pwm仿真，波形是静态的

只看该作者 · 2019-11-21 11:12

pwm按照教程写的程序keil仿真，波形无法动态显示
#include &quot;PWM.h&quot;

static void TIM3_GPIO_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6 | GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0 | GPIO_Pin_1;
      GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
}

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 = 500;
      u16 CCR2_Val = 375;
      u16 CCR3_Val = 250;
      u16 CCR4_Val = 125;

      TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
      TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
      TIM_TimeBaseStructure.TIM_Period=999;
      TIM_TimeBaseStructure.TIM_Prescaler=0;
      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);


      TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
      TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse=CCR1_Val;
      TIM_OC1Init(TIM3, &TIM_OCInitStructure);
      TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

      //TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
      TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse=CCR2_Val;
      TIM_OC2Init(TIM3, &TIM_OCInitStructure);
      TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

      //TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
      TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse=CCR3_Val;
      TIM_OC3Init(TIM3, &TIM_OCInitStructure);
      TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

      //TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
      TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
      TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse=CCR4_Val;
      TIM_OC4Init(TIM3, &TIM_OCInitStructure);
      TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

      TIM_ARRPreloadConfig(TIM3, ENABLE);

      TIM_Cmd(TIM3, ENABLE);                //使能定时器3

}

void TIM3_PWM_Init(void)
{
      TIM3_GPIO_Config();
      TIM3_Mode_Config();
}

pwm仿真，波形是静态的

相关帖子