定时器的多路捕获遇到的问题，改的原子代码，开启单个通道没有问题，俩个时捕获的频率跳动厉害。是中断的程序有问题，但不知道怎么解决。求原子哥帮顶

小小的河 · 发表于 2015-11-25 20:45:36

#include "timer.h"
#include "led.h"
#include "usart.h"
#include "delay.h"

//通用定时器中断初始化
//这里时钟选择为APB1的2倍，而APB1为36M
//arr：自动重装值。
//psc：时钟预分频数
//这里使用的是定时器4!

//定时器4通道1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);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟使能

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //PD12 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //PD12 输入
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_SetBits(GPIOD,GPIO_Pin_12); //PD12 下拉

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //PD13 清除之前设置 CO2的
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //PD13 输入
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_SetBits(GPIOD,GPIO_Pin_13); //PD13 下拉

GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //Timer4部分重映射 TIM4_CH1->

D12

//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_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);

//初始化TIM4输入捕获参数
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);

//中断分组初始化
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 = 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_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断
TIM_ITConfig(TIM4,TIM_IT_Update|TIM_IT_CC2,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

TIM_Cmd(TIM4,ENABLE ); //使能定时器4

}

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

//定时器4中断服务程序
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高电平脉宽
TIM4CH1_CAPTURE_VAL=TIM_GetCapture1(TIM4);
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高电平脉宽
TIM4CH2_CAPTURE_VAL=TIM_GetCapture2(TIM4);
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
}
}
}

TIM_ClearITPendingBit(TIM4, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位

TIM_ClearITPendingBit(TIM4, TIM_IT_CC2|TIM_IT_Update); //清除中断标志位

}

if(TIM4CH1_CAPTURE_STA&0X80)//成功捕获到了一次上升沿
{
u32 temp=0;
temp=TIM4CH1_CAPTURE_STA&0X3F;
temp*=65536;//溢出时间总和
temp+=TIM4CH1_CAPTURE_VAL;//得到总的高电平时间
temp=Get_timerhz_Average(temp,5);
temp=1/(1.92*temp*0.000001);//测试CO2的PWM时把湿度的1.92*temp*0.000001去掉

LCD_write_hanzi(1,0,4);//湿度频率
LCD_write_hanzi(3,0,5);
LCD_write_hanzi(5,0,6);
LCD_write_hanzi(7,0,7);

LCD_write_shu(6,2,temp%10); //0 频率
LCD_write_shu(5,2,temp/10%10); //0
LCD_write_shu(4,2,temp/100%10); //0
LCD_write_shu(3,2,temp/1000%10); //0

// delay_ms(20000);//延时PWM显示会不明显
TIM4CH1_CAPTURE_STA=0;//开启下一次捕获
}

if(TIM4CH2_CAPTURE_STA&0X80)//成功捕获到了一次上升沿
{
u32 temp=0;
temp=TIM4CH2_CAPTURE_STA&0X3F;
temp*=65536;//溢出时间总和
temp+=TIM4CH2_CAPTURE_VAL;//得到总的高电平时间
// temp=Get_timerhz_Average(temp,5);
// temp=1/(temp*0.000001);//测试CO2的PWM时把湿度的1.92*temp*0.000001去掉

LCD_write_shu(15,4,temp%10); //0 频率
LCD_write_shu(14,4,temp/10%10); //0
LCD_write_shu(13,4,temp/100%10); //0
LCD_write_shu(12,4,temp/1000%10); //0
LCD_write_shu(11,4,temp/10000%10); //0
LCD_write_shu(10,4,temp/100000%10); //0
LCD_write_shu(9,4,temp/1000000%10); //0


TIM4CH2_CAPTURE_STA=0;//开启下一次捕获
}