我的配置如下，但是我用信号发生器产生信号输入，根本就不进中断，但是我要是直接用导线给输入引脚引入高电平（相当于一个脉冲信号），就可以进中断，下面是我的程序，实在不明白原因！int void void ICapture_Configuration(void)
{
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
// TIM3 clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能时钟TIM3，AFIO和引脚已经使能过了
GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); //重映射
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //TIM3 CH1 重映射功能
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
/* Select the TIM3 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
/* Enable the Master/Slave Mode */
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
}
中断函数：
void TIM3_IRQHandler(void)
{
/* Clear TIM3 Capture compare interrupt pending bit */
TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
/* Get the Input Capture value */
IC2Value = TIM_GetCapture2(TIM3);
if (IC2Value != 0)
{
/* Duty cycle computation */
DutyCycle = (TIM_GetCapture1(TIM3) * 100) / IC2Value;
/* Frequency computation */
Frequency = SystemCoreClock / IC2Value;
}
else
{
DutyCycle = 0;
Frequency = 0;
}
}
并且弱弱的问一句TIM_TS_TI1FP1这个出发源是选择捕获通道1的时候就选择这个触发源吗？ |
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