Developing with Sensors Made Simple MOOC - Lab 3. After running past the first breakpoint, program stops with hard fault on line 84! void HardFault_Handler(void)

[JTrez.1]

Tried redoing the project several times - other labs seem to work

[Eleon BORLINI]

Hi @JTrez.1​ , do you refer to this section of the training? --> https://www.youtube.com/watch?v=88exXyZ6zxQ&list=PLnMKNibPkDnGsEvFISX3zEb23vLwl8qoN&index=3 can you please be more specific about the project you are referring to? Regards

[JTrez.1]

Thanks for the reply. Lab 3 is in the 7th video - Part 7: Lab 3 - LSM6DO XL embedded step counter

https://www.youtube.com/watch?v=DHt9lPjgOIk&list=PLnMKNibPkDnGsEvFISX3zEb23vLwl8qoN&index=7

Let me know if you need sections of the generated code.

[JTrez.1]

Update - I redid the Lab from scratch in a new folder with a new name and was able to get it to work. Eventually it did fail again with a hard fault on line 84! It ran again later on after disconnecting usb and restarting the debugger. I am thinking this might be a hardware issue on my board.

[JMors.1]

Can you post any of the debug error data that you are getting when the error is seen? Perhaps from the Console or Debugger Console output?

[JTrez.1]

The problem occurs intermitently now. I captured output from the debugger console when it failed:

Temporary breakpoint 1, main () at ../Core/Src/main.c:75

75    HAL_Init();

Program received signal SIGTRAP, Trace/breakpoint trap.

HardFault_Handler () at ../Core/Src/stm32l4xx_it.c:84

84   {

line 83 is: void HardFault_Handler(void)

[JMors.1]

Have you double checked that your are using interrupts [9:5] and pin PB5 for the sensor? This would be around 5:19 in the video.

[JTrez.1]

Yes - that is how it is configured. I can rerun the debugger, downloading new code and it will sometimes fail or other times run correctly. This leads me to believe there is a hardware issue causing intermittent behavior. Software always runs correctly or not :)

[JMors.1]

Yeah, strange. Were you able to complete the other labs?

I would check the connection between the NUCLEO-L476RG and X-NUCLEO-IKS01A3 boards or check for some issue like cold solder on the X-NUCLEO-IKS01A3.

However, in my case I used a NUCLEO-L152RE though.

[JTrez.1]

All of the other labs worked with no issue. I plugged and unplugged the MEMS board a few times and examined the pins. Cold solder joint is a possibility for that component. Now that I have completed the course, I am OK but will consider the one sensor suspect for future labs or experiments. Thanks for your help.