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#include "reg51.h"
#include "stdio.h"
sbit	HC	= P1 ^ 0;
sbit	HB	= P1 ^ 1;
sbit	HA	= P1 ^ 2;

sbit	AH	= P2 ^ 1;
sbit	BH	= P2 ^ 3;
sbit	CH	= P2 ^ 5;
sbit	AL	= P2 ^ 0;
sbit	BL	= P2 ^ 2;
sbit	CL	= P2 ^ 4;

sbit	START	= P0 ^ 0;
sbit	STOP	= P0 ^ 1;
sbit	ADD	= P0 ^ 2;
sbit	SUB	= P0 ^ 3;
sbit	PPWM	= P1 ^ 5;

bit star = 0;

unsigned char time;  /* 定义占空比的变量 */

int		a, b;
unsigned char	PWM = 0;
unsigned char	count;
HALL[6] = { 0x05, 0x04, 0x06, 0x02, 0x03, 0x01 };
unsigned char	N0, N1;
unsigned char	Flag;
void delay_ms( int n )
{
	for ( a = n; a > 0; a-- )
		for ( b = 100; b > 0; b-- )
			;
}


void Scanhall( unsigned char hall )
{
	unsigned char i;
	for ( i = 0; i < 6; i++ )
	{
		if ( HALL[i] == hall )
		{