本帖最后由 whc820111ylj 于 2010-3-2 11:38 编辑
我修改了一下，用TIM2作4路捕获输入。我用同一PWM信号输入到4路上（常态低电平），怎么读CCR1~CCR4的值都不一样啊？搞了好久都不知道什么问题。能帮我看一下吗？程序如下。 输入PWM频度为1K的方波。
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System Clocks Configuration */
RCC_Configuration();
/* NVIC configuration */
NVIC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
//TIM2输出初始化
TIM_TimeBaseInitStruct.TIM_Period = 9999; //周期0～FFFF
TIM_TimeBaseInitStruct.TIM_Prescaler = 5; //时钟分频
TIM_TimeBaseInitStruct.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;//模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);//基本初始化
//TIM2通道的捕捉初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1 ;//1通道选择
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising ;//上降沿
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//管脚与寄存器对应关系
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;//分频器
TIM_ICInitStructure.TIM_ICFilter = 0x4; //滤波设置，经历几个周期跳变认定波形稳定0x0～0xF
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2 ;//2通道选择
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_3 ;//3通道选择
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_4 ;//4通道选择
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2); //选择时钟触发源
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);//触发方式
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 |TIM_IT_CC3 |TIM_IT_CC4, ENABLE); //打开中断
TIM_Cmd(TIM2, ENABLE); //启动TIM2
while(1)
{}
}
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