BME task removed / do i2c masking via interrupt

include/bmesensor.h

@@ -11,14 +11,16 @@
 #include <Adafruit_BME280.h>
 #endif
 
+extern Ticker bmecycler;
+
 extern bmeStatus_t
     bme_status; // Make struct for storing gps data globally available
-extern TaskHandle_t BmeTask;
 
 // --- Bosch BSEC v1.4.7.4 library configuration ---
 // 3,3V supply voltage; 3s max time between sensor_control calls; 4 days
 // calibration. Change this const if not applicable for your application (see
 // BME680 datasheet)
+// Note: 3s max time not exceed BMECYCLE frequency set in paxcounter.conf!
 const uint8_t bsec_config_iaq[454] = {
     4,   7,   4,   1,   61,  0,   0,   0,   0,   0,   0,   0,   174, 1,   0,
     0,   48,  0,   1,   0,   0,   192, 168, 71,  64,  49,  119, 76,  0,   0,
@@ -54,7 +56,8 @@ const uint8_t bsec_config_iaq[454] = {
 
 // Helper functions declarations
 int bme_init();
-void bme_loop(void *pvParameters);
+void bmecycle(void);
+void bme_storedata(bmeStatus_t *bme_store);
 int checkIaqSensorStatus(void);
 void loadState(void);
 void updateState(void);

include/irqhandler.h

@@ -8,12 +8,14 @@
 #define TIMESYNC_IRQ 0x010
 #define MASK_IRQ 0x020
 #define UNMASK_IRQ 0x040
+#define BME_IRQ 0x080
 #define MATRIX_DISPLAY_IRQ 0x100
 
 #include "globals.h"
 #include "cyclic.h"
 #include "senddata.h"
 #include "timekeeper.h"
+#include "bmesensor.h"
 
 void irqHandler(void *pvParameters);
 void mask_user_IRQ();

src/bmesensor.cpp

@@ -5,8 +5,9 @@
 // Local logging tag
 static const char TAG[] = __FILE__;
 
-bmeStatus_t bme_status;
-TaskHandle_t BmeTask;
+bmeStatus_t bme_status = {0};
+
+Ticker bmecycler;
 
 #define SEALEVELPRESSURE_HPA (1013.25)
 
@@ -37,6 +38,8 @@ Adafruit_BME280 bme; // I2C
 
 #endif
 
+void bmecycle() { xTaskNotify(irqHandlerTask, BME_IRQ, eSetBits); }
+
 // initialize BME680 sensor
 int bme_init(void) {
 
@@ -136,47 +139,37 @@ int checkIaqSensorStatus(void) {
 } // checkIaqSensorStatus()
 #endif
 
-// loop function which reads and processes data based on sensor settings
-void bme_loop(void *pvParameters) {
-
-  configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
+// store current BME sensor data in struct
+void bme_storedata(bmeStatus_t *bme_store) {
+  if (I2C_MUTEX_LOCK()) { // block i2c bus access
 
 #ifdef HAS_BME680
-  while (1) {
-    // block i2c bus access
-    if (I2C_MUTEX_LOCK()) {
-      if (iaqSensor.run()) { // If new data is available
-        bme_status.raw_temperature =
-            iaqSensor.rawTemperature; // Temperature in degree celsius
-        bme_status.raw_humidity = iaqSensor.rawHumidity;
-        bme_status.temperature = iaqSensor.temperature;
-        bme_status.humidity =
-            iaqSensor.humidity; // Humidity in % relative humidity x1000
-        bme_status.pressure =   // Pressure in Pascal
+    if (iaqSensor.run()) { // if new data is available
+      bme_store->raw_temperature =
+          iaqSensor.rawTemperature; // temperature in degree celsius
+      bme_store->raw_humidity = iaqSensor.rawHumidity;
+      bme_store->temperature = iaqSensor.temperature;
+      bme_store->humidity =
+          iaqSensor.humidity;           // humidity in % relative humidity x1000
+      bme_store->pressure =             // pressure in Pascal
           (iaqSensor.pressure / 100.0); // conversion Pa -> hPa
-        bme_status.iaq = iaqSensor.iaqEstimate;
-        bme_status.iaq_accuracy = iaqSensor.iaqAccuracy;
-        bme_status.gas = iaqSensor.gasResistance; // Gas resistance in Ohms
+      bme_store->iaq = iaqSensor.iaqEstimate;
+      bme_store->iaq_accuracy = iaqSensor.iaqAccuracy;
+      bme_store->gas = iaqSensor.gasResistance; // gas resistance in ohms
       updateState();
     }
-      I2C_MUTEX_UNLOCK();
-    }
-  }
 #elif defined HAS_BME280
-  while (1) {
-    if (I2C_MUTEX_LOCK()) {
-      bme_status.temperature = bme.readTemperature();
-      bme_status.pressure =
-          (bme.readPressure() / 100.0); // conversion Pa -> hPa
+    bme_store->temperature = bme.readTemperature();
+    bme_store->pressure = (bme.readPressure() / 100.0); // conversion Pa -> hPa
     // bme.readAltitude(SEALEVELPRESSURE_HPA);
-      bme_status.humidity = bme.readHumidity();
-      bme_status.iaq = 0; // IAQ feature not present with BME280
-      I2C_MUTEX_UNLOCK();
-    }
-  }
+    bme_store->humidity = bme.readHumidity();
+    bme_store->iaq = 0; // IAQ feature not present with BME280
 #endif
 
