Keli C TEST Code for Atmel AT89S51

89s51-1.c

#include <reg51.h>
#define LED P1

// (c) 2020 SuperSonic (https://github.com/supersonictw)

sbit buzzer = P0 ^ 1;

void delay500us(int);
void pulse_bz(int, int, int);

int main()
{
    int c;
    LED = 0x01;
    buzzer = 0;
    while (1)
    {
        for (c = 0; c < 8; c++)
            LED << 0;
        for (c = 0; c < 8; c++)
            LED >> 0;
        delay500us(6000);
        pulse_bz(100, 10, 10);
        delay500us(100);
        pulse_bz(100, 10, 10);
        delay500us(100);
        pulse_bz(100, 10, 10);
        delay500us(100);
    }
}

void delay500us(int x)
{
    int i, j;
    for (i = 0; i < x; i++)
        for (j = 0; j < 60; j++)
            ;
}

void pulse_bz(int count, int TH, int TL)
{
    int i;
    for (i = 0; i < count; i++)
    {
        buzzer = 1;
        delay500us(TL);
        buzzer = 0;
        delay500us(TH);
    }
}