物联网之LoRa开发与应用五（串口透传开发）

LoRa串口透传系统设计

内容概要：

1、串口透传系统设计需求

2、串口透传系统通信机制

3、串口透传系统业务流程

串口透传系统设计需求：

1、将LoRa终端定义成两种角色：Master（主机）和Slave（从机）

2、一个模块发送任意字节长度（小于128Byte）数据，另一模块都可以接收到

3、PC机上通过串口调试助手实现接收和发送

4、终端在LCD屏幕上显示终端类型及收发数据包个数

串口透传系统通信机制：

串口透传业务流程-初始化：

串口透传业务流程-主程序：

串口透传业务流程-LCD任务：

串口透传业务流程-串口接收任务：

串口透传业务流程-无线任务：

LoRa串口透传系统功能开发

内容概要：

1、串口功能开发

2、LCD功能开发

3、无线收发功能开发

串口功能接口：（这里介绍了相关函数和相关代码，里面使用到的一些变量在下面串口数据结构中会有说明）

​//启动串口1，使能串口空闲中断 。设置为空闲中断模式可以在整包之后才进行数据的收发，然后产生中断，避免重复单个数据的收发（减小开销）
  __HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);//注意：使能空闲中断后，不管有没有接收数据，会先触发一次中断，发送一次数据 
  HAL_UART_Receive_DMA(&huart1,a_Usart1_RxBuffer,RXLENGHT); //打开DMA接收，串口空闲中断模式配合DMA进行数据的接收
 （以上两行代码功能：将uart1接收到的数据通过DMA传递给a_Usart1_RxBuffer，然后产生串口空闲中断，在中断中做进一步处理）

void USART1_IRQHandler(void)
{
    /* USER CODE BEGIN USART1_IRQn 0 */
  uint32_t temp;
  
  //判断是否产生空闲中断
  if(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE)  != RESET )
  {
    //清除中断标志
   __HAL_UART_CLEAR_IDLEFLAG(&huart1);
   temp = huart1.Instance->ISR;  //读取寄存器的值
   temp = huart1.Instance->RDR;  //读取寄存器的值
   HAL_UART_DMAStop(&huart1);  //停用DMA  关键点1
   temp  = hdma_usart1_rx.Instance->CNDTR;             
   UsartType1.Usart_rx_len =  RXLENGHT - temp; 
   HAL_UART_RxCpltCallback(&huart1); //调用回调函数，在回调函数中具体实现数据的接收 关键点2
  }
  /* USER CODE END USART1_IRQn 0 */
  HAL_UART_IRQHandler(&huart1);
  /* USER CODE BEGIN USART1_IRQn 1 */

  /* USER CODE END USART1_IRQn 1 */
}

 

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{ 
  uint8_t Old_len = 0;
  
  if(UartHandle->Instance == USART1)//判断是否为USART1中断
  {  
    Old_len = strlen(UsartType1.usartDMA_rxBuf);//读取发送缓冲区UsartType1.usartDMA_rxBuf的长度（如果为0则表示没有数据）
    if(0 != Old_len) /*如果发送缓冲区中还有数据，则将DMA中接收缓冲区a_Usart1_RxBuffer的数据拷贝到发送缓冲区的末尾
                              （不覆盖发送缓冲区前面的数据）*/
    {
      memcpy(&UsartType1.usartDMA_rxBuf[Old_len],a_Usart1_RxBuffer,UsartType1.Usart_rx_len);
      Old_len=0;
    }
    else  /*如果发送缓冲区UsartType1.usartDMA_rxBuf中没有数据，则直接将DMA中接收缓冲区a_Usart1_RxBuffer的数据
                      拷贝到发送缓冲区的起始位置*/
      memcpy(UsartType1.usartDMA_rxBuf,a_Usart1_RxBuffer,UsartType1.Usart_rx_len);
//      UsartxSendData_DMA(&huart1,a_Usart2_RxBuffer,UsartType2.Usart_rx_len);
      memset(a_Usart1_RxBuffer,0,UsartType1.Usart_rx_len);//清空DMA中接收缓冲区a_Usart1_RxBuffer的数据
      HAL_UART_Receive_DMA(&huart1,a_Usart1_RxBuffer,RXLENGHT);//继续打开DMA接收
      UsartType1.receive_flag =1; //接收标识位，置1表示发送缓冲区中有新的数据，提醒相关函数将数据发送出去
  }
}

