经过定时器配置后oled屏不能显示了？

只看该作者 · 2019-11-1 16:54

oled显示的代码是移植过来的。
经过红色那部分的配置之后，oled的清屏函数OLED_CLS，显示函数OLED_ShowStr都没用了。

#include &quot;stm32f10x.h&quot;
#include &quot;OLED_I2C.h&quot;
#include &quot;delay.h&quot;
#include &quot;stdio.h&quot;
float a1,a2,period=0,frequency;
uint8_t flag=0;
void GPIO_INIT()
{
      GPIO_InitTypeDef GPIOS;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA,ENABLE);

      GPIOS.GPIO_Pin=GPIO_Pin_0;
      GPIOS.GPIO_Mode=GPIO_Mode_AF_PP;
      GPIOS.GPIO_Speed=GPIO_Speed_50MHz;
      GPIO_Init(GPIOB,&GPIOS);

      GPIOS.GPIO_Pin=GPIO_Pin_2;
      GPIOS.GPIO_Mode=GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOA,&GPIOS);
}
void TIM3_INIT()
{
      TIM_TimeBaseInitTypeDef TIMEBASE;
      TIM_OCInitTypeDef TIM_OC;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

      TIMEBASE.TIM_Period=9999;
      TIMEBASE.TIM_Prescaler=71;
      TIMEBASE.TIM_CounterMode=TIM_CounterMode_Up;
      TIMEBASE.TIM_ClockDivision=TIM_CKD_DIV1;
      TIM_TimeBaseInit(TIM3,&TIMEBASE);

      TIM_OC.TIM_OCMode=TIM_OCMode_PWM1;
      TIM_OC.TIM_OutputState=TIM_OutputState_Enable;
      TIM_OC.TIM_Pulse=9900;
      TIM_OC.TIM_OCPolarity=TIM_OCPolarity_High;
      TIM_OC3Init(TIM3,&TIM_OC);
      TIM_OC3PreloadConfig(TIM3,TIM_OCPreload_Enable);

      TIM_ARRPreloadConfig(TIM3,ENABLE);
      TIM_Cmd(TIM3,ENABLE);
}
void TIM2_INIT()
{
      TIM_ICInitTypeDef TIM_IC;
      TIM_TimeBaseInitTypeDef TIMEBASE;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

      TIMEBASE.TIM_Period=0xffff;
      TIMEBASE.TIM_Prescaler=72-1;
      TIMEBASE.TIM_CounterMode=TIM_CounterMode_Up;
      TIMEBASE.TIM_ClockDivision=TIM_CKD_DIV1;
      TIM_TimeBaseInit(TIM2,&TIMEBASE);

      TIM_IC.TIM_Channel=TIM_Channel_3;
      TIM_IC.TIM_ICFilter=0;
      TIM_IC.TIM_ICPolarity=TIM_ICPolarity_Rising;
      TIM_IC.TIM_ICSelection=TIM_ICSelection_DirectTI;
      TIM_IC.TIM_ICPrescaler = TIM_ICPSC_DIV1;
      TIM_ICInit(TIM2,&TIM_IC);
      TIM_Cmd(TIM2,ENABLE);

      TIM_ARRPreloadConfig(TIM2,ENABLE);
      TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
      TIM_ITConfig(TIM2,TIM_IT_CC3,ENABLE);
}
void NVIC_INIT()
{
      NVIC_InitTypeDef NVICS;
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

      NVICS.NVIC_IRQChannel=TIM2_IRQn;
      NVICS.NVIC_IRQChannelPreemptionPriority=0;
      NVICS.NVIC_IRQChannelSubPriority=0;
      NVICS.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVICS);
}
void TIM2_IRQHandler()
{
            if(TIM_GetITStatus(TIM2,TIM_IT_CC3)!=0)
      {
            if(flag==0)
            {
                     TIM_ClearITPendingBit(TIM2,TIM_IT_CC3);
                     a1=TIM_GetCapture3(TIM2);
                     flag=1;
            }
            else if(flag==1)
            {
                     if(TIM_GetFlagStatus(TIM2,TIM_FLAG_Update) != SET)
                     {
                              a2=TIM_GetCapture3(TIM2);
                              period=a2-a1;
                     }
                     else
                     {
                              TIM_ClearITPendingBit(TIM2,TIM_IT_CC3);
                              period=0xffff-a1+TIM_GetCapture3(TIM2)+1;
                     }
                     flag=0;
                     frequency=(float)1000000/period;
            }

      }
}
void init()
{
      GPIO_INIT();
      TIM3_INIT();
      TIM2_INIT();
      NVIC_INIT();
}

int main(void)
{
      char num[10];

      init();
      DelayInit();
      I2C_Configuration();
      OLED_Init();

      OLED_CLS();
  OLED_ShowStr(0,0,(unsigned char*)&quot;wsw&quot;,2);

      while(1)
      {
            sprintf(num,&quot;%f&quot;,frequency);
            OLED_ShowStr(0,0,(unsigned char*)num,2);
      }
}

经过定时器配置后oled屏不能显示了？

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