How to know gpio and adc AINx mapping ?

[Justin_Yeh]

Hi Sir

How to config channel and AINx to specific gpio for SAADC ?

For example,  if I want read adc voltage from NRF_GPIO_PIN_MAP(0,5), how to set the channel and AIN ? Thanks.

 nrf_saadc_channel_config_t channel_config =
        NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);

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  NRF_SAADC_INPUT_DISABLED = SAADC_CH_PSELP_PSELP_NC,           ///< Not connected.
    NRF_SAADC_INPUT_AIN0     = SAADC_CH_PSELP_PSELP_AnalogInput0, ///< Analog input 0 (AIN0).
    NRF_SAADC_INPUT_AIN1     = SAADC_CH_PSELP_PSELP_AnalogInput1, ///< Analog input 1 (AIN1).
    NRF_SAADC_INPUT_AIN2     = SAADC_CH_PSELP_PSELP_AnalogInput2, ///< Analog input 2 (AIN2).
    NRF_SAADC_INPUT_AIN3     = SAADC_CH_PSELP_PSELP_AnalogInput3, ///< Analog input 3 (AIN3).
    NRF_SAADC_INPUT_AIN4     = SAADC_CH_PSELP_PSELP_AnalogInput4, ///< Analog input 4 (AIN4).
    NRF_SAADC_INPUT_AIN5     = SAADC_CH_PSELP_PSELP_AnalogInput5, ///< Analog input 5 (AIN5).
    NRF_SAADC_INPUT_AIN6     = SAADC_CH_PSELP_PSELP_AnalogInput6, ///< Analog input 6 (AIN6).
    NRF_SAADC_INPUT_AIN7     = SAADC_CH_PSELP_PSELP_AnalogInput7, ///< Analog input 7 (AIN7).
    NRF_SAADC_INPUT_VDD      = SAADC_CH_PSELP_PSELP_VDD           ///< VDD as input.

[Turbo J]

Assumung you use the NRF52832, the analog inputs are documented in the PS (product specification) chapter 4 "Pin assignments": P0.05 is mapped to AIN2.

[Justin_Yeh]

Thanks.