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tillitis-key/hw/usb_interface/ch552_fw
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Jonas Thörnblad b5623037b7
ch552: Fix CDC configuration problem on Windows 
Fix CDC configuration problem on Windows when we have a composite
device (multiple different Device Classes). Add "Interface Association
Descriptor" to make it work.
2025-02-06 16:20:35 +01:00
..
include ch552: Add new USB debug pipe (TKEYCTRL) 2025-02-06 16:20:35 +01:00
.gitignore USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00
baud rate calculator.ods USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00
encode_usb_strings.py ch552: Add USB HID and protocol support over UART 2025-02-06 16:20:34 +01:00
inject_serial_number.py USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00
LICENSE USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00
main.c ch552: Fix CDC configuration problem on Windows 2025-02-06 16:20:35 +01:00
Makefile ch552: Add USB HID and protocol support over UART 2025-02-06 16:20:34 +01:00
Makefile.include ch552: Add USB HID and protocol support over UART 2025-02-06 16:20:34 +01:00
README.md USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00

README.md

CH552 USB-to-Serial firmware

Toolchain setup

SDCC:

sudo apt install build-essential sdcc

chprog (for flashing the firmware to a device):

cd ~
sudo apt install libusb-1.0-0-dev
git clone https://github.com/ole00/chprog.git
cd chprog
./build_linux.sh
sudo cp chprog /usr/local/bin

Usage

Build the firmware using a default serial number:

make

Flash the firmware to a device:

make flash_patched

Re-programming the firmware

By design, once the USB to serial firmware is loaded onto the chip, there isn't an intended way to reflash it using only software. However, if 3.3V is applied to the D+ line through a 10K resistor during power-up, then the CH552 will enter bootloader mode, and a new firmware can be programmed onto the chip. Note that the CH552 flash is only guaranteed for a few hundred flash cycles.