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