STM32 使用两个定时器(中断) 初始化出现问题。

wjfhsym

[mw_shl_code=c,true]void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//w NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //? NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // NVIC_Init(&NVIC_InitStructure); // }[/mw_shl_code]

[mw_shl_code=c,true]void TIM2_Int_Init(u16 arr,u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); // TIM_TimeBaseStructure.TIM_Period = arr; // TIM_TimeBaseStructure.TIM_Prescaler =psc; // TIM_TimeBaseStructure.TIM_ClockDivision = 0; // TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); // TIM_ClearFlag(TIM2, TIM_FLAG_Update); // TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE ); // TIM_Cmd(TIM2, ENABLE); // } void TIM2_IRQHandler(void) { if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) // { TIM_ClearITPendingBit(TIM2, TIM_IT_Update ); // Timersys.TIM2systick++; if(Timersys.TIM2systick>=6)//3s { Timersys.TIM2systick=0; Timersys.TIM2RespFlag=1;//3S } } } void TIM3_Int_Init(u16 arr,u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); // //TIM_DeInit(TIM3);//w TIM_TimeBaseStructure.TIM_Period = arr; // TIM_TimeBaseStructure.TIM_Prescaler =psc; // TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //  [/mw_shl_code] [mw_shl_code=c,true] TIM_ClearFlag(TIM3, TIM_FLAG_Update); //w TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); // TIM_Cmd(TIM3, ENABLE); // } void TIM3_IRQHandler(void) //TIM3 { static u16 SysTickadd; if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) { TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); Get_AdsData(); while(Kprocond.K1ShortDown) { Single_Segled_Ctrl(DS18B20_Get_Temp()/10); if(Timersys.TIM2RespFlag) { Timersys.TIM2RespFlag=0; break; } } } } int main(void) { RCC_Configuration(); delay_init(72); NVIC_Configuration(); TIM2_Int_Init(4999,7199); TIM3_Int_Init(49,7199); //程序执行到此处或下一行，就无法运行。如果仅一个定时器就没问题。 AdsConfig(); Key_GPIOinit(); while(1) {;} }[/mw_shl_code]

wjfhsym

问题基本找到，应该是因为定时器初始化函数 放在了AdsConfig()之前，程序执行过定时器初始化即进中断，故无法响应还没有初始化的AdsConfig();所以没法执行相关的Get_AdsData()；最好的解决方法应该是要初始化后，第一次不进入中断。参考http://www.openedv.com/posts/list/38198.htm