BMM150

[CH_Miss]

The BMI150 can obtain valuable magnetometer data in the forcad mode, and then configure it to the normal mode. The magnetometer data is 0. I want to know where I am wrong with the configuration, or what causes this phenomenon.

[shellywang]

Please provide the  code for BMM150 configuration/initialization.

[CH_Miss]

uint8 bmm150_init(void)
{
uint8 init_ret = BMM150_ERROR;
uint8 self_test_fault_cnt = 0;

init_ret = bmm150_read_pwr_control();
if(BMM150_OK != init_ret)
{
init_ret = bmm150_set_pwr_control(BMM150_PWR_OTHER_MODE);
if(BMM150_OK != init_ret)
{
return init_ret;
}
}

//bmm150_soft_reset();

init_ret = bmm150_read_id();
if(BMM150_OK != init_ret)
{
return init_ret;
}

#if (!NORMAL_WORK_MODE)

init_ret = bmm150_set_pwr_mode(BMM150_PWR_SLEEP_MODE);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_ready_en(BMM150_READY_EN);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_repxy(BMM150_REPXY_LOWPWR);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_repz(BMM150_REPZ_LOWPWR);
if(BMM150_OK != init_ret)
{
return init_ret;
}
#else

init_ret = bmm150_set_ready_en(BMM150_READY_EN);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_rate(BMM150_DATA_RATE_10HZ);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_repxy(BMM150_REPXY_REGULAR);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_repz(BMM150_REPZ_REGULAR);
if(BMM150_OK != init_ret)
{
return init_ret;
}

init_ret = bmm150_set_pwr_mode(BMM150_PWR_NORMAL_MODE);
if(BMM150_OK != init_ret)
{
return init_ret;
}


#endif
return BMM150_OK;
}

Thanks.

[shellywang]

Please check the following points with your code :

1. Try to read the Chip ID
2. Provide the  I2C or SPI wave form

Check the  register ‘Power Control’ bit in register 0x4B and ‘OP Mode’ bit in register  0x4C after initialization is complete.

Please download and use BMM150 API:

https://github.com/BoschSensortec/BMM150-Sensor-API