stm32f429i-Disc PWM生成 + 输入捕获测频率与占空比

产生PWM

void My_PWM_Init(void){
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_TIM3);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽复用输出
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
	GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	

	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_Prescaler = 900-1;
	TIM_TimeBaseInitStructure.TIM_Period = 100-1;
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);
	
	
	TIM_InternalClockConfig(TIM3);
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 99;
	TIM_OC1Init(TIM3, &TIM_OCInitStructure);
	
	TIM_Cmd(TIM3,ENABLE);
}
	
void PWM_SetCompare1(uint16_t plause){
	TIM_SetCompare1(TIM3,plause);
}

void PWM_SetPrescaler(uint16_t prescaler){
	TIM_PrescalerConfig(TIM3, prescaler, TIM_PSCReloadMode_Immediate);
}

输入捕获测量频率和占空比

#include "stm32f4xx.h"                  // Device header

uint8_t first = 1, down = 0, finish = 0;
uint32_t first_cnt = 0, all_cnt = 0, high_cnt = 0;
uint8_t overflow = 0;


void Input_Capture_Init(void){
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

	TIM_InternalClockConfig(TIM1);
	TIM_TimeBaseInitTypeDef TIM_TimBaseInitStructure;
	TIM_TimBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimBaseInitStructure.TIM_Prescaler = 180-1;
	TIM_TimBaseInitStructure.TIM_Period = 65536-1;
	TIM_TimBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM1, &TIM_TimBaseInitStructure);
	
	TIM_ICInitTypeDef TIM_ICInitStructure;
	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 = 0xF;
	TIM_ICInit(TIM1, &TIM_ICInitStructure);

	TIM_ITConfig(TIM1, TIM_IT_CC1 | TIM_IT_Update, ENABLE);	

	NVIC_InitTypeDef NVIC_InitStructure; 
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);		
    NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn; 	
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;	 
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;	
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_TIM10_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;	 
	NVIC_Init(&NVIC_InitStructure);
	
	TIM_Cmd(TIM1, ENABLE);

}

void TIM1_CC_IRQHandler(void)
{
	if(down == 1){
		high_cnt = TIM_GetCapture1(TIM1) - first_cnt + overflow * 65536;
		down = 0;
		TIM_OC1PolarityConfig(TIM1,TIM_ICPolarity_Rising);	// 继续完成上升降沿捕获，测频率
	}
	else{
		if(first == 1){
			TIM_OC1PolarityConfig(TIM1,TIM_ICPolarity_Falling);	// 配置为下降沿捕获，测占空比
			down = 1;
			first_cnt = TIM_GetCapture1(TIM1);
			first = 0;
		}else{
			all_cnt = TIM_GetCapture1(TIM1) - first_cnt + overflow * 65536;
			first = 1;
			finish = 1;
		}
	}
	overflow = 0;
	TIM_ClearITPendingBit(TIM1, TIM_IT_CC1); //清除中断标志
}

void TIM1_UP_TIM10_IRQHandler(void){
	overflow ++;
	TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
}

uint8_t isFinished(void){
	return finish;
}

uint32_t Get_ALLN(void){
	return all_cnt;
}

uint32_t Get_HighN(void){
	return high_cnt;
}

main()中while循环语句:
注意，stm32f429i-Disc用于生成基准频率的TIM1定时器频率为180MHZ，在经过TIM_Prescaler = 180-1 的分频后基准频率变为1MHZ，此为Frequency中1000000的来源。

	while(1){
		uint32_t Frequency = 0;
		uint32_t Duty = 0;
		if(isFinished()){
			uint32_t ALLN = Get_ALLN();
			uint32_t HIGHN = Get_HighN();
			Frequency = (1000000)/(uint32_t)ALLN;
			Duty = Get_HighN()*100 / (uint16_t)Get_ALLN();
		}
	}