lcmlinux.c

嵌入式LINUX下工控机液晶显示屏字符显示程序,通过串口

#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <termio.h>
#include<string.h>
#include<stdio.h>
struct termios  oldtermios;
static int fd;

int ttyraw(int fd , int baud)
 {
        struct termios newtermios;
    if (tcgetattr(fd,&oldtermios)<0) return -1;
            newtermios=oldtermios;
        // all the basic magic for raw mode
         cfmakeraw(&newtermios);
       // input speed setting
         switch(baud){
         case 38400:
        if (cfsetispeed(&newtermios,B38400)<0)
                return -1;
        if(cfsetospeed(&newtermios,B38400)<0)
                return -1;
        break;
        case 57600:
           if(cfsetispeed(&newtermios,B57600)<0)
             return -1;
           if(cfsetospeed(&newtermios,B57600)<0)
             return -1;
           break;
         case 115200:
           if(cfsetispeed(&newtermios,B115200)<0)
             return -1;
           if(cfsetospeed(&newtermios,B115200)<0)
             return -1;
           break;
         case 9600:
           if(cfsetispeed(&newtermios,B9600)<0)
             return -1;
           if(cfsetospeed(&newtermios,B9600)<0)
             return -1;
             break;   
           case 2400:
           if(cfsetispeed(&newtermios,B2400)<0)
             return -1;
           if(cfsetospeed(&newtermios,B2400)<0)
             return -1;
             break;
        case 19200:
           if(cfsetispeed(&newtermios,B19200)<0)
             return -1;
           if(cfsetospeed(&newtermios,B19200)<0)
             return -1;
           break;
         case 300:
           if(cfsetispeed(&newtermios,B300)<0)
             return -1;
           if(cfsetospeed(&newtermios,B300)<0)
             return -1;
           break;
         }
        newtermios.c_cc[VMIN] =1;
          newtermios.c_cc[VTIME] = 0;
          newtermios.c_cflag &= ~PARENB;
          newtermios.c_cflag &= ~CSTOPB;
          newtermios.c_cflag &= ~CSIZE;
          newtermios.c_cflag |= CS8;


          newtermios.c_cflag &= ~CRTSCTS;
          /*
           * *Choosing Raw Input and Output
           * */
          newtermios.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
          newtermios.c_oflag &= ~OPOST;


          /*
           * *To disable software flow control simply mask those bits:
           * */
          //newtermios.c_iflag &= ~(IXON | IXOFF | IXANY);
          newtermios.c_iflag &= (IXON | IXOFF | IXANY);


          if(tcsetattr(fd, TCSAFLUSH, &newtermios) < 0) return -1;
          return 0;
 }

   

void SetEnvironment () {
/*  system("stty ispeed 2400 < /dev/ttyS1");
  system("stty raw < /dev/ttyS1");
*/
}


int Cmd = 254;  /* GTLCM2X16b Command */
int cls = 1;    /* Clear screen */
void Cls () { 
  write(fd,&Cmd,1);
  write(fd,&cls,1);	
}

int init = 0x28;
void Init () {
  write(fd,&Cmd,1);
  write(fd,&init,1);	
}

int stopsend = 0x37;
void StopSend () {
  write(fd,&Cmd,1);
  write(fd,&init,1);	
}

int home = 2	;   /* Home cursor */
void Home () {
  write(fd,&Cmd,1);
  write(fd,&home,1);
}
	
int readkey = 6	;   /* Read key */
void ReadKey () {
  write(fd,&Cmd,1);
  write(fd,&readkey,1);
}

int blank = 8	;   /* Blank display */
void Blank () {
  write(fd,&Cmd,1);
  write(fd,&blank,1);
}

int hide = 12	;   /* Hide cursor & display blanked characters */
void Hide () {
  write(fd,&Cmd,1);
  write(fd,&hide,1);
}

int turn = 13	;   /* Turn On (blinking block cursor) */
void TurnOn () {
  write(fd,&Cmd,1);
  write(fd,&turn,1);
}

int show = 14	;   /* Show underline cursor */
void Show () {
  write(fd,&Cmd,1);
  write(fd,&show,1);
}

int movel = 16	;   /* Move cursor 1 character left */
void MoveL () {
  write(fd,&Cmd,1);
  write(fd,&movel,1);
}

int mover = 20	;   /* Move cursor 1 character right */
void MoveR () {
  write(fd,&Cmd,1);
  write(fd,&mover,1);
}

int scl = 24;  	    /* Scroll cursor 1 character left */
void ScrollL(){
  write(fd,&Cmd,1);
  write(fd,&scl,1);
}

int scr = 28;       /* Scroll cursor 1 character right */
void ScrollR(){
  write(fd,&Cmd,1);
  write(fd,&scr,1);
}

int setdis =  64;/* Command */
void SetDis(){
  write(fd,&Cmd,1);
  write(fd,&setdis,1);
  
 }


/* Add or Change Show Message here */
char mes1[] = "Welcome Gtech";
char mes2[] = "*************";
char mes3[] = "Up is selected";
char mes4[] = "Down is selected";
char mes5[] = "Enter is selected";
char mes6[] = "ESC is selected";
char nul[] = "                                       ";

int a,b;
void ShowMessage (char *str1 , char *str2) {
   a = strlen(str1);
   b = 40 - a;
   write(fd,str1,a);
   write(fd,nul,b);
   write(fd,str2,strlen(str2));
}

int main (int argc,char *argv[]) {
  
  //SetEnvironment();	/* Set RAW mode */
  int baud;
   if(argc<2)
    {
    printf("uagse:./lcd /dev/ttyS1 2400\n");
    exit(2);
    }
  baud=atoi(argv[2]);
  printf("baud:%d\n",baud);
  fd = open(argv[1] ,O_RDWR);/** Open Serial port (COM2) */
  if (ttyraw(fd,baud)!=0) {
      perror("Cannot set raw mode");
      exit(1);
     }
     
	Init(); /* Initialize GTLCM2X16b twice */
        Init();
        
	Cls();	/* Clear screen */
	ShowMessage(mes1,mes2);
	
   while (1) {			
     int res;
     char buf[255];
     
     SetDis();  
     ReadKey(); /* sub-routine to send "read key" command */
     res = read(fd,buf,255); /* read response from GTLCM2X16b */
     
     switch(buf[1]) {        /* Switch the Read command */
     
	case 0x4D : 	/* Up Botton was received */
		   Cls();
	           ShowMessage(mes1,mes3); /** display "Welcome Gtech" */
	           break;                  /** display "Up is selected */
	 

        case 0x47 : 	/** Down Botton was received */
	           Cls();
	           ShowMessage(mes1,mes4);  /** display "Welcome Gtech" */
	           break;                   /** display "Down is selected" */
	 
        case 0x4B :	/** Enter Botton was received */
	           Cls();
	           ShowMessage(mes1,mes5);  /** display "Welcome Gtech" */
	           break;                   /** display "Enter is selected" */
	     
        case 0x4E :	/** Escape Botton was received */
	           Cls();
	           ShowMessage(mes1,mes6);  /** display "Welcome Gtech" */
	           break;                   /** display "Escape is selected */
       } 
 
  }
 
}