各位大神帮我分析一下程序！为什么定时器的两个通道控制的LED刚开始闪烁频率不同，过了一会马上就同时亮灭了？？？？？？？？？？？？？

HUALIN

#include "stm32f10x.h"

u16 capture=0;

u16 CCR1_Val=1000;//CH1要产生5000HZ频率的方波，则CCR1_Val=72M/(5000*2)=7200,0.1s

u16 CCR2_Val=100;//CH2要产生10Khz频率的方波，则CCR1_Val=72M/(10000*2)=3600,1s

u16 CCR3_Val=2;

u16 CCR4_Val=1;

/*TIM2 CLOCK ENABLE*/

void NVIC_Configuration(void)

{

NVIC_InitTypeDef NVIC_InitStructure;

/*Configure one bit for preemption priority */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//设置NVIC中断分组1:1位抢占优先级，1位响应优先级

NVIC_InitStructure.NVIC_IRQChannel=TIM2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

void TIM2_Configuration(void)

{

  TIM_OCInitTypeDef TIM_OCInitStructure;

  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

// TIM_ICInitTypeDef  TIM_ICInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

TIM_TimeBaseStructure.TIM_Period=10000;//计满值

TIM_TimeBaseStructure.TIM_Prescaler=7200-1;//预分频，此值加1为分频的出除数,0.0001s

//TIM_TimeBaseStructure.TIM_Prescaler=0;//不分频

TIM_TimeBaseStructure.TIM_ClockDivision=0x0;

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数

TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);

// TIM_CCxCmd(TIM2,TIM_Channel_1,)

// TIM_CCxCmd(TIM2,TIM_Channel_1, TIM_CCx);

TIM_CCxCmd(TIM2, TIM_Channel_1, TIM_CCx_Enable);

TIM_CCxCmd(TIM2, TIM_Channel_2, TIM_CCx_Enable);

TIM_CCxCmd(TIM2, TIM_Channel_3, TIM_CCx_Enable);

TIM_CCxCmd(TIM2, TIM_Channel_4, TIM_CCx_Enable);

/*比较通道1*/

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Timing;//

TIM_OCInitStructure.TIM_Pulse=CCR1_Val;//设置了待装入捕获比较寄存器的脉冲zhi

  TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//极性为正

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OC1Init(TIM2,&TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Disable);//禁止重装载

/*比较通道2*/

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Timing;

TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//极性为正

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse=CCR2_Val;

  TIM_OC2Init(TIM2,&TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Disable);

/*比较通道3*/

TIM_OCInitStructure.TIM_Pulse=CCR3_Val;

  // TIM_ICInitStructure.TIM_Channel=TIM_Channel_3;

TIM_OC3Init(TIM2,&TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM2,TIM_OCPreload_Disable);

/*比较通道4*/

TIM_OCInitStructure.TIM_Pulse=CCR4_Val;

  // TIM_ICInitStructure.TIM_Channel=TIM_Channel_4;

TIM_OC4Init(TIM2,&TIM_OCInitStructure);

TIM_OC4PreloadConfig(TIM2,TIM_OCPreload_Disable);

/*使能预装载*/

TIM_ARRPreloadConfig(TIM2,ENABLE);

/*预先清除所有中断位*/

TIM_ClearITPendingBit(TIM2,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4|TIM_IT_Update);

/*4个中断和溢出都配置中断*/

TIM_ITConfig(TIM2,TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4|TIM_IT_Update,ENABLE);

TIM_Cmd(TIM2,ENABLE);

}

void TIM2_IRQHandler(void)

{

/*TIM2_CH1*/

if(TIM_GetITStatus(TIM2,TIM_IT_CC1)!=RESET)

{

TIM_ClearITPendingBit(TIM2,TIM_IT_CC1);

/*PC.1引脚的翻转频率为  Hz*/

GPIO_WriteBit(GPIOB,GPIO_Pin_1,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_1)));

capture=TIM_GetCapture1(TIM2);

TIM_SetCompare1(TIM2,capture+CCR1_Val);

//GPIO_ResetBits(GPIOC,GPIO_Pin_All);

}

/*TIM2_CH2*/

if(TIM_GetITStatus(TIM2,TIM_IT_CC2)!=RESET)

{

GPIO_WriteBit(GPIOB,GPIO_Pin_2,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_2)));

TIM_ClearITPendingBit(TIM2,TIM_IT_CC2);

capture=TIM_GetCapture2(TIM2);

TIM_SetCompare2(TIM2,capture+CCR2_Val);

//GPIO_SetBits(GPIOC,GPIO_Pin_All); 

}

}

// void TIM2_IRQHandler(void)

// {

// u8 ReadValue;

// //检测是否发生溢出更新事件

// if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)

// {

// //清除TIM2的中断待处理位

// TIM_ClearITPendingBit(TIM2,TIM_FLAG_Update);//将PB.5管脚输出数值写入ReadValue

// ReadValue=GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_5);

// if(ReadValue==0)

// {

// GPIO_SetBits(GPIOB,GPIO_Pin_5);

// }else

//

// GPIO_ResetBits(GPIOB,GPIO_Pin_5);

// }

// }

正点原子

仿真下。

HUALIN

回复【2楼】正点原子:
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没有仿真器啊!!!有木有别的办法

正点原子

还可以软仿