STM32F407输出多路PWM波

博主也是单片机小白，希望把自己学习经历发出来和大家一起进步。有任何问题欢迎大家提问，便于我及时回复和改正错误。

主控，淘宝黑色STM32F407板子

编译器  IAR

目标要求  输出四路PWM波

这里把写好的H和C文件给大家了，只需要在main里面简单的调用一下函数即可实现四路PWM的输出

在main里面加入

 PWM_Init（）;

 Updata_PWM_(20,200,500,600);

//即可得到2%，20%，50%，60%的PWM波

#include "PWM.h"

//  输出四路PWM波
//----------------------------2016/11/26--陈勃瑄
//  void PWM_Init(void)
//  void Updata_PWM_(float DC1,float DC2,float DC3,float DC4)
//----------------------------------------------
//  定时器：TIM4
//  输出频率：50MHz 
//  占空比   m/1000 x100%
//  自动重装载值 2000000
//  PWM管脚配置  B6~B9
void PWM_GPIO(void){
    GPIO_InitTypeDef  GPIO_InitStructure;
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_TIM4);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_TIM4);
    GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_TIM4);
}


// PWM 定时器配置
void Pwm_Init(unsigned long Frequency, uint16_t TimerPeriod, float DC1,float DC2,float DC3,float DC4)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;  
  TIM_OCInitTypeDef  TIM_OCInitStructure;   
  uint16_t Channel1Pulse = 0,Channel2Pulse = 0,Channel3Pulse = 0,Channel4Pulse = 0;
    //((1+0 )/(60*1000000))*(1+TimerPeriod )=1/f
  //TimerPeriod = (120*1000000 / (Frequency*8)) - 1; 
  Channel1Pulse = (uint16_t) (((uint32_t) DC1 * (TimerPeriod - 1)) / 1000);   
  Channel2Pulse = (uint16_t) (((uint32_t) DC2 * (TimerPeriod - 1)) / 1000); 
  Channel3Pulse = (uint16_t) (((uint32_t) DC3 * (TimerPeriod - 1)) / 1000);   
  Channel4Pulse = (uint16_t) (((uint32_t) DC4 * (TimerPeriod - 1)) / 1000);
  
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 , ENABLE);     
  
  /* Time Base configuration */  
  TIM_TimeBaseStructure.TIM_Prescaler = (84*1000000)/(TimerPeriod*Frequency)-1;      时钟预分频数
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  向上计数
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;    // 自动重装载寄存器的值
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;  
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;   重复寄存器，用于自动更新pwm占空比          
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);  
  
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;  
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;    使能该通道输出

  //第五步，死区和刹车功能配置，高级定时器才有的，通用定时器不用配置
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;    // //设置互补端输出极性
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;  使能互补端输出
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;   // //死区后输出状态??
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;  //死区后互补端输出状态??
  /* TIM1 counter enable */  
  TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;    // //设置占空比时间
  TIM_OC1Init(TIM4, &TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;    // //设置占空比时间
  TIM_OC2Init(TIM4, &TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;    // //设置占空比时间
  TIM_OC3Init(TIM4, &TIM_OCInitStructure);
  TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;    // //设置占空比时间
  TIM_OC4Init(TIM4, &TIM_OCInitStructure);
  
  TIM_Cmd(TIM4, ENABLE); 
  /* TIM1 Main Output Enable */  
  TIM_CtrlPWMOutputs(TIM4, ENABLE);  
}


//PWM占空比设置
void UpdataDuty(unsigned long Frequency,uint16_t TimerPeriod,float DC1,float DC2,float DC3,float DC4)  
{  
  TIM4->CCR1 =(int)(DC1*(TimerPeriod - 1) / 1000);
  TIM4->CCR2 =(int)(DC2*(TimerPeriod - 1) / 1000);
  TIM4->CCR3 =(int)(DC3*(TimerPeriod - 1) / 1000);
  TIM4->CCR4 =(int)(DC4*(TimerPeriod - 1) / 1000);
}
//PWM初始化
void PWM_Init(void)
{
  PWM_GPIO();
  Pwm_Init(50,1000,0,0,0,0);
}
//PWM占空比设置
void Updata_PWM_(float DC1,float DC2,float DC3,float DC4)
{
  UpdataDuty(50,1000,DC1,DC2,DC3,DC4);
}
#ifdef __cplusplus
extern "C" {
#endif
//.......................................
  
#include "stm32f4xx.h"



void PWM_Init(void);
void Updata_PWM_(float DC1,float DC2,float DC3,float DC4);
//.......................................
#endif