Hex2BCD再讨论——由自写printf引出的另类Hex2BCD算法
转自大虾网 http://www.daxia.com/list_1683.shtml有一个矛盾总是在困扰我们---那就是计算机喜欢2进制(16进制)而人类已经习惯了10进制
传统的HEX--BCD通常都按二进制定义按权展开,再付以10进制调整来实现,速度太慢,效率低
我的思路是这样的2的12次方=4096=4100-4=1000H及每一个1000H可以看着"4100"如果有误
差可以从余数中扣除,如双字节数最多扣除16*4=64个,如果有余数,够扣就扣,不够扣从4100
个中次高位减一当100已经够了!如果你问16是怎么来得我告诉65536/4096=16下面是程序
DPTR中是待转换的双字节16进制数,转换的数据保存在34H33H32H31H30H五个连续单元中34H
为高,同样的道理把100=60H+4 4096/96最多商42 4*42=168
16=4096/256 64和128因为都是单字节所以运算非常简单,经过仿真对比其运行速度比传统
方式快12倍!!!!!!!
HEXBCD:MOV A,DPH ;16进制高位送A
ANL A,#0F0H;屏蔽A低四位
XRL DPH,A ;屏蔽DPH高四位
SWAP A ;A除以16 ( 注意这技巧)
MOV 32H,A ;把A个100放百位单元
RL A
RL A ;两次RL A相当于乘以4,这个4表示4A个千,也表示要扣除4A
;A*4096=A*(4000+100)-4A=4A*1000+A*100-4A
XCH A,DPL
SUBB A,DPL
XCH A,DPH
SUBB A,#00H;以上四条指令完成4A的扣除,结果高位在A,低位在DPH
JNC "够扣"
DEC 32H ;不够扣32H减一当百
MOV A,#101 ;本来是100这里用101是考虑C=1这样就节省一条指令CLR C
SUBB A,DPL
ADD A,DPH;A肯定小于64为什么?所以高位不计算了!
MOV B,#10
DIV AB
MOV 31H,A
MOV 30H,B
这是个简易的printf，一次只能带一个参数，printf代码在下面。
============================================================
这里是main.c
============================================================
#define _X
#include<myprintf.c> //mypr换成printf时，将此项注释掉
//mypr换成printf时，包含下面三项
//#include<regx52.h> //mypr换成printf时，包外含这三项，将上面一项注释掉
//#include<inituart.c>
//#include<stdio.h>
main()
{
unsigned int k=0x1234;
InitUart();
while(1)
{
mypr("Hello World!\r\n K is %x",k);//定义_U时%x换成%u,用printf时用%u和%x各一次
}
}
void uart(void) interrupt 4 using 0
{
}
#define _XProgram Size: data=15.0 xdata=0 code=256
#define _UProgram Size: data=27.0 xdata=0 code=716
printf ...一样
%x Program Size: data=32.1 xdata=0 code=1131
%u Program Size: data=32.1 xdata=0 code=1131
============================================================
下面是myprintf.c
============================================================
#include<regx52.h>
#ifndef BaudRate
#define BaudRate 57600L
#endif
#ifndef OSC
#define OSC 22118400L //11.0592M
#endif
#include<inituarts.c>
#ifndef _X
#ifndef _U
#define _X
#define _U
#endif
#endif
unsigned char code hex2ascii[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,0x45,0x46};
//putchar
void prc(unsigned char c)
{
while(!TI)
;
TI=0;
SBUF=c;
}
//xu=1 或2 说明包含输出％u功能
#ifdef _U
void Hex2BCD(unsigned char *p,unsigned int t)
{
unsigned char i=0;
unsigned char s;
if(t<10000) goto ca0;
if(t>=40000) {i =4;t-=40000;} //如果t<=9999,则这部分可不用。
if(t>=20000) {i+=2;t-=20000;}
if(t>=10000) {i++; t-=10000;}
*p++=i+48; //LCDascii
i=0;
ca0:
if(t>=8000) {i =8;t-=8000;goto ca1;}
else
if(t>=4000) {i=4;t-=4000;}
else ;
if(t>=2000) {i+=2;t-=2000;}
ca1:
if(t>=1000) {i++; t-=1000;}
*p++=i+48;
i=0;
if(t>=800) {i =8;t-=800;goto cb1;}
else
if(t>=400) {i=4;t-=400;}
else ;
if(t>=200) {i+=2;t-=200;}
cb1:
s=(unsigned char)t;
if(s>=100) {i++; s-=100;}
*p++=i+48;
i=0;
if(s>=80) {i=8;s-=80;goto cc1;}
else
if(s>=40) {i=4;s-=40;}
else ;
if(s>=20) {i+=2;s-=20;}
