使用高级定时器1和通用寄存器3同样计时30ms，可高级定时器慢了好多

z2500053109

下面是TIM1和TIM3的配置程序  求大神帮忙看看

[mw_shl_code=c,true]#include "tim5f.h" #include "stm32f10x_tim.h" #include "stm32f10x.h" //void TIM3_Int_Init(void) //{ // GPIO_InitTypeDef GPIO_InitStructure; // TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // NVIC_InitTypeDef NVIC_InitStructure; // // RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能 // // //定时器TIM3初始化 // TIM_TimeBaseStructure.TIM_Period = 719; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 // TIM_TimeBaseStructure.TIM_Prescaler =2999; //设置用来作为TIMx时钟频率除数的预分频值 // TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim // TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 // TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位 // // TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断 // // //中断优先级NVIC设置 // NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断 // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级0级 // NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //从优先级3级 // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能 // NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器 // // // TIM_Cmd(TIM3, ENABLE); //使能TIMx // // GPIO_InitStructure.GPIO_Pin =GPIO_Pin_15; // GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // GPIO_Init(GPIOA, &GPIO_InitStructure); //} ////定时器3中断服务程序 // // // //u16 testnum ; //void TIM3_IRQHandler(void) //TIM3中断 //{ // // // if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查TIM3更新中断发生与否 // { // // testnum++; // TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx更新中断标志 // // } //} // void TIM1_Int_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //时钟使能 //定时器TIM3初始化 TIM_TimeBaseStructure.TIM_Period = 719; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 TIM_TimeBaseStructure.TIM_Prescaler =2999; //设置用来作为TIMx时钟频率除数的预分频值 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位 TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断 //中断优先级NVIC设置 NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn; //TIM5中断 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级0级 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //从优先级3级 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能 NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器 TIM_ClearFlag(TIM1,TIM_FLAG_Update); //清除标志位。定时器一打开便产生更新事件，若不清除，将会进入中断 TIM_Cmd(TIM1, ENABLE); //使能TIMx } u16 testnum=0; void TIM1_UP_IRQHandler(void) //TIM1中断 { if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) //检查TIM1更新中断发生与否 { // get_ad(); testnum ++; TIM_ClearITPendingBit(TIM1, TIM_IT_Update ); //清除TIMx更新中断标志 } } //下面是主函数，就一个数码管扫描没用中断，去了数码管扫描还是慢 #include "LED.h" #include "tim5f.h" #include "sys.h" int main(void) {    SystemInit(); delay_init();     //延时函数初始化   NVIC_Configuration(); [/mw_shl_code] [mw_shl_code=c,true]LED_Init(); TIM1_Int_Init(); while(1) { displayPM(testnum); } } [/mw_shl_code]

lycreturn

应该是一样的，你是如何测试快慢的，可能你的测试方法不对

z2500053109

回复【2楼】lycreturn:
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仿真而且还下载到了实验板上 效果都很明显