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tillitis-key/hw/boards/mta1-usb-v1/ch552_fw
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dehanj 7019cd9048
remove whitespaces and tabs
2023-12-07 17:16:31 +01:00
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include remove whitespaces and tabs 2023-12-07 17:16:31 +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
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LICENSE Ch552 license (#65) 2023-01-03 15:48:53 +01:00
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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.