cc1:
if(s>=10) {i++; s-=10;}
*p++=i+48;
*p++=s+48;
*p='\0';
}
#endif
//miniprintf
void mypr(unsigned char code *p,unsigned int ap)
{
unsigned char* apbufp;
#ifdef _U
unsigned char apbuf;
#endif
for( ;(*p) != '\0';++p)
{
if(*p!='%')
{
prc(*p);
continue;
}
p++;
#ifdef _X
if(*p=='x')
{
prc('0');
prc('x');
apbufp=(unsigned char *)(&ap); //指向ap的高位，简化除法。（只用高位）
while(ap)
{
if(ap&0xf000) //说明ap>0x1000
prc(hex2ascii[(unsigned char)(*apbufp>>4)]); //提取高位，然后除8 ,如0x1234提出0x12,0x12>>4=0x01
else
prc('0');
ap<<=4; //向高位移4位，0x1234变成0x2340变成0x3400变成0x4000变成0x0000
}
}
continue;
#endif
#ifdef _U
if(*p=='u')
{
Hex2BCD(apbuf,ap); //变成BCD数组
apbufp=apbuf;
while(*apbufp)
{
prc(*apbufp);
apbufp++;
}
}
#endif
continue;
}
} 变参数，myprintf２.c
#define _X
#include<myprintf2.c> //mypr换成printf时，将此项注释掉
//mypr换成printf时，包含下面三项
//#include<regx52.h> //mypr换成printf时，包外含这三项，将上面一项注释掉
//#include<inituart.c>
//#include<stdio.h>
main()
{
unsigned int k=0x1234;
InitUart();
while(1)
{
mypr("\r\n K is %x, K is %u",k,k);//定义_U时%x换成%u,用printf时用%u和%x各一次
}
}
void uart(void) interrupt 4 using 0
{
}
#define _X%x%x Program Size: data=31.0 xdata=0 code=369
#define _U%u%u Program Size: data=45.0 xdata=0 code=835
#define _XU %x%u Program Size: data=48.0 xdata=0 code=922
printf ...一样
%x%x Program Size: data=32.1 xdata=0 code=1146
%u%u Program Size: data=32.1 xdata=0 code=1146
%x%u Program Size: data=32.1 xdata=0 code=1146
看来是在Hex2BCD上花了太多资源。高手来指点。！
==================================================================
下面是myprintf2.c inituarts.c在最本贴最下面。
==================================================================
#include<regx52.h>
#include <stdarg.h>
#ifndef BaudRate
#define BaudRate 57600L
#endif
#ifndef OSC
#define OSC 22118400L //11.0592M
#endif
#include<inituarts.c>
//#define _XU
#ifndef _X
#ifndef _U
#define _X
#define _U
#endif
#endif
unsigned char code hex2ascii[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,0x45,0x46};
//putchar
void prc(unsigned char c)
{
while(!TI)
;
TI=0;
SBUF=c;
}
#ifdef _U
void Hex2BCD(unsigned char *fmt,unsigned int t)
{
unsigned char i=0;
unsigned char s;
if(t<10000) goto ca0;
if(t>=40000) {i =4;t-=40000;} //如果t<=9999,则这部分可不用。
if(t>=20000) {i+=2;t-=20000;}
if(t>=10000) {i++; t-=10000;}
*fmt++=i+48; //LCDascii
i=0;
ca0:
if(t>=8000) {i =8;t-=8000;goto ca1;}
else
if(t>=4000) {i=4;t-=4000;}
else ;
if(t>=2000) {i+=2;t-=2000;}
ca1:
if(t>=1000) {i++; t-=1000;}
*fmt++=i+48;
i=0;
if(t>=800) {i =8;t-=800;goto cb1;}
else
if(t>=400) {i=4;t-=400;}
else ;
if(t>=200) {i+=2;t-=200;}
cb1:
s=(unsigned char)t;
if(s>=100) {i++; s-=100;}
*fmt++=i+48;
i=0;
if(s>=80) {i=8;s-=80;goto cc1;}
else
if(s>=40) {i=4;s-=40;}
else ;
if(s>=20) {i+=2;s-=20;}
cc1:
if(s>=10) {i++; s-=10;}
*fmt++=i+48;
*fmt++=s+48;
*fmt='\0';
}
#endif
//miniprintf
void mypr(unsigned char code *fmt,...)
