How to download programs using the STM32 serial port (USB serial port)-EEWORLD

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1. Steps for STM32 serial port download program
1) Install "CH340 driver (USB serial port driver)_XP_WIN7 common"
2) Open the serial port download software "STM32F4 serial port download software (FLYMCU)"
3) Connect the USB interface of the development board to the USB port of the computer and power the development board
4) Set the download software as follows; click Search Serial Port, select the correct serial port number, ignore the baud rate, select the HEX file, click Start Programming to download.
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2. Hardware Connection
The wiring diagram of USB to serial port CH340 is as follows.
ARM serial port TXD is connected to the RXD pin of CH340G, and RXD is connected to the TXD pin of CH340G; CH340 is 5V powered and can be powered by USB. Boot0 is set to 1 (connected to 3.3V), and boot1 is set to 0 (grounded).
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3. Note: For the encrypted STM32 chip, you can unlock the download program through the serial port download program, and then you can use the emulator to download the program.
4. Notes on downloading programs with the serial port of STM32:
The USART of the stm32 microcontroller can only use usart1. Other USARTs are not available. Remember this. Pay attention to this when designing the circuit.
The last step is to restore the BOOT settings. Set boot0 to 0 and boot1 to 0. Be sure to restore the settings. Otherwise, the program will not run.

Keywords：STM32 Reference address：How to download programs using the STM32 serial port (USB serial port)

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