-} // bme_loop()
+    I2C_MUTEX_UNLOCK(); // release i2c bus access
+  }
+
+} // bme_storedata()
 
 #ifdef HAS_BME680
 void loadState(void) {

src/cyclic.cpp

@@ -38,10 +38,6 @@ void doHousekeeping() {
   ESP_LOGD(TAG, "Gpsloop %d bytes left | Taskstate = %d",
            uxTaskGetStackHighWaterMark(GpsTask), eTaskGetState(GpsTask));
 #endif
-#if (HAS_BME)
-  ESP_LOGD(TAG, "Bmeloop %d bytes left | Taskstate = %d",
-           uxTaskGetStackHighWaterMark(BmeTask), eTaskGetState(BmeTask));
-#endif
 #if (defined HAS_DCF77 || defined HAS_IF482)
   ESP_LOGD(TAG, "Clockloop %d bytes left | Taskstate = %d",
            uxTaskGetStackHighWaterMark(ClockTask), eTaskGetState(ClockTask));
@@ -59,16 +55,15 @@ void doHousekeeping() {
   ESP_LOGI(TAG, "Voltage: %dmV", batt_voltage);
 #endif
 
-// display BME sensor data
+// display BME680/280 sensor data
+#if (HAS_BME)
 #ifdef HAS_BME680
   ESP_LOGI(TAG, "BME680 Temp: %.2f°C | IAQ: %.2f | IAQacc: %d",
            bme_status.temperature, bme_status.iaq, bme_status.iaq_accuracy);
-#endif
-
-// display BME280 sensor data
-#ifdef HAS_BME280
+#elif defined HAS_BME280
   ESP_LOGI(TAG, "BME280 Temp: %.2f°C | Humidity: %.2f | Pressure: %.0f",
            bme_status.temperature, bme_status.humidity, bme_status.pressure);
+#endif
 #endif
 
   // check free heap memory

src/irqhandler.cpp

@@ -45,6 +45,12 @@ void irqHandler(void *pvParameters) {
       refreshTheMatrixDisplay();
 #endif
 
+// BME sensor data to be read?
+#if (HAS_BME)
+    if (InterruptStatus & BME_IRQ)
+      bme_storedata(&bme_status);
+#endif
+
     // are cyclic tasks due?
     if (InterruptStatus & CYCLIC_IRQ)
       doHousekeeping();

src/main.cpp

@@ -35,7 +35,6 @@ clockloop     1     4     generates realtime telegrams for external clock
 timesync_req  1     3     processes realtime time sync requests
 irqhandler    1     2     display, timesync, gps, etc. triggered by timers
 gpsloop       1     2     reads data from GPS via serial or i2c
-bmeloop       1     2     reads data from BME sensor via i2c
 looptask      1     1     runs the LMIC LoRa stack (arduino loop)
 IDLE          1     0     ESP32 arduino scheduler -> runs wifi channel rotator
 
@@ -63,6 +62,7 @@ fired by software (Ticker.h)
 TIMESYNC_IRQ    -> timeSync()     -> irqHandlerTask (Core 1)
 CYLCIC_IRQ      -> housekeeping() -> irqHandlerTask (Core 1)
 SENDCYCLE_IRQ   -> sendcycle()    -> irqHandlerTask (Core 1)
+BME_IRQ         -> bmecycle()     -> irqHandlerTask (Core 1)
 
 
 // External RTC timer (if present)
@@ -368,16 +368,8 @@ void setup() {
 #elif defined HAS_BME280
   strcat_P(features, " BME280");
 #endif
-  if (bme_init()) {
+  if (bme_init())
     ESP_LOGI(TAG, "Starting BME sensor...");
-    xTaskCreatePinnedToCore(bme_loop,  // task function
-                            "bmeloop", // name of task
-                            2048,      // stack size of task
-                            (void *)1, // parameter of the task
-                            2,         // priority of the task
-                            &BmeTask,  // task handle
-                            1);        // CPU core
-  }
 #endif
 
   // starting timers and interrupts
@@ -418,6 +410,7 @@ void setup() {
   // cyclic function interrupts
   sendcycler.attach(SENDCYCLE * 2, sendcycle);
   housekeeper.attach(HOMECYCLE, housekeeping);
+  bmecycler.attach(BMECYCLE, bmecycle);
 
 #if (TIME_SYNC_INTERVAL)
 

src/paxcounter.conf

@@ -58,6 +58,7 @@
 // Settings for BME680 environmental sensor
 #define BME_TEMP_OFFSET                 5.0f    // Offset sensor on chip temp <-> ambient temp [default = 5°C]
 #define STATE_SAVE_PERIOD               UINT32_C(360 * 60 * 1000) // update every 360 minutes = 4 times a day
+#define BMECYCLE                        1       // bme sensor read cycle in seconds [default = 1 secs]
 
 // OTA settings
 #define USE_OTA                         1       // set to 0 to disable OTA update