{
unsigned char * apbufp;
#ifdef _U
unsigned char apbuf;
#endif
va_list pp;
va_start(pp,fmt); /* 用最后一个具有参数的类型的参数去初始化ap */
for( ;(*fmt) != '\0';++fmt)
{
if(*fmt!='%')
{
prc(*fmt);
continue;
}
fmt++;
if(*fmt=='%')
{
prc('%');
continue;
}
if(*fmt=='\0') //错误，格式符不完整
{
prc(16); //输出一个小方框...表示错误
return ;}
{
unsigned int ap =va_arg(pp,unsigned int);//作用范围｛｝内
if(*fmt=='x')
{
#ifdef _X
prc('0');
prc('x');
apbufp=(unsigned char *)(&ap); //指向ap的高位，简化除法。（只用高位）
while(ap)
{
if(ap&0xf000) //说明ap>0x1000
prc(hex2ascii[(unsigned char)(*apbufp>>4)]);//提取高位，然后除8 ,如0x1234提出0x12,0x12>>4=0x01
else
prc('0');
ap<<=4; //向高位移4位，0x1234变成0x2340变成0x3400变成0x4000变成0x0000
}
#else
goto error;
#endif
continue;
}
if(*fmt=='u')
{
#ifdef _U
Hex2BCD(apbuf,ap); //变成BCD数组
apbufp=apbuf;
while(*apbufp)
{
prc(*apbufp);
apbufp++;
}
#else
goto error;
#endif
continue;
}
}
#ifndef _XU
error:
prc(15); //定义时未包含此格式，例如定义了_U,却用了%x
continue;
#endif
}
}
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
下面是inituarts.c
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
//22.1184M Hz 晶振
//#define BaudRate 57600L //波特率
//#define OSC 22118400L //晶振频率//22.1184M
#ifndef BaudRate //波特率
#error BaudRate undefined! Now BaudRate is Defaut(115200)!
#define BaudRate 115200L //晶振频率
#endif
#ifndef OSC
#error OSC undefined! Now OSC is Defaut(11059200)!
#define OSC 11059200L //11.0592M
#endif
#define TimerInitNum (256 - (OSC/192L)/BaudRate) // 255 //定时器１初值
//定时器1为波特率发生器
#if (BaudRate==2400)||(BaudRate==4800)||(BaudRate==9600)||(BaudRate==14400)||(BaudRate==19200)||(BaudRate==28800)||(BaudRate==38400)||(BaudRate==57600)||(BaudRate==115200)
void InitUart(void)
{
SCON=0x50; //串口方式1，允许接收
TMOD=0x20; //定时器1定时方式2
PCON=0x80; //设定SMOD为1
TH1=TimerInitNum; //0xfe 22.1184M-57600bps
TL1=TimerInitNum;
TR1=1; //启动定时器 //设定时器1开始计数
ET1=1;TI=1;
EA=1;
ES=1;
}
#else
#error "BaudRate" defination do not match,must be one of (19200,57600,115200)!
#endif 你的hex2bcd太臃肿了
用keil自带的库，反汇编回来看看 下面就是printf了
printf("Hello World!\r\n K is %x, K is %u",k,k);
C:0x0450 1187 ACALL PRINTF(C:0087)
C:0x0087 E4 CLR A
C:0x0088 C207 CLR 0x20.7
C:0x008A F519 MOV 0x19,A
C:0x008C 8B0A MOV ?_PRINTF517?BYTE(0x0A),R3
C:0x008E 8A0B MOV 0x0B,R2
C:0x0090 890C MOV 0x0C,R1
C:0x0092 E4 CLR A
C:0x0093 F51A MOV 0x1A,A
C:0x0095 F51C MOV 0x1C,A
C:0x0097 F51D MOV 0x1D,A
C:0x0099 E51A MOV A,0x1A
C:0x009B 6007 JZ C:00A4
C:0x009D 7F20 MOV R7,#0x20
C:0x009F 120060 LCALL C:0060
C:0x00A2 80F5 SJMP C:0099
C:0x00A4 751BFF MOV 0x1B,#0xFF
