系统时钟为72M,芯片为STM32F105RCT6
__IO uint16_t CCR1_Val = 1000;
配置部分：
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = 2000;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
// Output Compare Toggle Mode configuration: Channel1
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
// TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);//Disableh和Enable都试过
//TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
// TIM enable counter
TIM_Cmd(TIM1, ENABLE);
// TIM IT enable
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x03;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
中断部分：
void TIM1_CC_IRQHandler(void)
{
uint16_t capture = 0;
if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)
{
TIM_ClearITPendingBit(TIM1, TIM_IT_CC1 );
capture = TIM_GetCapture1(TIM1);
// TIM_SetCompare1(TIM1, capture + CCR1_Val );
TIM_SetCompare1(TIM1, CCR1_Val );
}
}
程序大致是这个样子了，请大家看看有什么问题！！
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