#include
//#include "REG51.h"
//#include "intrins.h"
// Define P3 pins
#define DATA_BUS (P0)
#define RS (P2.0)
#define RW (P2.1)
#define E (P2.2)
// Define new types
typedef unsigned char uchar;
typedef unsigned int uint;
// Function Prototypes
void check_busy(void);
void write_command(uchar com);
void write_data(uchar data);
void LCD_init(void);
void string(uchar ad ,uchar *s);
void lcd_test(void);
void delay(uint);
void main(void)
{ LCD_init();
while(1)
{ string(0x80,"fire!");
string(0xC0," Proteus VSM");
delay(100);
write_command(0x01);
delay(100);
}
}
/*******************************************
LCD1602 Driver mapped as IO peripheral
*******************************************/
// Delay
void delay(uint j)
{ uchar i = 60;
for(; j>0; j--)
{ while(--i);
i = 59;
while(--i);
i = 60;
}
}
// Test the Busy bit
void check_busy(void)
{ do
{ DATA_BUS = 0xff;
E = 0;
RS = 0;
RW = 1;
E = 1;
__no_operation();
} while(DATA_BUS & 0x80);
E = 0;
}
// Write a command
void write_command(uchar com)
{ check_busy();
E = 0;
RS = 0;
RW = 0;
DATA_BUS = com;
E = 1;
__no_operation();
E = 0;
delay(1);
}
// Write Data
void write_data(uchar data)
{ check_busy();
E= 0;
RS = 1;
RW = 0;
DATA_BUS = data;
E = 1;
__no_operation();
E= 0;
delay(1);
}
// Initialize LCD controller
void LCD_init(void)
{ write_command(0x38); // 8-bits, 2 lines, 7x5 dots
write_command(0x0C); // no cursor, no blink, enable display
write_command(0x06); // auto-increment on
write_command(0x01); // clear screen
delay(1);
}
// Display a string
void string(uchar ad, uchar *s)
{ write_command(ad);
while(*s>0)
{ write_data(*s++);
delay(100);
}
}