C:0x00A7 C201 CLR 0x20.1
C:0x00A9 C200 CLR 0x20.0
C:0x00AB C202 CLR 0x20.2
C:0x00AD C203 CLR 0x20.3
C:0x00AF C205 CLR 0x20.5
C:0x00B1 C206 CLR 0x20.6
C:0x00B3 C208 CLR 0x21.0
C:0x00B5 12002E LCALL C:002E
C:0x00B8 FF MOV R7,A
C:0x00B9 700D JNZ C:00C8
C:0x00BB 300705 JNB 0x20.7,C:00C3
C:0x00BE 7F00 MOV R7,#0x00
C:0x00C0 120071 LCALL C:0071
C:0x00C3 AF1D MOV R7,0x1D
C:0x00C5 AE1C MOV R6,0x1C
C:0x00C7 22 RET
C:0x00C8 B4255F CJNE A,#0x25,C:012A
C:0x00CB C2D5 CLR F0(0xD0.5)
C:0x00CD C204 CLR 0x20.4
C:0x00CF 12002E LCALL C:002E
C:0x00D2 FF MOV R7,A
C:0x00D3 24D0 ADD A,#PSW(0xD0)
C:0x00D5 B40A00 CJNE A,#?_PRINTF517?BYTE(0x0A),C:00D8
C:0x00D8 501A JNC C:00F4
C:0x00DA 75F00A MOV B(0xF0),#?_PRINTF517?BYTE(0x0A)
C:0x00DD 781A MOV R0,#0x1A
C:0x00DF 30D505 JNB F0(0xD0.5),C:00E7
C:0x00E2 08 INC R0
C:0x00E3 B6FF01 CJNE @R0,#0xFF,C:00E7
C:0x00E6 06 INC @R0
C:0x00E7 C6 XCH A,@R0
C:0x00E8 A4 MUL AB
C:0x00E9 26 ADD A,@R0
C:0x00EA F6 MOV @R0,A
C:0x00EB 20D504 JB F0(0xD0.5),C:00F2
C:0x00EE 7002 JNZ C:00F2
C:0x00F0 D203 SETB 0x20.3
C:0x00F2 80D9 SJMP C:00CD
C:0x00F4 24CF ADD A,#0xCF
C:0x00F6 B41A00 CJNE A,#0x1A,C:00F9
C:0x00F9 EF MOV A,R7
C:0x00FA 5004 JNC C:0100
C:0x00FC C2E5 CLR 0xE0.5
C:0x00FE D204 SETB 0x20.4
C:0x0100 020271 LJMP C:0271
C:0x0103 D201 SETB 0x20.1
C:0x0105 80C6 SJMP C:00CD
C:0x0107 D200 SETB 0x20.0
C:0x0109 80C0 SJMP C:00CB
C:0x010B D202 SETB 0x20.2
C:0x010D 80BC SJMP C:00CB
C:0x010F D2D5 SETB F0(0xD0.5)
C:0x0111 80BA SJMP C:00CD
C:0x0113 D205 SETB 0x20.5
C:0x0115 80B4 SJMP C:00CB
C:0x0117 7F20 MOV R7,#0x20
C:0x0119 120060 LCALL C:0060
C:0x011C 200207 JB 0x20.2,C:0126
C:0x011F 7401 MOV A,#0x01
C:0x0121 B51A00 CJNE A,0x1A,C:0124
C:0x0124 40F1 JC C:0117
C:0x0126 120025 LCALL C:0025
C:0x0129 FF MOV R7,A
C:0x012A 120060 LCALL C:0060
C:0x012D 020099 LJMP C:0099
C:0x0130 D208 SETB 0x21.0
C:0x0132 D206 SETB 0x20.6
C:0x0134 8095 SJMP C:00CB
C:0x0136 120025 LCALL C:0025
C:0x0139 FB MOV R3,A
C:0x013A 120025 LCALL C:0025
C:0x013D FA MOV R2,A
C:0x013E 120025 LCALL C:0025
C:0x0141 F9 MOV R1,A
C:0x0142 4A ORL A,R2
C:0x0143 4B ORL A,R3
C:0x0144 7006 JNZ C:014C
C:0x0146 7942 MOV R1,#0x42
C:0x0148 7A03 MOV R2,#0x03
C:0x014A 7BFF MOV R3,#0xFF
C:0x014C 20022E JB 0x20.2,C:017D
C:0x014F E51A MOV A,0x1A
C:0x0151 602A JZ C:017D
C:0x0153 7E00 MOV R6,#0x00
C:0x0155 8E82 MOV DPL(0x82),R6
C:0x0157 758300 MOV DPH(0x83),#0x00
C:0x015A 12039A LCALL C?CLDOPTR(C:039A)
C:0x015D 6006 JZ C:0165
C:0x015F 0E INC R6
