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tillitis-key/hw/usb_interface/ch552_fw
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Jonas Thörnblad d94387a9e7
ch552: Split functionality into separate files 
- Move GPIO functions to gpio.c and gpio.h
- Move string handling functions for debug to lib.c and lib.h
- Add config.h and move config defines there
- Add debug print functionality via FPGA with framing protocol
- Add Flash Code and Flash Data functions to flash.c and flash.h
2025-04-07 11:00:11 +02:00
..
inc ch552: Split functionality into separate files 2025-04-07 11:00:11 +02:00
src ch552: Split functionality into separate files 2025-04-07 11:00:11 +02:00
.gitignore USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00
encode_usb_strings.py ch552: Reorganize file directory structure 2025-03-24 14:12:45 +01:00
inject_serial_number.py USB: move firmware for usb-to-serial MCU (CH552) 2024-06-25 15:47:22 +02:00
LICENSE doc: Update copyright notice on CH552 fw 2025-02-13 13:49:29 +01:00
Makefile ch552: Split functionality into separate files 2025-04-07 11:00:11 +02:00
README.md doc: Note in CH552 fw where to find CH55x Reset Controller 2025-02-12 14:09:20 +01:00

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.

The Blinkinlabs CH55x Reset Controller can help you do this:

https://shop-nl.blinkinlabs.com/products/ch55x-reset-controller

https://github.com/Blinkinlabs/ch55x_programmer

Note that the CH552 flash is only guaranteed for a few hundred flash cycles.