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一、数码管扫描的原理

• ①人的眼睛中的画面在0.02S(50Hz)左右,光源的闪烁频率高于50-60赫兹时，人眼通常无法察觉到光的闪烁；
• ②通过控制LED的亮灭透过模具贴纸从而控制数字和图案的亮灭；

二、display.c的实现

1、void Display(void) 各模式界面定义数据

u8 CxSegData[]={0,0,0,0};	//显示Ram缓存区
//=============================================================================
//函数名称:Display
//输	入:无
//输	出:无
//功	能:界面菜单显示
//=============================================================================
void	Display(void)
{	if(b_Display_Flag== 0) return;		//更新显示b_Display_Flag=0;					//显示标志清0switch(Mode){case 0:					//全灭显示界面CxSegData[0]=0x00;CxSegData[1]=0x00;CxSegData[2]=0x00;CxSegData[3]=0x00;b_Fresh_Flag=1;		//刷新显示Rambreak;case 1:					//全显显示界面CxSegData[0]=0xff;CxSegData[1]=0xff;CxSegData[2]=0xff;CxSegData[3]=0xff;	b_Fresh_Flag=1;		//刷新显示Rambreak;case 2:					//自定义界面显示1CxSegData[3]=Unb_Red;CxSegData[3]=Unb_Inf;CxSegData[3]=Unb_Twi;	//不显示某一个点b_Fresh_Flag=1;		//刷新显示Rambreak;case 3:				  //自定义界面显示2CxSegData[3]=b_Red;CxSegData[3]=b_Inf;CxSegData[3]=b_Twi;	//显示某一个点b_Fresh_Flag=1;		//刷新显示Rambreak;case 4:				 //自定义界面显示2LcdDisplay_8bit(LzLcdNum1,LedNumCoding[6]);LcdDisplay_8bit(LzLcdNum2,LedNumCoding[6]);		//数码管显示66b_Fresh_Flag=1;	//刷新显示Rambreak;case 5:				//自定义界面显示3b_Fresh_Flag=1;	//刷新显示Rambreak;case 6:				//自定义界面显示4b_Fresh_Flag=1;	//刷新显示Rambreak;	}
}

2、void BackupRamToDisRam(void)从缓存区刷新显示映射Ram

u8 CxSeg[]={0,0,0,0};		//显示Ram
//=============================================================================
//函数名称:BackupRamToDisRam
//输	入:无
//输	出:无
//功	能:更新显示RAM
//=============================================================================
void BackupRamToDisRam(void)
{if(b_Fresh_Flag){b_Fresh_Flag=0;CxSeg[0]= CxSegData[0];CxSeg[1]= CxSegData[1];CxSeg[2]= CxSegData[2];CxSeg[3]= CxSegData[3];}
}

3、void FreshDisplay(void) 映射显示Ram到主控的IO口

sbit		b_Com1	=	P3^4;			//C_0
sbit		b_Com2	=	P3^5;			//C_1
sbit		b_Com3	=	P3^6;			//C_2
sbit		b_Com4	=	P3^7;			//C_3  COM口定义sbit		b_Seg1	=	P1^4;			//S1
sbit		b_Seg2	=	P1^2;			//S2
sbit		b_Seg3	=	P1^1;			//S3
sbit		b_Seg4	=	P1^0;			//S4
sbit		b_Seg5	=	P0^3;			//S5
sbit		b_Seg6	=	P0^2;			//S6  SEG口定义
//=============================================================================
//函数名称:FreshDisplay
//输	入:无
//输	出:无
//功	能:LED全部刷新显示
//=============================================================================
void FreshDisplay(void)
{static u8 disIndex=0;P3 |=0xf0;									//关闭所有屏幕显示if(disIndex==PwmLevel)	//PwmLevel= 5 100%亮度 =10 1/2亮度   =15 1/3亮度 =20 1/4亮度disIndex=0;								//20分频亮度disIndex++;b_Seg1 = CxSeg[0]&0x01;b_Seg2 = CxSeg[0]&0x02;b_Seg3 = CxSeg[0]&0x04;b_Seg4 = CxSeg[0]&0x08;b_Seg5 = CxSeg[0]&0x10;b_Seg6 = CxSeg[0]&0x20;switch(disIndex){case 1:b_Com1 = 0;			//刷新第一个Com显示break;case 2:b_Com2 = 0;			//刷新第二个Com显示break;case 3:b_Com3 = 0;			//刷新第三个Com显示break;case 4:b_Com4 = 0;			//刷新第四个Com显示break;}
}

