STM32定时器中断进不了求指教！！

851285391@qq.co

void Tim3_Init(u16 period_num)
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
	TIM_DeInit(TIM3);
	TIM_TimeBaseStructure.TIM_Period=period_num;
	//prescaler is 1200,that is 72000000/72/500=2000Hz;
	TIM_TimeBaseStructure.TIM_Prescaler=72-1;
	//set clock division 
	TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //or TIM_CKD_DIV2 or TIM_CKD_DIV4
	//count up
	TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
	TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
	//TIM2 overflow interrupt enable
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
	//clear the TIM2 overflow interrupt flag
	TIM_ClearFlag(TIM3,TIM_FLAG_Update);
	//enable TIM2
	TIM_Cmd(TIM3,ENABLE);	 
}[/mw_shl_code]
为什么我一启动定时器，状态寄存器里的值是0x1f，无法清除！定时器有计数但却一直进不了中断！求指教啊！！[/mw_shl_code]

Beans

要对中断进行配置

void Timerx_Init(u16 arr， u16 psc)
{
RCC->APB1ENR|=1<<1;//TIM3 时钟使能
TIM3->ARR=arr; //设定计数器自动重装值//刚好 1ms
TIM3->SC=psc; //预分频器 7200，得到 10Khz 的计数时钟
//这两个东东要同时设置才可以使用中断
TIM3->DIER|=1<<0; //允许更新中断
TIM3->DIER|=1<<6; //允许触发中断
TIM3->CR1|=0x01; //使能定时器 3
 MY_NVIC_Init(1， 3， TIM3_IRQChannel， 2);//抢占 1，子优先级 3，组 2
}

851285391@qq.co

回复【2楼】Beans:
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MY_NVIC_Init这是个什么函数啊？

Beans

回复【3楼】851285391@qq.com:
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设置中断的函数，手册中有的，多看看手册

Beans

回复【3楼】851285391@qq.com:
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在sys.c文件中的

851285391@qq.co

回复【5楼】Beans:
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只是单纯的tim3中断回复【5楼】Beans:
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那要是库函数呢？
void Tim3_Init(u16 period_num)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
//?ù???è?????±?ù??±????????è???????????????è?¨?±???ù??????OC±???????
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

TIM_DeInit(TIM3);

TIM_TimeBaseStructure.TIM_Period=period_num;//×°????
//prescaler is 1200,that is 72000000/72/500=2000Hz;
TIM_TimeBaseStructure.TIM_Prescaler=72-1;//·???????
//set clock division 
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //or TIM_CKD_DIV2 or TIM_CKD_DIV4
//count up
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
//TIM2 overflow interrupt enable
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
//clear the TIM2 overflow interrupt flag
TIM_ClearFlag(TIM3,TIM_FLAG_Update);
//enable TIM2
TIM_Cmd(TIM3,ENABLE);  
}

Beans

回复【6楼】851285391@qq.com:
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只要在使用中断时，都要配置中断，cortex_M3内核中的NVIC

851285391@qq.co

回复【7楼】Beans:
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好的谢谢！

lh2008xp

跟着楼主学习了