STM32F103輸出固定數量脈沖用于控制步進電機

	因為前段時間需要用STM32F103控制步進電機，所以寫了了可用于控住GPIO口輸出固定數量脈沖的函式，可直接輸入脈沖數，并且可以調節PWM的頻率（每個脈沖的周期），
	參考了網上大神的指導，我的思路是：用兩個定時器（一個用于PWM輸出，一個用于中斷PWM輸出），通過對PWM的周期和輸出時間的控制，來達到輸出固定脈沖數的目的，
	下面為主要代碼：

#include <sys.h>
#include <pwn.h>
#include <interrupt.h>
#include <step.h>
//輸出固定脈沖數量
//speed為輸出脈沖的頻率
//pulse為輸出脈沖數量
//在調脈沖頻率時，需同時調x
void pulse_putput(u16 speed, u16 pulse)
{
 	TIM2_init(pulse*10);       //設定脈沖數量（10為speed/100)
	TIM_Cmd(TIM2, ENABLE);            //使能TIM4
	TIM_ClearITPendingBit(TIM2, TIM_IT_Update);         //清除中斷標志位
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);          //使能更新中斷
	
	TIM3_PWM_Init(speed);                                 //設定PWM輸出的頻率
	
	TIM_Cmd(TIM3, ENABLE);             //使能定時器3                 
                   
}

然后就是PWM的初始化代碼(這一段是基礎的PWM初始化）

//TIM3 PWN2?·?3?ê??ˉ
//PWNê?3?3?ê??ˉ
//arr:   ×??ˉ??×°??
//psc:   ê±?ó?¤·??μ
void TIM3_PWM_Init(u16 arr)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	TIM_OCInitTypeDef TIM_OCInitStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);       //ê1?ü?¨ê±?÷3ê±?ó
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);
	
	GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);     //??ó3é?TIM3_CH2->PB5
	
	//éè????òy???a?′ó?ê?3?1|?ü￡?ê?3?TIM3 CH2μ?PWN??3?2¨D?  GPIOB.5
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;  //TIM_CH2
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;       //?′ó?í?íìê?3?
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);            //3?ê??ˉGPIO
	
	//3?ê??ˉTIM3
	TIM_TimeBaseStructure.TIM_Period = arr-1;      //éè???ú×??ˉ??×°???ü?ú?μ
	TIM_TimeBaseStructure.TIM_Prescaler = 71;     //éè???¤·??μ?μ
	TIM_TimeBaseStructure.TIM_ClockDivision = 0;   //éè??ê±?ó·???￡oTDTS = Tck_tiim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;    //TIM?òé???êy?￡ê?
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);     //3?ê??ˉTIMx
	
	//3?ê??ˉTIM3 Channel2 PWN?￡ê?
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;       //????PWN?￡ê?2
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;   //±è??ê?3?
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;       //ê?3???D???
	TIM_OC2Init(TIM3, &TIM_OCInitStructure);                        //3?ê??ˉíaéèTIM3 OC2
	
	TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
	TIM_SelectOutputTrigger(TIM4, TIM_TRGOSource_Update);
	
	TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);           //ê1?ü?¤×°????′??÷
	
	TIM_SetCompare2(TIM3, arr/4);
	TIM_Cmd(TIM3, ENABLE);                           //ê1?üTIM3
	
	
}

定時器中斷初始化

#include <interrupt.h>
#include "sys.h"


//通用定時器2中斷初始化
void TIM2_init(u16 arr)
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	
	//定時器TIM2初始化
	TIM_TimeBaseStructure.TIM_Period = arr-1;
	TIM_TimeBaseStructure.TIM_Prescaler = 7200-1;
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
	
	TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0);
	TIM_ITConfig(TIM2, TIM_IT_Update, DISABLE);
	
	//中斷優先級設定
	NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	TIM_Cmd(TIM2, ENABLE);
	
}
//定時器2中斷服務程式
void TIM2_IRQHandler(void)
{

	if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
	{

		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
		TIM_CtrlPWMOutputs(TIM3, DISABLE);
		TIM_Cmd(TIM3, DISABLE);
		TIM_Cmd(TIM2, DISABLE);
		TIM_ITConfig(TIM2, TIM_IT_Update, DISABLE);

	}
}

程式的思維圖如下
僅為個人拙見！

獻上工程檔案（KEIL,STM32F103VET6芯片）

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本人為新手，有不對的地方歡迎指正！

侵刪，謝謝