stm32 has a boot pin Boot0 and Boot1, which are used to set the startup position of the code
Keywords：stm32
Reference address：STM32 development board development notes (4) - startup settings
As shown below
Boot0 is located at pin 94, which is a dedicated Boot pin. Boot1 is located at pin 37 and is multiplexed with PB2.
Boot1 Boot0
x 0: boot0 is 0, boot1 is any value, the code starts from the internal program storage area
0 1: Code starts from system storage area (ISP code area)
So by short-circuiting Boot0 to ground, you can change the startup mode by simply changing Boot1.
The current mainboard has MAX232, so use USB to serial port to connect to the mainboard, and cooperate with Flymcu software to read and erase the information, but errors will occur during burning.
FlyMcu (www.mcuisp.com)
It may be due to a problem with the extension cable or a problem with the USB to serial port. It was found that the motherboard and the burning software can only communicate when the baud rate is 115200. I don’t know why. Logically, the ISP program should be adaptive.
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