Embedded C code for UART serial communication

#include<reg51.h>
//#include"delay.h"
//#include"74hc595.h"

#ifndef _74hc595_h_
#define _74hc595_h_
sbit ds=P3^0;	//connect to serial input pin of 74hc595
sbit clk=P3^1;	//connect to clock input
sbit _mr=P3^2;	//connect to reset input
#define rst_74hc595_mr=0;_mr=1;	//to reset a device
//routine to convert 8bit parellel to 1bit serial msb first
void write_74hc595(unsigned char dat)
{
unsigned char i;
	for(i=0;i<=7;i++)
	{
		clk=0;
		ds=(dat&(0x80>>1))?1:0;
		clk=1;
	}
//extra clock for moving from shift register to storage register
	clk=0;
	clk=1;
//rst_74hc595 //reset shift register(optional)
}



void main()
{
unsigned int i;
for(i=0;i<=255;i++)
{
write_74hc595(i);
//delay_ms(500);
}
while(1);
}

Categories: 8051, Embedded C, embedded programming