【米尔王牌产品MYD-Y6ULX-V2开发板试用体验】创建TCP通信

【米尔王牌产品MYD-Y6ULX-V2开发板试用体验】驱动OLED SSD1306 - 米尔科技 - 电子技术论坛 - 广受欢迎的专业电子论坛! (elecfans.com)
在上个驱动ssd1306的基础上，新增tcp_server的通信。
修改main.c主程序如下：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <pthread.h>
#include "ssd1306.h"

#define SERVER_PORT 3861
#define LISENT_NUM 10



int main()
{
  int sfd, cfd;
  struct sockaddr_in clientaddr;
  struct sockaddr_in serverAddr;
  char buff[1024];
  int size = sizeof(struct sockaddr);
  pthread_t client_thread[LISENT_NUM];

	SSD1306_init();
	SSD1306_clearDisplay();
  SSD1306_setBrightness(255);

  SSD1306_setPageMode();
	SSD1306_setTextXY(0,0);
	SSD1306_putString("HELLO MYD-Y6ULX!");
  SSD1306_setTextXY(1,0);
  SSD1306_putString("SSD1306 DEMO");
  SSD1306_setTextXY(2,0);
  SSD1306_putString("2022-11-07");
  if((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) 
    {
        perror("socket");
        exit(-1);
    }

    memset(&serverAddr, 0, sizeof(struct sockaddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = INADDR_ANY;
    serverAddr.sin_port = htons(SERVER_PORT);

    if (bind(sfd, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr)) == -1)
	{
		perror("bind");
		close(sfd);
		exit(-1);
    }
    if(listen(sfd, LISENT_NUM) == -1)
    {
        perror("listen");
        close(sfd);
        exit(-1);
    }

    printf("#@ listen SERVER_PORT %d\n", SERVER_PORT);
    printf("main: server waiting connect...\n");

    if ((cfd = accept(sfd, (struct sockaddr *)&clientaddr, (socklen_t*)&size)) == -1)
	{
		perror("accept");
		close(sfd);
		return 0;
	}
    printf("client (ip = %s : SERVER_PORT = %d) connect success\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
	usleep(1000*10);
        if (send(cfd, "hello Purple Pi", 6, MSG_NOSIGNAL) == -1)
        {
            perror("send");
            exit(-1);
        }
        printf("send: hello Purple Pi\n");
        usleep(1000*10);
  while (1)
    {
        if(recv(cfd, buff, sizeof(buff), 0) == -1)
        {
            perror("recv");
            exit(-1);
        }
            printf("receive: %s\n", buff);
            SSD1306_setTextXY(4,0);
            SSD1306_putString(buff);
        
    }
  close(ssd1306_i2c_devfd);
	return 0;
}