Resets STM32F103C8 "bluepill" board into the bootloader

stm32duino-reset.py

#!/usr/bin/env python
#
# Adapted from
# https://github.com/rogerclarkmelbourne/Arduino_STM32/blob/2363e7bf8821067b78571ed16fbe397a541968a0/tools/macosx/src/upload-reset/upload-reset.c#L132

import time
import argparse
import serial


def main(port, speed=115200, wait=750):
    s = serial.Serial(port, speed)
    s.setRTS(0)
    s.setDTR(0)
    s.setDTR(1)

    time.sleep(0.05)

    s.setDTR(0)
    s.setRTS(1)
    s.setDTR(1)

    time.sleep(0.05)

    s.setDTR(0)

    time.sleep(0.05)

    s.write(b'1EAF')

    # Change wait into milliseconds
    time.sleep(wait / 1000)


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('port')
    parser.add_argument('-s', '--speed', type=int, default=115200)
    parser.add_argument('-w', '--wait', type=int, default=750)
    args = parser.parse_args()

    main(**vars(args))