1、STM32F103

1.1、初始化函数

  1. #include "bsp_pwm.h"
  3. void BSP_PWM_INIT(uint16_t arr,uint16_t psc)
  4. {
  5.     //打开时钟
  6.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB  | RCC_APB2Periph_AFIO, ENABLE);  
  7.     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
  8.     //引脚初始化
  9.     {
  10.         GPIO_InitTypeDef GPIO_InitStructure;
  12.         GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射  TIM3_CH2->PB5    
  14.         //设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形    GPIOB.5
  15.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
  16.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
  17.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  19.         GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
  20.     }
  21.     //定时器初始化
  22.     {
  23.         TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  25.         TIM_TimeBaseStructure.TIM_Period = arr-1; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
  26.         TIM_TimeBaseStructure.TIM_Prescaler =psc-1; //设置用来作为TIMx时钟频率除数的预分频值 
  27.         TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
  28.         TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
  30.         TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
  31.     }
  32.     //PWM初始化
  33.     {
  34.         TIM_OCInitTypeDef  TIM_OCInitStructure;
  36.         TIM_OCInitStructure.TIM_OCMode      = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1
  37.         TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
  38.         TIM_OCInitStructure.TIM_OCPolarity  = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
  39.         TIM_OCInitStructure.TIM_Pulse       = 0;
  40.         TIM_OC2Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2        
  41.     }
  42.     //使能定时器和预装载值
  43.     {
  44.         TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
  45.         TIM_Cmd(TIM3, ENABLE);  //使能TIM3
  46.     }
  47. }

1.2、使用方法

2、STM32F407

2.1、初始化函数

  1. #include "bsp_pwm.h"
  3. void BSP_TIM14_PWM_INIT(uint32_t arr,uint32_t psc)
  4. {                              
  5.     //时钟打开
  6.     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14,ENABLE);      //TIM14时钟使能    
  7.     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);     //使能PORTF时钟    
  8.     //引脚初始化
  9.     {
  10.         GPIO_InitTypeDef GPIO_InitStructure;
  12.         GPIO_PinAFConfig(GPIOF,GPIO_PinSource9,GPIO_AF_TIM14); //GPIOF9复用为定时器14
  14.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;           //GPIOF9
  15.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;        //复用功能
  16.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;    //速度100MHz
  17.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;      //推挽复用输出
  18.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;        //上拉
  20.         GPIO_Init(GPIOF,&GPIO_InitStructure);              //初始化PF9
  21.     }
  22.     //定时器初始化
  23.     {
  24.         TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  26.         TIM_TimeBaseStructure.TIM_Period=arr-1;   //自动重装载值
  27.         TIM_TimeBaseStructure.TIM_Prescaler=psc-1;  //定时器分频
  28.         TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
  29.         TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; 
  31.         TIM_TimeBaseInit(TIM14,&TIM_TimeBaseStructure);//初始化定时器14
  32.     }
  33.     //PWM初始化
  34.     {
  35.         TIM_OCInitTypeDef  TIM_OCInitStructure;
  36.         //初始化TIM14 Channel1 PWM模式     
  37.         TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
  38.         TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
  39.         TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性低
  41.         TIM_OC1Init(TIM14, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 4OC1
  42.     }
  43.     //使能定时器
  44.     {
  45.         TIM_OC1PreloadConfig(TIM14, TIM_OCPreload_Enable);  //使能TIM14在CCR1上的预装载寄存器
  46.         TIM_ARRPreloadConfig(TIM14,ENABLE);//ARPE使能 
  47.         TIM_Cmd(TIM14, ENABLE);  //使能TIM14
  48.     }                                      
  49. }

2.2、使用方法