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Code Keil C:
#include <AT89X52.H>
#include <stdio.h>
#define Line_1 0x80
#define Line_2 0xC0
#define Clear_LCD 0x01
#define CPU_F 25000
#define LCD_RS P0_0
#define LCD_WR P0_1
#define LCD_EN P0_2
//Dinh Nghia Cac Chan DaTa
#define LCD_D4 P2_4
#define LCD_D5 P2_5
#define LCD_D6 P2_6
#define LCD_D7 P2_7
#define TRIGGER P1_7
#define ECHO P3_2
unsigned char range_ok;
unsigned int distance;
float range;
//unsigned long range=0xffffffff;
float temp1;
//unsigned int temp1;
bit trans_busy;
//unsigned char str1[1];
unsigned char data_recv[10];
unsigned char index;
void delay_us(unsigned int time)
{
unsigned int temp;
for(temp=0;temp<time;temp++);
}
void delay_ms(unsigned int time)
{
unsigned int i,j;
for(i=0;i<time;i++)
for(j=0;j<125;j++);
}
void StartRange()
{
TRIGGER=1;
delay_ms(12); // Phai tao 1 xung len co do lon it nhat 10ms
ECHO=1; // set chan ECHO la cong vao
delay_us(1);
TRIGGER=0; // Bat dau phep do.
while(!(ECHO)); // Doi cho den khi chan ECHO duoc keo len cao
//TR0=1; // Cho phep timer 0 hoat dong
TR0=IT0=EX0=EA=1;// cho phep ngat toan cuc
}
void lcd_enable_pulse(void)
{
LCD_EN=1;
delay_us(1);
LCD_EN=0;
delay_us(1);
}
void lcd_send_4bit_data ( unsigned char Data )
{
LCD_D4= Data&0x01;
LCD_D5=((Data>>1)&1);
LCD_D6=((Data>>2)&1);
LCD_D7=((Data>>3)&1);
}
#ifdef USE_LCD_READ
unsigned char lcd_read_4bit_data(void)
{
unsigned char n = 0x00;
/* Read the data port */
n |= LCD_D4;
n |= (LCD_D5) << 1;
n |= (LCD_D6) << 2;
n |= (LCD_D7) << 3;
return(n);
}
unsigned char lcd_read_byte(void)
{
unsigned char low,high;
LCD_D4=LCD_D5=_LCD_D6=_LCD_D7=1;
LCD_RS=1;
delay_us(1);
LCD_EN=1;
delay_us(1);
high = lcd_read_4bit_data();
LCD_EN=0;
delay_us(1);
LCD_EN=1;
delay_us(1);
low = lcd_read_4bit_data();
LCD_EN=0;
return( (high<<4) | low);
}
char lcd_getc(unsigned char x, unsigned char y) //lay 1 ky tu tai dia chi x,y
{
char value;
lcd_gotoxy(x,y);
// Wait until busy flag is low.
while(bit_test(lcd_read_byte(),7));
LCD_RS=1;
value = lcd_read_byte();
LCD_RS=0;
return(value);
}
#endif
void lcd_send_command (unsigned char Data )
{
#ifdef USE_LCD_READ
while ( 0x80&lcd_read_byte() ) ;
#else
delay_us(20);
#endif
lcd_send_4bit_data ( Data >>4 ); /* send 4 bit high */
lcd_enable_pulse () ;
lcd_send_4bit_data ( Data ); /* send 4 bit low */
lcd_enable_pulse () ;
}
void lcd_init ( void )
{
lcd_send_4bit_data ( 0x00 );
delay_ms(10); //Was 200
LCD_RS=0; // che do gui lenh
LCD_WR=0; // che do ghi
LCD_EN=0;
lcd_send_4bit_data ( 0x03 ); // ket noi 8 bit
lcd_enable_pulse () ;
lcd_enable_pulse () ;
lcd_enable_pulse () ;
lcd_send_4bit_data ( 0x02 ); // ket noi 4 bit
lcd_enable_pulse () ;
lcd_send_command( 0x2C ); // giao thuc 4 bit, hien thi 2 hang, ki tu 5x8
delay_ms(5);
lcd_send_command( 0x80);
lcd_send_command( 0x0c); // cho phep hien thi man hinh
lcd_send_command( 0x06 ); // tang ID, khong dich khung hinh
delay_ms(5);
lcd_send_command( Clear_LCD ); // xoa toan bo khung hinh
delay_ms(10);
}
void lcd_gotoxy(unsigned char x, unsigned char y)
{
unsigned char address;
if(!y)
address = (Line_1+x);
else
address = (Line_2+x);
delay_us(1000);
lcd_send_command(address);
delay_us(50);
}
void lcd_clear()
{
lcd_send_command( Clear_LCD );
delay_us(10);
}
void lcd_putchar ( unsigned int Data )
{
LCD_RS=1; // che do gui du lieu
lcd_send_command( Data );
LCD_RS=0; // che do gui lenh
}
void lcd_puts(char *s)
{
while (*s)
{
lcd_putchar(*s);
s++;
}
}
void init_timer1()
{
TMOD &= ~(0x20);// setup mode for timer 1
TMOD |= 0x20;
// Baud rate = 9600
// PCON.7 = 0, without increasing baud rate 2 times
TL1 = 0xFD; //-3
TH1 = 0xFD; //-3
TR1 = 1; //start timer1
}
void initUart()
{
//IE = 0xb0;
//SCON: SM0 SM1 SM2 REN TB8 RB8 TI RI
ES = 1; // enable UART
IP = 0x10; // set priority for serial port
SCON = 0x50; // Uart mode 1
PCON=PCON&(~(0x80));
}
void sendChar(unsigned char c)
{
trans_busy = 1;
SBUF = c;
while(trans_busy);
}
void sendStr(char *s)
{
while (*s)
{
sendChar(*s);
s++;
}
}
void uart_isr(void) interrupt 4
{
if (TI == 1)
{
trans_busy = 0;
TI = 0;
}
if (RI == 1)
{
data_recv[index] = SBUF;
RI = 0;
}
}
void ngatngoai0(void)interrupt 0
{
distance=TH0;
distance<<=8;
distance|=TL0;
range=(float)distance*12;
temp1=((58*11.0592));
//temp1= 641;
range=range/(temp1);
TR0=IT0=EX0= 0; // Ngung timer
TL0=TH0=0; // Xoa du lieu trong thanh ghi Timer 0
range_ok=1;
}
void main()
{
char str[20];
char str2[20];
LCD_Init();
TMOD=0x01;
EA=1;
init_timer1();
initUart();
//while(1)
{
sprintf(str, "Khoang Cach La:");
lcd_gotoxy(0,0);
lcd_puts(str);
delay_ms(400);
}
while(1)
{
if(!range_ok)
{
StartRange();
delay_ms(100);
}
if(range_ok)
{
//sprintf(str, "Khoang Canh La:");
sprintf(str,"\n Distance: %u ",distance);
sprintf(str2,"Range: %6.2f Cm",range);
lcd_gotoxy(0,0);
lcd_puts(str);
lcd_gotoxy(0,1);
lcd_puts(str2);
sendStr(str);
sendStr(str2);
delay_ms(200);
range_ok=0;
}
}
}
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