RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
SysTick_SetReload(72000);
TIM_TimeBaseStructure.TIM_Period = 9000;
TIM_TimeBaseStructure.TIM_Prescaler = 4;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
我这样配置的时钟，可是SysTick比TIM3跑的快，这是为什么 |
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楼主
