Some resources to help you getting started with STM32 programming.
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CH341A USB conversion module equipped with CH341A chip, CH341A is a USB bus adapter chip, through the USB bus to provide asynchronous serial port, parallel port, print and 2 line and 4 line common synchronous serial interface, the module can be used for serial expansion, I2C interface EEPROM，SPI interface FLASH and STC MCU programming, program debugging, data acquisition, brush machine etc.
Function and Characteristics:
Hardware and Instructions:
Work mode (Jumper cap on the right of USB):
Output voltage of VCC and signal level selection (2 jumper cap on the left of USB):
When the 2 jumper cap is inserted into the 3V3 side is 3.3V; when the 2 jumper cap also plug to the other side is 5V.