Can I measure battery level without any external components nrf51

[Mikhail]

I want to undestand this. I can't see any examples with it. In the example ble_app_proximity I always received 100% level. If it possible, can anybody give a ADC config example for it? Thanks.

[Mikhail]

Tnanks. But I still have question- how to init ADC in SDK9? As I understand, I should setting in function

nrf_adc_input_select()

transfer to it

NRF_ADC_CONFIG_SCALING_SUPPLY_ONE_THIRD

is it correct?

function nrf_adc_input_select()

__STATIC_INLINE void nrf_adc_input_select(nrf_adc_config_input_t input)
{
NRF_ADC->CONFIG =
    ((uint32_t)input << ADC_CONFIG_PSEL_Pos) | (NRF_ADC->CONFIG & ~ADC_CONFIG_PSEL_Msk);

if (input != NRF_ADC_CONFIG_INPUT_DISABLED)
{
    NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled << ADC_ENABLE_ENABLE_Pos;
}
else
{
    NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Disabled << ADC_ENABLE_ENABLE_Pos;
}

}

[Mikhail]

in my same example on SDK9 I have next code

/**

• @brief ADC initialization. */ void adc_config(void) { const nrf_adc_config_t nrf_adc_config = NRF_ADC_CONFIG_DEFAULT;

  // Initialize and configure ADC nrf_adc_configure( (nrf_adc_config_t *)&nrf_adc_config); nrf_adc_input_select(NRF_ADC_CONFIG_INPUT_2); nrf_adc_int_enable(ADC_INTENSET_END_Enabled << ADC_INTENSET_END_Pos); NVIC_SetPriority(ADC_IRQn, NRF_APP_PRIORITY_HIGH); NVIC_EnableIRQ(ADC_IRQn); }

As we see, it is no measure internal batt level by code:

nrf_adc_input_select(NRF_ADC_CONFIG_INPUT_2);