serial.c

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#include "serial.h"
#include <regx51.h>
#include <absacc.h>

void drv_serial_send(unsigned char b)
{
	unsigned char dt;
	bit flag;
	unsigned char i;

	TI = 0;

	dt = b;
	flag = 0;

	for(i = 0; i < 7; i++)
	{
		if(b & 0x1)
			flag = !flag;
		b = b >> 1;
	}

	TB8 = flag;
	SBUF = dt;

	while(!TI) {}
}