STM32双定时器TIM2和TIM4+8个HC-SR04超声波源程序

ID:259935 · 发表于 2020-2-25 23:31

单片机源程序如下:

#include "timer.h"
TIM_ICInitTypeDef TIM2_ICInitStructure;
TIM_ICInitTypeDef TIM4_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
//TIM2的2个通道
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入下拉
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3);
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_tim
TIM_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通道1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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM2, &TIM2_ICInitStructure);
//初始化TIM2通道1输入捕获参数
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM2, &TIM2_ICInitStructure);
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_3; //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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM2, &TIM2_ICInitStructure);
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_4; //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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM2, &TIM2_ICInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //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|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4,ENABLE);//允许更新中断 ,允许CC2IE捕获中断
TIM_Cmd(TIM2,ENABLE );
}
//*****************************************************************
//************************************************************
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GPIOA时钟
//TIM4的2个通道
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入下拉
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9);
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_tim
TIM_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通道1输入捕获参数
TIM4_ICInitStructure.TIM_Channel = TIM_Channel_1; //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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM4, &TIM4_ICInitStructure);
TIM4_ICInitStructure.TIM_Channel = TIM_Channel_2; //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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM4, &TIM4_ICInitStructure);
TIM4_ICInitStructure.TIM_Channel = TIM_Channel_3; //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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM4, &TIM4_ICInitStructure);
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 = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM4, &TIM4_ICInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //TIM4中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级2级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //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_CC1|TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4,ENABLE);//允许更新中断 ,允许CC2IE捕获中断
TIM_Cmd(TIM4,ENABLE );
}
u8 TIM2CH1_CAPTURE_STA=0; //输入捕获状态
u16 TIM2CH1_CAPTURE_VAL; //输入捕获值
u8 TIM2CH2_CAPTURE_STA=0; //输入捕获状态
u16 TIM2CH2_CAPTURE_VAL; //输入捕获值
u16 TIM2CH3_CAPTURE_VAL; //输入捕获值
u8 TIM2CH3_CAPTURE_STA=0; //输入捕获状态
u16 TIM2CH4_CAPTURE_VAL; //输入捕获值
u8 TIM2CH4_CAPTURE_STA=0; //输入捕获状态
u8 TIM4CH1_CAPTURE_STA=0; //输入捕获状态
u16 TIM4CH1_CAPTURE_VAL; //输入捕获值
u8 TIM4CH2_CAPTURE_STA=0; //输入捕获状态
u16 TIM4CH2_CAPTURE_VAL; //输入捕获值
u16 TIM4CH3_CAPTURE_VAL; //输入捕获值
u8 TIM4CH3_CAPTURE_STA=0; //输入捕获状态
u16 TIM4CH4_CAPTURE_VAL; //输入捕获值
u8 TIM4CH4_CAPTURE_STA=0; //输入捕获状态
extern u32 distan1,distan2;
extern u32 distan3,distan4;
extern u32 distan5,distan6;
extern u32 distan7,distan8;
void TIM2_IRQHandler(void)
{
if((TIM2CH1_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
if(TIM2CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM2CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM2CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM2CH1_CAPTURE_VAL=0XFFFF;
}else TIM2CH1_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{
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上升沿
TIM2CH1_CAPTURE_VAL=TIM_GetCapture1(TIM2);
distan1=TIM2CH1_CAPTURE_STA&0X3F;
distan1*=65536;//溢出时间总和
distan1+=TIM2CH1_CAPTURE_VAL;//得到总的高电平时间
distan1=340*distan1/2/10000;
TIM2CH1_CAPTURE_STA=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;
TIM_SetCounter(TIM2,0);
TIM2CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
if((TIM2CH2_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
if(TIM2CH2_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM2CH2_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM2CH2_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM2CH2_CAPTURE_VAL=0XFFFF;
}else TIM2CH2_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)//捕获1发生捕获事件
{
if(TIM2CH2_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM2CH2_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM2CH2_CAPTURE_VAL=TIM_GetCapture2(TIM2);
distan2=TIM2CH2_CAPTURE_STA&0X3F;
distan2*=65536;//溢出时间总和
distan2+=TIM2CH2_CAPTURE_VAL;//得到总的高电平时间
distan2=340*distan2/2/10000;
TIM2CH2_CAPTURE_STA=0;
TIM_OC2PolarityConfig(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
{
TIM2CH2_CAPTURE_STA=0; //清空
TIM2CH2_CAPTURE_VAL=0;
TIM_SetCounter(TIM2,0);
TIM2CH2_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC2PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
if((TIM2CH3_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
if(TIM2CH3_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM2CH3_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM2CH3_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM2CH3_CAPTURE_VAL=0XFFFF;
}else TIM2CH3_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET)//捕获1发生捕获事件
{
if(TIM2CH3_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM2CH3_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM2CH3_CAPTURE_VAL=TIM_GetCapture3(TIM2);
