Slight problem about cupdi HOT 8 OPEN

I have not used the c utility (I use pyupdi) but the symptom sounds like the double break recovery is not quite right.
You see, UPDI needs a slight nudge to wake it up (negative edge), but if its awake already, then the nudge is seen as a start-bit, which results in a framing error, which needs a double-break to recover from.
Omitting that nudge and going straight ahead with a SYNC will result in the opposite problem in case its not awake, and a similar recovery is required.
Not offering a fix, just a hint at what could be going wrong.

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Ah thanks - that sounds very plausible. Does pyupdi not have the same problem in which case I'll look in there to see if they have a fix for this.

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Ah - just realised you're the person who wrote pyupdi. I had to try the c version as the Python one wouldn't run on my PC - serial not found errors.

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pyupdi should work just fine (and if not it should be fixed), so give it a try again perhaps.
If you are using Linux, remember you need to tweak the permissions of your serial port.

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Never used Python before but it gave this.

Traceback (most recent call last):
File "C:\Users\Mike\Downloads\pyupdi-master\pyupdi-master\pyupdi.py", line 11, in
from updi.nvm import UpdiNvmProgrammer
File "C:\Users\Mike\Downloads\pyupdi-master\pyupdi-master\updi\nvm.py", line 6, in
from updi.application import UpdiApplication
File "C:\Users\Mike\Downloads\pyupdi-master\pyupdi-master\updi\application.py", line 7, in
from updi.link import UpdiDatalink
File "C:\Users\Mike\Downloads\pyupdi-master\pyupdi-master\updi\link.py", line 6, in
from updi.physical import UpdiPhysical
File "C:\Users\Mike\Downloads\pyupdi-master\pyupdi-master\updi\physical.py", line 6, in
import serial
ModuleNotFoundError: No module named 'serial'

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Without going into detail, this should help:
pip install pyserial
Then start to learn python ;)

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I'm a pure C++ person - anything else other than HTML/Javascript are things I'd never actually program in if I can avoid it :-)

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Nice to see you, Mraardvark.

Hi, Mike:
I‘m not suggest use CH340 for UPDI communication. You could see the datasheet:
https://cdn.sparkfun.com/datasheets/Dev/Arduino/Other/CH340DS1.PDF

It could not support 1.5 stop bit, not matches UPDI protocol.

The most USB/Serial part i suggested use for the UPDI are these below:

SiliconLab CP210x (be carefull don't use pirate copy part)

Or use MCU type like ATMEL SAML21/D21:
https://www.microchip.com/Developmenttools/ProductDetails/ATSAMD21-XPRO
https://www.microchipdirect.com/product/search/all/ATSAMD21-XPRO

Any question could message me by Wechart: 126676275
or Mail to [email protected]

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