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JCOrtiz
JCOrtiz
Associate II
August 31, 2020
Solved

FREERTOS Default CubeMX Project HardFault

  • August 31, 2020
  • 3 replies
  • 2975 views

Hi, I'm trying to execute a default CubeMX project for STM32F407 Disco with FreeRTOS. However, when I debug, it crashes with Hard Fault Handler, at the point of this function:

prvPortStartFirstTask();

So I can't start the system. I don't know why, if it's all by default.

This topic has been closed for replies.
Best answer by ZZida.1

I've the same error. I tried to debug, what should be the problem, and I found the location of error in port.c prvPortStartFirstTask() function. Unfortunately it is an assembler function. I think so it is a stack problem,:

__asm volatile(

" ldr r0, =0xE000ED08 " /* Use the NVIC offset register to locate the stack. */

" ldr r0, [r0] "

" ldr r0, [r0] "

" msr msp, r0 " /* Set the msp back to the start of the stack. */

" mov r0, #0 " /* Clear the bit that indicates the FPU is in use, see comment above. */

" msr control, r0 "

" cpsie i " /* Globally enable interrupts. */

" cpsie f "

" dsb "

" isb "

" svc 0 " /* System call to start first task. */

" nop "

);

my fw version is 1.25.0. I tried with 1.24.0 also.

And finally I found this:

https://community.st.com/s/question/0D53W00000EmtEASAZ/stm32f407gdisc1-the-project-template-doesnt-work-with-rtos-stm32cubemx-60-lib-125

and that is the solution.

3 replies

JCOrtiz
JCOrtizAuthor
Associate II
September 1, 2020

Up please. I need help with this.

Tesla DeLorean
Tesla DeLorean
Guru
September 1, 2020

>>So I can't start the system. I don't know why, if it's all by default.

Look at the processor registers and disassembly at the fault, not the C code.

Understand specifically what it is objecting too.

Use a Hard Fault handler that can output actionable data.

Most likely an address or function pointer that is incorrect.

Check task structure initialization.

Check stack pointer addresses and alignments.

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ZZida.1
ZZida.1Answer
Associate II
September 3, 2020

I've the same error. I tried to debug, what should be the problem, and I found the location of error in port.c prvPortStartFirstTask() function. Unfortunately it is an assembler function. I think so it is a stack problem,:

__asm volatile(

" ldr r0, =0xE000ED08 " /* Use the NVIC offset register to locate the stack. */

" ldr r0, [r0] "

" ldr r0, [r0] "

" msr msp, r0 " /* Set the msp back to the start of the stack. */

" mov r0, #0 " /* Clear the bit that indicates the FPU is in use, see comment above. */

" msr control, r0 "

" cpsie i " /* Globally enable interrupts. */

" cpsie f "

" dsb "

" isb "

" svc 0 " /* System call to start first task. */

" nop "

);

my fw version is 1.25.0. I tried with 1.24.0 also.

And finally I found this:

https://community.st.com/s/question/0D53W00000EmtEASAZ/stm32f407gdisc1-the-project-template-doesnt-work-with-rtos-stm32cubemx-60-lib-125

and that is the solution.

JCOrtiz
JCOrtizAuthor
Associate II
September 3, 2020

Thank you a lot!!! Thanks!!! Now it's working.:grinning_face:

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