I am facing problem while working with 89s52 kindly give me suggestion

[Tushar_27]

I am trying to design simple toll system using 89s52. I am using hc-sro4 ultasonic sensorand sg90 servo motor and connction are done according to code
But whenever i am trying to test hardware it on hardware ultasonic sensor does not send trig signal as well as servo motor is not rotating. I have checked them whether they are working or not. But they working fine.
this is my code

    #include <regx52.h>   // Include 89S52 register definitions
#include <intrins.h>
#define trigPin P1_0   // Define trigPin as pin P1.0
#define echoPin P1_1   // Define echoPin as pin P1.1
 #define servoPin P1_2  // Define servoPin as pin P1.2

sbit LED = P2^0;       // Define LED pin as P2.0
unsigned long tmeduration;
 int distance;
 int servoAngle;
unsigned int pulseWidth;
 int i;

void delay_us(unsigned int us) {
 while (us--) {
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    _nop_();
    }
    }

void init() {
TMOD = 0x01;       // Set timer0 as 16-bit timer
TH0 = 0x00;        // Initialize timer0 high byte
TL0 = 0x00;        // Initialize timer0 low byte
TR0 = 0;           // Stop timer0
ET0 = 0;           // Disable timer0 interrupt
    }

void servoWrite(int angle) {
  
    servoAngle = angle;
pulseWidth = (500 + (servoAngle * 10));
for(i=0;i<=50;i++)
    {
servoPin = 1;
    delay_us(pulseWidth);
servoPin = 0;
delay_us(20000 - pulseWidth);
    }
    }


void main() {
    init();

while (1) {
LED = 0;
P3 &= ~(1 << 0);     // Set trigPin low
delay_us(2);
P3 |= (1 << 0);      // Set trigPin high
delay_us(10);
P3 &= ~(1 << 0);     // Set trigPin low

while (!(P3 & (1 << 1)));  // Wait for echoPin to go high
TH0 = 0;                    // Reset timer0 high byte
TL0 = 0;                    // Reset timer0 low byte
TR0 = 1;                    // Start timer0
while (P3 & (1 << 1));      // Wait for echoPin to go low
TR0 = 0;                    // Stop timer0

tmeduration = (TH0 << 8) | TL0;  // Calculate pulse duration
distance = (0.034 * tmeduration) / 2;  // Calculate distance in cm

if (distance <= 10) {
servoWrite(90);
LED = 1;
} else {
servoWrite(0);
LED = 0;
    }

delay_us(50);
    }
    }

[code tags added by moderator]

 

[FvM]

If one echo pulse from HC-SR04 is missing, code execution will hang forever.

You want to create debug features in the code to determine which parts are executing at all.

 

[Tushar_27]

Yes. I want a solution so that all code will be run smoothly