BMI270 init with I2C

[Eason]

Hallo

I try to use this programm.When I use SPI, BMI runs normally.But in the process of using IIC, there was a problem. In the setup program, the value of rslt is not equal to the BMI_OK value.This means this connection was not successful.

09:58:59.151 rslt-> -2 
09:58:59.151 BMI_OK-> 0

This is my setup program, what went wrong. Thank you very much

void setup() {


  /* Variable to define result */
  int8_t rslt;
  pinMode(BMI270_CS, OUTPUT);
  pinMode(interruptPin, INPUT_PULLUP);
  digitalWrite(BMI270_CS, HIGH);
  //  Wire.setModule(0);
  Serial.begin(115200);

  i2c_bus = 0x68;
 // spi_bus = BMI270_CS;
  /* To initialize the hal function */

  //SPI.begin();
  Wire.begin();
  bmi2.intf_ptr = &i2c_bus;
  bmi2.intf = BMI2_I2C_INTF;
  bmi2.read = bmi2xy_hal_i2c_bus_read;
  bmi2.write = bmi2xy_hal_i2c_bus_write;
  bmi2.read_write_len = 32;
  bmi2.delay_us = bmi2xy_hal_delay_usec;

  /* Config file pointer should be assigned to NULL, so that default file address is assigned in bmi270_init */
  bmi2.config_file_ptr = NULL;

  /* Initialize bmi270 */
  rslt = bmi270_init(&bmi2);

  Serial.println("bmi270_init done");

  rslt = bmi2_accel_gyro_set_config(&bmi2);
  Serial.println(rslt);
  Serial.println(BMI2_OK);
  if (rslt == BMI2_OK)
  {
    Serial.println("Accel data Ready : X Y Z ");
    Serial.println("Gyro data Ready : X Y Z ");
  }
  
  delay(250);
  // Interrupt PINs configuration
  struct bmi2_int_pin_config data_int_cfg;
  data_int_cfg.pin_type = BMI2_INT1;
  data_int_cfg.int_latch = BMI2_INT_NON_LATCH;
  data_int_cfg.pin_cfg[0].output_en = BMI2_INT_OUTPUT_ENABLE; // Output enabled
  data_int_cfg.pin_cfg[0].od = BMI2_INT_PUSH_PULL;      // OpenDrain disabled
  data_int_cfg.pin_cfg[0].lvl = BMI2_INT_ACTIVE_LOW;      // Signal Low Active
  data_int_cfg.pin_cfg[0].input_en = BMI2_INT_INPUT_DISABLE;  // Input Disabled

  rslt =  bmi2_set_int_pin_config( &data_int_cfg, &bmi2);

  pinMode(interruptPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(interruptPin), RawDataHandler, FALLING);

}

[BSTRobin]

Hello Eason,

Which line you got -2 return value?

Suggest you could capture I2C waveform by logic analyzer, and compare the difference between SW code and I2C waveform.

[Eason]

From this line "Serial.println(rslt);" I get -2

 rslt = bmi2_accel_gyro_set_config(&bmi2);
  
  Serial.println(BMI2_OK);
  Serial.println(rslt);

void setup() {


  /* Variable to define result */
  int8_t rslt;
  pinMode(BMI270_CS, OUTPUT);
  pinMode(interruptPin, INPUT_PULLUP);
  digitalWrite(BMI270_CS, HIGH);
  //  Wire.setModule(0);
  Serial.begin(115200);

  i2c_bus = 0x68;
 // spi_bus = BMI270_CS;
  /* To initialize the hal function */

  //SPI.begin();
  Wire.begin();
  bmi2.intf_ptr = &i2c_bus;
  bmi2.intf = BMI2_I2C_INTF;
  bmi2.read = bmi2xy_hal_i2c_bus_read;
  bmi2.write = bmi2xy_hal_i2c_bus_write;
  bmi2.read_write_len = 16;
  bmi2.delay_us = bmi2xy_hal_delay_usec;

  /* Config file pointer should be assigned to NULL, so that default file address is assigned in bmi270_init */
  bmi2.config_file_ptr = NULL;

  /* Initialize bmi270 */
  rslt = bmi270_init(&bmi2);

  Serial.println("bmi270_init done");

  rslt = bmi2_accel_gyro_set_config(&bmi2);
  
  Serial.println(BMI2_OK);
  Serial.println(rslt);
  
  if (rslt == BMI2_OK)
  {
    Serial.println("Accel data Ready : X Y Z ");
    Serial.println("Gyro data Ready : X Y Z ");
  }
  
  delay(250);
  // Interrupt PINs configuration
  struct bmi2_int_pin_config data_int_cfg;
  data_int_cfg.pin_type = BMI2_INT1;
  data_int_cfg.int_latch = BMI2_INT_NON_LATCH;
  data_int_cfg.pin_cfg[0].output_en = BMI2_INT_OUTPUT_ENABLE; // Output enabled
  data_int_cfg.pin_cfg[0].od = BMI2_INT_PUSH_PULL;      // OpenDrain disabled
  data_int_cfg.pin_cfg[0].lvl = BMI2_INT_ACTIVE_LOW;      // Signal Low Active
  data_int_cfg.pin_cfg[0].input_en = BMI2_INT_INPUT_DISABLE;  // Input Disabled

  rslt =  bmi2_set_int_pin_config( &data_int_cfg, &bmi2);

  pinMode(interruptPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(interruptPin), RawDataHandler, FALLING);

}

[Eason]

Hallo

This is my program, which part of the program has a problem that prevents the BMI270 from connecting with Arduino Due

[Eason]

Hallo

This is my program, which part of the program has a problem that prevents the BMI270 from connecting with Arduino Due

[BSTRobin]

Hello Eason,

Return value -2 indicated communication fail error. Firstly you should check I2C communication works well.

This is I2C read/write function on STM32 platform for your reference.

int8_t SensorAPI_I2Cx_Read(uint8_t slave_address7, uint8_t subaddress, uint8_t *pBuffer, uint16_t ReadNumbr)
{
uint16_t DevAddress = slave_address7 << 1;

// send register address
HAL_I2C_Master_Transmit(&I2C_HANDLE, DevAddress, &subaddress, 1, BUS_TIMEOUT);
HAL_I2C_Master_Receive(&I2C_HANDLE, DevAddress, pBuffer, ReadNumbr, BUS_TIMEOUT);
return 0;
}

int8_t SensorAPI_I2Cx_Write(uint8_t slave_address7, uint8_t subaddress, uint8_t *pBuffer, uint16_t WriteNumbr)
{
uint16_t DevAddress = slave_address7 << 1;

GTXBuffer[0] = subaddress;
memcpy(&GTXBuffer[1], pBuffer, WriteNumbr);

// send register address
HAL_I2C_Master_Transmit(&I2C_HANDLE, DevAddress, GTXBuffer, WriteNumbr+1, BUS_TIMEOUT);
return 0;
}