Comments (2)
If finish
is called while an error condition has been detected, resume_after_error
flushes the tx fifo and restarts the SM, and wait_idle
waits until the SM has stalled on the first OUT
instruction.
stop
only sends instructions and therefore cannot generate an error condition (=no ack).
In case of error during a read operation, the data in the buffer are unreliable, there's no feed back to caller as to how many bytes were received before the error. A caller may rely on pattern matching to detect that?
read
should empty the rx fifo before exiting to drain all the success fully clocked in bytes.
write
already flushes the RX firo before exiting, as any rx bytes are to be ignored.
This'd effectively ensure that finish
is always called with an empty RX FIFO (possibly in case of error, with a non-empty TX fifo to be drained by resume_after_error
).
from i2c-pio-rs.
This should be fixed by #17.
from i2c-pio-rs.
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from i2c-pio-rs.