Thank you.
But I met another problem.
In my controller board, I tried to download the code to flash and re-power my board, but after I re-power, the MCU does not work.
When I download the same code to the flash of my demo board in the same way, the demo board will work after I re-power.
What is the problem? Is it a problem with something called boot mode?Or something else?
This bothers me a lot.