stm32103R8C6 捕捉2路pwm 串口打印捕捉数据！

第一路使用定时器2的通道1，先捕捉一个上升沿，清楚所有数据开始捕捉下降沿，捕捉到下降沿后再捕捉一个上升沿。
第二路使用定时器4的通道4，使用其他通道的时候要注意，定时器的中断时CC4，设置上升沿和下降沿的时候也要改为通道4。

//定时器2通道1输入捕获配置

TIM_ICInitTypeDef TIM2_ICInitStructure;

void TIM2_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);    //使能TIM2时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIOA时钟GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0;  //PA0 清除之前设置  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入  GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_ResetBits(GPIOA,GPIO_Pin_0);                        //PA0 下拉//初始化定时器5 TIM2   TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值 TIM_TimeBaseStructure.TIM_Prescaler =psc;   //预分频器   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_timTIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位//初始化TIM2输入捕获参数TIM2_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01     选择输入端 IC1映射到TI1上TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //上升沿捕获TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;   //配置输入分频,不分频 TIM2_ICInitStructure.TIM_ICFilter = 0x01;//IC1F=0000 配置输入滤波器 不滤波TIM_ICInit(TIM2, &TIM2_ICInitStructure);//中断分组初始化NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  //TIM3中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级2级NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器 TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断    TIM_Cmd(TIM2,ENABLE );  //使能定时器2

}

u8 TIM2CH1_CAPTURE_STA=0; //输入捕获状态
u16 TIM2CH1_CAPTURE_VAL; //输入捕获高电平值
u16 TIM2CH1_LOW_CAPTURE_VAL; //输入捕获低电平值
u8 TIM2CH1_LOW_CAPTURE_STA=0;

//定时器2中断服务程序
void TIM2_IRQHandler(void)
{

if((TIM2CH1_CAPTURE_STA&0X20)==0)//还未成功捕获   {         if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)    {               if(TIM2CH1_CAPTURE_STA&0xc0)//已经捕获到高电平了        {            if((TIM2CH1_CAPTURE_STA&0X1F)==0X1F)//高电平太长了            {                TIM2CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次                TIM2CH1_CAPTURE_VAL=0XFFFF;                TIM2CH1_LOW_CAPTURE_STA|=0x80;                TIM2CH1_LOW_CAPTURE_VAL=0XFFFF;            }else             {                TIM2CH1_CAPTURE_STA++;                TIM2CH1_LOW_CAPTURE_STA++;            }        }        }if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件    {           //printf("TIM2CH1_CAPTURE_STA:     0x%x =============\r\n",TIM2CH1_CAPTURE_STA );        if(TIM2CH1_CAPTURE_STA&0x80)        //已经检测到下降沿，检测低电平时间        {            TIM2CH1_LOW_CAPTURE_VAL=TIM_GetCapture1(TIM2);                          TIM2CH1_CAPTURE_STA|=0X20;        }else                   if(TIM2CH1_CAPTURE_STA&0X40)        //捕获到一个下降沿              {                           TIM2CH1_CAPTURE_STA|=0X80;      //标记成功捕获到一次高电平脉宽            TIM2CH1_CAPTURE_VAL=TIM_GetCapture1(TIM2);            TIM_SetCounter(TIM2,0);            TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获                        }else        //还未开始,第一次捕获上升沿        {            TIM2CH1_CAPTURE_STA=0;          //清空            TIM2CH1_CAPTURE_VAL=0;            TIM2CH1_LOW_CAPTURE_VAL=0;            TIM2CH1_LOW_CAPTURE_STA=0;            TIM_SetCounter(TIM2,0);            TIM2CH1_CAPTURE_STA|=0X40;      //标记捕获到了上升沿            TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling);     //c  设置为下降沿捕获            //TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising);        //CC1P=1 设置为上升沿捕获        }               }                                              }TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位

}

===========================================================================

//定时器4通道4输入捕获配置

TIM_ICInitTypeDef TIM4_ICInitStructure;

void TIM4_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);    //使能TIM4时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);  //使能GPIOB时钟GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_9;  //PB9 清除之前设置  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PB9 输入  GPIO_Init(GPIOB, &GPIO_InitStructure);GPIO_ResetBits(GPIOB,GPIO_Pin_9);                        //PB9 下拉//初始化定时器4 TIM4   TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值 TIM_TimeBaseStructure.TIM_Prescaler =psc;   //预分频器   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_timTIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位//初始化TIM4输入捕获参数TIM4_ICInitStructure.TIM_Channel = TIM_Channel_4; //CC1S=01     选择输入端 IC1映射到TI1上TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //上升沿捕获TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;   //配置输入分频,不分频 TIM4_ICInitStructure.TIM_ICFilter = 0x01;//IC1F=0000 配置输入滤波器 不滤波TIM_ICInit(TIM4, &TIM4_ICInitStructure);//中断分组初始化NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;  //TIM3中断NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;  //先占优先级2级NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器 TIM_ITConfig(TIM4,TIM_IT_Update|TIM_IT_CC4,ENABLE);//允许更新中断 ,允许CC1IE捕获中断    TIM_Cmd(TIM4,ENABLE );  //使能定时器2