//**********************************//
//
//函数名称：UartDmaGet   
//
//函数描述：串口数据获取   
//
//函数参数：   无
//
//返回值：     无
//
//创建者： 
//*******************************//

void UartDmaGet(void) //串口接收任务处理函数
{
  if(UsartType1.receive_flag == 1)//如果发送缓冲区中有新的数据，则将其发送给sx1278
  {
    //串口接收到的数据原封发给SX1278，sx1278通过无线将数据发送出去
    Radio->SetTxPacket(UsartType1.usartDMA_rxBuf, UsartType1.Usart_rx_len);
    
    memset(UsartType1.usartDMA_rxBuf,0,UsartType1.Usart_rx_len);
    UsartType1.receive_flag = 0; //接收数据标志清零
  }
}

串口数据结构：

上述代码中使用到的相关变量的定义如下：

#define RXLENGHT  128
#define RECEIVELEN 2048
#define USART_DMA_SENDING       1//发送未完成
#define USART_DMA_SENDOVER      0//发送完成

typedef struct
{
  uint8_t receive_flag ;//空闲接收标记
  uint8_t dmaSend_flag ;//发送完成标记
  uint16_t Usart_rx_len;//接收长度
  uint8_t usartDMA_rxBuf[RECEIVELEN];//无线发送缓存
}USART_RECEIVETYPE;

extern USART_RECEIVETYPE UsartType1;
extern USART_RECEIVETYPE UsartType2;
//
////局部变量
//extern uint8_t g_Usart1_RxBuffer[RXLENGHT]; 
//extern uint8_t g_Usart2_RxBuffer[RXLENGHT]; 
////全局变量
extern uint8_t a_Usart1_RxBuffer[RXLENGHT]; //DMA接收缓存
//extern uint8_t a_Usart2_RxBuffer[RXLENGHT]; 

LCD功能开发：略

无线收发功能开发：（略）

//**********************************//
//
//函数名称：  RxDataPacketNum 
//
//函数描述：  接收数据包计数 
//
//函数参数：   无
//
//返回值：     无
//
//创建者：     
//*******************************//

void RxDataPacketNum(void)
{
  if(EnableMaster == true)
    Master_RxNumber++;
  else
    Slave_RxNumber++;
}
//**********************************//
//
//函数名称：   TxDataPacketNum
//
//函数描述：   发送数据包计数
//
//函数参数：  无 
//
//返回值：     无
//
//创建者：     
//*******************************//

void TxDataPacketNum(void)
{
  if(EnableMaster == true)
    Master_TxNumber++;
  else
    Slave_TxNumber++;
}

最后给出main.c文件的全部代码：

/**
  ******************************************************************************
  * File Name          : main.c
  * Description        : Main program body
  ******************************************************************************
  ** This notice applies to any and all portions of this file
  * that are not between comment pairs USER CODE BEGIN and
  * USER CODE END. Other portions of this file, whether 
  * inserted by the user or by software development tools
  * are owned by their respective copyright owners.
  *
  * COPYRIGHT(c) 2018 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f0xx_hal.h"
#include "adc.h"
#include "dma.h"
#include "spi.h"
#include "usart.h"
#include "gpio.h"
#include <stdio.h>
#include <string.h>
#include "lcd.h"
#include "led.h"
    
#include "logo.h"


//sx1278
#include "platform.h"
#include "radio.h"
#include "sx1276-Hal.h"
#include "sx1276-LoRa.h"
#include "sx1276-LoRaMisc.h"

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private variables ---------------------------------------------------------*/

#define BUFFER_SIZE 128

static uint16_t BufferSize = BUFFER_SIZE;
static uint8_t Buffer[BUFFER_SIZE];

