I2C write function error.

RE: I2C write function error.

Newbie — Fri, 01 Sep 2017 06:58:14 GMT

Hi Martin, My modified write function is as follows:

ret_code_t write(uint8_t address, uint8_t reg, uint8_t value) { ret_code_t ret_code; uint8_t data[2]; data[0] = reg; data[1] = value;

ret_code = nrf_drv_twi_tx(&m_twi,address, data, 2, false); printf("ret_c0de %d", ret_code); return ret_code;

}

In my main I am calling as: write(0x76, 0xF4, 0x01);

I am printing the ret_code and its giving me 0 integer value. Thanks,

RE: I2C write function error.

MartinBL — Fri, 01 Sep 2017 06:40:45 GMT

Where in the attached code are you checking the return value? After you initialize the TWI you call write_sensor_data() which in turn calls nrf_drv_twi_tx() and stores the return code in ret_code. But I can't see that you are checking ret_code anywhere.

RE: I2C write function error.

Newbie — Fri, 01 Sep 2017 06:18:46 GMT

Hello Martin, I checked return value of nrf_drv_twi_tx and I am getting 0. I think 0 means success. Can you suggest me code snippet of write function or can you modify my code snippet for write function? Thanks,

RE: I2C write function error.

MartinBL — Thu, 31 Aug 2017 14:42:39 GMT

Are you sure you are not getting any errors? You are not checking the return value of nrf_drv_twi_tx() anywhere in your code? You should also check for *_NACK events in your twi_handler().