stm32 upgrade program solution-EEWORLD

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The STM32 chip comes with a built-in ISP program. When the chip is powered on, it will check the BOOT0 BOOT1 level status. If
BOOT0=1
BOOT1=0
, it will enter the built-in ISP program, which can basically meet the needs of program upgrades.
However, how to enter this mode is a problem. Some people on the Internet use the handshake signal of the serial port to control it, but this will exceed 3 lines (RX TX GND).
Yesterday, a method was tested. The host computer issued an instruction. After the STM32 user's own program was parsed, it used its own IO port to control a simple delay circuit to pull up BOOT0, and then the chip restarted to enter ISP. After the refresh is completed, jump into the user program to run, and the control is returned to the user program.
Set PB8 to ISP_DRV in the program, push-pull output; after a certain period of output, after the capacitor is fully charged, you can use NVIC_SystemReset() to restart (3.12 library). You can enter ISP mode.
In addition, you need to set the following vector table address in the program to enter the user program after checking the jump to user application after flash of the ISP program.
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

Tested several times and no abnormality was found.

Keywords：stm32 Reference address：stm32 upgrade program solution

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