Click the "Upload" button of the Arduino IDE, then let the development board enter burn mode:
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Hold down the download button
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Press the reset button and release
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Release the download button to enter the burn mode
Screenshot of burning success:
Note: After the firmware is burned, you need to press the reset button once before the program can run.
3. log monitoring
After burning the program, select the serial port monitor in the upper right corner
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Select the baud rate: 2000000, and then press the reset button of the development board to view the Log output.