MINIV3+TIM1(CH1,2,3,4)-PA8,9,10,11输出4路PWM测试程序

peng1554 · 发表于 2018-11-29 21:30:52

本帖最后由 peng1554 于 2018-11-29 21:32 编辑

http://www.openedv.com/forum.php?mod=viewthread&tid=283967
有网友自己用MINIV3的PA8,PA9输出PWM遇到问题，可以下载这个代码测试程序重要的是TIM1_PWM_Init()函数
[mw_shl_code=c,true]//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM1_PWM_Init(u16 arr,u16 psc)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能


//设置该引脚为复用输出功能,输出TIM1 CH1的PWM脉冲波形
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11; //TIM_CH1
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);


      TIM_TimeBaseStructure.TIM_Period = arr; //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       80K
      TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
      TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
      TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //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_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高

      TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
      TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);
      TIM_OC4Init(TIM1, &TIM_OCInitStructure);

      TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
      TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
      TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
      TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

      TIM_CtrlPWMOutputs(TIM1,ENABLE);       //MOE 主输出使能
      TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
      TIM_Cmd(TIM1, ENABLE);  //使能TIM1

}[/mw_shl_code]、
main函数中调用TIM_SetCompare1（）设置输出通道1PWM的占空比
[mw_shl_code=c,true] int main(void)
{
      delay_init();                   //延时函数初始化
      LED_Init();                         //初始化与LED连接的硬件接口
      TIM1_PWM_Init(1799,179);//不分频。PWM频率=72000/(899+1)=80Khz
      TIM_SetCompare1(TIM1,899);
      TIM_SetCompare2(TIM1,1500);
      TIM_SetCompare3(TIM1,600);
      TIM_SetCompare4(TIM1,300);
}[/mw_shl_code]