RE: saadc sample convert issue

DH.Yoon — Tue, 28 May 2019 07:23:00 GMT

Thank you.

RE: saadc sample convert issue

Jørgen Holmefjord — Mon, 27 May 2019 14:25:25 GMT

Hi,

Is TEST defined/set or not? If not, what is BAT_ADC_IN defined as?

Note that NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE() expects the parameter to be of type nrf_saadc_input_t, which are defined as follows:

#define SAADC_CH_PSELP_PSELP_NC (0UL) /*!< Not connected */
#define SAADC_CH_PSELP_PSELP_AnalogInput0 (1UL) /*!< AIN0 */
#define SAADC_CH_PSELP_PSELP_AnalogInput1 (2UL) /*!< AIN1 */
#define SAADC_CH_PSELP_PSELP_AnalogInput2 (3UL) /*!< AIN2 */
#define SAADC_CH_PSELP_PSELP_AnalogInput3 (4UL) /*!< AIN3 */
#define SAADC_CH_PSELP_PSELP_AnalogInput4 (5UL) /*!< AIN4 */
#define SAADC_CH_PSELP_PSELP_AnalogInput5 (6UL) /*!< AIN5 */
#define SAADC_CH_PSELP_PSELP_AnalogInput6 (7UL) /*!< AIN6 */
#define SAADC_CH_PSELP_PSELP_AnalogInput7 (8UL) /*!< AIN7 */
#define SAADC_CH_PSELP_PSELP_VDD (9UL) /*!< VDD */

ARDUINO_A0_PIN is defined as 3 in pca10040.h, which will correspond to AIN2 on the board. GPIO P0.03 is actually AIN1. I recommend using NRF_SAADC_INPUT_AINx when configuring the pins used for sampling.

Best regards,
Jørgen