}

u8 TIM4CH4_CAPTURE_STA=0; //输入捕获状态
u16 TIM4CH4_CAPTURE_VAL; //输入捕获高电平值
u16 TIM4CH4_LOW_CAPTURE_VAL; //输入捕获低电平值
u8 TIM4CH4_LOW_CAPTURE_STA=0;

//定时器4中断服务程序
void TIM4_IRQHandler(void)
{

if((TIM4CH4_CAPTURE_STA&0X20)==0)//还未成功捕获   {         if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)    {               if(TIM4CH4_CAPTURE_STA&0xc0)//已经捕获到高电平了        {            if((TIM4CH4_CAPTURE_STA&0X1F)==0X1F)//高电平太长了            {                TIM4CH4_CAPTURE_STA|=0X80;//标记成功捕获了一次                TIM4CH4_CAPTURE_VAL=0XFFFF;                TIM4CH4_LOW_CAPTURE_STA|=0x80;                TIM4CH4_LOW_CAPTURE_VAL=0XFFFF;            }else             {                TIM4CH4_CAPTURE_STA++;                TIM4CH4_LOW_CAPTURE_STA++;            }        }        }if (TIM_GetITStatus(TIM4, TIM_IT_CC4) != RESET)//捕获1发生捕获事件    {           //printf("TIM4CH4_CAPTURE_STA:     0x%x =============\r\n",TIM4CH4_CAPTURE_STA );        if(TIM4CH4_CAPTURE_STA&0x80)        //已经检测到下降沿，检测低电平时间        {            TIM4CH4_LOW_CAPTURE_VAL=TIM_GetCapture4(TIM4);                          TIM4CH4_CAPTURE_STA|=0X20;        }else                   if(TIM4CH4_CAPTURE_STA&0X40)        //捕获到一个下降沿              {                           TIM4CH4_CAPTURE_STA|=0X80;      //标记成功捕获到一次高电平脉宽            TIM4CH4_CAPTURE_VAL=TIM_GetCapture4(TIM4);            TIM_SetCounter(TIM4,0);            TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获                        }else        //还未开始,第一次捕获上升沿        {            TIM4CH4_CAPTURE_STA=0;          //清空            TIM4CH4_CAPTURE_VAL=0;            TIM4CH4_LOW_CAPTURE_VAL=0;            TIM4CH4_LOW_CAPTURE_STA=0;            TIM_SetCounter(TIM4,0);            TIM4CH4_CAPTURE_STA|=0X40;      //标记捕获到了上升沿            TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Falling);     //c  设置为下降沿捕获            //TIM_OC1PolarityConfig(TIM4,TIM_ICPolarity_Rising);        //CC1P=1 设置为上升沿捕获        }               }                                              }TIM_ClearITPendingBit(TIM4, TIM_IT_CC4|TIM_IT_Update); //清除中断标志位

}

初始化和计算频率及占空比等因为都一样，就贴一个吧。

TIM2_Cap_Init(0XFFFF,9-1);  //以8Mhz的频率计数     if(TIM2CH1_CAPTURE_STA&0X20)//成功捕获到了一次上升沿    {        highTemp=TIM2CH1_CAPTURE_STA&0X1F;        highTemp*=65536;//溢出时间总和        highTemp+=TIM2CH1_CAPTURE_VAL;//得到总的高电平时间        lowTemp=TIM2CH1_LOW_CAPTURE_STA&0X1F;        lowTemp*=65536;//溢出时间总和        lowTemp+=TIM2CH1_LOW_CAPTURE_VAL;//得到总的低电平时间        ch1.cyc = (highTemp+lowTemp)/8;        ch1.fre = 1000*1000/(float)(ch1.cyc);        ch1.duty = highTemp/8*100/(float)(ch1.cyc);        printf("11111 cycle: %d us   fre: %0.1f Hz   high duty: %0.1f %%\r\n",ch1.cyc,ch1.fre,ch1.duty);//打印总的高点平时间        TIM2CH1_CAPTURE_STA=0;//开启下一次捕获        //updateDisplay();    }