void TIM3_PWMINPUT_INIT(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM3_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //open TIM3 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //open gpioA clock
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //GPIO??
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr; //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂʼþ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔؼĴæÆ÷ÖÜÆÚµÄÖµ ¼ÆÊýµ½5000Ϊ500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //ÉèÖÃÓÃÀ´×÷ΪTIMxʱÖÓƵÂʳýÊýµÄÔ¤·ÖƵֵ 10KhzµÄ¼ÆÊýƵÂÊ
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIMÏòÉϼÆÊýģʽ
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾ÝTIM_TimeBaseInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯TIMxµÄʱ¼ä»ùÊýµ¥Î»
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM3_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM3_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM3, &TIM3_ICInitStructure);
TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
TIM_Cmd(TIM3, ENABLE);
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
}
u16 IC2Value = 0,DutyCycle = 0,Frequency = 0;
void TIM3_IRQHandler(void)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_CC2); /?TIM???????
IC2Value = TIM_GetCapture2(TIM3); /?IC2???????,??PWM??????
if (IC2Value != 0)
{
DutyCycle = TIM_GetCapture1(TIM3);
Frequency = IC2Value; /?PWM???
}
else
{
DutyCycle = 0;
Frequency = 0;
}
}
大家帮我看下这个代码
这个是STM32的PWM输入
为什么DutyCycle 一直都是0啊 |
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