Add CH341 emulation class driver #1507
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Add CH341 class driver. This is not really a class but rather CH341 emulation firmware. It allows any supported general purpose microcontroller to appear to the host as a CH341 device (IC)
Add CH341 to built-in driver list (CFG_TUD_CH341)
Add CH341 example
Add ch441_device.c to rp2040/family.cmake. Add ch341_device.h include to tusb.h
unused parameters const static / static const TUSB_OPT_DEVICE_ENABLED / CFG_TUD_ENABLED CFG_TUD_MAX_SPEED=TUSB_SPEED_FULL
Added high speed descriptors though I'm not sure if the CH341 driver will work as a high speed device. Changed "buffer size" define names in tusb_config to clarify whether we are specifying fifo buffer sizes or endpoint max packet sizes
Remove floating point math Remove multi-interface support Remove un-needed logging Add missing comments Reduce memory footprint
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I have build_arm and build_aarch64 workflows fully green lit. Hopefully the others will go through too. I had to setup my own self-hosted runner to get through your workflow maze. You can't even have a printf in the example code. yikes! |
tud_ch341_read_char tud_ch341_write_char tud_ch341_write_str
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Describe the PR
Adds CH341 USB to serial emulation class.
Additional context
The CDC driver (for windows at-least) is problematic which is probably why all of the USB to serial IC manufacturers use their own proprietary driver. In my case, I was trying to implement an ESP32 programmer with a CDC interface only to discover that the windows CDC driver (usbser.sys) doesn't handle the RTS signal properly so there was no way to get it to work without modifying the esp scripts.
This CH341 emulation class supports all of the signals. DTR RTS CTS DSR RI DCD as well as BREAK.
Everything is working as of now with the latest master branch and an RP2040. I didn't look at the other bsp's so there may be a small amount of additional work to do.
Regards,
Travis Robinson
[email protected] (libusb-win32, libusbK, LibUsbDotNet)