task stack sizes tailored; semaphore controlled wifi task

platformio.ini

@@ -6,13 +6,13 @@
 
 ; ---> SELECT TARGET PLATFORM HERE! <---
 [platformio]
-;env_default = generic
+env_default = generic
 ;env_default = ebox
 ;env_default = heltec
 ;env_default = ttgov1
 ;env_default = ttgov2
 ;env_default = ttgov21old
-env_default = ttgov21new
+;env_default = ttgov21new
 ;env_default = ttgobeam
 ;env_default = lopy
 ;env_default = lopy4
@@ -29,7 +29,7 @@ description = Paxcounter is a proof-of-concept ESP32 device for metering passeng
 release_version = 1.5.7
 ; 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
+debug_level = 0
 ; UPLOAD MODE: select esptool to flash via USB/UART, select custom to upload to cloud for OTA
 upload_protocol = esptool
 ;upload_protocol = custom

src/cyclic.cpp

@@ -23,6 +23,19 @@ void doHousekeeping() {
   if (cfg.runmode == 1)
     ESP.restart();
 
+// task storage debugging //
+#ifdef HAS_LORA
+  ESP_LOGD(TAG, "Loraloop %d bytes left",
+           uxTaskGetStackHighWaterMark(LoraTask));
+#endif
+  ESP_LOGD(TAG, "Wifiloop %d bytes left",
+           uxTaskGetStackHighWaterMark(wifiSwitchTask));
+  ESP_LOGD(TAG, "Statemachine %d bytes left",
+           uxTaskGetStackHighWaterMark(stateMachineTask));
+#ifdef HAS_GPS
+  ESP_LOGD(TAG, "Gpsloop %d bytes left", uxTaskGetStackHighWaterMark(GpsTask));
+#endif
+
 // read battery voltage into global variable
 #ifdef HAS_BATTERY_PROBE
   batt_voltage = read_voltage();
@@ -48,7 +61,7 @@ void doHousekeeping() {
              esp_get_minimum_free_heap_size(), ESP.getFreeHeap());
     SendData(COUNTERPORT); // send data before clearing counters
     reset_counters();      // clear macs container and reset all counters
-    get_salt();          // get new salt for salting hashes
+    get_salt();            // get new salt for salting hashes
 
     if (esp_get_minimum_free_heap_size() <= MEM_LOW) // check again
       esp_restart(); // memory leak, reset device

src/globals.h

@@ -54,6 +54,7 @@ extern std::array<uint64_t, 0xff>::iterator it;
 extern std::array<uint64_t, 0xff> beacons;
 
 extern SemaphoreHandle_t xWifiChannelSwitchSemaphore;
+extern TaskHandle_t stateMachineTask, wifiSwitchTask;
 
 #ifdef HAS_GPS
 extern TaskHandle_t GpsTask;

src/main.cpp

@@ -59,7 +59,7 @@ hw_timer_t *channelSwitch, *displaytimer, *sendCycle, *homeCycle;
 uint8_t volatile ButtonPressedIRQ = 0, ChannelTimerIRQ = 0,
                  SendCycleTimerIRQ = 0, DisplayTimerIRQ = 0, HomeCycleIRQ = 0;
 
-TaskHandle_t stateMachineTask = NULL;
+TaskHandle_t stateMachineTask, wifiSwitchTask;
 
 SemaphoreHandle_t xWifiChannelSwitchSemaphore;
 
@@ -308,8 +308,13 @@ void setup() {
   // https://techtutorialsx.com/2017/05/09/esp32-get-task-execution-core/
 
   ESP_LOGI(TAG, "Starting Lora...");
-  xTaskCreatePinnedToCore(lorawan_loop, "loraloop", 2048, (void *)1, 1,
+  xTaskCreatePinnedToCore(lorawan_loop, /* task function */
-                          &LoraTask, 1);
+                          "loraloop",   /* name of task */
+                          2560,         /* stack size of task */
+                          (void *)1,    /* parameter of the task */
+                          1,            /* priority of the task */
+                          &LoraTask,    /* task handle*/
+                          1);           /* CPU core */
 #endif
 
 // if device has GPS and it is enabled, start GPS reader task on core 0 with
@@ -317,7 +322,13 @@ void setup() {
 // streaming NMEA data
 #ifdef HAS_GPS
   ESP_LOGI(TAG, "Starting GPS...");
-  xTaskCreatePinnedToCore(gps_loop, "gpsloop", 2048, (void *)1, 2, &GpsTask, 0);
+  xTaskCreatePinnedToCore(gps_loop,  /* task function */
+                          "gpsloop", /* name of task */
+                          1024,      /* stack size of task */
+                          (void *)1, /* parameter of the task */
+                          2,         /* priority of the task */
+                          &GpsTask,  /* task handle*/
+                          0);        /* CPU core */
 #endif
 
 // start BLE scan callback if BLE function is enabled in NVRAM configuration
@@ -339,10 +350,10 @@ void setup() {
   // start wifi channel rotation task
   xTaskCreatePinnedToCore(switchWifiChannel, /* task function */
                           "wifiloop",        /* name of task */
-                          3048,              /* stack size of task */
+                          1024,              /* stack size of task */
                           NULL,              /* parameter of the task */
                           4,                 /* priority of the task */
-                          NULL,              /* task handle*/
+                          &wifiSwitchTask,   /* task handle*/
                           0);                /* CPU core */
 
   // start state machine

src/wifiscan.cpp

@@ -57,7 +57,7 @@ void ChannelSwitchIRQ() {
 // Wifi channel rotation task
 void switchWifiChannel(void * parameter) {
   while (1) {
-    // task in block state to wait for channel switch timer interrupt event
+    // task is remaining in block state waiting for channel switch timer interrupt event
     xSemaphoreTake(xWifiChannelSwitchSemaphore, portMAX_DELAY);
     // rotates variable channel 1..WIFI_CHANNEL_MAX
     channel = (channel % WIFI_CHANNEL_MAX) + 1;