nrf52 TWI error code

[kenearl]

Hi,

I am trying to write a I2C read and write wrappers for Invensense MPU9250. Previously, I was using SDK11 and I don't have any issue with it. However, after porting the code into the new SDK nRF5_SDK_12.2.0_f012efa, i kept getting errors. However, the error did not surface immediately, it's after a short period of continuous reading then it surfaces. I have tried 2 type of TWI approaches.

1. Using APP_TWI, I will get an internal error (code 3). Since I don't really need to use the scheduler, I tried to use the twi driver directly.
2. Using the TWI driver, I get an error code of (0x00008201) which I am unsure on how to even decipher it. Hopefully, someone can help me to unravel this issue.

best regards

[kenearl]

Hi,

below attached is the code. The error occured after nrf_drv_twi_rx.

ret_code_t ret;

	do
{
   uint8_t addr8 = (uint8_t)reg_addr;
   ret = nrf_drv_twi_tx(&m_twi_master, slave_addr, &addr8, 1, true);
   if (NRF_SUCCESS != ret)
   {
       break;
   }
   ret = nrf_drv_twi_rx(&m_twi_master, slave_addr, (uint8_t*)data_ptr, len);
}while (0);
	
	APP_ERROR_CHECK(ret);
	
return ret; //this is catered for MPU9250 API