Not sure if this is the same peripheral as the serial block in the SH1, but I never managed to get that one to work either. In my case it kept triggering interrupts that I didn't want/expect.
Uhg, why is the SH SCIF serial port such a pain to program manually? Trying to debug early failure no output.
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Got it working now. It was more the ridiculously many abstraction layers in Linux than the actual hardware interface that made it difficult to figure out. Not using interrupts, pure polling.
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Linux certainly does have a tendency to turn 5 register writes into hundreds of lines of code
End of conversation
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