Stm32f030 is stuck with timer interrupt

1、 What happened

Initialize the timer , To configure NVIC, And then run , It's stuck .

The original code is as follows ：

// Initialize the timer 2,10ms,NVIC Set interrupt priority 
static void timer2_init(void)
{
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef 		 NVIC_InitStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	// Timer TIM2 initialization  -> 10ms
	TIM_TimeBaseStructure.TIM_Period = 99; 					// The value of the automatic reload register cycle 	
	TIM_TimeBaseStructure.TIM_Prescaler = 7199; 			// Set as TIMx Prescaled value of clock frequency divisor 
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // Set the clock split :TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//TIM Upcount mode 
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); 		// Initialize... According to the specified parameters TIMx Unit of time base 	
	
	// Interrupt priority NVIC Set up 
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; 	//TIM2 interrupt 
	NVIC_InitStructure.NVIC_IRQChannelPriority = 1; 	// priority 
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 	//IRQ The channel is energized 
	NVIC_Init(&NVIC_InitStructure);  					// initialization NVIC register 
	
	TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); 			// Enable to designate TIM2 interrupt , Allow update interrupt 
    TIM_Cmd(TIM2,ENABLE);		                        // Enable timer 
}

void TIM2_IRQHandler(void)
{
	if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET){  // Check TIM2 Whether the update interrupt occurs or not 
		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);      // eliminate TIMx Update interrupt flag  
	}
}

2、 Analyze and solve

Let's see which piece of code caused it , So first, the whole timer initialization part is commented , normal , So the problem location needs timer initialization .

Initialize the timer according to the parameters , It doesn't feel like a problem , If you write wrong, you won't get stuck ,NVIC Configuration involves interruption , So it may be the problem of interrupting this part , The comments NVIC_Init The normal , So the problem lies in the configuration of timer interrupt .

A flash of light , Thought of a mistake （ Actually, it's not hahaha ）,main There is no setting in the function NVIC grouping , And found that F030 No NVIC Grouping .

then , Search for information according to this phenomenon , Different problems lead to different solutions , In the end stay TIM_ITConfig The clear interrupt flag is added before TIM_ClearITPendingBit(TIM2, TIM_IT_Update);   , strange , I haven't met this problem before , Is it F030 Peculiar ？ If you know , generous with your criticism , thank you .

Modern code ：

// Initialize the timer 2,10ms,NVIC Set interrupt priority 
static void timer2_init(void)
{
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	NVIC_InitTypeDef 		 NVIC_InitStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	// Timer TIM2 initialization  -> 10ms
	TIM_TimeBaseStructure.TIM_Period = 99; 					// The value of the automatic reload register cycle 	
	TIM_TimeBaseStructure.TIM_Prescaler = 7199; 			// Set as TIMx Prescaled value of clock frequency divisor 
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // Set the clock split :TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//TIM Upcount mode 
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); 		// Initialize... According to the specified parameters TIMx Unit of time base 	
	
	// Interrupt priority NVIC Set up 
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; 	//TIM2 interrupt 
	NVIC_InitStructure.NVIC_IRQChannelPriority = 1; 	// priority 
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 	//IRQ The channel is energized 
	NVIC_Init(&NVIC_InitStructure);  					// initialization NVIC register 
	
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);  		// eliminate TIMx Update interrupt flag  
	TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE); 			// Enable to designate TIM2 interrupt , Allow update interrupt 
    TIM_Cmd(TIM2,ENABLE);		                        // Enable timer 
}