Problem with SAADC examples for audio sampling

[stefano.luna]

I am using nRF52 pca10400 and I would sample some audio signal for short periods of time, but I found a lot of difficulties with the SAADC example from sdk 13, since if I put a value greater than 126 in SAMPLES_IN_BUFFER I get overflow.

I would also increase the sampling frequency by the variable ticks, but the minimum value allowed is 1 [ms] for this variable since it is declared as uint_32. So it means I can reach a maximum sampling frequency of 1kHz (?).

Can I modify in some way the function nrf_drv_timer_ms_to_ticks in order to get a higher sampling frequency?

Thank you.

[Jørgen Holmefjord]

You can try to increase the UART string length NRF_LOG_BACKEND_MAX_STRING_LENGTH and buffer size if using NRF_LOG_DEFERRED, NRF_LOG_DEFERRED_BUFSIZE. You can also try with a higher baudrate for the UART communication, NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE. All these parameters can be configured in sdk_config.h. You can also try using RTT as the backend for NRF_LOG, and use J-Link RTT Viewer to view the samples.