STM32 TIM1输入捕获测试输入信号的频率

测试芯片STM32F103C8T6，外部时钟

1、输入捕获通道测试

TIM1的CH1N，无法进行输入捕获(估计是没找到其他原因，测试就也没有测试出来效果)，直接改用TIM1的CH1通道进行测试，可以进行捕获中断测试；

在用CH1的通道输入捕获配置时，必须TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;对此初始化，第一次测试发现这个参数默认是10，不知道什么原因，后来加上这句好就好了，意思代表的是多少次计数周期更新一次中断事件；

2、输入捕获中断中不要做太多事情，尽量用寄存器操作

初始配置采用的上升沿配置，在捕获中断中更改捕获中断的沿方式；

一进入捕获中断，先对TIM1->CNT = 0;，然后再是其他操作，注意操作顺序，顺序不同会导致误差不同，见代码；

3、设置的存储计数器的值，采用的变量类型是volatile，否则会导致偶尔数据不对；

4、在用串口显示测试信号的信息时，会关闭总中断，执行结束后，再打开，否则会导致偶尔数据不对；

5、实际用捕获中断进行捕获时，总会存在误差的，在此我在串口输出显示时，做了矫正处理，每个处理器不同，矫正的大小也不同，尤其在TIM1更新中断发生时，产生的误差更大；

