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CH552 devkit

CH552 development board with hardware reboot into bootloader feature.

Reboot circuit

Pressing and releasing the BOOTLOADER button will cycle the power and start the MCU with 1k pull-up on the USB-P line. This will start the built in USB/Serial bootoader. External BOOT input is provided for triggering via DTR or other active low signal.

Take a look here for similar circuit for the CH559 series:
https://github.com/hexeguitar/CH55x-HW-reboot

Python programming script for both USB and serial port can be found here:
https://github.com/hexeguitar/CH55x_python_flasher

(c) 11.2020 by Piotr Zapart
www.hexefx.com

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