inPos;
std::copy_n(std::make_move_iterator(buffer), blockSize, dest);
size = min(size - blockSize, outPos > 1 ? static_cast<size_t>(outPos - next - 1) : 0);
next += size;
dest = m_buffer.get();
std::copy_n(std::make_move_iterator(buffer + blockSize), size, dest);
std::atomic_thread_fence(std::memory_order_release);
m_inPos.store(next, std::memory_order_release);
return blockSize + size;
}
#endif
template< typename T, typename ForEachArg >
T circular_queue<T, ForEachArg>::pop()
{
const auto outPos = m_outPos.load(std::memory_order_acquire);
if (m_inPos.load(std::memory_order_relaxed) == outPos) return defaultValue;
std::atomic_thread_fence(std::memory_order_acquire);
auto val = std::move(m_buffer[outPos]);
std::atomic_thread_fence(std::memory_order_release);
m_outPos.store((outPos + 1) % m_bufSize, std::memory_order_release);
return val;
}
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
template< typename T, typename ForEachArg >
size_t circular_queue<T, ForEachArg>::pop_n(T* buffer, size_t size) {
size_t avail = size = min(size, available());
if (!avail) return 0;
const auto outPos = m_outPos.load(std::memory_order_acquire);
size_t n = min(avail, static_cast<size_t>(m_bufSize - outPos));
std::atomic_thread_fence(std::memory_order_acquire);
if (buffer) {
buffer = std::copy_n(std::make_move_iterator(m_buffer.get() + outPos), n, buffer);
avail -= n;
std::copy_n(std::make_move_iterator(m_buffer.get()), avail, buffer);
}
std::atomic_thread_fence(std::memory_order_release);
m_outPos.store((outPos + size) % m_bufSize, std::memory_order_release);
return size;
}
#endif
template< typename T, typename ForEachArg >
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
void circular_queue<T, ForEachArg>::for_each(const Delegate<void(T&&), ForEachArg>& fun)
#else
void circular_queue<T, ForEachArg>::for_each(Delegate<void(T&&), ForEachArg> fun)
#endif
{
auto outPos = m_outPos.load(std::memory_order_acquire);
const auto inPos = m_inPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
while (outPos != inPos)
{
fun(std::move(m_buffer[outPos]));
std::atomic_thread_fence(std::memory_order_release);
outPos = (outPos + 1) % m_bufSize;
m_outPos.store(outPos, std::memory_order_release);
}
}
template< typename T, typename ForEachArg >
#if defined(ESP8266) || defined(ESP32) || !defined(ARDUINO)
bool circular_queue<T, ForEachArg>::for_each_rev_requeue(const Delegate<bool(T&), ForEachArg>& fun)
#else
bool circular_queue<T, ForEachArg>::for_each_rev_requeue(Delegate<bool(T&), ForEachArg> fun)
#endif
{
auto inPos0 = circular_queue<T, ForEachArg>::m_inPos.load(std::memory_order_acquire);
auto outPos = circular_queue<T, ForEachArg>::m_outPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
if (outPos == inPos0) return false;
auto pos = inPos0;
auto outPos1 = inPos0;
const auto posDecr = circular_queue<T, ForEachArg>::m_bufSize - 1;
do {
pos = (pos + posDecr) % circular_queue<T, ForEachArg>::m_bufSize;
T&& val = std::move(circular_queue<T, ForEachArg>::m_buffer[pos]);
if (fun(val))
{
outPos1 = (outPos1 + posDecr) % circular_queue<T, ForEachArg>::m_bufSize;
if (outPos1 != pos) circular_queue<T, ForEachArg>::m_buffer[outPos1] = std::move(val);
}
} while (pos != outPos);
circular_queue<T, ForEachArg>::m_outPos.store(outPos1, std::memory_order_release);
return true;
}
#endif // __circular_queue_h

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/*
circular_queue_mp.h - Implementation of a lock-free circular queue for EspSoftwareSerial.
Copyright (c) 2019 Dirk O. Kaar. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __circular_queue_mp_h
#define __circular_queue_mp_h
#include "circular_queue.h"
#ifdef ESP8266
#include "interrupts.h"
#else
#include <mutex>
#endif
/*!
