stm32f407基本定时器7应用

只看该作者 · 2014-5-8 16:53

stm32f407基本定时器7配置不知道有什么问题，向大神们请教
void TIM7_init(void)
{
  TIM7->PSC = 41;       //42分频 1M
TIM7->ARR =1000;       //定时1ms
TIM7->CNT = 0;          //
  TIM7->CR1 |= (1<<7);    //
  TIM7->DIER  |= 1;          //
NVIC->IP[55] = 0x80;       //
  NVIC->ISER[1] |= (1<<23); //开中断
TIM7->CR1 |= 1;          //
}

3万 · 2014-5-8 19:19

你这也太简单了吧

3万 · 2014-5-8 19:26

基本步骤

1、首先开启TIM1的时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

2、时基单元的初始化

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_p1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period = 0x1068;
TIM_TimeBaseInitStructure.TIM_Prescaler = 0x2710;
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStructure);
TIM_ClearFlag(TIM1,TIM_FLAG_Update); //必须先清除配置时候产生的更新标志
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE); //使能中断，中断事件为定时器工薪事件
TIM_Cmd(TIM1,ENABLE); //使能定时器

3、中断处理函数

只看该作者 · 2014-5-9 10:56

本帖最后由 yzzly 于 2014-5-9 10:59 编辑

#if(TIME7)
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

      NVIC_InitStructure.NVIC_IRQChannel = TIM7_IRQChannel;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM7, ENABLE);                //Ê¹ÄÜT7Ê±ÖÓ
      TIM_InternalClockConfig(TIM7);                                                             //TIM7Ñ¡ÔñÄÚ²¿Ê±ÖÓÇý¶¯

      if(((RCC->CFGR >> 10) & 0x04)==0)                                                    //Èç¹ûAPB1Ê±ÖÓÓÉAHBÊ±ÖÓ²»·ÖÆµµÃÀ´
      {
            Temp=1;
      }
      else
      {
            Temp=2;
      }

      TIM_TimeBaseStructure.TIM_Period = TIM7_Delay*TIM7_ClkFre/1000;       //ÖÜÆÚ¾ÍÊÇ×Ô¶¯ÖØ×°ÔØ¼Ä´æÆ÷ARRµÄÖµ
      TIM_TimeBaseStructure.TIM_Prescaler = APB1CLK*Temp/TIM7_ClkFre-1;    //Ô¤·ÖÅäÆ÷
      TIM_TimeBaseStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM7, &TIM_TimeBaseStructure);

      TIM_ITConfig(TIM7, TIM_IT_Update, ENABLE);                                           //ÖÐ¶ÏÊ¹ÄÜ¼Ä´æÆ÷
      TIM_Cmd(TIM7, ENABLE);
#endif
可以做到1毫秒的定时