【百问网】7天物联网智能家居 第六天：编写初步程序

主要编写函数

以下代码是串口usart函数的实现代码

static uint8_t rx_len;
static uint8_t rx_data;
static uint8_t usart_rx_buf[200];

// 串口2启动接收
void USART2_StartRx(void)
{
	HAL_UART_Receive_IT(&huart2, (uint8_t*)&rx_data, 1);
}

// 串口2中断回调函数(保存每次接收的数据,并启动下一次接收)
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	usart_rx_buf[rx_len%200] = rx_data;
	rx_len++;
	HAL_UART_Receive_IT(&huart2, (uint8_t*)&rx_data, 1);
}

// 串口2接收的数据
uint16_t USART2_Receive(uint8_t *pdata)
{
	memcpy(pdata, (uint8_t*)usart_rx_buf, rx_len);
	return rx_len;
}

// 串口2发送数据
void USART2_Transmit(uint8_t *pData, uint16_t Size, uint32_t Timeout)
{
	HAL_UART_Transmit(&huart2, pData, Size, Timeout);
}

// 清理串口2接收的数据
void USART2_ClearBuf(void)
{
	rx_len = 0;
	memset((uint8_t*)usart_rx_buf, 0, 200);
}

// 向ESP8266发送AT指令
uint8_t ESP8266_SendCommand(char *cmd, char *reply, uint16_t timeout)
{
	// 1.保存传入的指令
	char buf[256] = {0};
	strcat(buf, cmd);
	
	// 2.处理AT指令
	if (strstr(buf, "\r\n") == 0)
	{
		strcat(buf, "\r\n");
	}
	
	// 3.清理前面接收的buf
	USART2_ClearBuf();
	
	// 4.发送数据
	USART2_Transmit((uint8_t *)buf, strlen(buf), 500);
	
	// 5.接收数据
	memset(buf, 0, 256);
	while(timeout != 0)
	{
		if(USART2_Receive((uint8_t *)buf))
		{
			if (strstr(buf, reply))
			{
				printf("%s Send ok!\r\n", cmd); // 发送成功
				
				if (strstr(buf, "CIFSR"))
					printf("%s\r\n", buf); // 打印IP地址
				
				return 0;
			}
			else
			{
				timeout--;
				HAL_Delay(1);
			}
		}
	}
	
	printf("%s Send error!\r\n", cmd); // 发送失败
	return 1;
}

// 向ESP8266发送TCP数据
uint8_t ESP8266_Send_TCP(char *data)
{
	// 1.准备发送的指令
	char buf[256] = {0};
	uint8_t len = strlen(data);
	sprintf(buf, "AT+CIPSEND=0,%d\r\n", len);
	// 2.发送指令
	if (ESP8266_SendCommand(buf, "OK", 500) == 0)
	{
		// 3.发送数据
		ESP8266_SendCommand(data, "OK", 1000);
		return 0;
	}
	return 1;
}

这里发送都是字符，所以需要读写字符函数

/*****************************************************
*function: 写字符文件函数
*param1: 输出的字符
*param2: 文件指针
*return: 输出字符的ASCII码
******************************************************/
int fputc(int ch, FILE *f)
{
	HAL_UART_Transmit(&huart1, (uint8_t*)&ch, 1, 10);
	return ch;
}
/*****************************************************
*function: 读字符文件函数
*param1: 文件指针
*return: 读取字符的ASCII码
******************************************************/
int fgetc(FILE *f)
{
	uint8_t ch = 0;
	HAL_UART_Receive(&huart1, (uint8_t*)&ch, 1, 10);
	return (int)ch;
}

主函数核心代码

int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();

  /* Initialize interrupts */
  MX_NVIC_Init();
  /* USER CODE BEGIN 2 */
  
  //uint16_t data_len = 0;
  uint8_t rx_data[200] = {0};
  //uint8_t tx_data[200] = "AT\r\n";
  
  // 1.启动串口2接收(中断方式)
  USART2_StartRx();
  HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
  // 2.串口2发送AT指令,启动TCP服务
  //USART2_Transmit(tx_data, sizeof(tx_data), 500);
  ESP8266_SendCommand("AT+RST", "OK", 500);
  HAL_Delay(1000);
  ESP8266_SendCommand("AT+CWMODE=1", "OK", 500);
  ESP8266_SendCommand("AT+CWJAP=\"12345\",\"1241138418..\"", "OK", 10000);
  ESP8266_SendCommand("AT+CIPMUX=1", "OK", 500);
  ESP8266_SendCommand("AT+CIPSERVER=1,9999", "OK", 500);
  ESP8266_SendCommand("AT+CIFSR", "OK", 500);
  /* USER CODE END 2 */
 HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
	// 3.1 按键按下,发送门铃信号
	if (Key_GetFlag() == 1)
	{
		ESP8266_Send_TCP("{\"data\":\"doorbell\",\"status\":\"1\"}");
	}
	
	
	// 3.2 收到数据,控制灯
	if (USART2_Receive(rx_data)) //接收到数据
	{
		if (strstr((char *)rx_data, "\"dev\":\"led\",\"status\":\"0\""))
		{
			printf("led off\n\r");
			HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
			USART2_ClearBuf();
			memset(rx_data, 0, 200);
		}
		else if (strstr((char *)rx_data, "\"dev\":\"led\",\"status\":\"1\""))
		{
			printf("led on\n\r");
			HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
			USART2_ClearBuf();
			memset(rx_data, 0, 200);
		}
	}
  }
  /* USER CODE END 3 */
}

这里我们完成了串口的启动，收发，清理，发送AT指令，发送TCP指令，写字符，读字符。