abort() hangs

[bapowell]

For me this always hangs:

RPi2040_mPy/rp2_dma/rp2_dma.py

Line 403 in 1d109ce

while p[0]:

To fix, I replaced
while p[0]:
with
while self.busy():

This seems to agree with the comment at raspberrypi/pico-sdk#923:

...After aborting a channel, poll the CTRL.BUSY bit to wait for completion (not the ABORT bit), ...

[rkompass]

Hello @bapowell,

thank you for this finding and report.

Interesting to get feedback - now that there are DMA routines in the MP RP2 firmware.

I'll have to change my DMA class accordingly.

If you don't mind: In which setting did you use the DMA class?

Raul Kompaß

[bapowell]

I'm using DMA to transfer accumulated counts from PIO to memory.