Is something using DMA channel 0?

Philip Ashmore contact at
Wed Nov 6 23:57:26 EST 2013

Hi there.

Please forgive me in advance if I'm posting this question on the wrong list.

I wrote a C++ library to control the Bcm2835 from user space:

But it appears that something writes to the DMA channel 0 control
register at random intervals - I managed to get the i2s example running
for 5 seconds before the problem occurred. Other times it happens almost

I posted this bug originally:

Is something using dma channel 0?

Then I found someone else who wanted to do something like it:

How fast is GPIO+DMA? Multi I2S input

But no responses to either regarding my issue.

Is this the right place to post this question?

Philip Ashmore

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