NRF52832 SAADC HOW TO GET ADC RESULT FROM THE BUFFER !

[omar]

i m new in NRF52832, i use saadc exemple pca 10040 sdk 13.0.0, i dont now how to get adc result from the buffer because there is 2 elements in the buffer :

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);

thanks for help

[Jørgen Holmefjord]

Hi,

The SAADC peripheral support double buffering, allowing you to sample to a second buffer while processing samples in the first buffer.

You can read the samples in saadc_callback, from the parameter p_event->data.done.p_buffer[i]. Depending on the define SAMPLES_IN_BUFFER, there might be multiple samples in each buffer.

Best regards,

Jørgen

[Jørgen Holmefjord]

In the callback, p_buffer will contain SAMPLES_IN_BUFFER number of samples. They can be accessed using the index:

p_event->data.done.p_buffer[0] --> First sample
p_event->data.done.p_buffer[1] --> Second sample
...
p_event->data.done.p_buffer[SAMPLES_IN_BUFFER-1] --> Last sample