/*
 * Linux User & Developer LCD interfacing example code.
 *
 */
#include <stdio.h>
#include <asm/io.h>
#define BASE			0x378
#define BASE_DATA		(BASE+0)
#define BASE_STATUS		(BASE+1)
#define BASE_CONTROL		(BASE+2)
#define ENABLE_ON 0
#define ENABLE_OFF 1
#define WRITE_DATA 2
#define READ_DATA 0
#define I_COMMAND 0
#define D_COMMAND 4
#define COMMAND_FUNCTION_SET	0x38
#define COMMAND_ENTRY_MODE 0x06
#define COMMAND_DISPLAY_ON 0x18
#define COMMAND_CLEAR_DISPLAY 0x01
void function_set(void);
void display_on(void);
void lcd_init(void);
void lcd_printf(const char *string);
static inline void instruction_write(void) {
 outb(I_COMMAND&#124;WRITE_DATA, BASE_CONTROL);
 outb(ENABLE_ON&#124;I_COMMAND&#124;WRITE_DATA, BASE_CONTROL);
 usleep(1);
 outb(ENABLE_OFF&#124;I_COMMAND&#124;WRITE_DATA, BASE_CONTROL);
 usleep(1);
}
void function_set(void) {
 outb(COMMAND_FUNCTION_SET, BASE_DATA);	// Set function.
 instruction_write();
}
void entry_mode(void) {
 outb(COMMAND_ENTRY_MODE, BASE_DATA);
 instruction_write();
}
void display_on(void) {
 
 outb(COMMAND_DISPLAY_ON, BASE_DATA);
 instruction_write();
}
void clear_display(void) {
 outb(COMMAND_CLEAR_DISPLAY, BASE_DATA);
 instruction_write();
}
void lcd_init(void) {
	ioperm(BASE, 3, 1);		// request IO access
	function_set();
	function_set();
	entry_mode();
	display_on();
	clear_display();
}
void lcd_putchar(const char data) {
 outb(D_COMMAND&#124;WRITE_DATA, BASE_CONTROL);
 outb(data, BASE_DATA);
 outb(ENABLE_ON&#124;D_COMMAND&#124;WRITE_DATA, BASE_CONTROL);
 usleep(1);
 outb(ENABLE_OFF&#124;D_COMMAND&#124;WRITE_DATA, BASE_CONTROL);
 usleep(1);
}
void lcd_printf(const char *string) {
 unsigned int i = 0;
 for (i=0;i<strlen(string);i++)
 lcd_putchar(string[i]);
}
int main(int argc, char **argv) {
	
	printf("Linux User & Developer LCD interfacing example.\n");
	printf("Initialising display...");
	lcd_init();
	printf("done\n");
	printf("Printing Hello World text...");
	lcd_printf("Linux User");
	printf("done\n");
}
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