PB1 pulls current to drive an LED for testing. The "led_test.hex" file in the project attachment is the LED flashing test program. BOOT0 is fixedly connected to GND. It is recommended to use the CMSIS-DAP emulator to debug and download the program. The RT9193-33GB LDO chip is used to provide 3.3V power supply for the microcontroller, with a maximum output current of 300mA.
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