PWM输入捕获测量频率和占空比

zimeng95 · 发表于 2014-9-1 21:33:41

[mw_shl_code=c,true]#include "pwm.h" void TIM4_PWMINPUT_INIT(u16 arr,u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; TIM_ICInitTypeDef TIM4_ICInitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler =psc; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_Up; TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); TIM4_ICInitStructure.TIM_Channel = TIM_Channel_2; TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM4_ICInitStructure.TIM_ICFilter = 0x0; [/mw_shl_code] [mw_shl_code=c,true] TIM_PWMIConfig(TIM4, &TIM4_ICInitStructure); TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2); [/mw_shl_code] [mw_shl_code=c,true] TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset); TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable); TIM_ITConfig(TIM4, TIM_IT_CC2|TIM_IT_Update, ENABLE); TIM_ClearITPendingBit(TIM4, TIM_IT_CC2|TIM_IT_Update); TIM_Cmd(TIM4, ENABLE); } u16 period = 0; u16 duty = 0; u8 CollectFlag = 1; void TIM4_IRQHandler(void) { if(CollectFlag){ if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET) { duty = TIM_GetCapture1(TIM4); //采集占空比 period=TIM_GetCapture2(TIM4); //采集周期 } CollectFlag = 0; } TIM_ClearITPendingBit(TIM4, TIM_IT_CC2|TIM_IT_Update); } [/mw_shl_code]

后面那两个 [mw_shl_code=c,true]TIM_GetCapture1[/mw_shl_code] [mw_shl_code=c,true]TIM_GetCapture2[/mw_shl_code] [mw_shl_code=c,true]不懂了[/mw_shl_code]