reTerminal DM: ch342f chip issue details
matsujirushi opened this issue · 2 comments
Hi,
I connected a USB-CDC device to the USB of reTerminal DM, but Serial is not recognized.
I checked and found that the cdc_acm driver was disabled.
https://github.com/Seeed-Studio/seeed-linux-dtoverlays/blob/master/scripts/reTerminal.sh#L430-L432
According to the comments, it seems that the cdc_acm driver is disabled due to an issue with the ch342f chip.
I would like to resolve the issue with the ch342f chip.
Could you please provide more details?
It's nice of you to help us fix this problem.
Here is detail steps to reproduce the issue of ch342f:
1 remove blacklist cdc_acm from /etc/modprobe.d/raspi-blacklist.conf
2 connect you PC and reTerminal DM with a usb-to-rs232 converter
3 opent the terminal of usb-to-rs232 on your computer
4 reboot the system
5 you will get some garbled characters when the system is booting up
These garbled characters is not what we want. So we install a new driver to fix this.
If you want to fix this. I think the best way is to take look into the source code of cdc_acm and try to support the ch342f correctly in it~
Thank you for the detailed information.