实验效果3-TCP服务器+OLED

1 拷贝显示驱动代码

1.1 拷贝源代码

拷贝HARDWARE文件夹，里面包括OLED.c/.h和移植好的U8g2csrc文件夹

1.2 将源代码添加到工程

将代码分别添加到工程的User/OLED组和User/U8G2组（所有.c文件都添加）

1.3 修改代码优化等级

这里添加的好多文件用不到，需要把代码优化等级调整到Level 1

1.4 添加头文件路径

…\HARDWARE\oled
…\HARDWARE\U8g2csrc

1.5 修改STM32CubeMX工程

只需要添加3个控制引脚，SPI和W5500是共用的

2 修改源代码

源代码全部在main.c里面修改

2.1 添加头文件

/* USER CODE BEGIN Includes */
#include <string.h>
#include <stdio.h>
#include "w5500_spi.h"
#include "wizchip_conf.h"
#include "socket.h"
#include "OLED.h"
#include "u8g2_app.h"
/* USER CODE END Includes */

2.2 main函数修改

局部变量

/* USER CODE BEGIN 1 */
  u8g2_t u8g2;
  char draw_buf[20];
/* USER CODE END 1 */

显示初始化

  /* USER CODE BEGIN 2 */
  OLED_RST_Set();//OLED初始化
  HAL_Delay(100);
  OLED_RST_Clr();
  HAL_Delay(200);
  OLED_RST_Set();
  OLED_Init();

  u8g2Init(&u8g2);//U8G2初始化
  u8g2_FirstPage(&u8g2);
  
  printf("A simple TCP Server Application using W5500!\r\n");
  W5500Init();                                     //W5500初始化
  ctlnetwork(CN_SET_NETINFO, (void*)&gWIZNETINFO); //配置网络参数
  
  wiz_PhyConf phyconf;
  phyconf.by = PHY_CONFBY_SW;
  phyconf.duplex = PHY_DUPLEX_FULL;
  phyconf.speed = PHY_SPEED_10;
  phyconf.mode = PHY_MODE_AUTONEGO;
  ctlwizchip(CW_SET_PHYCONF, (void*)&phyconf);     //配置PHY参数
  
  draw_waitcable(&u8g2);//OLED提示：等待网线连接
  
  PHYStatusCheck();                                //检查网络连接状态
  PrintPHYConf();                                  //打印PHY配置信息
  printf("Simple TCP Server Application\r\n");
  draw_waitclient(&u8g2);//OLED提示：等待客户端连接
  /* USER CODE END 2 */

主循环
添加的代码部分有“OLED提示：”注释

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

    /* USER CODE BEGIN 3 */
    printf("\r\nInitializing server socket\r\n");

	  //Parameters in order socket_id, protocol TCP or UDP, Port number, Flags=0
	  //Return value is socket ID on success
	  if(socket(1,Sn_MR_TCP,LISTEN_PORT,0)!=1)//创建一个socket：Socket号，TCP/UDP类型，端口号
	  {
		  //error
		  printf("Cannot create Socket!\r\n");
		  while(1);//halt here
	  }

	  //success
	  printf("Socket Created Successfully ! \r\n");

	  uint8_t socket_io_mode=SOCK_IO_BLOCK;

	  ctlsocket(1, CS_SET_IOMODE , &socket_io_mode);//set blocking IO mode

    printf("IP Address is %d.%d.%d.%d\r\n",gWIZNETINFO.ip[0],gWIZNETINFO.ip[1],gWIZNETINFO.ip[2],gWIZNETINFO.ip[3]);
	  printf("Start listening on port %d ! \r\n",LISTEN_PORT);
	  printf("Waiting for a client connection. \r\n");
    
    memset(draw_buf,0,20);
    snprintf(draw_buf,20,"%d.%d.%d.%d:%d",gWIZNETINFO.ip[0],gWIZNETINFO.ip[1],gWIZNETINFO.ip[2],gWIZNETINFO.ip[3],LISTEN_PORT);
    draw_server(&u8g2,draw_buf);//OLED提示：等待客户端连接
	  //Make it a passive socket (i.e. listen for connection)
	  if(listen(1)!=SOCK_OK)//监听端口
	  {//our socket id is 1 (w5500 have 8 sockets from 0-7)
		  //error
		  printf("Cannot listen on port %d",LISTEN_PORT);
		  while(1);
	  }

	  uint8_t sr=0x00;//socket status register

	  do
	  {
		  sr=getSn_SR(1);//获取Sn_SR寄存器，参数0~7 
	  }while (sr!=SOCK_ESTABLISHED && sr!=SOCK_CLOSED);

	  if(sr==SOCK_CLOSED)
	  {
		  printf("Some error occurred on server socket. Please restart.\r\n");
		  while(1);
	  }

	  if(sr==SOCK_ESTABLISHED)//成功连接
	  {
		  //we come here only when a client has connected.
		  //Now we can read data from the socket
		  printf("A client connected!\r\n");
		  printf("Waiting for Client Data ...!\r\n");
      draw_conn_client(&u8g2);//OLED提示：客户端连接
		  while(1)
		  {
			  int len=recv(1, receive_buff, RECEIVE_BUFF_SIZE);//从连接设备读取数据到receive_buff

			  if(len==SOCKERR_SOCKSTATUS)
			  {
				  //client has disconnected
				  printf("Client has disconnected\r\n");
				  printf("*** SESSION OVER ***\r\n\r\n");
				  break;
			  }

			  receive_buff[len]='\0';

			  printf("Received %d bytes from client\r\n",len);
			  printf("Data Received: %s", receive_buff);
        
//        memset(draw_buf,0,20);
//        snprintf(draw_buf,20,"%d.%d.%d.%d:%d",gWIZNETINFO.ip[0],gWIZNETINFO.ip[1],gWIZNETINFO.ip[2],gWIZNETINFO.ip[3],LISTEN_PORT);
        draw_waitdata(&u8g2,(char *)receive_buff);//OLED提示：显示接收数据
        
        if(strcmp((char*)receive_buff,"Who are u")==0)
			  {//判断接收到"Who are u"
				  memcpy(receive_buff,"I am role_2099!",15);//修改应答内容
          len = 15;
			  }
			  //Echo the data back encloused in a [] pair
			  send(1,(uint8_t*)"[",1);//starting sq bracket 向客户端发送[
			  send(1,receive_buff,len);// the data          向客户端发送接收到的内容或者特定的回答
			  send(1,(uint8_t*)"]",1);//closing sq bracket  向客户端发送]

			  printf("\r\nECHO sent back to client\r\n");

			  //Look for quit message and quit if received
			  if(strcmp((char*)receive_buff,"QUIT")==0)
			  {//收到"QUIT"，端口客户端连接
				  printf("Received QUIT command from client\r\n");
				  printf("Disconnecting ... \r\n");
				  printf("*** SESSION OVER ***\r\n\r\n");
          memset(draw_buf,0,20);
          snprintf(draw_buf,20,"%d.%d.%d.%d:%d",gWIZNETINFO.ip[0],gWIZNETINFO.ip[1],gWIZNETINFO.ip[2],gWIZNETINFO.ip[3],LISTEN_PORT);
          draw_server(&u8g2,draw_buf);//OLED提示：等待客户端连接
				  disconnect(1);//disconnect from the clinet 断开客户端连接
				  break;//come out of while loop 退出，回到131行，重新等待客户端连接
			  }

		  }//While loop (as long as client is connected)

	  }//if block, client connect success
  }
  /* USER CODE END 3 */

3 实验测试效果