之前跟朋友聊到了现代农业蔬菜大棚的智能化问题,朋友希望能够给一个建议,如何实现智能化管理和监控,我的大概思路是控制节点上安装传感器和执行器,节点间通过485总线将节点信息汇集到网关,网关通过4G网络上送到云,在监控端网络连接到云进行控制。之后了解到用户的监控和节点端的距离通常不会超过3000米,而且两者中间通常没有高大建筑物阻挡,于是考虑是否可以使用LoRa方案实现,正好社区有LoRa模块的使用机会,于是果断下手,幸运的是获得了这次试用的机会,于是果断修改方案。
单片机源程序如下:
- /* Includes ------------------------------------------------------------------*/
- #include "main.h"
- #include "stm32f1xx_hal.h"
- #include "usart.h"
- #include "usb_device.h"
- #include "gpio.h"
- /* USER CODE BEGIN Includes */
- // 包含USB头文件
- #include "usbd_cdc.h"
- /* USER CODE END Includes */
- /* Private variables ---------------------------------------------------------*/
- /* USER CODE BEGIN PV */
- /* Private variables ---------------------------------------------------------*/
- // 定义接收和发送缓冲区
- uint8_t aRxBuffer[20];
- uint8_t aTxBuffer[20];
- /* USER CODE END PV */
- /* Private function prototypes -----------------------------------------------*/
- void SystemClock_Config(void);
- /* USER CODE BEGIN PFP */
- /* Private function prototypes -----------------------------------------------*/
- /* USER CODE END PFP */
- /* USER CODE BEGIN 0 */
- /* USER CODE END 0 */
- /**
- * @brief The application entry point.
- *
- * @retval None
- */
- 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();
- MX_USB_DEVICE_Init();
- /* USER CODE BEGIN 2 */
-
- // 设置SX1278的M0和M1为低电平,进入透传模式
- HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,GPIO_PIN_RESET);
- HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1,GPIO_PIN_RESET);
- // 点亮LED2
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13,GPIO_PIN_RESET);
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13,GPIO_PIN_SET);
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13,GPIO_PIN_RESET);
- // 开启串口接收中断
- HAL_UART_Receive_IT(&huart2, (uint8_t *)aRxBuffer, 8);
-
- /* USER CODE END 2 */
- /* Infinite loop */
- /* USER CODE BEGIN WHILE */
- while (1)
- {
- /* USER CODE END WHILE */
- /* USER CODE BEGIN 3 */
- }
- /* USER CODE END 3 */
- }
- /**
- * @brief System Clock Configuration
- * @retval None
- */
- void SystemClock_Config(void)
- {
- RCC_OscInitTypeDef RCC_OscInitStruct;
- RCC_ClkInitTypeDef RCC_ClkInitStruct;
- RCC_PeriphCLKInitTypeDef PeriphClkInit;
- /**Initializes the CPU, AHB and APB busses clocks
- */
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
- RCC_OscInitStruct.HSEState = RCC_HSE_ON;
- RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
- RCC_OscInitStruct.HSIState = RCC_HSI_ON;
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
- RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
- RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
- {
- _Error_Handler(__FILE__, __LINE__);
- }
- /**Initializes the CPU, AHB and APB busses clocks
- */
- RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
- |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
- RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
- RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
- RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
- RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
- {
- _Error_Handler(__FILE__, __LINE__);
- }
- PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
- PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV1_5;
- if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
- {
- _Error_Handler(__FILE__, __LINE__);
- }
- /**Configure the Systick interrupt time
- */
- HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
- /**Configure the Systick
- */
- HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
- /* SysTick_IRQn interrupt configuration */
- HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
- }
- /* USER CODE BEGIN 4 */
- // 实现串口中断回调函数
- void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
- {
- /* Prevent unused argument(s) compilation warning */
- UNUSED(huart);
- /*
- // 回环测试,串口接收到数据后重新组织数据发送回去
- aTxBuffer[0]=0x55;
- aTxBuffer[1]=0xbb;
- aTxBuffer[2]=0x17;
- aTxBuffer[3]=0x38;
- aTxBuffer[4]=0x37;
- aTxBuffer[5]=0x36;
- aTxBuffer[6]=0x35;
- aTxBuffer[7]=0x34;
- aTxBuffer[8]=0x33;
- aTxBuffer[9]=0x32;
- aTxBuffer[10]=0x31;
- HAL_UART_Transmit(&huart2, (uint8_t *)aTxBuffer, 11,0xFFFF);
- */
- // 功能代码,串口接收到数据后通过USB虚拟串口发送出去。
- USBD_CDC_SetTxBuffer(&hUsbDeviceFS, aRxBuffer, 8);
- USBD_CDC_TransmitPacket(&hUsbDeviceFS);
-
- HAL_UART_Receive_IT(&huart2, (uint8_t *)aRxBuffer, 8);
- }
- /* USER CODE END 4 */
- /**
- * @brief This function is executed in case of error occurrence.
- * @param file: The file name as string.
- * @param line: The line in file as a number.
- * @retval None
- */
- void _Error_Handler(char *file, int line)
- {
- /* USER CODE BEGIN Error_Handler_Debug */
- /* User can add his own implementation to report the HAL error return state */
- while(1)
- {
- }
- /* USER CODE END Error_Handler_Debug */
- }
- #ifdef USE_FULL_ASSERT
- ……………………
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