4、void LcdDisplay_8bit(void) 映射显示Ram到主控的IO口

#define		b_Red			CxSegData[3]|0x01
#define		b_Inf			CxSegData[3]|0x02
#define		b_Twi			CxSegData[3]|0x04
#define		b_P1    	    CxSegData[2]|0x04
#define		b_P2			CxSegData[2]|0x08
#define		b_P3			CxSegData[2]|0x10
#define		b_P4			CxSegData[2]|0x20		//对应一个点图案显示#define		Unb_Red			CxSegData[3]&~0x01
#define		Unb_Inf			CxSegData[3]&~0x02
#define		Unb_Twi			CxSegData[3]&~0x04
#define		Unb_P1    	    CxSegData[2]&~0x04
#define		Unb_P2			CxSegData[2]&~0x08
#define		Unb_P3			CxSegData[2]&~0x10
#define		Unb_P4			CxSegData[2]&~0x20		//对应一个点图案不显示u8	code	LzLcdNum1[]={COM1,SEG1,			//ACOM1,SEG2,			//BCOM1,SEG3,			//CCOM1,SEG4,			//DCOM1,SEG5,			//ECOM1,SEG6,			//FCOM3,SEG1,			//G0xff,0xff
};u8	code	LzLcdNum2[]={COM2,SEG1,			//ACOM2,SEG2,			//BCOM2,SEG3,			//CCOM2,SEG4,			//DCOM2,SEG5,			//ECOM2,SEG6,			//FCOM3,SEG2,			//G0xff,0xff
};unsigned char code 	LedNumCoding[]={0x3F,                 //0	0	1	1	1	1	1	1    as 0    00x06,                 //0	0	0	0	0	1	1	0    as 1    10x5B,                 //0	1	0	1	1	0	1	1    as 2    20x4F,                 //0	1	0	0	1	1	1	1    as 3    30x66,                 //0	1	1	0	0	1	1	0    as 4    40x6D,                 //0	1	1	0	1	1	0	1    as 5    50x7D,                 //0	1	1	1	1	1	0	1    as 6    60x07,                 //0	0	0	0	0	1	1	1    as 7    70x7F,                 //0	1	1	1	1	1	1	1    as 8    80x6F,                 //0	1	1	0	1	1	1	1    as 9    90x00,                 //0	0	0	0	0	0	0	0    as "全灭"    10		0x40,		      	  //0	1	0	0	0	0	0	0    as "-"    110x76,                 //0	1	1	1	0	1	1	0    as "H"    120x38,                 //0	0	1	1	1	0	0	0    as "L"    130x50,                 //0	1	0	1	0	0	0	0    as "r"    140x39,                 //0	0	1	1	1	0	0	1    as “C”    150x37,                 //0	0	1	1	0	1	1	1    as “n”    160x77,                 //0	1	1	1	0	1	1	1    as “A”    170x71,                 //0	1	1	1	0	0	0	1    as “F”    18										0x7F};                //0	1	1	1	1	1	1	1    as 全显 //=============================================================================
//函数名称:LcdDisplay_8bit
//输	入:无
//输	出:无
//功	能:LED按位显示数据到CxSegData缓存区
//=============================================================================
void LcdDisplay_8bit(u8 *Table_Seg,u8 Value)
{u8 i=0,j=0;u8 Seg,Com;Com=Table_Seg[i];		  Seg=Table_Seg[i+1];i+=2;							  //表的内容为一个seg一个com所以每移一次需要加2for(;Com!=0xff;){if((Value & 0x01)==1)CxSegData[Com]=CxSegData[Com] | Seg;elseCxSegData[Com]=CxSegData[Com] & ~Seg;//CxSegData[Com] &= (Value & 0x01);		//优化if elseValue=Value>>1;Com=Table_Seg[i];Seg=Table_Seg[i+1];i+=2;}
}

三、display.h的外部接口

extern bit	b_Display_Flag;			//更新显示
extern void Display(void);			//各个界面模式显示
extern void BackupRamToDisRam(void);//更新缓冲区数据到映射Ram	
extern void FreshDisplay(void);		//显示Ram映射到硬件IO

四、显示功能的使用、Note

1. 在主函数main的while循环里调用，等标志更新显示

void main(void)
{//_nop_();		//自定义初始化和上电功能
/**************************************************************************************************/while(1){Display();			//显示数据更新BackupRamToDisRam();//更新显示Ram数据if(b_16Hz_Flag){F_16HzTask();		//以频率16Hz进行的任务}if(b_2Hz_Flag){F_2HzTask();		//以频率2Hz进行的任务}}
/***********************************************************************************/		
}

2. 在2~4kHz的定时器里面调用FreshDisplay() 映射到IO功能函数，频率偏低可能观察到有闪烁，可以调节PwmLevel 的大小从而调节亮度，降低功耗；

//=============================================================================
// Function:Time2中断
//=============================================================================
void TIM2_INT(void) interrupt 5  //4kHz 频率
{TF2=0;			//清理中断标志位FreshDisplay();	//刷新LED数字显示

3. 该框架可使用于LCD、数码管、LED显示，可以通过修改映射关系进而移植到其它项目上；
4. 数码管显示难点是如何建立映射关系？如何将IO和显示Ram建立关系？如何控制每个LED的亮灭关系？如何显示数字和字母？
5. 需要更新屏幕显示注意b_Display_Flag是否需要更新缓存区CxSegData的数据，需要更新缓存数据到硬件IO注意b_Fresh_Flag标志；
6. 显示功能基本战项目的50%的代码量，模块化功能程序可以很好定位Bug的位置，缩短开发周期；