大侠们帮我看看我使用的 TIM1 改写原子里边TIM5 做的输入捕获低电平我有点疑惑不得不求助拉

小葫芦 · 发表于 2014-5-10 11:30:36

//定时器1通道1输入捕获配置

TIM_ICInitTypeDef TIM1_ICInitStructure;

void TIM1_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); //使能TIM1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PA8 清除之前设置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //PA8 输入
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_8); //PA8 上拉

//初始化定时器1 TIM1
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(TIM1, &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TIM1输入捕获参数
TIM1_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上
TIM1_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //下降沿捕获
TIM1_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM1_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
TIM1_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM1, &TIM1_ICInitStructure);

//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel =TIM1_CC_IRQn; //TIM1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(TIM1,TIM_IT_CC1|TIM_IT_Update,ENABLE);//允许更新中断 ,允许CC1IE捕获中断

TIM_Cmd(TIM1,ENABLE ); //使能定时器1

}

u8 TIM1CH1_CAPTURE_STA=0; //输入捕获状态
u16 TIM1CH1_CAPTURE_VAL; //输入捕获值

//定时器1中断服务程序
void TIM1_CC_IRQHandler(void)
{

if((TIM1CH1_CAPTURE_STA&0X80)==0)//还未成功捕获
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)

{
if(TIM1CH1_CAPTURE_STA&0X40)//已经捕获到低电平了
{
if((TIM1CH1_CAPTURE_STA&0X3F)==0X3F)//低电平太长了
{
TIM1CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
TIM1CH1_CAPTURE_VAL=0XFFFF;
}else TIM1CH1_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
{
if(TIM1CH1_CAPTURE_STA&0X40) //捕获到一个上升沿
{
TIM1CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
TIM1CH1_CAPTURE_VAL=TIM_GetCapture1(TIM1);
TIM_OC1PolarityConfig(TIM1,TIM_ICPolarity_Falling); //CC1P=0 设置为下降沿捕获
}else //还未开始,第一次捕获下降沿
{
TIM1CH1_CAPTURE_STA=0; //清空
TIM1CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM1,0);
// TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
TIM1CH1_CAPTURE_STA|=0X40; //标记捕获到了下降升沿
TIM_OC1PolarityConfig(TIM1,TIM_ICPolarity_Rising); //CC1P=1 设置为上升沿捕获
}
}
}

TIM_ClearITPendingBit(TIM1, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位

}

以上的是代码使用的是库函数的例程输入捕获改的 time1的的这几个中断始终没弄明白
NVIC_InitStructure.NVIC_IRQChannel =TIM1_CC_IRQn; //TIM1中断这个中断到底用哪个 TIM1_CC_IRQn? TIM1_UP_IRQn?还是其他？如果像原子那样做的话是不是需要一个捕获中断还得要个更新中断啊建立两个中断函数啊 time的那几个中断函数

tim1中断有：

TIM1_BRK_IRQHandler(void) //tim1的暂停中断

TIM1_CC_IRQHandler(void)//tim1的捕获比较中断

TIM1_TRG_COM_IRQHandler(void)//tim1的触发

TIM1_UP_IRQHandler(void)//tim1的刷新中断和通讯中断。

这是我找的一个资料里边的中断说明这几个到底用哪个啊他上面的注释对不对啊我有点迷糊往高手指点下