又来麻烦大家了，定时器2通道2捕获的问题

jhqcumt · 发表于 2015-6-8 09:59:57

前三个超声波测距分别使用定时器5通道1，定时器4通道1，定时器3通道1，均可同时正常工作。现在再加了一个定时器2通道2，一直出现问题，希望大神指正错误，谢谢大家~

[mw_shl_code=c,true]//定时器2通道2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_1; //PA1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA1 GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_ResetBits(GPIOA,GPIO_Pin_1);//PA1下拉 //初始化定时器 TIM2 TIM_TimeBaseStructure.TIM_Period = arr; // TIM_TimeBaseStructure.TIM_Prescaler =psc; // TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); // //初始化TIM2输入捕获参数 TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC1S=01 TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; // TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; // TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; // TIM2_ICInitStructure.TIM_ICFilter = 0x00;// TIM_ICInit(TIM2, &TIM2_ICInitStructure); //中断分组初始化 NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // NVIC_Init(&NVIC_InitStructure); // TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC2,ENABLE);// TIM_Cmd(TIM2,ENABLE ); //使能定时器2 } u8 TIM2CH2_CAPTURE_STA=0; // u16 TIM2CH2_CAPTURE_VAL; // //定时器2中断服务程序 void TIM2_IRQHandler(void) { if((TIM2CH2_CAPTURE_STA&0X80)==0)// { if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) { if(TIM2CH2_CAPTURE_STA&0X40)// { if((TIM2CH2_CAPTURE_STA&0X3F)==0X3F)// { TIM2CH2_CAPTURE_STA|=0X80;// TIM2CH2_CAPTURE_VAL=0XFFFF; }else TIM2CH2_CAPTURE_STA++; } } if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)// { if(TIM2CH2_CAPTURE_STA&0X40) // { TIM2CH2_CAPTURE_STA|=0X80; // TIM2CH2_CAPTURE_VAL=TIM_GetCapture2(TIM2); TIM_OC2PolarityConfig(TIM2,TIM_ICPolarity_Rising); // }else // { TIM2CH2_CAPTURE_STA=0; // TIM2CH2_CAPTURE_VAL=0; TIM_SetCounter(TIM2,0); TIM2CH2_CAPTURE_STA|=0X40; // TIM_OC2PolarityConfig(TIM2,TIM_ICPolarity_Falling); // } } } TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //清楚中断标志位 } [/mw_shl_code]

以上是定时器2通道2配置，按照原子哥定时器5通道1所改

[mw_shl_code=c,true] Trig3=1; delay_us(15); Trig3=0; if(TIM2CH2_CAPTURE_STA&0X80)// { temp3=TIM2CH2_CAPTURE_STA&0X3F; temp3*=65536;// temp3+=TIM2CH2_CAPTURE_VAL;// temp3=(float)temp3*0.017*1.0244+2.689; TIM2CH2_CAPTURE_STA=0;//[/mw_shl_code]

这个是第四个超声波模块主程序部分，Trig3端使用的是PA3口

[mw_shl_code=c,true]void Trig3_10us_IO_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_ResetBits(GPIOA,GPIO_Pin_3);[/mw_shl_code]

PA3口定义，用来产生高电平触发