请问这个定时器中断为什么没有进入
void TIM3_Config(void) //TIM3输出PWM控制俯仰电机
{
/* TIM Configuration */
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* GPIOC Configuration: CH1 (PC6)*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //PC6口使用复用功能模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; //上拉
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Connect TIM3 pins to AF2 */
GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM3); //将PC6映射至TIM3
/* Compute the prescaler value */
TIM3_PrescalerValue = (uint16_t) ((SystemCoreClock /2) / 500000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 9999;
TIM_TimeBaseStructure.TIM_Prescaler = TIM3_PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = TIM3_CCR1_Val; //定义占空比
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable); //TIM3_CCR1_Val值预装载
TIM_ARRPreloadConfig(TIM3, ENABLE);
//TIM_ClearFlag(TIM3, TIM_FLAG_Update);
TIM_ITConfig(TIM3, TIM_IT_CC1, DISABLE); //上电时不打开中断，待标定完成开始扫描时再打开计数
}
void TIM3_NVIC_Config(void) //定义TIM3中断
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
这是中断函数
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_CC1)!=RESET)
{
switch(direction)
{
case 0 :
pulse_counter=pulse_counter+1; //位置加1，逆时针旋转
if(pulse_counter>=N) //此时俯仰角为45°，需要切换方向
{ TIM_Cmd(TIM3, DISABLE); //俯仰电机停止
GPIO_ToggleBits(GPIOE, GPIO_Pin_3); //俯仰电机准备切换方向
//Systickdelay(5);
TIM_Cmd(TIM3, ENABLE); //启动俯仰电机
direction= 1;
}
TIM_ClearITPendingBit(TIM3, TIM_IT_CC1); //清除中断标志位
case 1 :
pulse_counter=pulse_counter-1; //顺时针旋转
TIM_ClearITPendingBit(TIM3, TIM_IT_CC1); //清除中断标志位
}
}
}
其中的TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);是放在主程序里面打开的，为什么进入不了中断，请大师们指教。我原意是想每一个周期产生一次中断。
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