EYSHSNZWZ saadc value differ from the value of nrf52DK with same code

RE: EYSHSNZWZ saadc value differ from the value of nrf52DK with same code

haakonsh — Sun, 26 Jul 2020 08:25:37 GMT

I suggest you re-check your pin mappings.

[quote user="nrfcho"]its not changing its still same value around 40..[/quote]

And if you connect AIN1 to VDD is the value still ~40?

RE: EYSHSNZWZ saadc value differ from the value of nrf52DK with same code

nrfcho — Sat, 25 Jul 2020 07:40:37 GMT

void saadc_init(void)
{
ret_code_t err_code;
nrf_saadc_channel_config_t channel_0_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN1);
nrf_saadc_channel_config_t channel_1_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);
nrf_saadc_channel_config_t channel_2_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN3);
err_code = nrf_drv_saadc_init(NULL, saadc_callback);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_channel_init(0, &channel_0_config);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_channel_init(1, &channel_1_config);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_channel_init(2, &channel_2_config);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);

err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);

}

this is my code for saadc_init

RE: EYSHSNZWZ saadc value differ from the value of nrf52DK with same code

nrfcho — Sat, 25 Jul 2020 07:04:10 GMT

its not changing its still same value around 40..

RE: EYSHSNZWZ saadc value differ from the value of nrf52DK with same code

haakonsh — Thu, 23 Jul 2020 16:26:20 GMT

What's the SAADC configuration?

Can you short AIN1 to VDD and read out the sampled value?