nrf51822 and mpu9250 magnetometer reading

[DXT]

hi,

I am currently learning to use the mpu6050 read and write code in the SDK from the nrf5_sdk_12.3.0_d7731ad to control mpu9250. The part of the gyroscope and accelerometer in mpu9250 is now complete, but when I try to read the WIA register of the magnetometer, the output from uart is always 0.

My partial configuration and output code is as follows:

#include "nrf_drv_uart.h"
#include "mpu6050.h"
#include "twi_master.h" 
#include "twi_master_config.h"

mpu6050_register_write(0x0B,0x01);
mpu6050_register_write(0x0A,0x10);
mpu6050_register_write(0x24,0x1D);
mpu6050_register_write(0x31,0x8C);
mpu6050_register_write(0x32,0x00);
mpu6050_register_write(0x34,0x80);

mpu6050_register_read(0x35,&data,1);
printf("%d",data);

[Rune Holmgren]

Hi,

My gut feeling tells me that the issue is related to the API calls you are making to the mpu6050, so it's possible you will need to contact Invensense to get help with their device. I would, however, recommend checking out this GitHub repository made by a colleague of mine to see if you might be able to get it to work by using the same operations as he did there.

Best regards,
Rune Holmgren

[DXT]

Thank you for your routine. However, because the communication mode I used before is i2c and my development board uses PCA10028, I would like to know if I have the method of using i2c to control MPU9250. In addition, the mpu6050 library I used before was from "nrf5_sdk_12. 3.0_d7731ad\components\drivers_ext\mpu6050"

[Edvin]

Hello,

I think you will have to backport the example that Rune linked to back to SDK12.3.0. SDK 12.3.0 does have i2c, so it should work, but you will have to include the mpu9250 drivers. Unfortunately, the SDK12.3.0 does not have the drivers for the mpu9250, but you should be able to use it similar to the mpu6050 when the registers are updated.

 

Best regards,

Edvin