STM32Cube编程器。注册后可以在意法半导体官方网站免费下载安装文件(https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/stm32cubeprog.html) 2.以 bootloader 模式连接 STM32F042 后(BOOT0 引脚连接到 3V3),打开 Manager