stm32f103rc的tim7为什么用中断不能产生方波？？有程序谁给看一下

淼鎏儿 · 发表于 2015-11-30 20:02:51

void TIM7_Init(void)
{
TIM_TimeBaseInitTypeDef TIM7_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = TIM7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_Init(&NVIC_InitStructure);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM7, ENABLE); //RCC_APB1Periph_TIM7

TIM_TimeBaseStructInit(&TIM7_TimeBaseStructure);
TIM7_TimeBaseStructure.TIM_Prescaler = 36000 - 1; // ??????????2KHz
TIM7_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM7_TimeBaseStructure.TIM_Period = 400 - 1; // 5Hz ????
TIM7_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseInit(TIM7, &TIM7_TimeBaseStructure);

TIM_UpdateRequestConfig(TIM7, TIM_UpdateSource_Regular);

TIM_Cmd(TIM7, ENABLE);
TIM_ITConfig(TIM7, TIM_IT_Update, ENABLE);
}

void TIM7_IRQHandler(void)
{
if(TIM_GetITStatus(TIM7, TIM_IT_Update)== SET)
{
LED0=!LED0;
TIM_ClearITPendingBit(TIM7 , TIM_FLAG_Update);
}
}