震惊，原子stm32竟然会出现这样的问题！

思恋尘缘 · 发表于 2017-3-13 19:49:54

其实我想问一下，我建c8t6的工程，选用md的启动文件，为什么我定时器定时5ms，实际却是50ms，我延时500ms让LED闪烁，却发现是5s。这是为什么？不知道为什么，求解！代码如下
            LED0=0;
delay_ms(500);
LED0=1;
delay_ms(500);

void Timer1_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_DeInit(TIM1);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 49;//×Ô¶ˉÖØ×°3õÖμ￡¬Ã¿200′ÎÖD¶Ïò»′Î  5MS
TIM_TimeBaseStructure.TIM_Prescaler = 7199;//pscÔ¤·ÖÆμ
TIM_TimeBaseStructure.TIM_ClockDivision = 0;//ê±Öó2»·ÖÆμ
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//ÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM1, & TIM_TimeBaseStructure);

TIM_ARRPreloadConfig(TIM1,ENABLE);//ê1ÄüTIMxÔúARRéÏμÄÔ¤×°ÔØ¼Ä′æÆ÷
TIM_Cmd(TIM1,ENABLE);//ê1Äü¶¨ê±Æ÷
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE); //ê1Äü¶¨ê±Æ÷ÖD¶Ï

  NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;//éèÖÃí¨μàêy
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;//Ö÷óÅÏè¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//′óóÅÏè¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}