Why does my STM32 program not run after an “upload complete” message?

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: Why does my STM32 program not run after an “upload complete” message?

URL: https://docs.leafony.com/en/questions/stm32-upload-run/

Description / headings (excerpt): Check the AP03 Program/Run switch, reset sequence, and upload verification log. The completion message alone can be misleading.

On AP03, change the switch position between programming and running, and reset after each change. Check this sequence:

Close the serial monitor and other apps using the same port.
Set AP03 to Program, reset it, and upload.
Check that connection, programming, and verification succeeded in the programmer’s log.
Set the switch back to Run and reset again to start the program.

Arduino IDE may show a completion message while the log contains Timeout error occured while waiting for acknowledgement. In PlatformIO, check the STM32CubeProgrammer verification result as well as SUCCESS.

See the Arduino IDE instructions or PlatformIO instructions for switch locations and log examples. If only serial output is missing, check that the monitor’s port and baud rate match your program’s Serial.begin() setting.

These steps apply to AP03. For another MCU, use that model’s upload instructions.