• I'm wondering if once the speed is set, it stays the same. Perhaps try setting to 400000 after a fresh boot?

  • Hi @Wilberforce I tried your suggestion. I set it to 1Mhz after clean boot and the clock frequency is now correct but there are HUGE gaps between bytes. See pics -- the first shows 1Mhz for clock pulses and the second shows some bytes sent with the big gaps between.

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