ledkey.c

单片及c语言轻松入门的随书光盘

/*用rtos编写键盘操作控制LED流水灯*/
//采用52作为CPU，选择操作系统为rtx tiny
//如果采用51为CPU，须修改conf_tny.a51
//2003.2.24通过硬件测试
#include "reg51.h"
#include "intrins.h"
#include <rtx51tny.h> /* RTX51 tiny functions & defines */
#define uchar unsigned char
#define uint unsigned int
#define Init 0          //初始化
#define Led  1		//LED闪烁定为任务2
#define Key  2      //键盘操作定义为任务3
bit     StartLedFlash;	//开始/停止LED流动
bit     LeftRight;		//控制流动向左或向右
void job0 (void ) _task_ Init {
os_create_task (Led); /* start task Disp */
os_create_task (Key);
os_delete_task (0);
}

void LedFlash(void) _task_ Led{
	static uchar FlashLed=0xfe;
	while(1)
	{	if(StartLedFlash)
		{
			P1=FlashLed;
			if(LeftRight)
				FlashLed=_crol_(FlashLed,1);
			else
				FlashLed=_cror_(FlashLed,1);
		}
		os_wait(K_IVL,100,0);		//等待1秒
	}
}
void KeyValue(uchar KeyV)
{	if((KeyV|0xfb)!=0xff)	//11111011 P3.2位被按下
	{	StartLedFlash=1;
	}
	else if((KeyV|0xf7)!=0xff)
	{	StartLedFlash=0;
	}
	else if((KeyV|0xef)!=0xff)
	{	LeftRight=1;
	}
	else if((KeyV|0xdf)!=0xff)
	{	LeftRight=0;
	}
}

void KeyProcess(void) _task_ Key{
	uchar tmp;
	while(1)
	{	P3|=0x3c;	//中间4位置高电平
		tmp=P3;
		tmp|=0xc3;	//两边4位置高电平
		if(tmp!=0xff)
			KeyValue(tmp);
		os_wait(K_IVL,2,0);
	}
}