6、用PB0（输出PWM）和PA8（检测信号频率）进行测试的

当PB0输出较低频率时，会导致TIM_Period超过65535，实际测试好像超过也没什么问题；

//
/*************************1---main函数串口信息打印********************************/while(1){if(delayFlag == 1)//定时1s{delayFlag = 0; if(IC_OccurFlag == 1){__disable_irq();CheckNoSignalCount = 0;IC_OccurFlag = 0;// LED_On_OFF();PWM_OverFlow_temp1 = PWM_OverFlow_temp11;PWM_OverFlow_temp2 = PWM_OverFlow_temp22;IC1_High_temp = IC1_High;IC1_Low_temp =  IC1_Low+81;//矫正，只需矫正这一个，高电平不用矫正printf("高电平溢出次数:%d \r\n",PWM_OverFlow_temp1);printf("低电平溢出次数:%d \r\n",PWM_OverFlow_temp2);while(PWM_OverFlow_temp1--){IC1_High_temp += (65536-5528);//矫正}while(PWM_OverFlow_temp2--){IC1_Low_temp += (65536-5528);//矫正}printf("高电平时间:%.1f us\r\n",IC1_High_temp/Calc_PWM_TimerFreq_M);printf("低电平时间:%.1f us\r\n",IC1_Low_temp/Calc_PWM_TimerFreq_M);TestPWM_Period = (float)((float)IC1_High_temp+IC1_Low_temp)/Calc_PWM_TimerFreq_M;printf("测试信号周期:%.1f us\r\n",TestPWM_Period);TestPWM_Freq =  (float)(1000000.0f)/TestPWM_Period;printf("测试信号频率:%.2f HZ\r\n",(TestPWM_Freq));printf("-----------------------------------------\r\n");IC1_High_temp = IC1_Low_temp = 0;__enable_irq();}else{if(CheckNoSignalCount++ >= 3){CheckNoSignalCount = 3;printf("没有检测到测试信号\r\n"); }}}                                                          if(EXTIFlag == 1){EXTIFlag = 0;printf("外部中断进入");}}/*************************2---PWM输出信号********************************/
#ifndef __PWM_OUT_H
#define __PWM_OUT_H
#include "stm32f10x.h"#define PWM_Out_GPIO        GPIOB
#define PWM_Out_Pin         GPIO_Pin_0
#define PWM_Out_Timer       TIM3
#define PWM_Out_TimerFreq   (u32)(72000000)
#define PWM_Out_TimerPre    (u16)(72)
#define PWM_Out_Freq        (u16)(1200)//
#define PWM_Out_TimerPeriod (u16)(PWM_Out_TimerFreq/PWM_Out_TimerPre/PWM_Out_Freq)void PWM_OUT_Config(void);
#endif#include "PWM_Out.h"void PWM_OUT_Config(void)
{TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;GPIO_InitTypeDef         GPIO_InitStructure;TIM_OCInitTypeDef        TIM_OCInitStructure;//定义结构体RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE );RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能GPIO_InitStructure.GPIO_Pin   = PWM_Out_Pin;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;   // 上拉输入GPIO_Init(PWM_Out_GPIO, &GPIO_InitStructure);TIM_TimeBaseStructure.TIM_Period        = PWM_Out_TimerPeriod; //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     计数到5000为500msTIM_TimeBaseStructure.TIM_Prescaler     = PWM_Out_TimerPre-1; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率  TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_timTIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式TIM_TimeBaseInit(PWM_Out_Timer, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//选择定时器模式，TIM脉冲宽度调制模式2TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//比较输出使能TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//输出比较极性低TIM_OC3Init(PWM_Out_Timer, &TIM_OCInitStructure);//根据结构体信息进行初始化TIM_OC3PreloadConfig(PWM_Out_Timer, TIM_OCPreload_Enable);  //使能定时器TIM2在CCR2上的预装载值TIM_Cmd(PWM_Out_Timer, ENABLE); TIM_SetCompare3(PWM_Out_Timer,(u32)PWM_Out_TimerPeriod*3/4);//得到占空比为50%的pwm波形
}/*************************3---检测信号的频率********************************/
#ifndef __CALC_PWM_H
#define __CALC_PWM_H
#include "stm32f10x.h"#define Calc_PWM_GPIO        GPIOA
#define Calc_PWM_Pin         GPIO_Pin_8
#define Calc_PWM_Timer       TIM1
#define Calc_PWM_TimerFreq   (u32)(72000000)
#define Calc_PWM_TimerFreq_M (u32)(Calc_PWM_TimerFreq/1000000)
#define Calc_PWM_TimerPre    (u16)(1)
#define Calc_PWM_Freq        (u16)(1200)//测试最小PWM频率
#define Calc_PWM_TimerPeriod (u16)(Calc_PWM_TimerFreq/Calc_PWM_TimerPre/Calc_PWM_Freq)//此值最大65535 ;833us的周期时间extern volatile float IC1_High,IC1_Low,IC1_Period;
extern volatile float IC1_High_temp,IC1_Low_temp;
extern volatile u8 IC_OccurFlag;
extern volatile u8 Control_OccurFlag;
extern volatile u16 PWM_OverFlow,PWM_OverFlow_temp1,PWM_OverFlow_temp11,PWM_OverFlow_temp2,PWM_OverFlow_temp22;
void Calc_PWM_Config(void);
#endif#include "Calc_PWM.h"volatile float IC1_High,IC1_Low,IC1_Period;
