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31 lines
864 B
Markdown
31 lines
864 B
Markdown
# CH552 USB-to-Serial firmware
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## Toolchain setup
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SDCC:
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sudo apt install build-essential sdcc
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chprog (for flashing the firmware to a device):
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cd ~
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sudo apt install libusb-1.0-0-dev
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git clone https://github.com/ole00/chprog.git
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cd chprog
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./build_linux.sh
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sudo cp chprog /usr/local/bin
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## Usage
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Build the firmware using a default serial number:
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make
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Flash the firmware to a device:
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make flash_patched
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## Re-programming the firmware
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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.
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