p18_1.c

单片机原理与应用实例教程 单片机原理与应用实例教程

#include	 "REG51.h"
sbit P0_0 = P0^0;
sbit P3_2 = P3^2;
void Delay()						//延时函数
{
	unsigned char i, j;
	for( i = 0; i < 28; i ++ )
	{
		for( j = 0; j < 88; j ++ )
		{
		}
	}
}
void Sound()						//音效播放函数
{
	unsigned char i, j;
	bit c = 0;
	for( i = 0; i < 228; i ++ )
	{
		c = !c;
		P0_0 = c;
		for( j = 0; j < 0xff; j ++ )
		{
		}
	}
}
main()
{
	SP = 0x60;
	P0 = 0xff;
	P1 = 0xff;
	P2 = 0xff;
	P3 = 0xff;
	while( 1 )
	{
		if( P3_2 == 0 )
		{
			Delay();


			if( P3_2 == 0 )
			{
				Sound();
			}
		}
	}
}