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  • Case ID: 326031
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Unusual issues after ADC is enabled and disabled

Karr

I have a development problem, please help me. Due to the power management requirements of the product, I need to enable and disable the ADC function in the program to save power. But the problem I'm having now is that once the ADC goes through enable->disable->enable, it can no longer trigger an interrupt to read the MCU input voltage. In my program, it only fires once to read the ADC value. What did I do wrong?

static nrf_saadc_value_t s_bufferPool[SAMPLES_IN_BUFFER];
uint16_t batteryVoltage;

static void adcCallbackFunc(nrf_drv_saadc_evt_t const *pEvent)
{
    if(pEvent->type == NRF_DRV_SAADC_EVT_DONE)
    {
        nrf_saadc_value_t adcResult = 0;
        ret_code_t errCode;
        errCode = nrf_drv_saadc_buffer_convert(pEvent->data.done.p_buffer, SAMPLES_IN_BUFFER);                                       
        APP_ERROR_CHECK(errCode);
        for (uint8_t i = 0; i < SAMPLES_IN_BUFFER; i++)
        {
            adcResult += pEvent->data.done.p_buffer[i];
        }
        batteryVoltage = ADC_RESULT_IN_MILLI_VOLTS(adcResult/SAMPLES_IN_BUFFER);
    }
}

void ADC_Read(void)
{
    ret_code_t errCode;
    errCode = nrf_drv_saadc_sample();
    APP_ERROR_CHECK(errCode);
}

void ADC_Init(void)
{
    ret_code_t errCode;
    
    errCode = nrf_drv_saadc_init(NULL, adcCallbackFunc);
    APP_ERROR_CHECK(errCode);
    
    nrf_saadc_channel_config_t channelConfig = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_VDD);
    
    errCode = nrf_drv_saadc_channel_init(0, &channelConfig);
    APP_ERROR_CHECK(errCode);
    errCode = nrf_drv_saadc_buffer_convert(s_bufferPool, SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(errCode);
}

void EnableADC()
{
    ADC_Init();
}

void DisableADC()
{
    nrfx_saadc_uninit();
}

int main(void)
{
    // Initialize.
    ADC_Init();
    log_init();
    timers_init();

    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    ConfirmAllData();
    advertising_init();
    conn_params_init();
    DisableADC();

    advertising_start();

    // Enter main loop.
    for (;;)
    {
        EnableADC();
        ADC_Read();
        DisableADC();
        idle_state_handle();
    }
}

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