这是我烧录成功的画面，连接上stlink后板子的LD4是红绿交替闪烁的。烧录成功也是一样，板子没任何变化。程序是没有问题的。串口没任何输出。This is the picture of my successful burning, and the LD4 of the board flashes red and green alternately after connecting to ST-Link. The same is true for successful burning, and t...