RE: nrf52 with Mynewt multi channel ADC configuration

shanyechungu — Tue, 11 Aug 2020 17:05:31 GMT

I solved the problem. It was caused by code error in the value readout function:

below is the correct one which works now.

uint16_t *
adc_read(void *buffer, int buffer_len)
{
    int i;
    int j;
    int adc_result;

    for (j = 0; j < ADC_NUMBER_CHANNELS; j++) {
        for (i = 0; i < ADC_NUMBER_SAMPLES - 1; i++) {
            adc_buf_read(adc, buffer, buffer_len, j, &adc_result);
            adc_buf_release(adc, buffer, buffer_len);
        }
        result_mv[j] = adc_result_mv(adc, j, adc_result); // RESULT = (V(P) – V(N)) * (GAIN/REFERENCE) * 2^RESOLUTION
    }

    return result_mv;
}