STM32: Code after "SysTick_Config()" isn't executed

Hi there
I had working code that I resumed working on recently and had weird behavior.
Digging into it there's something going on with the SysTick.
Just now, I put the Systick configuration at the very beginning of the main (before I first initialized my hardware class), and now in Debug mode, my "hw.init()" doesn't even get a instruction marker on the side bar. This means, that this code isn't executed at all!

Is there maybe sth I have to check in the Startup.s file? Though I cannot see, that I modified anything there.

.macro ISR_HANDLER name=
  .section .vectors, "ax"
  .word \name
  .section .init, "ax"
  .thumb_func
  .weak \name
\name:
1: b 1b /* endless loop */
.endm

.macro ISR_RESERVED
  .section .vectors, "ax"
  .word 0
.endm

  .syntax unified
  .global reset_handler

  .section .vectors, "ax"
  .code 16  
  .global _vectors  

_vectors:
  .word __stack_end__
#ifdef STARTUP_FROM_RESET
  .word reset_handler
#else
  .word reset_wait
#endif /* STARTUP_FROM_RESET */
ISR_HANDLER NMI_Handler
ISR_HANDLER HardFault_Handler
ISR_HANDLER MemManage_Handler 
ISR_HANDLER BusFault_Handler
ISR_HANDLER UsageFault_Handler
ISR_RESERVED
ISR_RESERVED
ISR_RESERVED
ISR_RESERVED
ISR_HANDLER SVC_Handler
ISR_HANDLER DebugMon_Handler
ISR_RESERVED
ISR_HANDLER PendSV_Handler
ISR_HANDLER SysTick_Handler 
#include __VECTORS
  .section .vectors, "ax"
_vectors_end:

#ifdef VECTORS_IN_RAM
  .section .vectors_ram, "ax"
_vectors_ram:
  .space _vectors_end-_vectors, 0
#endif

  .section .init, "ax"
  .thumb_func

reset_handler:

#ifndef __NO_SYSTEM_INIT
  ldr r0, =__RAM_segment_end__
  mov sp, r0
  bl SystemInit
#endif

#ifdef VECTORS_IN_RAM
  ldr r0, =__vectors_load_start__
  ldr r1, =__vectors_load_end__
  ldr r2, =_vectors_ram
l0:
  cmp r0, r1
  beq l1
  ldr r3, [r0]
  str r3, [r2]
  adds r0, r0, #4
  adds r2, r2, #4
  b l0
l1:
#endif

#if !defined(__NO_FPU) && !defined(__SOFTFP__)
  // Enable CP11 and CP10 with CPACR |= (0xf<<20)
  movw r0, 0xED88
  movt r0, 0xE000
  ldr r1, [r0]
  orrs r1, r1, #(0xf << 20)
  str r1, [r0]
#ifndef __NO_RUNFAST_MODE
  isb
  dsb
  vmrs r0, fpscr
  orrs r0, r0, #(0x3 << 24) // FZ and DN
  vmsr fpscr, r0
  // clear the CONTROL.FPCA bit
  mov r0, #0
  msr control, r0 
  // FPDSCR similarly
  movw r1, 0xEF3C
  movt r1, 0xE000
  ldr r0, [r1]
  orrs r0, r0, #(0x3 << 24) // FZ and DN
  str r0, [r1]
#endif
#endif

#ifndef __ARM_ARCH_6M__
  /* Configure vector table offset register */
  ldr r0, =0xE000ED08
#ifdef VECTORS_IN_RAM
  ldr r1, =_vectors_ram
#else
  ldr r1, =_vectors
#endif
  str r1, [r0]
#endif

  b _start

#ifndef __NO_SYSTEM_INIT
  .thumb_func
  .weak SystemInit
SystemInit:
  bx lr
#endif

#ifndef STARTUP_FROM_RESET
  .thumb_func
reset_wait:
1: b 1b /* endless loop */
#endif /* STARTUP_FROM_RESET */

Michael Johnson

June 10, 2024 07:59

It may be that the compiler is inlining this function. The breakpoint markers will be on the function if this is the case.

Johannes Hofmann

June 10, 2024 13:17

Hello Michael,
I'm not sure what you mean.
In the past I hade a related question to this Config to which you also replied.

I think I'm also struggling with the setup of my hardware. There is a "SystemInit" command, that can be omitted via preprocessor setting. Would you include or exclude it?

June 10, 2024 13:21

Does your project have a SystemInit function, if not then the default empty function will be called.

What does the hw.init() function do?

June 10, 2024 21:51

Hi Michael,
Today I learned that "SystemInit" by default is just a blank function identifier and if you need it you have to implement it by yourself. Same with "SystemCoreClockUpdate".
So as I initialize the clocks and the other hardware peripherals inside the hw.init() I don't need SystemInit.
Also now I know, that the hardware init should be called before the SystickConfig.
I also realized, that some of my source files have a "modified properties" tag on it. Maybe by accident I modified these files instead of the whole project. Do you know how I can reset these single files?

June 11, 2024 09:01

Set the Property Explorer Option | Properties Under Node, then you can delete them.

June 11, 2024 11:59

You meant under "Show Properties"?
This only expanded the project's properties, but I want to revert the settings that I made just for hardware.cpp and main.cpp

June 11, 2024 12:18

On the dropdown in the project explorer you can set it to display properties. Do this then you can use the project explorer to delete those properties.

Alternatively you can use Show Properties when the file node is selected in the project explorer and then remove the property.

STM32: Code after "SysTick_Config()" isn't executed

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