STM32F4 Discovery program not running but ST-Link works well

[kitsooftlk]

Posted on January 18, 2015 at 09:55

Hello,

I'm really new to this STM field. I recently bought a STM32f4 Discovery board after some testing it got a issue.I'm using Keil 5 and matlab simulink for testing.At the beginning it was working well and the program which comes with the board worked well(which work as a mouse).Now I can upload the program without any error to the board and using STM utility can read the program too.But the issue is program doesn't run. I tried few blinking programs and now worked.If you have simple program that I can test please let me have it to test. If anybody experienced this before please let me knowThanksKishan #basic-debugging #stm32f4-discovery

[kitsooftlk]

Posted on January 18, 2015 at 11:15

Hello Everybody,

Today I noticed this. In the ST-Link Utility when I check LiveUpdate tick and reset program runs well. But when I uncheck LiveUpdate and reset nothing happens.When disconnected from ST-Link Utility also nothing happens.Looking for a answer....:(

[kitsooftlk]

Posted on January 18, 2015 at 14:27

Corrected the problem in a way that board can program and execute well. But I don't think this is the best solution.

As I figured out issue was with NREST which is a reset of the CPU. For normal working condition it should be tie up to VDD but here it exhibited only 2.88V.So it's obvious that there should be a leak with cap(c37). So fixed a external cap and now board is working.But I still want help from someone to figure out if this is the real issue and if this fix will not harm to the Discovery.

[Tesla DeLorean]

Posted on January 18, 2015 at 14:53

Still that voltage seems high enough to be recognized as VHI , the internal pull up is pretty weak, if the voltage is the problem, which I doubt, you could populate R37 with a 10K

There is an working example .HEX file half way down [DEAD LINK /public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM32Discovery/STM32F4DISCOVERY%2c%20can%27t%20seem%20to%20run%20anything&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=245]this thread.