i am trying to make a ultra sonic sensor using 8051 , but getting this internal exception error . i have used proteus , and the hex file created from the code for 8051 is
#include<REGX51.h>
#include<intrins.h> // for using _nop_() function
#define data_port P2
sbit trig=P3^5;
sbit echo=P3^2;
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
void delay_ms(unsigned int msec)
{
int i,j;
for(i=0;i<msec;i++)
for(j=0;j<1275;j++);
}
void lcd_cmd(unsigned char dat) // Function to send command to LCD
{
data_port = dat;
rs= 0;
rw=0;
en=1;
delay_ms(1);
en=0;
}
void lcd_data(unsigned char dat) // Function to send data to LCD
{
data_port = dat;
rs= 1;
rw=0;
en=1;
delay_ms(1);
en=0;
}
void lcd_string(unsigned char *str) // Function to send string to LCD
{
int i=0;
while(str!='\0')
{
lcd_data(str);
i++;
delay_ms(1);
}
}
void lcd_number(int val,unsigned int field_length) // Function to display number
{
char str[5]={0,0,0,0,0};
int i=4,j=0;
while(val)
{
str=val%10;
val=val/10;
i--;
}
if(field_length==-1)
while(str[j]==0) j++;
else
j=5-field_length;
if(val<0) lcd_data('-');
for(i=j;i<5;i++)
{
lcd_data(48+str);
}
}
void send_pulse(void) //to generate 10 microseconds delay
{
TH0=0x00;
TL0=0x00;
trig=1;
_nop_();_nop_();_nop_();_nop_();_nop_(); //each _nop_() generates 1u sec of delay
_nop_();_nop_();_nop_();_nop_();_nop_();
trig=0;
}
unsigned int get_range(void)
{
int range=0;
int timerval;
send_pulse();
while(!INT0);
while(INT0);
timerval = TH0;
timerval = (timerval <<
| TL0;TH0=0xFF;
TL0=0xFF;
lcd_cmd(0xc0);
delay_ms(2);
lcd_string("Distance:");
lcd_cmd(0xc9);
if(timerval<35000) //actually you need to use 38000 but the sensor may not work at higher levels
{
range=timerval/59;
}
else
{
range = 0;
}
lcd_number(range,3);
lcd_string("cm");
return range;
}
void main()
{
lcd_cmd(0x38);
lcd_cmd(0x0c);
delay_ms(2);
lcd_cmd(0x01);
delay_ms(2);
lcd_cmd(0x80);
delay_ms(2);
lcd_string("Range finder");
delay_ms(20);
TMOD=0x09;//timer0 in 16 bit mode with gate enable
TR0=1;//timer run enabled
TH0=0x00;
TL0=0x00;
echo = 1; //setting pin P3.2
while(1)
{
get_range();
delay_ms(2);
}
}
whereas the code for ultrasonic used is
const int pingPin = 7; // Trigger Pin of Ultrasonic Sensor
const int echoPin = 6; // Echo Pin of Ultrasonic Sensor
void setup()
{
Serial.begin(9600); // Starting Serial Terminal
}
void loop()
{
long duration, inches, cm;
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(10);
digitalWrite(pingPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
long microsecondsToInches(long microseconds)
{
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds)
{
return microseconds / 29 / 2;
}
Can anyone guide me in this ??
ill Be greatfull
