配置stm32f103rct6 tim3定时器
时间: 2023-09-11 16:06:22 浏览: 48
首先,需要按照以下步骤进行配置:
1. 使能TIM3时钟
在RCC寄存器中设置TIM3时钟使能位:
```c
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
```
2. 配置TIM3的基本参数
设置TIM3的预分频器、计数模式、计数方向、自动重载值等参数:
```c
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_TimeBaseInitStruct.TIM_Prescaler = 72 - 1; //预分频器为72-1
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; //计数模式为向上计数
TIM_TimeBaseInitStruct.TIM_Period = 1000 - 1; //自动重载值为1000-1
TIM_TimeBaseInitStruct.TIM_ClockDivision = 0; //时钟分频为不分频
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0; //重复计数器值为0
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
```
3. 配置TIM3的中断
设置TIM3中断的触发条件和优先级:
```c
NVIC_InitTypeDef NVIC_InitStruct;
NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级为0
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1; //子优先级为1
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; //中断使能
NVIC_Init(&NVIC_InitStruct);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); //使能TIM3更新中断
```
4. 启动TIM3
```c
TIM_Cmd(TIM3, ENABLE);
```
5. 处理TIM3中断
在TIM3中断服务函数中处理定时器中断:
```c
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
//处理定时器中断
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
}
}
```
以上就是配置STM32F103RCT6 TIM3定时器的步骤。