Hard fault STM32F3

[rachid]

Posted on August 05, 2013 at 14:58

Hello;

am using UART communication between 2 boards contaning STM32F3, the first send the same frame every 320 ms, and the second just receive this and make autobaud.after 2 minutes of working my MCU go into HARD-FAULT-HANDLER !i don't undestand why !(HARD_FAULT_STAT = 0x40000000) #stm32f3-hard_fault-uart

[Tesla DeLorean]

Posted on August 05, 2013 at 16:04

i don't undestand why !

Probably the same reason most people end up there, cause you're writing to memory you shouldn't be. Check the bounds of arrays you are writing. Use a Hard Fault handler which allows you to identify the faulting instruction, and registers at the fault.

[rachid]

Posted on August 06, 2013 at 09:02

thank you for reply,

i don't know how to do this : ''Use a Hard Fault handler which allows you to identify the faulting instruction''in my Hard Fault handler there is just an empty infinite loop, 

[frankmeyer9]

Posted on August 06, 2013 at 11:33

Using your favourite search engine, look for joseph yiu and hard fault handler. He has written nice books, covering this topic (beside others).

BTW, I guess your problem is either stack overflow, out-of-bounds array access, or a dangling pointer. I use debug output via UART at such occasions. This way, you can easily narrow down to the bug location.

[Tesla DeLorean]

Posted on August 06, 2013 at 16:49

As you can imagine this topic come up over-and-over

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http://blog.frankvh.com/2011/12/07/cortex-m3-m4-hard-fault-handler/