Comments (1)
I found the explanation for the behavior here: https://github.com/SpenceKonde/AVR-Guidance/blob/master/UPDI/jtag2updi.md
"The UPDI protocol uses parity and 2 stop bits (parity can be disabled by a control register flag, but you need to access UPDI in the default mode using parity to change this). Adapters that do not support parity or 2 stop bits, such as the MCP2200 and MCP2221, cannot be used."
Looks like it is not possible to use MCP2221 for UPDI because it only supports 8N1.
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