v1.7.14 (new feature IF482 time telegram complete)

README.md

@@ -50,6 +50,7 @@ Depending on board hardware following features are supported:
 - GPS (Generic serial NMEA, or Quectel L76 I2C)
 - Environmental sensor (Bosch BME680 I2C)
 - Real Time Clock (Maxim DS3231 I2C)
+- IF482 time telegram generator (serial port)
 
 Target platform must be selected in [platformio.ini](https://github.com/cyberman54/ESP32-Paxcounter/blob/master/platformio.ini).<br>
 Hardware dependent settings (pinout etc.) are stored in board files in /hal directory. If you want to use a ESP32 board which is not yet supported, use hal file generic.h and tailor pin mappings to your needs. Pull requests for new boards welcome.<br>

include/globals.h

@@ -140,4 +140,8 @@ extern TaskHandle_t irqHandlerTask, wifiSwitchTask;
 #include "bme680mems.h"
 #endif
 
+#ifdef HAS_IF482
+#include "if482.h"
+#endif
+
 #endif

include/if482.h

@@ -4,7 +4,10 @@
 #include "globals.h"
 #include "irqhandler.h"
 
-void if482_init(void);
+extern TaskHandle_t IF482Task;
-void sendIF482(time_t t);
+
+int if482_init(void);
+void if482_loop(void *pvParameters);
+void IRAM_ATTR IF482IRQ(void);
 
 #endif

include/irqhandler.h

@@ -5,7 +5,6 @@
 #define BUTTON_IRQ 0x02
 #define SENDCOUNTER_IRQ 0x04
 #define CYCLIC_IRQ 0x08
-#define IF482_IRQ 0x10
 
 #include "globals.h"
 #include "cyclic.h"
@@ -26,10 +25,4 @@ void IRAM_ATTR DisplayIRQ();
 void IRAM_ATTR ButtonIRQ();
 #endif
 
-#ifdef HAS_IF482
-#include "if482.h"
-void IRAM_ATTR IF482IRQ();
-#endif
-
-
 #endif

platformio.ini

@@ -6,7 +6,7 @@
 
 ; ---> SELECT TARGET PLATFORM HERE! <---
 [platformio]
-;env_default = generic
+env_default = generic
 ;env_default = ebox
 ;env_default = eboxtube
 ;env_default = heltec
@@ -16,7 +16,7 @@
 ;env_default = ttgov21old
 ;env_default = ttgov21new
 ;env_default = ttgobeam
-env_default = ttgofox
+;env_default = ttgofox
 ;env_default = lopy
 ;env_default = lopy4
 ;env_default = fipy
@@ -30,7 +30,7 @@ description = Paxcounter is a proof-of-concept ESP32 device for metering passeng
 
 [common]
 ; for release_version use max. 10 chars total, use any decimal format like "a.b.c"
-release_version = 1.7.12
+release_version = 1.7.14
 ; DEBUG LEVEL: For production run set to 0, otherwise device will leak RAM while running!
 ; 0=None, 1=Error, 2=Warn, 3=Info, 4=Debug, 5=Verbose
 debug_level = 3
@@ -45,7 +45,7 @@ monitor_speed = 115200
 lib_deps_lora = 
     MCCI LoRaWAN LMIC library@^2.3.1
 lib_deps_display =
-    U8g2@>=2.25.0
+    U8g2@>=2.25.5
 lib_deps_rgbled =
     SmartLeds@>=1.1.3
 lib_deps_gps =

src/hal/ttgofox.h

@@ -25,8 +25,7 @@
 #define RTC_INT GPIO_NUM_34 // interrupt input from rtc
 
 // Settings for IF482 interface
-#define HAS_IF482 9600, SERIAL_7E1, GPIO_NUM_12, GPIO_NUM_15 // IF482 serial port parameters
+//#define HAS_IF482 9600, SERIAL_7E1, GPIO_NUM_12, GPIO_NUM_14 // IF482 serial port parameters
-#define IF482_PORT 1 // serial port 1
 
 // Pins for LORA chip SPI interface, reset line and interrupt lines
 #define LORA_SCK  (5) 

src/if482.cpp

@@ -69,10 +69,12 @@ not evaluated by model BU-190
 // Local logging tag
 static const char TAG[] = "main";
 
-HardwareSerial IF482(1); // use UART #1
+TaskHandle_t IF482Task;
+
+HardwareSerial IF482(2); // use UART #2 (note: #1 may be in use for serial GPS)
 
 // initialize and configure GPS
-void if482_init(void) {
+int if482_init(void) {
 
   // open serial interface
   IF482.begin(HAS_IF482);
@@ -84,6 +86,8 @@ void if482_init(void) {
 
   ESP_LOGI(TAG, "IF482 generator initialized");
 
