#include <reg52.h>
#include <intrins.h>

sfr P3M0 = 0xb2;
sfr P3M1 = 0xb1;
sfr P5M0 = 0xca;
sfr P5M1 = 0xc9;

sfr P5 = 0xc8;

sbit negative = P3^3;
sbit positive = P3^2;
sbit synchronous = P5^5;
void Delay1ms()		//@30.000MHz
{
	unsigned char i, j;

	_nop_();
	_nop_();
	i = 39;
	j = 243;
	do
	{
		while (--j);
	} while (--i);
}


void delay_ms(unsigned int ms)
{
		unsigned int a ;
		for (a = 0;a<ms;a++)
		{
			Delay1ms();
		}
}


void main(void)
{
	P3M0 = 0xff;
	P3M1 = 0x00;
	P5M0 = 0xff;
	P5M1 = 0x00;  //设置推挽输出模式
	
	while(1)
	{
		positive = 1;
		negative = 0;
		synchronous = 1;
		delay_ms(2000);
		
		positive = 0;    //放电
		synchronous = 0;
		delay_ms(100);
		
		positive = 0;
		negative = 1;
		synchronous = 0;
		delay_ms(2000);
		
		negative = 0;    //放电
		synchronous = 1;
		delay_ms(100);
	}
	
}