@brief Instance class for a multi-producer, single-consumer circular queue / ring buffer (FIFO).
This implementation is lock-free between producers and consumer for the available(), peek(),
pop(), and push() type functions, but is guarded to safely allow only a single producer
at any instant.
*/
template< typename T, typename ForEachArg = void >
class circular_queue_mp : protected circular_queue<T, ForEachArg>
{
public:
circular_queue_mp() = default;
circular_queue_mp(const size_t capacity) : circular_queue<T, ForEachArg>(capacity)
{}
circular_queue_mp(circular_queue<T, ForEachArg>&& cq) : circular_queue<T, ForEachArg>(std::move(cq))
{}
using circular_queue<T, ForEachArg>::operator=;
using circular_queue<T, ForEachArg>::capacity;
using circular_queue<T, ForEachArg>::flush;
using circular_queue<T, ForEachArg>::available;
using circular_queue<T, ForEachArg>::available_for_push;
using circular_queue<T, ForEachArg>::peek;
using circular_queue<T, ForEachArg>::pop;
using circular_queue<T, ForEachArg>::pop_n;
using circular_queue<T, ForEachArg>::for_each;
using circular_queue<T, ForEachArg>::for_each_rev_requeue;
/*!
@brief Resize the queue. The available elements in the queue are preserved.
This is not lock-free, but safe, concurrent producer or consumer access
is guarded.
@return True if the new capacity could accommodate the present elements in
the queue, otherwise nothing is done and false is returned.
*/
bool capacity(const size_t cap)
{
#ifdef ESP8266
esp8266::InterruptLock lock;
#else
std::lock_guard<std::mutex> lock(m_pushMtx);
#endif
return circular_queue<T, ForEachArg>::capacity(cap);
}
bool IRAM_ATTR push() = delete;
/*!
@brief Move the rvalue parameter into the queue, guarded
for multiple concurrent producers.
@return true if the queue accepted the value, false if the queue
was full.
*/
bool IRAM_ATTR push(T&& val)
{
#ifdef ESP8266
esp8266::InterruptLock lock;
#else
std::lock_guard<std::mutex> lock(m_pushMtx);
#endif
return circular_queue<T, ForEachArg>::push(std::move(val));
}
/*!
@brief Push a copy of the parameter into the queue, guarded
for multiple concurrent producers.
@return true if the queue accepted the value, false if the queue
was full.
*/
bool IRAM_ATTR push(const T& val)
{
#ifdef ESP8266
esp8266::InterruptLock lock;
#else
std::lock_guard<std::mutex> lock(m_pushMtx);
#endif
return circular_queue<T, ForEachArg>::push(val);
}
/*!
@brief Push copies of multiple elements from a buffer into the queue,
in order, beginning at buffer's head. This is guarded for
multiple producers, push_n() is atomic.
@return The number of elements actually copied into the queue, counted
from the buffer head.
*/
size_t push_n(const T* buffer, size_t size)
{
#ifdef ESP8266
esp8266::InterruptLock lock;
#else
std::lock_guard<std::mutex> lock(m_pushMtx);
#endif
return circular_queue<T, ForEachArg>::push_n(buffer, size);
}
/*!
@brief Pops the next available element from the queue, requeues
it immediately.
@return A reference to the just requeued element, or the default
value of type T if the queue is empty.
*/
T& pop_requeue();
/*!
@brief Iterate over, pop and optionally requeue each available element from the queue,
calling back fun with a reference of every single element.
Requeuing is dependent on the return boolean of the callback function. If it
returns true, the requeue occurs.
