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History

dehanj 2014923966 Isolate ringbuffer index, copy inbound usb data to new buffer		2023-12-07 17:15:24 +01:00
..
include	Add gpio for debug purpose	2023-11-06 12:19:00 +01:00
.gitignore	Make initial public release	2022-09-19 08:51:11 +02:00
baud rate calculator.ods	Make initial public release	2022-09-19 08:51:11 +02:00
encode_usb_strings.py	Make initial public release	2022-09-19 08:51:11 +02:00
inject_serial_number.py	Make initial public release	2022-09-19 08:51:11 +02:00
LICENSE	Ch552 license (#65 )	2023-01-03 15:48:53 +01:00
main.c	Isolate ringbuffer index, copy inbound usb data to new buffer	2023-12-07 17:15:24 +01:00
Makefile	Add (hardware) production tests for the TK-1 and TP-1 (#69 )	2023-01-11 16:33:01 +01:00
Makefile.include	Add (hardware) production tests for the TK-1 and TP-1 (#69 )	2023-01-11 16:33:01 +01:00
README.md	Add (hardware) production tests for the TK-1 and TP-1 (#69 )	2023-01-11 16:33:01 +01:00
usb_strings.h	Make initial public release	2022-09-19 08:51:11 +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.