欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

R4 STM32高级定时器笔记之PWM互补输出

程序员文章站 2022-03-13 17:18:41
...

STM32高级定时器笔记之PWM互补输出

程序功能

通过两个GPIO,输出相反的PWM信号,带死区时间和刹车控制。
PWM为50%。要配置几个寄存器:
CNT计数器
CCR输出比较寄存器器(输入捕获寄存器)
ARR自动重装载寄存器(最大65535)
当CQT开始计数(从高电平开始),小于CCR为高电平,等于CCR时跳变低电平。再计数,计数到等于ARR,计数器清零,电平反转,变为高电平。
计数器的时钟(频率)为72Mhz/psc+1
计数器的周期psc+1/72Mhz
- psc分屏因子

R4 STM32高级定时器笔记之PWM互补输出

PWM互补输出—bsp_AdvanceTim.c

高级定时器时钟挂载在RCC_APB2上,如果改为通用定时器.h里的RCC_APB2要改为RCC_APB1

#define            ADVANCE_TIM                    TIM1
#define            ADVANCE_TIM_APBxClock_FUN     RCC_APB2PeriphClockCmd
#define            ADVANCE_TIM_CLK               RCC_APB2Periph_TIM1

三个形参:

#define            ADVANCE_TIM_PERIOD            (8-1)//自动重装载寄存器,决定周期,ARR
#define            ADVANCE_TIM_PSC               (9-1)//计数器分频因子PSC
#define            ADVANCE_TIM_PULSE             4//CCR

配置GPIO

仅用于STM32F103ZET6,STM32F103RCT6:
R4 STM32高级定时器笔记之PWM互补输出
用到三个引脚:CH1-PA8 CHIN-PB13 BKIN-PB12

static void ADVANCE_TIM_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

  // 输出比较通道 GPIO 初始化
    RCC_APB2PeriphClockCmd(ADVANCE_TIM_CH1_GPIO_CLK, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  ADVANCE_TIM_CH1_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(ADVANCE_TIM_CH1_PORT, &GPIO_InitStructure);

  // 输出比较通道互补通道 GPIO 初始化
    RCC_APB2PeriphClockCmd(ADVANCE_TIM_CH1N_GPIO_CLK, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  ADVANCE_TIM_CH1N_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(ADVANCE_TIM_CH1N_PORT, &GPIO_InitStructure);

  // 输出比较通道刹车通道 GPIO 初始化
    RCC_APB2PeriphClockCmd(ADVANCE_TIM_BKIN_GPIO_CLK, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  ADVANCE_TIM_BKIN_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(ADVANCE_TIM_BKIN_PORT, &GPIO_InitStructure);
    // BKIN引脚默认先输出低电平
    GPIO_ResetBits(ADVANCE_TIM_BKIN_PORT,ADVANCE_TIM_BKIN_PIN);
}

配置高级定时器工作模式(初始化结构体)

static void ADVANCE_TIM_Mode_Config(void)
{
    //开定时器时钟,即内部时钟CK_INT=72M
    ADVANCE_TIM_APBxClock_FUN(ADVANCE_TIM_CLK,ENABLE);

/*--------------------时基结构体初始化(确定周期和计数器时钟)-----*/
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period=ADVANCE_TIM_PERIOD;//自动重装寄存器的值 
    TIM_TimeBaseStructure.TIM_Prescaler= ADVANCE_TIM_PSC;// 驱动CNT计数器的时钟= Fck_int/(psc+1)    
    TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//时钟分频因子,配置死区时用        
    TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//计数器计数模式,设置为向上计数      
    TIM_TimeBaseStructure.TIM_RepetitionCounter=0;//重复计数器的值 
    TIM_TimeBaseInit(ADVANCE_TIM, &TIM_TimeBaseStructure);//初始化定时器

    /*--------------------输出比较结构体初始化(配置PWM)--------*/       
    TIM_OCInitTypeDef  TIM_OCInitStructure;
    // 配置为PWM模式1
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    // 输出使能
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    //互补输出使能
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; 
    // 设置占空比大小
    TIM_OCInitStructure.TIM_Pulse = ADVANCE_TIM_PULSE;
    // 输出通道电平极性配置
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    // 互补输出通道电平极性配置
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    // 输出通道空闲电平极性配置
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    // 互补输出通道空闲电平极性配置
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
    TIM_OC1Init(ADVANCE_TIM, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(ADVANCE_TIM, TIM_OCPreload_Enable);

    /*-------------------刹车和死区结构体初始化-------------------*/
    //可参看BDTR寄存器描述
    TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
    // 输出比较信号死区时间配置,可参考 BDTR:UTG[7:0]描述
    // 配置的死区时间为152ns
  TIM_BDTRInitStructure.TIM_DeadTime = 11;//刹车时间
  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;//刹车是否使能
    //当BKIN引脚检测到高电平,输出比较信号被禁止,如同刹车
  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
  TIM_BDTRConfig(ADVANCE_TIM, &TIM_BDTRInitStructure);

    // 使能计数器
    TIM_Cmd(ADVANCE_TIM, ENABLE);   
    // 主输出使能,当使用通用定时器时,这句不需要
    TIM_CtrlPWMOutputs(ADVANCE_TIM, ENABLE);
}

调用上面两个函数

void ADVANCE_TIM_Init(void)
{
    ADVANCE_TIM_GPIO_Config();
    ADVANCE_TIM_Mode_Config();
}