mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2025-08-02 03:36:06 -04:00
d94387a9e7
- 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 |
||
|---|---|---|
| .. | ||
| inc | ||
| src | ||
| .gitignore | ||
| encode_usb_strings.py | ||
| inject_serial_number.py | ||
| LICENSE | ||
| Makefile | ||
| 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.