SAADC Scan Mode mixes channel buffers whan fast.

[schef]

Hi, i have a strange problem which happens when i use scan mode to get 3 separate channels on saadc.

For example when i use uint32_t ticks = nrf_drv_timer_us_to_ticks(&m_timer, 200); everytihing is ok but whan i use 50us buffers get mixed up?

Is this possible?

I use nrf52 with sdk 12.2.0

[tkorsdal]

Yes it is possible - I have seen the same. You must have enough time between sample events to allow 3 acquisitions and 3 conversions. See 37.5.2 og nRF52832 Product Specification.

[schef]

Thank you for pointing me to this section. What do you suggest on doing else? I don't need all three channels at the sametime. But i tought it would be much cleaner to init saadc once then using the tehnique of loop {init, sample, deinit}

I had a crash after many times of doing this. With signal interrupt and no backtrace.