Talking to an EEPROM via TWI using the NRF51DK

RE: Talking to an EEPROM via TWI using the NRF51DK

Brook Gebremedhin — Wed, 04 May 2016 10:27:40 GMT

@olba , i don't find any where a working makefile that has twi and soft device enabled. can you direct me to a working makefile that has twi and softdvice together ? thanks

RE: Talking to an EEPROM via TWI using the NRF51DK

bneil — Wed, 16 Mar 2016 17:28:10 GMT

Great, thanks, that took care of it

RE: Talking to an EEPROM via TWI using the NRF51DK

Ole Bauck — Wed, 16 Mar 2016 14:47:01 GMT

nrf_drv_twi_tx(..) needs and array of bytes/uint8_t not a uint32_t. With your code it will just send out 0 (the lowest 8 bits of the variable). Change to:

static uint8_t outgoing data[3] = {0x00, 0x80, 0xAA};

err_code = nrf_drv_twi_tx(&twi_driver, M24M02_ADDR, outgoing_data, sizeof(outgoing_data), false);
APP_ERROR_CHECK(err_code);

0x00 and 0x80 may need to be switched depending if the device needs MSB or LSB first. The array needs to be static or decleared outside of main() to not be placed on the stack (placed in RAM -> not removed after it is used). The last parameter needs to be false if you are not going to do a repeated transfer (tx + rx without issuing a stop condition in between).