今天莫名其妙的在STM32F401 NUCLEO板子上折腾了一天通用定时器的配置，一直没有成功运行。
刚刚试着将代码改换到STM32F407 DISCO板子上运行，却意外地运行成功了。（LED闪烁）
两块板子的区别只在于 前者使用内部晶振，后者使用外部晶振。
程序是用来测试的所以没有注释，应该也容易看懂
有空的帮我看看什么情况吧。
- int main(void)
- {
- RCC_ClocksTypeDef MyClock;
- SystemCoreClockSetHSI();
- RCC_GetClocksFreq (&MyClock);
-
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2 );
- Btn_EXTI_Init();
- // USART1_Init();
- LED_GPIO_Init ();
- LED_OFF ();
- TIM3_Config();
- while(1)
- {
- // /* Toggle LED */
- // LED_Toggle();
- }
- return 0;
- }
- void TIM3_Config(void)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- NVIC_InitStructure .NVIC_IRQChannel = TIM3_IRQn;
- NVIC_InitStructure .NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure .NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure .NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
-
- RCC_APB1PeriphClockCmd (RCC_APB1Periph_TIM3 ,ENABLE);
-
- TIM_DeInit(TIM3);
-
- TIM_TimeBaseStructure .TIM_Period = 1000-1; //1000*1ms = 1s
- TIM_TimeBaseStructure .TIM_Prescaler = 24000; //1KHz -- 1ms
- TIM_TimeBaseStructure .TIM_CounterMode = TIM_CounterMode_Up ;
- TIM_TimeBaseStructure .TIM_ClockDivision = TIM_CKD_DIV1 ;
-
- TIM_TimeBaseInit (TIM3,&TIM_TimeBaseStructure);
- TIM_ClearFlag (TIM3,TIM_FLAG_Update);
- TIM_ITConfig (TIM3,TIM_IT_Update ,ENABLE);
- TIM_Cmd (TIM3,ENABLE);
- }
- void TIM3_IRQHanlder(void)
- {
- if(TIM_GetITStatus(TIM3,TIM_IT_Update ) != RESET )
- {
- TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
- LED_Toggle ();
- }
- }
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