Waveshare NRF52840 - Page 35

NRF52840 Eval Kit User Manual
Vision: V1.0.1 Date: 2019.01.19 35 / 72
* |------------+---------------------|
*/
return rslt;
}
Working with NRF52840, you can use its library to realize the write/read function：
int8_t user_i2c_read(u8 dev_id, u8 reg_addr, u8 *reg_data, u16 len)
{
ret_code_t err_code =
nrf_drv_twi_tx(&m_twi,dev_id,&reg_addr,1,false);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_twi_rx(&m_twi,dev_id,reg_data,len);
APP_ERROR_CHECK(err_code);
return err_code;
}
#define MAX_WRITE_LENGTH 200
int8_t user_i2c_write(u8 dev_id, u8 reg_addr, u8 *reg_data, u16
len)
{
ret_code_t err_code;
uint8_t write_data[MAX_WRITE_LENGTH];
if(len>MAX_WRITE_LENGTH-1)
{
err_code = 1;
return err_code;
}
write_data[0] = reg_addr;
memcpy(&write_data[1],reg_data,len);
err_code =
nrf_drv_twi_tx(&m_twi,dev_id,write_data,len+1,false);
APP_ERROR_CHECK(err_code);
return err_code;