PWM模式问题？

hnjylijunz · 发表于 2015-5-17 14:40:45

自己写一个PWM捕获小程序。通过硬件仿真后发现周期捕获是没有问题的,占空比寄存器不捕获。高手兄弟帮我解救一下这个问题？程序代码如下~

[mw_shl_code=c,true]void time2_configuration(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_ICInitTypeDef TIM_ICInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); TIM_TimeBaseStructure.TIM_Period = 50000-1; TIM_TimeBaseStructure.TIM_Prescaler = 50000-1; TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure); TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM_ICInitStructure.TIM_ICFilter = 0x0; TIM_PWMIConfig(TIM2, &TIM_ICInitStructure); TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);//输入触发源 TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset); //选择复位模式 TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);//主/从模式使能 TIM_Cmd(TIM2, ENABLE); }[/mw_shl_code]