*/
bool for_each_requeue(const Delegate<bool(T&), ForEachArg>& fun);
#ifndef ESP8266
protected:
std::mutex m_pushMtx;
#endif
};
template< typename T, typename ForEachArg >
T& circular_queue_mp<T>::pop_requeue()
{
#ifdef ESP8266
esp8266::InterruptLock lock;
#else
std::lock_guard<std::mutex> lock(m_pushMtx);
#endif
const auto outPos = circular_queue<T, ForEachArg>::m_outPos.load(std::memory_order_acquire);
const auto inPos = circular_queue<T, ForEachArg>::m_inPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
if (inPos == outPos) return circular_queue<T, ForEachArg>::defaultValue;
T& val = circular_queue<T, ForEachArg>::m_buffer[inPos] = std::move(circular_queue<T, ForEachArg>::m_buffer[outPos]);
const auto bufSize = circular_queue<T, ForEachArg>::m_bufSize;
std::atomic_thread_fence(std::memory_order_release);
circular_queue<T, ForEachArg>::m_outPos.store((outPos + 1) % bufSize, std::memory_order_relaxed);
circular_queue<T, ForEachArg>::m_inPos.store((inPos + 1) % bufSize, std::memory_order_release);
return val;
}
template< typename T, typename ForEachArg >
bool circular_queue_mp<T>::for_each_requeue(const Delegate<bool(T&), ForEachArg>& fun)
{
auto inPos0 = circular_queue<T, ForEachArg>::m_inPos.load(std::memory_order_acquire);
auto outPos = circular_queue<T, ForEachArg>::m_outPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
if (outPos == inPos0) return false;
do {
T&& val = std::move(circular_queue<T, ForEachArg>::m_buffer[outPos]);
if (fun(val))
{
#ifdef ESP8266
esp8266::InterruptLock lock;
#else
std::lock_guard<std::mutex> lock(m_pushMtx);
#endif
std::atomic_thread_fence(std::memory_order_release);
auto inPos = circular_queue<T, ForEachArg>::m_inPos.load(std::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order_acquire);
circular_queue<T, ForEachArg>::m_buffer[inPos] = std::move(val);
std::atomic_thread_fence(std::memory_order_release);
circular_queue<T, ForEachArg>::m_inPos.store((inPos + 1) % circular_queue<T, ForEachArg>::m_bufSize, std::memory_order_release);
}
else
{
std::atomic_thread_fence(std::memory_order_release);
}
outPos = (outPos + 1) % circular_queue<T, ForEachArg>::m_bufSize;
circular_queue<T, ForEachArg>::m_outPos.store(outPos, std::memory_order_release);
} while (outPos != inPos0);
return true;
}
#endif // __circular_queue_mp_h

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/*
ghostl.h - Implementation of a bare-bones, mostly no-op, C++ STL shell
that allows building some Arduino ESP8266/ESP32
libraries on Aruduino AVR.
Copyright (c) 2019 Dirk O. Kaar. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __ghostl_h
#define __ghostl_h
#if defined(ARDUINO_ARCH_SAMD)
#include <atomic>
#endif
namespace std
{
#if !defined(ARDUINO_ARCH_SAMD)
typedef enum memory_order {
memory_order_relaxed,
memory_order_acquire,
memory_order_release,
memory_order_seq_cst
} memory_order;
template< typename T > class atomic {
private:
T value;
public:
atomic() {}
atomic(T desired) { value = desired; }
void store(T desired, std::memory_order = std::memory_order_seq_cst) volatile noexcept { value = desired; }
T load(std::memory_order = std::memory_order_seq_cst) const volatile noexcept { return value; }
};
inline void atomic_thread_fence(std::memory_order order) noexcept {}
template< typename T > T&& move(T& t) noexcept { return static_cast<T&&>(t); }
#endif
template< typename T, unsigned long N > struct array
{
T _M_elems[N];
decltype(sizeof(0)) size() const { return N; }
T& operator[](decltype(sizeof(0)) i) { return _M_elems[i]; }
const T& operator[](decltype(sizeof(0)) i) const { return _M_elems[i]; }
};
template< typename T > class unique_ptr
{
public:
using pointer = T*;
unique_ptr() noexcept : ptr(nullptr) {}
unique_ptr(pointer p) : ptr(p) {}
pointer operator->() const noexcept { return ptr; }
T& operator[](decltype(sizeof(0)) i) const { return ptr[i]; }
void reset(pointer p = pointer()) noexcept
{
delete ptr;
ptr = p;
}
T& operator*() const { return *ptr; }
private:
pointer ptr;
};
template< typename T > using function = T*;
using nullptr_t = decltype(nullptr);
template<typename T>
struct identity {
typedef T type;
};
template <typename T>
inline T&& forward(typename identity<T>::type& t) noexcept
{
return static_cast<typename identity<T>::type&&>(t);
}
}
#endif // __ghostl_h