7219.c

基于C51的通用人机界面程序

/**************************************************************************
7219.H

7219接口函数
***************************************************************************/
#define _7219_ 
#include "general.h"

//led显示码表,位置码表
//static uchar code code_led_09[10]=	{0x7E,0x30,0x6D,0x79,0x33,0x5B,0x5F,0x70,0x7F,0x7B};
//								0	1	2	3	4		5	6	7	8		9	
#define TABLELEN	30
static struct {uchar asc; uchar cod;}code code_led[TABLELEN] =
 {
 {0x00,0x7e}, {0x01,0x30}, {0x02,0x6d}, {0x03,0x79}, {0x04,0x33},
 {0x05,0x5b}, {0x06,0x5f}, {0x07,0x70}, {0x08,0x7f}, {0x09,0x7b},
 {'A',0x77}, {'S',0x5b}, {'C',0x4e}, {'o',0x1d}, {'E',0x4f},
 {'F',0x47}, {'G',0x5e}, {'O',0x7e}, {'P',0x67}, {'U',0x3e},
 {'r',0x05}, {'T',0x46}, {'.',0x80}, {'-',0x01}, {'=',0x09},
 {'^',0x63}, {'/',0x02}, {'"',0x22}, {' ',0x00}, {0xff,0xff}//度、分、秒、空格、无键
};
	
static uchar code code_led_bit[10]={0x01,0x02,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};
//左高右低
//显示缓冲区
static uchar data buf_disp[10];

//定义MAX7219寄存器
#define nop 		0x00
#define digit0 		0x01
#define digit1 		0x02
#define digit2 		0x03
#define digit3 		0x04
#define digit4 		0x05
#define digit5 		0x06
#define digit6 		0x07
#define digit7 		0x08
#define decodemode 	0x09
#define intensity 	0x0a
#define scanlimit 	0x0b
#define shutdown 	0x0c
#define displaytest 0x0f     

//定义硬件引脚
sbit	clk=P1^2;
sbit	load=P1^1;
sbit	din=P1^0;

/*---------------------------------------
向一个MAX7219写8bit
---------------------------------------
void sendbyte(uchar d)//
{
    char i;
     for(i=8;i>=1;i--)
       {
            din=d&0x80;
            d=d<<1;
            clk=1;
            _nop_();
			_nop_();
			_nop_();
			_nop_();
            clk=0;
         }

}*/
/******************************************************
操作两片7219，送32字节子函数
*******************************************************/
void send32(uchar add1,uchar dat1,uchar add2,uchar dat2)
{ 
	uchar tmp8,i,j;
   	load=0;
   	i=0;
   	while(i<32)
   	{
       if(i<8)		{tmp8=add1;}
       else if(i<16){tmp8=dat1;}
	   else if(i<24){tmp8=add2;}
	   else			{tmp8=dat2;}
       for(j=8;j>=1;j--)
       {
            din=tmp8&0x80;
           tmp8=tmp8<<1;
            clk=1;
            _nop_();
			_nop_();
			_nop_();
			_nop_();
            clk=0;
       }
       i=i+8;
   }
   load=1;
}



/*---------------------------------------
全部熄灭
---------------------------------------*/

void cls(void)
{
	unsigned int i;
 	for(i=0x01;i<=0x08;i+=0x01)
  	send32(i,0x00,i,0x00);
	
}
/******************************************
关闭显示
******************************************
void dispoff()
{
cls();
load=1;
}
/****************************************
缓冲区操作，从pos开始填充n个c
*****************************************
void set_buf_disp(uchar c,uchar pos, uchar n) 
{
   	uchar buf_pos;
	dispoff();
   	for(buf_pos=pos-1; n>0; n--) 
	{
      buf_disp[buf_pos]=c;
      buf_pos++;
      //if(buf_pos>=10) buf_pos=0;
   }
 }
/*----------------------------------------
初始化MAX7219，并清屏
-----------------------------------------*/

void init_max7219(void)
{
/*  send16(decodemode,0x00);    	//设置无解码方式
    send16(intensity,0x0f);        	//设置亮度为max
    send16(scanlimit,0x07);        	//8段全扫描
    send16(shutdown,0x01);        	//设置为正常模式
    send16(displaytest,0x01);		//进行LED测试，全部点亮
    delay(100);
    send16(displaytest,0x00);		//测试完毕
    cls();
*/
	cls();
	send32(decodemode,0x00,decodemode,0x00);    	//设置解码方式:00-无，ff-BCD
	send32(intensity,0x04,intensity,0x0f);        	//设置亮度为max（注意调节两片亮度一致）
	send32(scanlimit,0x01,scanlimit,0x07);        	//高2位，低8位
	send32(shutdown,0x01,shutdown,0x01);        	//设置为正常模式
	send32(displaytest,0x01,displaytest,0x01);		//进行LED测试，全部点亮
    delay(500);
    send32(displaytest,0x00,displaytest,0x00);		//测试完毕
	cls();
	

}
/******************************************
查LED码表
******************************************/
uchar get_seg(uchar c)
{
	uchar i=0;
   	while(code_led[i].asc != c) 
	i++;
   	return(code_led[i].cod);
	//if(i>=TABLELEN)return(0x00);
 }
/*****************************************
将显存写寄存器显示         
****************************************
void dispon()
{
   //uchar dmask=0x01;                               // 显示位控制码
   uchar pos,dat;
   for(pos=0; pos<10; pos++) 
   	{
      	dat=get_seg(buf_disp[pos]); 				// 输出字型 
		if(pos<2){send32((pos+1),dat,nop,nop);}
		else{send32(nop,nop,(pos-1),dat);}
         
    	
      //delay(1);                                    // 延时1ms 
      //dmask=_crol_(dmask,1);                       // 修改位控制码 
   }
 }

 /*********************************************
 在第pos位寄存器写char
 **********************************************/
 void disp(uchar c,uchar pos)
 {
 	uchar dat;
	dat=get_seg(c);
	if(pos<3)	{send32(pos,dat,nop,nop);}
	else		{send32(nop,nop,(pos-2),dat);}

 }
/*******************************************
在第pos位寄存器写char,加小数点，
********************************************/
void disp_dp(uchar c,uchar pos)
{
	uchar dat;
	dat=get_seg(c)+0x80;
	if(pos<3)	{send32(pos,dat,nop,nop);}
	else		{send32(nop,nop,(pos-2),dat);}
}