用库函数实现，用到了定时器3，可以产生可变的频率和可变的脉冲数目，用到PWM模式，通过中断后计数来实现，已测试过
贴上代码：
#ifndef _Timer_pwm_init_
#define _Timer_pwm_init_
#include<stm32f10x.h>
#include &quot;include.h&quot;
//定时器3初始化
/*stm32的定时器简介
TIM2,TIM3,TIM4,TIM5为通用定时器
TIME1,TIME8 为高级定时器
TIME6,TIME7 为基本定时器
*/
static u16 PulseCnt=0; //记录定时器溢出的次数
/***********定时器3初始化****************
实现功能：产生一定的方波数
工作模式：PWM1模式 72000000
7200：预分频系数
计数器工作频率：72000000/7200=10KHz
freq:计数器上限
换算关系：计数到freq时溢出时间为:freq*0.00001(1/10KHz)
***************************************/
//结构体申明定义
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
void Timer3_Init(u16 freq,u8 Chanl)
{
/* Compute the prescaler value */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = freq; //计数上线 500,50ms产生一次中断
TIM_TimeBaseStructure.TIM_Prescaler = 7199; //pwm时钟分频,产生10KHz的频率
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化结构体
/* PWM1 Mode configuration: Channel */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_Pulse = (freq+1)/2; //占空比为一半
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性高
if(Chanl==1) //1轴单独运动
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
}
else
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
}
if(Chanl==2) //2轴单独运动
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
}
else
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
}
if(Chanl==3) //3轴单独运动
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
}
else
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
}
if(Chanl==4) //4轴单独运动
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
}
else
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
}
if(Chanl==12) //12进行联动
{
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
}
TIM_ARRPreloadConfig(TIM3, ENABLE); //使能预装载寄存器
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //TIM2_DIER[2]=1 允许更新中断
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
}
//定时器3中断函数
//PulseCnt：脉冲计数
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET) //确认是定时器3产生中断
{
TIM3->SR = (uint16_t)~TIM_IT_Update; //清除中断标志位
PulseCnt++; //变量加加，产生了一次脉冲
}
}
/*********************************
步进电机一圈需要48个Step,被驱动8细分之后，单片机所要产生的脉冲为48X8=384个脉冲，故定时器产生八个脉冲步进电机走一步
产生指定的脉冲数
输入参数：
freq：脉冲频率
Chanl:通道
Target:设定的目标脉冲数
输出参数：无
*********************************/
void MakePulse(u16 freq,u8 Chanl,u16 TargtCnt)
{
TargtCnt=TargtCnt*8;
Timer3_Init(freq,Chanl);
TIM_Cmd(TIM3, ENABLE);//使能定时器3，开始计数
while(1)
{
if((TargtCnt+1)==PulseCnt)
{
PulseCnt=0;
TIM_Cmd(TIM3, DISABLE); //关闭定时器计数，不产生脉冲
break;
}
}
}
最后直接调用函数MakePulse就可以了 |
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