distan3=TIM2CH3_CAPTURE_STA&0X3F;
distan3*=65536;//溢出时间总和
distan3+=TIM2CH3_CAPTURE_VAL;//得到总的高电平时间
distan3=340*distan3/2/10000;
TIM2CH3_CAPTURE_STA=0;
TIM_OC3PolarityConfig(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
{
TIM2CH3_CAPTURE_STA=0; //清空
TIM2CH3_CAPTURE_VAL=0;
TIM_SetCounter(TIM2,0);
TIM2CH3_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC3PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
if((TIM2CH4_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
if(TIM2CH4_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM2CH4_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM2CH4_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM2CH4_CAPTURE_VAL=0XFFFF;
}else TIM2CH4_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM2, TIM_IT_CC4) != RESET)//捕获1发生捕获事件
{
if(TIM2CH4_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM2CH4_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM2CH4_CAPTURE_VAL=TIM_GetCapture4(TIM2);
distan4=TIM2CH4_CAPTURE_STA&0X3F;
distan4*=65536;//溢出时间总和
distan4+=TIM2CH4_CAPTURE_VAL;//得到总的高电平时间
distan4=340*distan4/2/10000;
TIM2CH4_CAPTURE_STA=0;
TIM_OC4PolarityConfig(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
{
TIM2CH4_CAPTURE_STA=0; //清空
TIM2CH4_CAPTURE_VAL=0;
TIM_SetCounter(TIM2,0);
TIM2CH4_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC4PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1| TIM_IT_CC2| TIM_IT_CC3| TIM_IT_CC4|TIM_IT_Update); //清除中断标志位
}
//***********************************************************************************
//***********************************************************************************
void TIM4_IRQHandler(void)
{
if((TIM4CH1_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
if(TIM4CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM4CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM4CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM4CH1_CAPTURE_VAL=0XFFFF;
}else TIM4CH1_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM4, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{
if(TIM4CH1_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM4CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM4CH1_CAPTURE_VAL=TIM_GetCapture1(TIM4);
distan5=TIM4CH1_CAPTURE_STA&0X3F;
distan5*=65536;//溢出时间总和
distan5+=TIM4CH1_CAPTURE_VAL;//得到总的高电平时间
distan5=340*distan5/2/10000;
TIM4CH1_CAPTURE_STA=0;
TIM_OC1PolarityConfig(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
{
TIM4CH1_CAPTURE_STA=0; //清空
TIM4CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM4,0);
TIM4CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC1PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
if((TIM4CH2_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
if(TIM4CH2_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM4CH2_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM4CH2_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM4CH2_CAPTURE_VAL=0XFFFF;
}else TIM4CH2_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET)//捕获1发生捕获事件
{
if(TIM4CH2_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM4CH2_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM4CH2_CAPTURE_VAL=TIM_GetCapture2(TIM4);
distan6=TIM4CH2_CAPTURE_STA&0X3F;
distan6*=65536;//溢出时间总和
distan6+=TIM4CH2_CAPTURE_VAL;//得到总的高电平时间
distan6=340*distan6/2/10000;
TIM4CH2_CAPTURE_STA=0;
TIM_OC2PolarityConfig(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
{
TIM4CH2_CAPTURE_STA=0; //清空
TIM4CH2_CAPTURE_VAL=0;
TIM_SetCounter(TIM4,0);
TIM4CH2_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC2PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
if((TIM4CH3_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
if(TIM4CH3_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM4CH3_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM4CH3_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM4CH3_CAPTURE_VAL=0XFFFF;
}else TIM4CH3_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM4, TIM_IT_CC3) != RESET)//捕获1发生捕获事件
{
if(TIM4CH3_CAPTURE_STA&0X40) //捕获到一个下降沿
{
TIM4CH3_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM4CH3_CAPTURE_VAL=TIM_GetCapture3(TIM4);
distan7=TIM4CH3_CAPTURE_STA&0X3F;
distan7*=65536;//溢出时间总和
distan7+=TIM4CH3_CAPTURE_VAL;//得到总的高电平时间
distan7=340*distan7/2/10000;
TIM4CH3_CAPTURE_STA=0;
TIM_OC3PolarityConfig(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
{
TIM4CH3_CAPTURE_STA=0; //清空
TIM4CH3_CAPTURE_VAL=0;
TIM_SetCounter(TIM4,0);
TIM4CH3_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
if((TIM4CH4_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
if(TIM4CH4_CAPTURE_STA&0X40)//已经捕获到高电平了
{
if((TIM4CH4_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
{
TIM4CH4_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM4CH4_CAPTURE_VAL=0XFFFF;
}else TIM4CH4_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM4, TIM_IT_CC4) != RESET)//捕获1发生捕获事件
{
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上升沿
TIM4CH4_CAPTURE_VAL=TIM_GetCapture4(TIM4);
distan8=TIM4CH4_CAPTURE_STA&0X3F;
distan8*=65536;//溢出时间总和
distan8+=TIM4CH4_CAPTURE_VAL;//得到总的高电平时间
distan8=340*distan8/2/10000;
TIM4CH4_CAPTURE_STA=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;
TIM_SetCounter(TIM4,0);
TIM4CH4_CAPTURE_STA|=0X40; //标记捕获到了上升沿
TIM_OC4PolarityConfig(TIM4,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
}
}
}
TIM_ClearITPendingBit(TIM4, TIM_IT_CC1| TIM_IT_CC2| TIM_IT_CC3| TIM_IT_CC4|TIM_IT_Update); //清除中断标志位
}

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TIM2和TIM4八超声波.7z (183.58 KB, 下载次数: 23)

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