+  return 1;
+
 } // if482_init
 
 String if482Telegram(time_t t) {
@@ -93,31 +97,64 @@ String if482Telegram(time_t t) {
   char out[17];
 
   switch (timeStatus()) { // indicates if time has been set and recently synced
-
+  case timeSet:           // time is set and is synced
-  case timeSet: // time is set and is synced
     mon = 'A';
     break;
-
   case timeNeedsSync: // time had been set but sync attempt did not succeed
     mon = 'M';
     break;
-
   default: // time not set, no valid time
     mon = '?';
     break;
-
   } // switch
 
   if (!timeNotSet) // do we have valid time?
-    snprintf(buf, sizeof buf, "%02u%02u%02u%1u%02u%02u%02u", year(t)-2000, month(t),
+    snprintf(buf, sizeof buf, "%02u%02u%02u%1u%02u%02u%02u", year(t) - 2000,
-             day(t), weekday(t), hour(t), minute(t), second(t));
+             month(t), day(t), weekday(t), hour(t), minute(t), second(t));
 
   snprintf(out, sizeof out, "O%cL%s\r", mon, buf);
-
   return out;
 }
 
-// interrupt triggered routine
+void if482_loop(void *pvParameters) {
-void sendIF482(time_t t) { IF482.print(if482Telegram(t)); }
+
+  configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
+
+  TickType_t wakeTime;
+  time_t t, tt;
+  const TickType_t shotTime = pdMS_TO_TICKS(IF482_OFFSET);
+
+  // wait until begin of a new second
+  t = tt = now();
+  do {
+    tt = now();
+  } while (t == tt);
+
+  const TickType_t startTime = xTaskGetTickCount();
+
+  // task remains in blocked state until it is notified by isr
+  for (;;) {
+    xTaskNotifyWait(
+        0x00,           // don't clear any bits on entry
+        ULONG_MAX,      // clear all bits on exit
+        &wakeTime,      // receives moment of call from isr
+        portMAX_DELAY); // wait forever (missing error handling here...)
+
+    t = now();
+    wakeTime -= startTime;
+
+    // now we're synced to start of second t and wait
+    // until it's time to start transmit telegram for t+1
+    vTaskDelayUntil(&wakeTime, shotTime);
+    IF482.print(if482Telegram(t + 1));
+  }
+  vTaskDelete(IF482Task); // shoud never be reached
+} // if482_loop()
+
+// interrupt service routine triggered by RTC 1Hz precise clock
+void IRAM_ATTR IF482IRQ() {
+  xTaskNotifyFromISR(IF482Task, xTaskGetTickCountFromISR(), eSetBits, NULL);
+  portYIELD_FROM_ISR();
+}
 
 #endif // HAS_IF482

src/irqhandler.cpp

@@ -18,12 +18,6 @@ void irqHandler(void *pvParameters) {
         &InterruptStatus, // Receives the notification value
         portMAX_DELAY);   // wait forever (missing error handling here...)
 
-// IF482 interrupt?
-#ifdef HAS_IF482
-    if (InterruptStatus & IF482_IRQ)
-      sendIF482(now());
-#endif
-
 // button pressed?
 #ifdef HAS_BUTTON
     if (InterruptStatus & BUTTON_IRQ)
@@ -78,10 +72,3 @@ void IRAM_ATTR ButtonIRQ() {
   portYIELD_FROM_ISR();
 }
 #endif
-
-#ifdef HAS_IF482
-void IRAM_ATTR IF482IRQ() {
-  xTaskNotifyFromISR(irqHandlerTask, IF482_IRQ, eSetBits, NULL);
-  portYIELD_FROM_ISR();
-}
-#endif

src/main.cpp

@@ -29,6 +29,7 @@ Task          Core  Prio  Purpose
 ====================================================================================
 wifiloop      0     4     rotates wifi channels
 ledloop       0     3     blinks LEDs
+if482loop     1     3     serial feed of IF482 time telegrams
 spiloop       0     2     reads/writes data on spi interface
 IDLE          0     0     ESP32 arduino scheduler -> runs wifi sniffer
 
@@ -44,11 +45,15 @@ Tasks using i2c bus all must have same priority, because using mutex semaphore
 (irqhandler, bmeloop)
 
 ESP32 hardware timers
-==========================
+================================
- 0	Trigger display refresh
+ 0	triggers display refresh
- 1	Trigger Wifi channel switch
+ 1	triggers Wifi channel switch
- 2	Trigger send payload cycle
+ 2	triggers send payload cycle
- 3	Trigger housekeeping cycle
+ 3	triggers housekeeping cycle
+
+ RTC hardware timer (if present)
+================================
+ triggers IF482 clock generator
 
 */
 
@@ -185,9 +190,18 @@ void setup() {
   sync_rtctime();
 #ifdef HAS_IF482
   strcat_P(features, " IF482");
-  if482_init();
+  if (if482_init()) {
-#endif
+    ESP_LOGI(TAG, "Starting IF482loop...");
-#endif
+    xTaskCreatePinnedToCore(if482_loop,  // task function
+                            "if482loop", // name of task
+                            2048,        // stack size of task
+                            (void *)1,   // parameter of the task
+                            3,           // priority of the task
+                            &IF482Task,  // task handle
+                            0);          // CPU core
+  }
+#endif // HAS_IF482
+#endif // HAS_RTC
 
 // initialize wifi antenna
 #ifdef HAS_ANTENNA_SWITCH

src/paxcounter.conf

@@ -81,9 +81,10 @@
 #define OTA_MIN_BATT                    3600    // minimum battery level for OTA [millivolt]
 #define RESPONSE_TIMEOUT_MS             60000   // firmware binary server connection timeout [milliseconds]
 
-// setting for syncing time of node
+// settings for syncing time of node and external time sources
-#define TIME_SYNC_INTERVAL              60      // sync time each ... minutes with external source [default = 60], comment out means off          
+//#define TIME_SYNC_INTERVAL              60      // sync time each ... minutes with external source [default = 60], comment out means off          
 #define TIME_SYNC_INTERVAL_RTC          5       // sync time each ... minutes with RTC [default = 5], comment out means off          
+#define IF482_OFFSET                    984     // 1sec minus IF482 serial transmit time [ms]: e.g. 9 bits * 17 bytes * 1/9600 bps = 16ms
 
 // LMIC settings
 // moved to src/lmic_config.h