#if defined(MASTER)

static uint8_t EnableMaster = true;

#elif defined(SLAVE)

static uint8_t EnableMaster = false;

#endif


tRadioDriver *Radio = NULL;

static uint32_t Master_RxNumber = 0;
static uint32_t Master_TxNumber = 0;

static uint32_t Slave_RxNumber = 0;
static uint32_t Slave_TxNumber = 0;

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/

/* 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 */
//**********************************//
//
//函数名称：UartDmaGet   
//
//函数描述：串口数据获取   
//
//函数参数：   无
//
//返回值：     无
//
//创建者： 
//*******************************//

void UartDmaGet(void) //串口接收任务处理函数
{
  if(UsartType1.receive_flag == 1)//如果发送缓冲区中有新的数据，则将其发送给sx1278
  {

    //串口接收到的数据原封发给SX1278，sx1278通过无线将数据发送出去
    Radio->SetTxPacket(UsartType1.usartDMA_rxBuf, UsartType1.Usart_rx_len);
    
    memset(UsartType1.usartDMA_rxBuf,0,UsartType1.Usart_rx_len);
    UsartType1.receive_flag = 0; //接收数据标志清零，
  }
}

//**********************************//
//
//函数名称：  RxDataPacketNum 
//
//函数描述：  接收数据包计数 
//
//函数参数：   无
//
//返回值：     无
//
//创建者：     
//*******************************//

void RxDataPacketNum(void)
{
  if(EnableMaster == true)
    Master_RxNumber++;
  else
    Slave_RxNumber++;
}
//**********************************//
//
//函数名称：   TxDataPacketNum
//
//函数描述：   发送数据包计数
//
//函数参数：  无 
//
//返回值：     无
//
//创建者：     
//*******************************//

void TxDataPacketNum(void)
{
  if(EnableMaster == true)
    Master_TxNumber++;
  else
    Slave_TxNumber++;
}
//**********************************//
//
//函数名称：  Sx127xDataGet 
//
//函数描述：   读取sx127x射频射频数据
//
//函数参数：   无
//
//返回值：     无
//
//创建者：    
//*******************************//

void Sx127xDataGet(void)
{
  switch( Radio->Process( ) )
  {
  case RF_RX_TIMEOUT:
    printf("RF_RX_TIMEOUT\n");
    break;
  case RF_RX_DONE:
    Radio->GetRxPacket( Buffer, ( uint16_t* )&BufferSize );
    if(EnableMaster == true)
      printf("master Rx__%s,__,%d,%d\n",Buffer,strlen((char*)Buffer),BufferSize);
    else
      printf("slave Rx__%s,__,%d,%d\n",Buffer,strlen((char*)Buffer),BufferSize);      
    if( BufferSize > 0 )//&& (BufferSize == strlen((char*)Buffer)))
    {
      //接收数据闪烁
      LedBlink( LED_RX );
      //计算接收数据的个数
      RxDataPacketNum();

      //清空sx127x接收缓冲区
      memset(Buffer,0,BufferSize );
    }            
    break;
  case RF_TX_DONE:
    //发送闪烁
    LedBlink( LED_TX );
    //计算发送数据的个数
    TxDataPacketNum();
    Radio->StartRx( );
    break;
  case RF_TX_TIMEOUT:
    printf("RF_TX_TIMEOUT\n");
    break; 
  default:
    break;
  }
}


//**********************************//
//
//函数名称：MLCD_Show   
//
//函数描述：LoRa主机屏幕显示数据   
//
//函数参数：无   
//
//返回值：无  
//
//创建者：     
//*******************************//

void MLCD_Show(void)
{
  
  uint8_t str[20] = {0};
  
  LCD_GPIO_Init();
  
  
  
  sprintf((char*)str,"%d",Master_RxNumber);
  Gui_DrawFont_GBK16(64,48,BLACK,YELLOW,str);
  
  memset((char*)str,0,strlen((char*)str));
  
  
  sprintf((char*)str,"%d",Master_TxNumber);
  Gui_DrawFont_GBK16(64,64,BLACK,YELLOW,str);
  