volatile float IC1_High_temp,IC1_Low_temp;
volatile u8 IC_OccurFlag;
volatile u8 Control_OccurFlag;
volatile u16 PWM_OverFlow=0,PWM_OverFlow_temp1,PWM_OverFlow_temp11,PWM_OverFlow_temp2,PWM_OverFlow_temp22;
void Calc_PWM_Config(void)
{GPIO_InitTypeDef          GPIO_InitStructure;TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure;TIM_ICInitTypeDef         TIM_ICInitStructure;NVIC_InitTypeDef          NVIC_InitStructure;TIM_OCInitTypeDef        TIM_OCInitStructure;//定义结构体RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE );GPIO_InitStructure.GPIO_Pin   = Calc_PWM_Pin;GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IN_FLOATING; //GPIO_Mode_IN_FLOATING  GPIO_Mode_Out_PP GPIO_Mode_AF_PPGPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(Calc_PWM_GPIO, &GPIO_InitStructure);TIM_TimeBaseStructure.TIM_Period    = Calc_PWM_TimerPeriod;    TIM_TimeBaseStructure.TIM_Prescaler = Calc_PWM_TimerPre-1;       TIM_TimeBaseStructure.TIM_ClockDivision = 0;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
//  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;TIM_TimeBaseInit(Calc_PWM_Timer, &TIM_TimeBaseStructure);TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;       TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;  TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;TIM_ICInitStructure.TIM_ICFilter = 0x0;TIM_PWMIConfig(Calc_PWM_Timer, &TIM_ICInitStructure);TIM_SelectInputTrigger(Calc_PWM_Timer, TIM_TS_TI1FP1);TIM_SelectSlaveMode(Calc_PWM_Timer, TIM_SlaveMode_Reset);TIM_SelectMasterSlaveMode(Calc_PWM_Timer,TIM_MasterSlaveMode_Enable);//
//  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//选择定时器模式，TIM脉冲宽度调制模式2
//  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//比较输出使能
//  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//输出比较极性低
//  TIM_OC1Init(Calc_PWM_Timer, &TIM_OCInitStructure);//根据结构体信息进行初始化
//  TIM_OC1PreloadConfig(Calc_PWM_Timer, TIM_OCPreload_Enable);  //使能定时器TIM2在CCR2上的预装载值TIM_ClearITPendingBit(Calc_PWM_Timer,TIM_IT_Update);TIM_ITConfig(Calc_PWM_Timer, TIM_IT_CC1, ENABLE);TIM_ITConfig(Calc_PWM_Timer, TIM_IT_Update, ENABLE);TIM_Cmd(Calc_PWM_Timer, ENABLE);
//  TIM_SetCompare1(Calc_PWM_Timer,Calc_PWM_TimerPeriod/3);//得到占空比为50%的pwm波形//TIM_CtrlPWMOutputs(TIM1, ENABLE);                             //pwm输出NVIC_InitStructure.NVIC_IRQChannel                    = TIM1_CC_IRQn;//捕获中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority  = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority         = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);NVIC_InitStructure.NVIC_IRQChannel                    = TIM1_UP_IRQn;//更新中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority  = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority         = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);}extern void Test_PA1_HighLow(void);
extern void Test_PA1_High(void);
extern void Test_PA1_Low(void);void TIM1_UP_IRQHandler(void)
{if(TIM_GetITStatus(Calc_PWM_Timer,TIM_IT_Update) != RESET){//Test_PA1_HighLow();TIM_ClearITPendingBit(Calc_PWM_Timer, TIM_IT_Update);PWM_OverFlow++;}}void TIM1_CC_IRQHandler(void)
{if (TIM_GetITStatus(Calc_PWM_Timer, TIM_IT_CC1) != RESET) {// Calc_PWM_Timer->SR = ~(TIM_IT_CC1);//    if(Control_OccurFlag == 1)
//    {
//      if(IC1_High>14200)//
//      {
//      Calc_PWM_Timer->CNT = 0;
//      }
//    }Calc_PWM_Timer->CNT = 0;//if(TIM1->CCER & 0X0002)//判断下降沿{//TIM_OC1PolarityConfig(Calc_PWM_Timer,TIM_OCPolarity_High);IC1_High = Calc_PWM_Timer->CCR1;//TIM_GetCapture1(Calc_PWM_Timer);PWM_OverFlow_temp11 = PWM_OverFlow;PWM_OverFlow = 0;TIM1->CCER &= 0XFFFD;IC_OccurFlag = 1;}else{// TIM_OC1PolarityConfig(Calc_PWM_Timer,TIM_OCPolarity_Low);IC1_Low = Calc_PWM_Timer->CCR1;//TIM_GetCapture1(Calc_PWM_Timer);//Calc_PWM_Timer->CNT = 0;PWM_OverFlow_temp22 = PWM_OverFlow;PWM_OverFlow = 0;TIM1->CCER |= 0X0002;}TIM_ClearITPendingBit(Calc_PWM_Timer, TIM_IT_CC1|TIM_IT_Update);////Calc_PWM_Timer->CNT = 0;//加上这句，实际测试信号周期时间偏小；}
}

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