NUCLEO H533RE】之二 串口+定时功能+精确延时

                        NUCLEO H533RE】之二 串口+定时功能+精确延时

void HAL_Delay_us(uint32_t us)
{
		uint32_t d=0;
		HAL_TIM_Base_Start(&htim2);
		__HAL_TIM_SetCounter(&htim2,0);
		while(d < us)
		{
				d = __HAL_TIM_GetCounter(&htim2);
		}
		HAL_TIM_Base_Stop(&htim2);
}

a，加入前面的延时函数(前面已经列出)

b，定义IO读写函数和串口接收数据缓存结构体

typedef struct
{
	uint8_t RBuf[2];
    uint8_t buf[UARTMAX];
	uint16_t front;
	uint16_t rear;
	uint8_t read_flag;
}UARTBufferDef;
UARTBufferDef Uartrec2;

#define LD2_Write(x) {if(0==(x)) HAL_GPIO_WritePin(LD2_Led_GPIO_Port, LD2_Led_Pin, GPIO_PIN_RESET); else HAL_GPIO_WritePin(LD2_Led_GPIO_Port, LD2_Led_Pin, GPIO_PIN_SET);}
GPIO_PinState Read_UserButton(void)
{
	return HAL_GPIO_ReadPin(GPIOC, USER_Button_Pin);
}

b，加入定时器回调函数（处理定时器3）这里就搞了个4秒一个周期的led 亮灭。

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  	if(htim == &htim3)
	{
  		static int delay_led=0;
  		delay_led++;
  		if(delay_led ==2000)
  		{
  			LD2_Write(1);
  		}
  		if(delay_led ==4000)
  		{
  			delay_led=0;
  			LD2_Write(0);
  		}

	}
}

c，加入串口回调函数和处理串口2命令函数

  前面已经有了串口缓存结构体 下面加入回调函数，这里处理从pc发来的命令并回答命令和点灯。

//串口回调函数
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if(huart->Instance == USART2)
	{
		Uartrec2.buf[Uartrec2.front%UARTMAX] = Uartrec2.RBuf[0];
        if(Uartrec2.front >=UARTMAX) Uartrec2.front=0;
		HAL_UART_Receive_IT(huart,Uartrec2.RBuf,1);
	}
}
void Uart2Command(void)
{
	static uint8_t uart2_rebuf[100]={0};
	static uint8_t uart2_point=0;
	uint8_t rd;

	while(if (Uartrec2.front != Uartrec2.rear)&&(0 == Uartrec2.read_flag))
	{
			if(Uartrec2.rear >=UARTMAX) Uartrec2.rear=0;
		    rd = Uartrec2.buf[Uartrec2.rear];
		    if((0x0d != rd)&&(0x0a != rd))
			{
				uart2_rebuf[uart2_point++] =rd;
				uart2_point =uart2_point%100;
			}
			else
			{
				Uartrec2.read_flag =1;
			}

	}
	if(1 == Uartrec2.read_flag)
	{
		uint8_t send[20]={'n','o','w',' ','l','d','2',' ','i','s',' ','o','n','f',0};
		if(0 != uart2_point)
		{
			//处理接收的数 ld2 on  ld2 off
			if(('l' ==uart2_rebuf[0])&&('d' ==uart2_rebuf[1])&&('2' ==uart2_rebuf[2])&&(' ' ==uart2_rebuf[3])&&('o' ==uart2_rebuf[4])&&('n'==uart2_rebuf[5])&&(6 <= uart2_point))
			{
				send[13]= '\r';send[14]='\n';
				HAL_UART_Transmit(&huart2,send,15,0xffff);
				LD2_Write(1);
				HAL_Delay(20);
			}
			if(('l' ==uart2_rebuf[0])&&('d' ==uart2_rebuf[1])&&('2' ==uart2_rebuf[2])&&(' ' ==uart2_rebuf[3])&&('o' ==uart2_rebuf[4])&&('f'==uart2_rebuf[5])&&('f' ==uart2_rebuf[6])&&(7 <= uart2_point))
			{
				send[14]= '\r';send[15]='\n';send[12]= 'f';
				HAL_UART_Transmit(&huart2,send,16,0xffff);
				LD2_Write(0);
				HAL_Delay(20);
			}
		}
		uart2_point=0;
		for(uint8_t i=0;i<100;i++)
		{
			uart2_rebuf[i] =0;
		}
		Uartrec2.read_flag =0;
	}
}

 HAL_UART_Receive_IT(&huart2,(uint8_t *)Uartrec2.RBuf,1);
  HAL_TIM_Base_Start_IT(&htim3);
  Uartrec2.read_flag =0;
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
	  Uart2Command();
      //LD2_Write(1);
      Hal_Delay_us(100);
      //LD2_Write(0);
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

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