  HAL_SPI_DeInit(&hspi1);
  MX_SPI1_Init();
}
//**********************************//
//
//函数名称：SLCD_Show   
//
//函数描述：LoRa从机屏幕显示数据    
//
//函数参数：无   
//
//返回值：  无 
//
//创建者：    
//*******************************//

void SLCD_Show(void)
{


  uint8_t str[20] = {0};
  
  LCD_GPIO_Init();
  
  sprintf((char*)str,"%d",Slave_RxNumber);
  Gui_DrawFont_GBK16(64,48,BLACK,YELLOW,str);
  
  memset((char*)str,0,strlen((char*)str));
  
  sprintf((char*)str,"%d",Slave_TxNumber);
  Gui_DrawFont_GBK16(64,64,BLACK,YELLOW,str);
  
  HAL_SPI_DeInit(&hspi1);
  MX_SPI1_Init();
  
}



/* USER CODE END 0 */

int main(void)
{

  /* USER CODE BEGIN 1 */
  
  uint8_t RegVersion = 0;

  /* 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_DMA_Init();
  MX_ADC_Init();
  MX_USART1_UART_Init();
  MX_SPI1_Init();
  
  Lcd_Init();
  showimage(gImage_logo);
  HAL_Delay(500);
  Lcd_Clear(YELLOW);

  Gui_DrawFont_GBK16(0,0,RED,GREEN,"  LoRa Topology  ");
#if defined (SLAVE)  
  Gui_DrawFont_GBK16(0,16,RED,GREEN,"     Slave      ");
#elif defined (MASTER)
  Gui_DrawFont_GBK16(0,16,RED,GREEN,"     Master     ");
#endif
  Gui_DrawFont_GBK16(0,32,BLACK,YELLOW,"SSID:");
  Gui_DrawFont_GBK16(64,32,BLACK,YELLOW,"30");
  
  Gui_DrawFont_GBK16(0,48,BLACK,YELLOW,"RX:");
  Gui_DrawFont_GBK16(0,64,BLACK,YELLOW,"TX:");
  
  
  HAL_SPI_DeInit(&hspi1);
  MX_SPI1_Init();
  
  
  //启动串口1，使能串口空闲中断  
  __HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE); 
  HAL_UART_Receive_DMA(&huart1,a_Usart1_RxBuffer,RXLENGHT); 

  SX1276Read( REG_LR_VERSION, &RegVersion );
  
  if(RegVersion != 0x12)
  {
    printf("LoRa read Error!\r\n");
    printf("LoRa RegVersion = %d!\r\n",RegVersion);
  
  }
  else
  {
    printf("LoRa read Ok!\r\n");
    printf("LoRa RegVersion = %d!\r\n",RegVersion);
  
  
  
  }
  
  //读到版本号后，关闭3种灯
  LedOff(LED_RX);
  LedOff(LED_TX);
  LedOff(LED_NT);
  
  Radio = RadioDriverInit();
  
  Radio->Init();
  
  
  printf("systerm init ok!");
  
  
  Radio->StartRx( );                    


  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
    
    UartDmaGet();
    
    Sx127xDataGet();
    if(EnableMaster == true)
    {
     MLCD_Show();

    }
    else
    {
      SLCD_Show();
    }

  }
  /* USER CODE END 3 */

}

/** System Clock Configuration
*/
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_HSI14|RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
  RCC_OscInitStruct.HSI14CalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
  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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK1;
  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 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @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

/**
   * @brief Reports the name of the source file and the source line number
   * where the assert_param error has occurred.
   * @param file: pointer to the source file name
   * @param line: assert_param error line source number
   * @retval None
   */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
    ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */

}

#endif


int fputc(int ch,FILE *f)
{
  
  while((USART1->ISR&0X40) == 0);
  
  USART1->TDR = (uint8_t)ch;
  
  return ch;
  
}


/**
  * @}
  */ 

/**
  * @}
*/ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/