Blink User LED on Nucleo-F439ZI

ap44 · ‎2025-07-11

I want to let the user LEDs blinken, however it is not working. When I run the code the LD4(COM) is blinking red and green. after the run the LD4(COM) is red the whole time and the user LEDs do not blink. Should the LD4(COM) be lighting green?

mƎALLEm · ‎2025-07-11

Hello @ap44 and welcome to the community,

You need to share your code so we can check.

You can also inspire from this example.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

Andrew Neil · ‎2025-07-11

Welcome to the forum.

Please see How to write your question to maximize your chances to find a solution for best results.

@ap44 wrote:
When I run the code

You'll need to show the code for anyone to be able to help you with it.

See: How to insert source code for instructions.

But before that, have you tried one of the examples from CubeIDE ?

Has your Nucleo-F439ZI board been modified in any way?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

TDK · ‎2025-07-11

LD4 should be solid red when the program is running. It will be flashing during programming or while debug is active.

If you feel a post has answered your question, please click "Accept as Solution".