RE: SAADSC event handler not called if buffer length > 1 (non-blocking mode)

Edvin — Wed, 01 Aug 2018 15:45:49 GMT

If you have an SAADC buffer with size of N you must call the sample function, nrf_drv_saadc_sample() N times before you get a callback. Note that you need a certain delay between the two calls.

I once made a simple example (in SDK15.0.0 (!)) that triggers a sample task on a buttonpress. Take a look at it, and see if it makes any sense.

devzone.nordicsemi.com/.../saadc_5F00_pin_5F00_int_5F00_change.zip

I used Keil and nRF52832, so if you use something else, you might need to add some pats and files to the project in order to compile.

Alternatively, if I understand the point of BATT_AVG_FACTOR correctly, you can look into just setting this to 1, and use oversampling (set this in sdk_config.h).

#define SAADC_CONFIG_OVERSAMPLE 0

set this to N, and the SAADC module will do 2^N samplings and average it.

Best regards,

Edvin

RE: SAADSC event handler not called if buffer length > 1 (non-blocking mode)

eyalasko — Wed, 01 Aug 2018 10:31:26 GMT

Some more info -

SAADC_CONFIG_LP_MODE == 1 - the behavior as described above
SAADC_CONFIG_LP_MODE == 0
- If BATT_AVG_FACTOR == 1, works as expected
- If BATT_AVG_FACTOR == 2 , does NOT get to SAADC_IRQHandler() even once !