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How to implement BME688 to LoRaWAN_End_Node on Nucleo-WL55JC1

huytyskland

Currently, I am working with an IoT application on the board Nucleo-WL55JC1 with the sensor BME688. The example I am using is LoRaWAN_End_Node downloaded from STM32Cube MX. 

What I did: I initialized the the BME688 and set up some configuration after the initialization of MX_LoRaWAN_Init(). I, then, set up some configuration outside the while loop. I "extern"ed the variables below so that I can used them elsewhere:

struct bme68x_dev bme;
struct bme68x_conf conf;
struct bme68x_heatr_conf heatr_conf;

Order of initialization are below:

/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_LoRaWAN_Init();
MX_I2C3_Init();
/* USER CODE BEGIN 2 */
int8_t rslt = bme68x_interface_init(&bme, BME68X_I2C_INTF);
rslt = bme68x_init(&bme);
 
//Set up the measurement
conf.filter = BME68X_FILTER_OFF;
conf.odr = BME68X_ODR_NONE;
conf.os_hum = BME68X_OS_16X;
conf.os_pres = BME68X_OS_1X;
conf.os_temp = BME68X_OS_2X;
rslt = bme68x_set_conf(&conf, &bme);
heatr_conf.enable = BME68X_ENABLE;
heatr_conf.heatr_temp = 300;
heatr_conf.heatr_dur = 100;
rslt = bme68x_set_heatr_conf(BME68X_SEQUENTIAL_MODE, &heatr_conf, &bme);
 
rslt = bme68x_set_op_mode(BME68X_SEQUENTIAL_MODE, &bme);

For obtaining the temperature/pressure/humidity/gas level, I got the data of the sensor in the function SendTxData in the file lora_app.c:

struct bme68x_data data;
  uint32_t del_period;
  uint8_t n_fields;
 
#ifdef CAYENNE_LPP
  uint8_t channel = 0;
#else
  uint16_t pressure = 0;
  int16_t temperature = 0;
  uint16_t humidity = 0;
  uint32_t i = 0;
  int32_t latitude = 0;
  int32_t longitude = 0;
  uint16_t altitudeGps = 0;
#endif /* CAYENNE_LPP */
 
  //EnvSensors_Read(&sensor_data);
  del_period = bme68x_get_meas_dur(BME68X_SEQUENTIAL_MODE, &conf, &bme) + (heatr_conf.heatr_dur * 1000);
  bme.delay_us(del_period, bme.intf_ptr);
  int8_t rslt = bme68x_get_data(BME68X_SEQUENTIAL_MODE, &data, &n_fields, &bme);
  float senTemp = data.temperature;
  float senPres = data.pressure;
  float senHumid = data.humidity;

The problem: as in the code, I set the sensor to work in sequential mode, however, the whole setup stopped working after the first measurement. The same thing happened when I set the sensor to work in parallel mode. Sleep mode worked okay and for Forced mode, I could achieve the first measurement before the sensor turned to sleep mode (correct).

image

Question: Where should I start tracking the problem or how do I fix this problem?

I hope to have responses from you.

Thank you very much, Huy Nguyen.

Parents

  • I have no idea (it is going to be hard for anyone to respond who has not used the same code as you, which will restrict it to very few people perhaps).

    Just from the debug you've shown, there is a 'join failed' error. Could it be that the join to the LoRaWAN network was not possible, and anything BME related is a red herring until you resolve that? You might need to raise this on a ST forum, if it is their stack.

    If it is unrelated to LoRaWAN, then it could be worth creating a simpler non-LoRaWAN small project just to test out your BME code,  and confirm that is working before adding it to the proper project code. That's how I would go about it all.

  • in reply to shabaz

    Hello Shabaz,

    Thank you for your response. First of all, I also had a small project in which I tested the BME688 on the Nucleo board and that project worked well (the project had nothing related to the LoRaWAN_End_Node example). Then I brought the whole code and added to the LoRaWAN_End_Node example and the issue occurred.

    Later, I narrowed the problem down to how to add a task to LoRaWAN_End_Node example. To be specific, I would divide the BME688's operation as tasks and register it to the LoRaWAN_End_Node. I am still stuck at that point.

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  • in reply to shabaz

    Hello Shabaz,

    Thank you for your response. First of all, I also had a small project in which I tested the BME688 on the Nucleo board and that project worked well (the project had nothing related to the LoRaWAN_End_Node example). Then I brought the whole code and added to the LoRaWAN_End_Node example and the issue occurred.

    Later, I narrowed the problem down to how to add a task to LoRaWAN_End_Node example. To be specific, I would divide the BME688's operation as tasks and register it to the LoRaWAN_End_Node. I am still stuck at that point.

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