如果只使用ME2全局中断，则不需要void EXTI_Config(void)//外部中断配置。只要void N_Configuration(void)//嵌套中断配置和stm32f10x_it.c库文件中的void TIM2_QHandler(void)。具体如下配置。注意此处与外部中断的配置的区别切勿混淆。
疑问？ 1.为什么不需要配置RCC_APB2Periph_AFIO 2 查看固件库手册 发现NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn; //选择外部中断3号线 与 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel; //选择TIM2中断 是结构体的不同值，怎么回事？ 3TIME2是在什么情况下促使发生了TIM2_IRQChannel; 是定时器定时满了？还是？TIM1有那么多中断方式，那么TIM2的全局中断时什么意思？ void NVIC_Configuration(void)//嵌套中断配置 { #ifdef VECT_TAB_RAM NVIC_SetVectorTable(NVIC_VectTab_RAM,0x0); #else NVIC_SetVectorTable(NVIC_VectTab_FL,0x0); #endif NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel; //选择TIM2中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能 NVIC_Init(&NVIC_InitStructure); } void TIM2_IRQHandler(void) { //U_SendData(USART2,TIM3->C); /****************此处有误，但程序尽然正常跑，趣了怪了******* while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET) { } ******/ /**************改成**********if ( TIM_GetITStatus(TIM2 , TIM_IT_Update) != RESET ) TIM_ClearITPendingBit(TIM2 , TIM_FLAG_Update);//必须清除中断标志位否则一直中断 *****************/ Delay(100000); printf("TIM3->wangwenwneCNT=%d",TIM3->CNT);//此函数已被我重定向（fputc()） } int fputc(int ch,FILE * f) { USART_SendData(USART2,(unsigned char)ch); while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET) { } return(ch); } void TIMER2_PWM_Init(void) { /****配置时间基**********/ TIM_TimeBaseStructure.TIM_Period = 0xFFFF; TIM_TimeBaseStructure.TIM_Prescaler = 0xFF;//分频 TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //时钟分割 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x03; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //模式 // TIM_OCInitStructure.TIM_Channel = TIM_Channel_1; TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; TIM_OCInitStructure.TIM_=CCR1_Val; TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low; TIM_OC1Init(TIM2,&TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Disable); /**********************/ TIM_Cmd(TIM2,ENABLE); TIM_ITConfig(TIM2,TIM_IT_CC1,ENABLE); }