Interrupt callback only work when hitting debug break point

[DataD]

Hi, I was trying to implement timer interrupt on an ST32F407 Discovery board. The ST-Link on my board has been broken so I used an external ST-Link dongle and I have it connected by following this post:

https://electronics.stackexchange.com/questions/182763/how-to-use-an-external-st-link-v2-with-the-stm32f4-discovery-board 

I set up the timer so it will trigger interrupt once every 1s, but when I upload the code it does not go into interrupt. Only when I debug and put a break point in the callback function that it can execute the interrupt.

Here is a link to my code:

https://github.com/datcamap/DISCOVERYstm32.git 

Callback function

[TDK · Accepted solution]

Don't check the SR value. The callback is called when the update event happens. The update flag is already cleared when the function is called.

[DataD]

Thank you so much, this solved my problem.