DC1MBY
commented
2 years ago 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.
Did anybody program successfully over UPDI with an MCP2221? I'd like to use MCP2221 in an project together with atmega4809. I'm running Win10 and get the following error:
pymcuprog erase -t uart -u COM6 -d atmega4809 pymcuprog.serialupdi.link - WARNING - Check failed pymcuprog.serialupdi.link - WARNING - Check failed Traceback (most recent call last): File "c:\users\xxx\appdata\local\programs\python\python36\lib\runpy.py", line 193, in _run_module_as_main "main", mod_spec) File "c:\users\xxx\appdata\local\programs\python\python36\lib\runpy.py", line 85, in _run_code exec(code, run_globals) File "C:\Users\xxx\AppData\Local\Programs\Python\Python36\Scripts\pymcuprog.exe__main.py", line 7, in
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\pymcuprog.py", line 285, in main
return pymcuprog_main.pymcuprog(arguments)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\pymcuprog_main.py", line 80, in pymcuprog
status = _start_session(backend, device_selected, args)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\pymcuprog_main.py", line 549, in _start_session
backend.start_session(sessionconfig)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\backend.py", line 366, in start_session
sessionconfig.interface_speed)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\programmer.py", line 83, in setup_device
options=self.options)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\nvm.py", line 42, in get_nvm_access_provider
accessprovider = NvmAccessProviderSerial(transport, device_info, baud=frequency, options=options)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\nvmserialupdi.py", line 51, in init
self.avr = UpdiApplication(port, baud, self.dut)
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\serialupdi\application.py", line 81, in init__
datalink.init_datalink()
File "c:\users\xxx\appdata\local\programs\python\python36\lib\site-packages\pymcuprog\serialupdi\link.py", line 45, in init_datalink
raise PymcuprogError("UPDI initialisation failed")
pymcuprog.pymcuprog_errors.PymcuprogError: UPDI initialisation failed
pymcuprog --version pymcuprog version 3.10.2.133