Did ST break SysTick in the last update? It used to work. Now it crashes because I think the interrupt vector is not set. Is this one of those known errors? How do I fix it?

[KiptonM]

When the SysTick interrupt fires the debugger quits.

I cannot figure out where the NVIC_SetVector statement is for the SysTick. I think it is not set. But I can not find the vector table in the debugger to know for sure.

This used to work, But when I updated to the 1.10.1 IDE and 6.6.1-RC2 Build.20220706-1420. It crashes when the systick interrupt happens.

I am using the STM32G051K8T

[KnarfB]

SysTick is part of the ARM core and its interrupt is enabled in SysTick_Config, see SYST_CSR register. The handler is implicitly set already in the g_pfnVectors table, see startup code and implemented in stm32g0xx_it.c. Works here on a Nucleo G071 board without issues with your tool versions.

hth

KnarfB

[KiptonM]

I tried to look at it in the debugger. it says g_pfnVectors <data variable, no debug info>

[KnarfB]

You can see the source code in the startup file, startup_stm32g071rbtx.s in my case. The startup file also has a default "do nothing" implementation of SysTick_Handler in the startup file. This "weak" declaration is overridden by SysTick_Handler in stm32g0xx_it.c.

You may check that g_pfnVectors table holds the correct handler address at the SysTick offset by inspecting memory in the debugger.

Don't think that a missing SysTick_Handler is issue.

> the debugger quits

Any output, logs? What if you step at assembly level? A fault?

hth

KnarfB

[KiptonM]

I found it in the startup_stm32g051k8tx.s and the vector table looks good.

But when I put a breakpoint in the SysTick_Handler program, the debugger crashes before I get to the interrupt there. It appears the interrupt is going somewhere weird, and crashing. I believe that is the only interrupt active and it is initialized by HAL_Init() and the system crashes shortly after HAL_Init() is executed and I am looping on __NOP(); commands. That is all that is running.

Something is wrong.

[KiptonM]

Here is my code:

int main(void)
{
  /* USER CODE BEGIN 1 */
/*
	{
		uint16_t i, j;
		for (i=0;i<525;i++)
		{
			for (j=0;j<60000;j++) __NOP();
		}
 
	}
*/
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  //SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
//  MX_GPIO_Init();
 // MX_DMA_Init();
//  MX_ADC1_Init();
//  MX_I2C1_Init();
//  MX_TIM2_Init();
//  MX_TIM3_Init();
//  MX_TIM14_Init();
//  MX_USART1_UART_Init();
//  MX_USART2_UART_Init();
 
  /* Initialize interrupts */
//  MX_NVIC_Init();
  /* USER CODE BEGIN 2 */
 
  //__disable_irq();
  /*
  ENCODER_POWER_OFF; // Make sure encoder is off so it can start correctly.
  print_debug_str("Encoder Power Off\r\n");
 
 
 
  TASK_PIN_L;
  TP2_L;
  DIO2_L;
  DIO3_L;
  DIO4_L;
 
 if (isDebug(DEBUG_verify_memory_structures))
  {
	  verify_memory_structures();
  }
*/
  __NOP();
  {
 
	  uint16_t i;
	  for (i=0;i<1000;i++)
	  {
		  __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); // 20
		  __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); // 40
		  __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); // 60
		  __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); // 80
		  __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); __NOP(); // 100
	  }
  }
  //ADC_init();
  __NOP();

I also put a breakpoint in SysTic_Handler() found in stm32g0xx_it.c but the debugger crashes before I get there.

/**
  * @brief This function handles System tick timer.
  */
void SysTick_Handler(void)
{
  /* USER CODE BEGIN SysTick_IRQn 0 */
 
  /* USER CODE END SysTick_IRQn 0 */
  HAL_IncTick();
  /* USER CODE BEGIN SysTick_IRQn 1 */
 
  /* USER CODE END SysTick_IRQn 1 */
}

[Piranha]

Open the memory view at 0x0800003C and check whether it contains the SysTick_Handler() address.

[KiptonM]

Where should I look for output logs?

It is taking a long time to step until the interrupt fires. I am still working on it. Somewhere around 155 loop iterations. No message, The debugger just stops responding I single step. .

[KiptonM]

From the .map file.

 .text.SysTick_Handler

        0x0000000008005778    0x8 ./Core/Src/stm32g0xx_it.o

        0x0000000008005778        SysTick_Handler

Why is it off by 1? 0x08005779? Should be a number divisible by 4 I would think.

It looks like all the vectors are odd numbers.

The Startup file has:

.section .isr_vector,"a",%progbits
  .type g_pfnVectors, %object
  .size g_pfnVectors, .-g_pfnVectors
 
g_pfnVectors:
  .word _estack
  .word Reset_Handler
  .word NMI_Handler
  .word HardFault_Handler
  .word 0
  .word 0
  .word 0
  .word 0
  .word 0
  .word 0
  .word 0
  .word SVC_Handler
  .word 0
  .word 0
  .word PendSV_Handler
  .word SysTick_Handler
  .word WWDG_IRQHandler                   /* Window WatchDog              */
  .word PVD_IRQHandler                    /* PVD through EXTI Line detect */
  .word RTC_TAMP_IRQHandler               /* RTC through the EXTI line    */
  .word FLASH_IRQHandler                  /* FLASH                        */
  .word RCC_IRQHandler                    /* RCC                          */
  .word EXTI0_1_IRQHandler                /* EXTI Line 0 and 1            */
  .word EXTI2_3_IRQHandler                /* EXTI Line 2 and 3            */
  .word EXTI4_15_IRQHandler               /* EXTI Line 4 to 15            */
  .word 0                                 /* reserved                     */
  .word DMA1_Channel1_IRQHandler          /* DMA1 Channel 1               */
  .word DMA1_Channel2_3_IRQHandler        /* DMA1 Channel 2 and Channel 3 */
  .word DMA1_Ch4_7_DMAMUX1_OVR_IRQHandler /* DMA1 Channel 4 to Channel 7, DMAMUX1 overrun */
  .word ADC1_COMP_IRQHandler              /* ADC1, COMP1 and COMP2        */
  .word TIM1_BRK_UP_TRG_COM_IRQHandler    /* TIM1 Break, Update, Trigger and Commutation */
  .word TIM1_CC_IRQHandler                /* TIM1 Capture Compare         */
  .word TIM2_IRQHandler                   /* TIM2                         */
  .word TIM3_IRQHandler                   /* TIM3                         */
  .word TIM6_DAC_LPTIM1_IRQHandler        /* TIM6, DAC & LPTIM1           */
  .word TIM7_LPTIM2_IRQHandler            /* TIM7 & LPTIM2                */
  .word TIM14_IRQHandler                  /* TIM14                        */
  .word TIM15_IRQHandler                  /* TIM15                        */
  .word TIM16_IRQHandler                  /* TIM16                        */
  .word TIM17_IRQHandler                  /* TIM17                        */
  .word I2C1_IRQHandler                   /* I2C1                         */
  .word I2C2_IRQHandler                   /* I2C2                         */
  .word SPI1_IRQHandler                   /* SPI1                         */
  .word SPI2_IRQHandler                   /* SPI2                         */
  .word USART1_IRQHandler                 /* USART1                       */
  .word USART2_IRQHandler                 /* USART2                       */
  .word LPUART1_IRQHandler                /* LPUART1                      */

Which looks right.

[KnarfB]

> Why is it off by 1? 0x08005779? Should be a number divisible by 4 I would think.

LSB 1 indicates thumb mode, looks correct.