STM32F103 TIM1 PWM

2021-12-29 17:33:53 阅读：229 来源： 互联网

标签：STM32F103 TIM3 TIM1 TIM OCInitStructure GPIO PWM

使用不同版本的标准库导致了不同的现象，内部晶振最大64M所以分频是64'000'000/64 = 1'000'000;周期定为1000；则可以生成1kz的pwm，占空比0‰到1000‰

void TIM1_PWM(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;

  /*开时钟PWM的 与GPIO的*/
  RCC_APB2PeriphClockCmd (RCC_APB2Periph_TIM1,ENABLE);
  RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOA, ENABLE);
    
  /* PA8设置为功能脚（PWM） */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init (GPIOA, &GPIO_InitStructure);

  TIM_DeInit (TIM1);//重设为缺省值

  /*TIM1时钟配置*/
  TIM_TimeBaseStructure.TIM_Prescaler = 64;//预分频（时钟分频）64M/4000=18K
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
  TIM_TimeBaseStructure.TIM_Period = 1000-1;//装载值
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//设置了时钟分割
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;//周期计数器值
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);//初始化TIMx的时间基数单位

  /* Channel 1 Configuration in PWM mode 通道一的PWM*/
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//正向通道PA8
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道PB13
  TIM_OCInitStructure.TIM_Pulse = 500; //占空时间 1000 中有500的时间为高，互补的输出正好相反
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互补端的极性
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//空闲状态下的非工作状态
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  /* TIM1 counter enable开定时器 */
  TIM_Cmd (TIM1, ENABLE);
  /* TIM1 Main Output Enable 使能TIM1外设的主输出*/
  TIM_CtrlPWMOutputs (TIM1, ENABLE);
}

使用uCOS的时候由于是修改官方uCOS例程文件，其使用的是2008年的 V2.0的库

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

这两句代码貌似必须要加上

而使用2011年的V3.5.0的库就不用加

TIM_SetCompare1(TIM1, 0);//使用这个修改占空比

做个记录

附带TIM3 PWM设置 TIM4和TIM3类似

/***************************************************************Author:Liming***
  * @brief  TIM3_GPIO_Config
  * @param  None
  * @retval None
*****************************************************************0X49E7FC7B****/
static void TIM3_GPIO_Config(void)
 {  
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  | RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟使能     
    //TIM3_CH1-TIM3_CH2的PWM的GPIO
    GPIO_InitStructure.GPIO_Pin  =  GPIO_Pin_6 | GPIO_Pin_7 ;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;      //复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50MHZ
    GPIO_Init(GPIOA, &GPIO_InitStructure);
     
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB  | RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟使能     
    //TIM3_CH3-TIM3_CH4的PWM的GPIO
    GPIO_InitStructure.GPIO_Pin  =  GPIO_Pin_0 | GPIO_Pin_1 ;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;      //复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50MHZ
    GPIO_Init(GPIOB, &GPIO_InitStructure); 
 }
 
 
/***************************************************************Author:Liming***
  * @brief  TIM3_Mode_Config
  * @param  None
  * @retval None
*****************************************************************0X49E7FC7B****/
static void TIM3_Mode_Config(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    /* PWM信号电平跳变值 */

    u16 CCR1_Val=0; 
    u16 CCR2_Val=0;
    u16 CCR3_Val=0;
    u16 CCR4_Val=0;
    /* -----------------------------------------------------------------------
    TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
    TIM3CLK = 64 MHz, Prescaler = 0x0, TIM3 counter clock = 64 MHz
    TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
    TIM3 Frequency = 64 KHz.
    TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
    TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
    TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
    TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
    ----------------------------------------------------------------------- */

    /* Time base configuration */    
    TIM_TimeBaseStructure.TIM_Period = TIM_PERIOD; //当定时器从0计数到999，即为1000次，为一个定时周期
    TIM_TimeBaseStructure.TIM_Prescaler = 5;    //设置预分频：不预分频，即为64MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;    //设置时钟分频系数：不分频
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式

    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    /* PWM1 Mode configuration: Channel1 */
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;    //配置为PWM模式1
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;    
    TIM_OCInitStructure.TIM_Pulse = CCR1_Val;    //设置跳变值，当计数器计数到这个值时，电平发生跳变
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //当定时器计数值小于CCR1_Val时为高电平

    TIM_OC1Init(TIM3, &TIM_OCInitStructure);    //使能通道1

    TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

    /* PWM1 Mode configuration: Channel2 */
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR2_Val; //设置通道2的电平跳变值，输出另外一个占空比的PWM

    TIM_OC2Init(TIM3, &TIM_OCInitStructure);    //使能通道2

    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

    /* PWM1 Mode configuration: Channel3 */
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR3_Val;    //设置通道3的电平跳变值，输出另外一个占空比的PWM

    TIM_OC3Init(TIM3, &TIM_OCInitStructure);    //使能通道3

    TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

    /* PWM1 Mode configuration: Channel4 */
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR4_Val;    //设置通道4的电平跳变值，输出另外一个占空比的PWM

    TIM_OC4Init(TIM3, &TIM_OCInitStructure);    //使能通道4

    TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

    TIM_ARRPreloadConfig(TIM3, ENABLE);    // 使能TIM3重载寄存器ARR

    /* TIM3 enable counter */
    TIM_Cmd(TIM3, ENABLE); //使能定时器3    
}

修改占空比方式跟TIM1一样

标签：STM32F103,TIM3,TIM1,TIM,OCInitStructure,GPIO,PWM
来源： https://www.cnblogs.com/IdeaMing/p/15745881.html

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STM32F103 TIM1 PWM