Linux example code for Sure Electronics LCD

/*
 * It should be noted that the communication protocol, while somewhat
 * documented in the LCD user's manual, is not complete (ie. the
 * initialization sequence is not described), and inacurate on some points.
 * This driver is so based on the spying of serial communication using the
 * officially supported client softwares (LCD Smarties & SureLCD).
 */

How I made it work.

#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <termios.h>
#include <strings.h>

/* Function Declarations */
void lcd_init(void);
void backlight_on(void);
void backlight_off(void);
void clear_screen(void);
void print_banner(void);
void lcd_close(void);

/* Structures */
struct termios saved_tty_parameters;	/* old serial port setting (restored on close) */
struct termios portset; /* new serial port settings */

int main(int argc, char **argv)
{
lcd_init();
clear_screen();
print_banner();
lcd_close();
exit(0);
}

/****************************
*                           *
*   Subroutines go Below    *
*                           *
****************************/



//************************
//* Init LCD             *
//************************

void lcd_init(void)
{
	unsigned char cmd[3] = {'\xFE', '\x56', 0};
	unsigned char init_seq[7] = {'\x54', '\x58', '\x4B', '\x52', '\x44', '\x41', '\x60'};
	int i;
	
	fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NDELAY);
	if (fd == -1) {
		printf("SHAZBOT! Open failed\n");
		exit(1);
	}
	tcgetattr(fd, &portset);
	tcgetattr(fd, &saved_tty_parameters);

	/* Set port parameters */
	portset.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
			     | INLCR | IGNCR | ICRNL | IXON);
	portset.c_oflag &= ~OPOST;
	portset.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
	portset.c_cflag &= ~(CSIZE | PARENB | CRTSCTS | CSTOPB);
	portset.c_cflag |= CS8 | CREAD | CLOCAL;
	portset.c_cc[VMIN] = 1;
	portset.c_cc[VTIME] = 10;

	/* Set port speed */
	cfsetospeed(&portset, B9600);
	cfsetispeed(&portset, B9600);

	/* Do it... */
	tcsetattr(fd, TCSANOW, &portset);

	
	/* Send initialization sequence */
	for (i = 1; i <= 8; i++) 
	{
		cmd[2] = i;
		if (write(fd, cmd, sizeof(cmd)) == -1)
			{
			  printf("SHAZBOT init failed\n");
			  close(fd);
			  exit(1);
			}
	}

	for (i = 0; i < sizeof(init_seq); i++) 
	{
		if (write(fd, (const unsigned char *)"\xFE", 1) == -1
		    || write(fd, &(init_seq[i]), 1) == -1)
			{
			  printf("SHAZBOT init failed\n");
			  close(fd);
			  exit(2);
			}
	}
	usleep(100000); //sleep 0.1 of a second <- really important
}

//************************
//* LCD Close            *
//************************
void lcd_close(void)
{
	if (tcsetattr (fd,TCSANOW,&saved_tty_parameters) < 0)
    	{
    		printf("Can't restore terminal parameters!\n");
    	}
	close(fd);
}


//************************
//* Back Light OFF       *
//************************
void backlight_off(void)
{
	unsigned char cmd1[2] = {'\xFE', '\x46'};
	if (write(fd, cmd1, sizeof(cmd1)) == -1) 
	{
		printf("Back Light OFF failed!\n");
		close(fd);
		exit(1);	
	}
	usleep(100000); //sleep 0.1 of a second <- really important
}

//************************
//* Back Light ON        *
//************************
void backlight_on(void)
{
	unsigned char cmd_bl[3] = {'\xFE', '\x42', '\x0'};
	if (write(fd, cmd_bl, sizeof(cmd_bl)) == -1) 
	{
		printf("Back Light ON failed!\n");
		close(fd);
		exit(1);
	}
	usleep(100000); //sleep 0.1 of a second <- really important	
}

//************************
//* Clear LCD Screen     *
//************************
void clear_screen(void)
{
	unsigned char row1[4] = {'\xFE', '\x47', '\x01', '\x01'};
	unsigned char row2[4] = {'\xFE', '\x47', '\x01', '\x02'};
	unsigned char row3[4] = {'\xFE', '\x47', '\x01', '\x03'};
	unsigned char row4[4] = {'\xFE', '\x47', '\x01', '\x04'};
	unsigned char spaces[20] = "                    ";
	write(fd, row1, sizeof(row1));
	write(fd, spaces, sizeof(spaces));
	write(fd, row2, sizeof(row2));
	write(fd, spaces, sizeof(spaces));
	write(fd, row3, sizeof(row3));
	write(fd, spaces, sizeof(spaces));
	write(fd, row4, sizeof(row4));
	write(fd, spaces, sizeof(spaces));
	usleep(100000); //sleep 0.1 of a second <- really important
}

//*************************
//* Print EtherTek Banner *
//*************************
void print_banner(void)
{
	unsigned char row1cmd[4] = {'\xFE', '\x47', '\x01', '\x01'};
	unsigned char row2cmd[4] = {'\xFE', '\x47', '\x01', '\x02'};
	unsigned char row3cmd[4] = {'\xFE', '\x47', '\x01', '\x03'};
	unsigned char row4cmd[4] = {'\xFE', '\x47', '\x01', '\x04'};
	unsigned char row1txt[20] = "   RMS-200 System   ";
	unsigned char row2txt[20] = " EtherTek Circuits  ";
	unsigned char row3txt[20] = "  (C) 2001 - 2011   ";
	unsigned char row4txt[20] = "                    ";
	
	write(fd, row1cmd, sizeof(row1cmd));
	write(fd, row1txt, sizeof(row1txt));
	
	write(fd, row2cmd, sizeof(row2cmd));
	write(fd, row2txt, sizeof(row2txt));
	
	write(fd, row3cmd, sizeof(row3cmd));
	write(fd, row3txt, sizeof(row3txt));
	
	write(fd, row4cmd, sizeof(row4cmd));
	write(fd, row4txt, sizeof(row4txt));
	
	usleep(100000); //sleep 0.1 of a second
}