【STM32】PWM 输出 (标准库)

 typedef struct {   
 	 uint16_t TIM_Prescaler;          // 预分频器   
	 uint16_t TIM_CounterMode;        // 计数模式   
	 uint32_t TIM_Period;             // 定时器周期   
 	 uint16_t TIM_ClockDivision;      // 时钟分频  
	 uint8_t TIM_RepetitionCounter;   // 重复计算器  
 } 	TIM_TimeBaseInitTypeDef; 

/** 
  * @brief  TIM Output Compare Init structure definition  
  */

typedef struct
{
  uint16_t TIM_OCMode;        /*!< Specifies the TIM mode.
                                   This parameter can be a value of @ref TIM_Output_Compare_and_PWM_modes */

  uint16_t TIM_OutputState;   /*!< Specifies the TIM Output Compare state.
                                   This parameter can be a value of @ref TIM_Output_Compare_State */

  uint16_t TIM_OutputNState;  /*!< Specifies the TIM complementary Output Compare state.
                                   This parameter can be a value of @ref TIM_Output_Compare_N_State
                                   @note This parameter is valid only for TIM1 and TIM8. */

  uint32_t TIM_Pulse;         /*!< Specifies the pulse value to be loaded into the Capture Compare Register. 
                                   This parameter can be a number between 0x0000 and 0xFFFF */

  uint16_t TIM_OCPolarity;    /*!< Specifies the output polarity.
                                   This parameter can be a value of @ref TIM_Output_Compare_Polarity */

  uint16_t TIM_OCNPolarity;   /*!< Specifies the complementary output polarity.
                                   This parameter can be a value of @ref TIM_Output_Compare_N_Polarity
                                   @note This parameter is valid only for TIM1 and TIM8. */

  uint16_t TIM_OCIdleState;   /*!< Specifies the TIM Output Compare pin state during Idle state.
                                   This parameter can be a value of @ref TIM_Output_Compare_Idle_State
                                   @note This parameter is valid only for TIM1 and TIM8. */

  uint16_t TIM_OCNIdleState;  /*!< Specifies the TIM Output Compare pin state during Idle state.
                                   This parameter can be a value of @ref TIM_Output_Compare_N_Idle_State
                                   @note This parameter is valid only for TIM1 and TIM8. */
} TIM_OCInitTypeDef;

// =============================================
# @Time    : 2020-10-24
# @Author  : AXYZdong
# @CSDN    : https://blog.csdn.net/qq_43328313
# @FileName: pwm.h
# @Software: keil5 MDK
// =============================================

#ifndef _TIME_H
#define _TIME_H

#include "stm32f4xx.h"
void TIM3_PWM_Init(u32 ARR , u32 PSC);

#endif

// =============================================
# @Time    : 2020-10-24
# @Author  : AXYZdong
# @CSDN    : https://blog.csdn.net/qq_43328313
# @FileName: pwm.c
# @Software: keil5 MDK
// =============================================

#include "pwm.h"
#include "bsp_led.h"

extern void TIM3_PWM_Init(u32 ARR , u32 PSC);

void TIM3_PWM_Init(u32 ARR , u32 PSC)
{		 					 
	//此部分需手动修改IO口设置
	
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);  	//TIM3时钟使能    
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); 	//使能PORTA时钟	
	
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_TIM3); //GPIOA6复用为定时器3
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;           //GPIOFA
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;        //复用功能
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;	//速度100MHz
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;      //推挽复用输出
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;        //上拉
	GPIO_Init(GPIOA,&GPIO_InitStructure);              //初始化PA6
	  
	TIM_TimeBaseStructure.TIM_Prescaler=PSC;  //定时器分频
	TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
	TIM_TimeBaseStructure.TIM_Period=ARR;   //自动重装载值
	TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; 
	
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);//初始化定时器3
	
	//初始化TIM14 Channel1 PWM模式	 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
 	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低
	TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1

	TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR1上的预装载寄存器
 
    TIM_ARRPreloadConfig(TIM3,ENABLE);//ARPE使能 
	
	TIM_Cmd(TIM3, ENABLE);  //使能TIM3										  
} 

// =============================================
# @Time    : 2020-10-24
# @Author  : AXYZdong
# @CSDN    : https://blog.csdn.net/qq_43328313
# @FileName: main.c
# @Software: keil5 MDK
// =============================================

#include "stm32f4xx.h"
#include "delay.h"
#include "pwm.h"
#include "bsp_led.h"

int main(void)
{
	u16 ledpwmval=0;
	u8 flag=1;
	delay_init(168); 	//初始化延时函数
  LED_GPIO_Config();     //初始化LED
  TIM3_PWM_Init(100-1,84-1); //初始化定时器
	
	while(1)
	{
		delay_ms(10);
		if(flag)ledpwmval++;
		else ledpwmval--;
		if(ledpwmval==0)flag=1;
		if(ledpwmval==40)flag=0;
		
		TIM_SetCompare1(TIM3,ledpwmval);	//修改比较值，修改占空比
 	}
}