NRF52 with MPU9255: magnetometer with easydma

RE: NRF52 with MPU9255: magnetometer with easydma

Kazi Afroza Sultana — Mon, 07 Nov 2022 09:15:21 GMT

Hello Kyle,

You may look at zephyr instead https://github.com/nrfconnect/sdk-zephyr/tree/main/drivers/sensor/mpu9250 , there is a MPU9250 driver.

Thanks.

Kazi

RE: NRF52 with MPU9255: magnetometer with easydma

kyle.ng1 — Tue, 01 Nov 2022 12:19:58 GMT

It's returned the value of magnetometer is 0. I had added the address for the magnetometer, but the result maintained. In the instruction, the status register MPU_AK89XX_REG_ST2 have to be read at the end maybe I'm missed this, but I don't know how to implement it, could you help me.

devzone.nordicsemi.com/.../01548.main.c

Thanks.

BR,

Kyle.

RE: NRF52 with MPU9255: magnetometer with easydma

Kazi Afroza Sultana — Tue, 01 Nov 2022 10:51:58 GMT

Hello,

We need more information. Have you got any error code to show which is not working? MPU_AK89XX_REG_HXL is your magnetometer. Have you defined it correctly according to the datasheet of the device?

Here we can see nrf5-mpu-examples/nrf_drv_mpu_twi.c at e2f654f27590388d3eb9a3730fe8fe8d510ff5d4 · Martinsbl/nrf5-mpu-examples (github.com) the address of magnetometer is 0x0C (#define MPU_AK89XX_MAGN_ADDRESS 0x0C). You have used the address of accelerometer as the address of magnetometer. So, it might not response.

Thanks.

Kazi

RE: NRF52 with MPU9255: magnetometer with easydma

kyle.ng1 — Thu, 27 Oct 2022 13:55:18 GMT

Hello Kazi,

1. I have modified the output pin and changing the p_tx_buffer[1] to read the address of magnetometer.

2. I'm using the latest SDK.

3. I'm using 5 pins of sensor to connect with the nRF52 2 pins power, SDA, SCL and INT pin. I'm using the TWIM.

Here is my main file:
devzone.nordicsemi.com/.../73678.main.c

Thanks.

Best Regards,

Kyle.

RE: NRF52 with MPU9255: magnetometer with easydma

Kazi Afroza Sultana — Thu, 27 Oct 2022 11:07:42 GMT

Hello Kyle,

We would like to know more information.

1. Did you use these examples without modifications?

2. Did you use Old SDK that the examples were written during building?

3. How did you connect the sensor to nRF52? Did you use TWI or SPI?

Thanks.

Kazi Afroza Sultana