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c5c46ba35b
The DAC can have some start-up delay. If we try to write to it before it's ready, it will get stuck. This happens now that `tests/driver_dac_dds` immediately sets a DAC value after init. The samd2x class of MCUs doesn't have this bit, but a quick test on samd10 shows that it might not be nececary there - the DAC does not get stuck when writing to it immediately after init.