stm32F407定时六秒代码
时间: 2024-06-11 07:02:28 浏览: 28
下面是一个基于STM32F407的定时器中断的六秒代码:
首先,需要初始化定时器。以TIM2为例,可以使用以下代码初始化:
```
void TIM2_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 42000000 / 2; //定时时间为6s,时钟为84MHz
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM2, ENABLE);
}
```
然后,在`TIM2_IRQHandler()`函数中编写中断处理程序,在每次定时器溢出时进行相应的操作。例如,可以在此处控制LED灯闪烁:
```
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
GPIO_ToggleBits(GPIOD, GPIO_Pin_12);
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}
}
```
最后,在`main()`函数中调用`TIM2_Init()`函数即可开始定时。
相关问题:
1. 如何在STM32F407上使用定时器?
2. 如何初始化定时器?
3. 如何在定时器中断处理程序中控制LED灯闪烁?
4. 如何控制定时器的定时时间?
5. STM32F407有哪些定时器?它们有何不同?