进入输入捕获中断后不能返回主程序

chenaidong · 发表于 2017-3-21 13:53:23

本帖最后由 chenaidong 于 2017-3-21 14:20 编辑

我编写一段“测试PWM信号的周期及脉冲宽度”的程序，TIM3作为PWM信号输出，TIM5作为输入捕获，但进入中断后，无法返回主程序运行，求助！
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB    //使能GPIO外设时钟使能
                     | RCC_APB2Periph_AFIO, ENABLE); //使能AFIO复用功能模块时钟使能

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射  TIM3_CH2->PB5
                                                //用于 TIM3的CH2输出的PWM通过该LED显示

//设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;    //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//GPIO_WriteBit(GPIOA, GPIO_Pin_7,Bit_SET);    // PA7上拉
TIM_TimeBaseStructure.TIM_Period = arr;    //设置在下一个更新事件装入活动的自动重装载寄存器周期的值  80K
TIM_TimeBaseStructure.TIM_Prescaler =psc;    //设置用来作为TIMx时钟频率除数的预分频值  不分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0;    //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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位


TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_Pulse = 0;       //设置待装入捕获比较寄存器的脉冲值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //输出极性:TIM输出比较极性高

TIM_OC2Init(TIM3, &TIM_OCInitStructure);    //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);    //使能TIMx在CCR2上的预装载寄存器

TIM_ARRPreloadConfig(TIM3, ENABLE);    //使能TIMx在ARR上的预装载寄存器
TIM_Cmd(TIM3, ENABLE);          //使能TIMx外设
}
void TIM5_Cap_Init(u16 arr,u16 psc)
{
uint16_t tmpccmr1 = 0;
uint16_t tmpccer = 0;

TIM_ICInitTypeDef  TIM5_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);  //使能TIM5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 TIM5
TIM_TimeBaseStructure.TIM_Period = arr;    //设定计数器自动重装值 0xFFFF
TIM_TimeBaseStructure.TIM_Prescaler = psc;    //预分频器    72-1
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(TIM5, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//中断分组初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;    //TIM5中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //先占优先级3级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级3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

//初始化TIM5输入捕获参数
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1;    //CC1S=01  选择输入端 IC1映射到TI1上
TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising ;  //上升沿捕获
TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;  //CC1通道配置为输入，IC1映射到TI1上  0x0001
TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;    //配置输入分频,不分频
TIM5_ICInitStructure.TIM_ICFilter = 0x00;    //IC1F=0000 配置输入滤波器不滤波
TIM_ICInit(TIM5, &TIM5_ICInitStructure);

tmpccmr1 = TIM5->CCMR1;
tmpccer = TIM5->CCER;
//选择TIMx_CCR2的有效输入：置TIMx_CCMR1寄存器的CC2S=10(选择TI1)。
tmpccmr1 &= (uint16_t)(((uint16_t)~(uint16_t)TIM_CCMR1_CC2S));
tmpccmr1 |= 0x0200;
//选择TI1FP2的有效极性(捕获数据到TIMx_CCR2)：置CC2P=1(下降沿有效)
tmpccer &= (uint16_t)~((uint16_t)(TIM_CCER_CC2P));
tmpccer |= 0x0020;
//使能捕获：置TIMx_CCER寄存器中CC1E=1且CC2E=1
tmpccer &= (uint16_t)~((uint16_t)(TIM_CCER_CC2E));
tmpccer &= (uint16_t)~((uint16_t)(TIM_CCER_CC1E));

tmpccer |= 0x0011;

TIM5->CCMR1 = tmpccmr1;
TIM5->CCER = tmpccer;

//Select the TIM3 Input Trigger: TI2FP2
//选择有效的触发输入信号：置TIMx_SMCR寄存器中的TS=101(选择TI1FP1)
//TS[2:0]触发选择，选择同步计数器的触发输入
//TS[2:0] = 101 ，滤波后的定时输入1（TI1FP1）

TIM_SelectInputTrigger(TIM5,TIM_TS_TI1FP1);    //TIM_TS_TI1FP1 = 0x0050

//Select the slave Mode: Reset Mode
//配置从模式控制器为复位模式：置TIMx_SMCR中的SMS=100。
//SMS[2:0]从模式选择，当选择了外部信号，触发信号（TRGI）的有效边沿与选中的外部输入极性相关
//SMS[2:0] = 100 ，复位模式，选中的触发输入（TRGI）的上升沿重新初始化计数器，并产生一个更新寄存器信号
TIM_SelectSlaveMode(TIM5,TIM_SlaveMode_Reset); //TIM_SlaveMode_Reset = 0x0004

// Enable the Master/Slave Mode
//MSM，主/从模式
//MSM = 1 ，触发输入（TRGI）上的事件被延时了，以允许在当前定时器（通过TRGO）与它的从定时器间的完美同步
TIM_SelectMasterSlaveMode(TIM5,TIM_MasterSlaveMode_Enable);//TIM_MasterSlaveMode_Enable = 0x0080

TIM_ITConfig(TIM5,TIM_IT_CC1 | TIM_IT_CC2,ENABLE); //允许CC1IE、CC2IE捕获中断
TIM_Cmd(TIM5,ENABLE );          //使能定时器5
}

//定时器5中断服务程序
void TIM5_IRQHandler(void)
{
// TIM_Cmd(TIM5,DISABLE );

if(TIM_GetFlagStatus(TIM5,TIM_FLAG_CC1) == SET)
{
      TIM_ClearFlag(TIM5,TIM_FLAG_CC1);
      IC1Value = TIM_GetCapture1(TIM5) + 1;
      printf("PWM波形周期: %d；\r\n",IC1Value);

      TIM_ClearFlag(TIM5,TIM_FLAG_CC1);
}
else if(TIM_GetFlagStatus(TIM5,TIM_FLAG_CC2) == SET)
{
      TIM_ClearFlag(TIM5,TIM_FLAG_CC2);
      IC2Value = TIM_GetCapture2(TIM5) + 1;

      printf("PWM脉冲宽度: %d；\r\n",IC2Value);
      TIM_ClearFlag(TIM5,TIM_FLAG_CC2);
}
}

int main(void)
{
// u32 temp=0;
delay_init();             //延时函数初始化
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
uart_init(115200);       //串口初始化为115200

LED_Init();             //LED端口初始化

TIM3_PWM_Init(35999,1);       //8分频，PWM频率=72000000/（36000*2）=1Khz(周期1000us)
TIM_SetCompare2(TIM3,32400);    //

TIM5_Cap_Init(0XFFFF,72-1);    //以1Mhz的频率计数(1us)

while(1)
{
      delay_ms(1000);
      printf("DutyCycle: %d；IC2Value：%d !\r\n",IC1Value,IC2Value);

      LED1 = !LED1;
}
}