leddriver.c

音响效果程序

#include <reg52.h>
#include "LedDriver.h"

code unsigned char LedHexCode[]=
	{
		//0     1     2     3     4     5     6     7
		0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 
		//8     9     a     b     c     d     e     f
		0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71,
		//-     H     L     P     o
		0x40, 0x76, 0x38, 0x73,	0x5c,

	};

unsigned char DisBuf[4];
unsigned int LedInterval=1;
/*
void LedPrint( unsigned char bitN, unsigned char Dat )
{	DisBuf[ bitN ] = Dat; }
*/
 
void LedOutput( void )
{
	static unsigned char index=0;
	P2 |= 0x0f;
	P0 = LedHexCode[ DisBuf[index] & 0x1f ] | (DisBuf[index]&0x80);
	P2 &= (1<<index)^0xff;
	if( ++index == 4 ) index=0;
} 

void LedSetInterval( unsigned int time ){ LedInterval = time; }

/*下面是延时函数的描述*/
void delayMs( unsigned int tc )	//tc是形参
{
	while( tc != 0 )			//如果tc为0则终止延时
	{
		unsigned int i;			//局部正整数变量 i
		for(i=0; i<400; i++);	//执行400次将耗时1毫秒
		tc--;					//tc计数减一
	}
}

void LedWork( void )
{
	static unsigned int delayTime=1;
	delayMs( 1 );
	if( --delayTime==0 )
	{
		delayTime = LedInterval;
		LedOutput();
	}
}