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We should perhaps have a ctx object returned from the display instead
of overloading the displas as the ctx context?

There is 10kb remaining as a buffer when the micropython and newlib
heaps were co-existing - it is now a compile error to use the newlib
heap on core1.

For some reason a portYIELD() is not enough to give the serial task the
option to run. I tried vTaskDelay() and that works. To not block more than
needed portYIELD() is still called when the queue is not full and only
call vTaskDelay() when it is full.

Closes #218

Slight formatting cleanup to ensure the docs are rendered and linked
properly.
Signed-off-by: Rahix <rahix@rahix.de>

The MSC interrupts can come in back to back, effectively blocking
the FreeRTOS timer task which resets the watchdog. This simple fix
simply resets the watchdog when performing an MSC read or write.

See merge request card10/firmware!419

See merge request card10/firmware!414

The -EIO error was triggering a warning in the caller.

Make private functions static
Allocate buffers on stack
Move constants out of header