I use direct input AIN2 pin battery 3.3v, the other pins are not connected to anything, I did not enter into ADC_IRQHandler,may ask about what the problem it
this is my code :
#define adc_PIN_NUMBER 1
NRF_ADC->INTENSET = ADC_INTENSET_END_Msk;
NRF_ADC->CONFIG = (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos)
| (ADC_CONFIG_PSEL_AnalogInput2 << ADC_CONFIG_PSEL_Pos)
| (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos)
| (ADC_CONFIG_INPSEL_AnalogInputOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos)
| (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos);
NRF_ADC->EVENTS_END = 0;
NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
// Enable ADC interrupt
err_code = sd_nvic_ClearPendingIRQ(ADC_IRQn);
APP_ERROR_CHECK(err_code);
err_code = sd_nvic_SetPriority(ADC_IRQn, NRF_APP_PRIORITY_LOW);
APP_ERROR_CHECK(err_code);
err_code = sd_nvic_EnableIRQ(ADC_IRQn);
APP_ERROR_CHECK(err_code);
NRF_ADC->EVENTS_END = 0; // Stop any running conversions.
NRF_ADC->TASKS_START = 1;
nrf_gpio_cfg_input(adc_PIN_NUMBER , NRF_GPIO_PIN_PULLDOWN);
