STM32F030PWM输入捕获

只看该作者 · 2024-3-31 11:50

void TIM3_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
uint16_t TimerPeriod;

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TimerPeriod = (SystemCoreClock / 48 ) - 1;        //精度为1us，  SystemCoreClock =48M



RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);//使能TIM3时钟

// PA6   TIM3_CH1

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;            //推挽输出模式

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;            //下拉

GPIO_Init(GPIOA, &GPIO_InitStructure);



GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1);



TIM_TimeBaseInitStructure.TIM_Prescaler =23;                //预分频器参数  计数频率 2M   定时器总线时钟  48M

TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;  // Time 定时设置为上升沿计算模式

TIM_TimeBaseInitStructure.TIM_Period = 65535;        //周期

TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;     //时钟分频     

TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;    //计数周期



TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);



TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;

TIM_ICInitStructure.TIM_ICFilter = 0x00;

TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;

TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;

TIM_PWMIConfig(TIM3,&TIM_ICInitStructure);// TIM_ICInit(TIM2,&TIM_ICInitStructure);



/*   */

TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;

TIM_ICInitStructure.TIM_ICFilter = 0x00;

TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;

TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_IndirectTI;

TIM_PWMIConfig(TIM3,&TIM_ICInitStructure);

只看该作者 · 2024-3-31 11:50

//选择输入捕获的触发信号；
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1); // TIM_TS_TI1FP1
// 选择从模式
// PWM输入模式时，从模式必须工作在复位模式，当捕获开始时，计数器CNT被复位清零；
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM3,TIM_MasterSlaveMode_Enable);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //pwm中断使能
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
NVIC_Init(&NVIC_InitStructure);

TIM_ClearITPendingBit(TIM3,TIM_IT_Update | TIM_IT_CC1); //清理中断标志
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
TIM_ITConfig(TIM3,TIM_IT_CC1,ENABLE);

TIM_ClearITPendingBit(TIM3,TIM_IT_Update | TIM_IT_CC1); //清理中断标志
TIM_Cmd(TIM3,ENABLE);

只看该作者 · 2024-3-31 11:50

}

/在定时器中断里面添加中断处理函数/
u16 cnt_tim2;
u16 cnt_tim3;
void TIM3_IRQHandler (void)
{

if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET)
{

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     TIM_ClearITPendingBit(TIM3,TIM_IT_Update);

 }



 if(TIM_GetITStatus(TIM3,TIM_IT_CC1)!=RESET)

 {

        cnt_tim2=TIM_GetCapture1(TIM3); // 周期

        cnt_tim3=TIM_GetCapture2(TIM3);// 高电平 

        TIM_ClearITPendingBit(TIM3,TIM_IT_CC1);

 }



 if(TIM_GetITStatus(TIM3,TIM_IT_CC2)!=RESET)

 {

      

       TIM_ClearITPendingBit(TIM3,TIM_IT_CC2);

 }