Once upon a time, a long time ago there was information about interrupt priorities when using ctl. On some architectures, you need to use the ctl_set_priority() function to ensure that the MSB is set. There isn't really anything documented about this. It would be nice to add this information to the ctl_enter_isr() sections. I just had a new employee get an error due to this. He had read the ctl documentation but this wasn't listed. I tried to find it and couldn't either.
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