Program stucks on Timer2 Delay.

[AKara.3]

Hello,

In my application there is an external interrupt configurations:

	RCC_ClocksTypeDef RCC_Clocks;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    EXTI_InitTypeDef EXTI_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource15);
 
	EXTI_InitStruct.EXTI_Line = EXTI_Line15;
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStruct);
	
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource14);
	EXTI_InitStruct.EXTI_Line = EXTI_Line14;
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStruct);
	
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource13);
	EXTI_InitStruct.EXTI_Line = EXTI_Line13;
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStruct);
	
	// Initialize NVIC for EXTI15_10 IRQ channel
	NVIC_InitStruct.NVIC_IRQChannel = EXTI15_10_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStruct);
	
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource8);
	EXTI_InitStruct.EXTI_Line = EXTI_Line8;
	EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
	EXTI_InitStruct.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStruct);
	
	NVIC_InitStruct.NVIC_IRQChannel = EXTI9_5_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStruct);
	
	RCC_GetClocksFreq(&RCC_Clocks);
	SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
	NVIC_SetPriority(SysTick_IRQn, 0x00);

and also I am using Timer2 to delay and Here is my delay configurations:

void delay_start(void)
{
	TIM_TimeBaseInitTypeDef TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	RCC_ClocksTypeDef RCC_Clocks;
	RCC_GetClocksFreq(&RCC_Clocks);
	TimeBaseStructure.TIM_Prescaler = (RCC_Clocks.SYSCLK_Frequency>>0)/1000000L ;
	TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TimeBaseStructure.TIM_Period = 1000 - 1;
	TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TimeBaseStructure.TIM_RepetitionCounter = 0;
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	TIM_TimeBaseInit(TIM2, &TimeBaseStructure);
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	counter_micros = 0;
	counter_millis = 0;
	TIM_SetCounter(TIM2, 0);
	countdown_millis = 0;
	TIM_Cmd(TIM2, ENABLE);
}

Of course there is a TIM2_Handler:

void TIM2_IRQHandler(void)
{
	if(TIM_GetITStatus(TIM2, TIM_IT_Update ) == SET)
	{
		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
		if(countdown_millis > 0)
		{
			countdown_millis--;
		}
		counter_micros += 1000;
		counter_millis += 1;
	}
}

My issue is when I try to run this code, program stucks on delay function. If I remove this line SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

Program runs without an issue and I do not why. Is there any one who can explain why the program stucks in delay function?

[waclawek.jan]

> stucks on delay function

What delay function? What does it mean it stuck there - single-step in disasm and observe the related registers.

> If I remove this line SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

What does this line do, exactly, what's the change in the registers it is related to? Again, you can single-step it, the "libraries" are open-source.

JW