【STM32】通用定时器TIM2-TIM5中断配置方式+继电器控制

1. //宏定义，方便后期代码移植
2. #define RELAY_PORT   GPIOF
3. #define RELAY        GPIO_Pin_0

1. // 0-65535
2. void RELAY_Config(uint16_t Period, uint16_t Prescaler)
3. {
4.  //先开时钟
5.  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF, ENABLE);
6.  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,  ENABLE);   //TIM2在APB1总线
7. 
8.  GPIO_InitTypeDef GPIO_InitStructure;
9.  TIM_TimeBaseInitTypeDef TIM_InitStructure;
10.     NVIC_InitTypeDef NVIC_InitStructure;
11. 
12.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    //配置推挽输出
13.     GPIO_InitStructure.GPIO_Pin = RELAY;
14.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
15.     GPIO_Init(RELAY_PORT, &GPIO_InitStructure);
16. 
17.     //继电器输入一个高电平信号是工作状态，所以先初始化低电平
18.     GPIO_ResetBits (RELAY_PORT, RELAY); //LOW
19. 
20.     TIM_InitStructure.TIM_Period    = Period;   //重装载值
21.     TIM_InitStructure.TIM_Prescaler = Prescaler;    //预分频值
22.     TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分割无
23.     TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
24.     TIM_InitStructure.TIM_RepetitionCounter = DISABLE;  //先禁用 重复计数次数
25.     TIM_TimeBaseInit(TIM2, &TIM_InitStructure); //初始化
26. 
27.     //开中断之前，先清空中断!!!
28.     TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
29. 
30.     //开启中断，要或 | 上触发中断源TIM_IT_Trigger
31.     TIM_ITConfig(TIM2, TIM_IT_Update | TIM_IT_Trigger, ENABLE);
32.     TIM_Cmd(TIM2, ENABLE);
33. 
34.     //中断优先级分组，先随意，因为没有多个中断同时触发
35.     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
36.     NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //中断源
37.     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
38.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//抢占
39.     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;//响应
40.     NVIC_Init(&NVIC_InitStructure);
41. 
42. }

1. void TIM2_IRQHandler(void)
2. {
3.  if (TIM_GetITStatus (TIM2, TIM_IT_Update) == SET)   //判断TIM_GetITStatus == 1 判断是否进入中断
4.  {
5.      //写位操作      //SET - GPIO_ReadOutputDataBit  1-读取到的输出状态位，就是取非操作
6.      GPIO_WriteBit (RELAY_PORT, RELAY, (BitAction)(SET - GPIO_ReadOutputDataBit(RELAY_PORT, RELAY) ) );
7.      TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //清空中断
8.  }
9. }

1. int main(void)
2. {
3.  RELAY_Config (2000-1, 7200-1);//人工减1，系统加1
4. 
5.  //每次中断都翻转电平，200ms翻转一次，周期就是400ms
6.  while(1)
7.  {       
8.  }
9. }