C:0x0160 EE MOV A,R6
C:0x0161 651B XRL A,0x1B
C:0x0163 70F0 JNZ C:0155
C:0x0165 C2D5 CLR F0(0xD0.5)
C:0x0167 EB MOV A,R3
C:0x0168 C0E0 PUSH ACC(0xE0)
C:0x016A EA MOV A,R2
C:0x016B C0E0 PUSH ACC(0xE0)
C:0x016D E9 MOV A,R1
C:0x016E C0E0 PUSH ACC(0xE0)
C:0x0170 EE MOV A,R6
C:0x0171 1202B8 LCALL C:02B8
C:0x0174 D0E0 POP ACC(0xE0)
C:0x0176 F9 MOV R1,A
C:0x0177 D0E0 POP ACC(0xE0)
C:0x0179 FA MOV R2,A
C:0x017A D0E0 POP ACC(0xE0)
C:0x017C FB MOV R3,A
C:0x017D 120381 LCALL C?CLDPTR(C:0381)
C:0x0180 FF MOV R7,A
C:0x0181 60AA JZ C:012D
C:0x0183 EB MOV A,R3
C:0x0184 C0E0 PUSH ACC(0xE0)
C:0x0186 EA MOV A,R2
C:0x0187 C0E0 PUSH ACC(0xE0)
C:0x0189 E9 MOV A,R1
C:0x018A C0E0 PUSH ACC(0xE0)
C:0x018C 120060 LCALL C:0060
C:0x018F D0E0 POP ACC(0xE0)
C:0x0191 2401 ADD A,#0x01
C:0x0193 F9 MOV R1,A
C:0x0194 D0E0 POP ACC(0xE0)
C:0x0196 3400 ADDC A,#0x00
C:0x0198 FA MOV R2,A
C:0x0199 D0E0 POP ACC(0xE0)
C:0x019B FB MOV R3,A
C:0x019C E51B MOV A,0x1B
C:0x019E 04 INC A
C:0x019F 60DC JZ C:017D
C:0x01A1 D51BD9 DJNZ 0x1B,C:017D
C:0x01A4 8087 SJMP C:012D
C:0x01A6 7BFF MOV R3,#0xFF
C:0x01A8 7A02 MOV R2,#0x02
C:0x01AA 79B4 MOV R1,#0xB4
C:0x01AC D202 SETB 0x20.2
C:0x01AE 809C SJMP C:014C
C:0x01B0 7910 MOV R1,#0x10
C:0x01B2 8002 SJMP C:01B6
C:0x01B4 7908 MOV R1,#0x08
C:0x01B6 C206 CLR 0x20.6
C:0x01B8 C208 CLR 0x21.0
C:0x01BA 8008 SJMP C:01C4
C:0x01BC D2D5 SETB F0(0xD0.5)
C:0x01BE 790A MOV R1,#?_PRINTF517?BYTE(0x0A)
C:0x01C0 8004 SJMP C:01C6
C:0x01C2 790A MOV R1,#?_PRINTF517?BYTE(0x0A)
C:0x01C4 C2D5 CLR F0(0xD0.5)
C:0x01C6 E51B MOV A,0x1B
C:0x01C8 04 INC A
C:0x01C9 7002 JNZ C:01CD
C:0x01CB F51B MOV 0x1B,A
C:0x01CD E4 CLR A
C:0x01CE FA MOV R2,A
C:0x01CF FD MOV R5,A
C:0x01D0 FE MOV R6,A
C:0x01D1 FF MOV R7,A
C:0x01D2 120025 LCALL C:0025
C:0x01D5 FC MOV R4,A
C:0x01D6 7B08 MOV R3,#0x08
C:0x01D8 200113 JB 0x20.1,C:01EE
C:0x01DB 120025 LCALL C:0025
C:0x01DE FD MOV R5,A
C:0x01DF 7B10 MOV R3,#0x10
C:0x01E1 30000A JNB 0x20.0,C:01EE
C:0x01E4 120025 LCALL C:0025
C:0x01E7 FE MOV R6,A
C:0x01E8 120025 LCALL C:0025
C:0x01EB FF MOV R7,A
C:0x01EC 7B20 MOV R3,#0x20
C:0x01EE EC MOV A,R4
C:0x01EF 33 RLC A
C:0x01F0 82D5 ANL C,F0(0xD0.5)
C:0x01F2 92D5 MOV F0(0xD0.5),C
C:0x01F4 5013 JNC C:0209
C:0x01F6 C3 CLR C
C:0x01F7 E4 CLR A
C:0x01F8 300006 JNB 0x20.0,C:0201
C:0x01FB 9F SUBB A,R7
C:0x01FC FF MOV R7,A
C:0x01FD E4 CLR A
C:0x01FE 9E SUBB A,R6
C:0x01FF FE MOV R6,A
C:0x0200 E4 CLR A
C:0x0201 200103 JB 0x20.1,C:0207
C:0x0204 9D SUBB A,R5
C:0x0205 FD MOV R5,A
C:0x0206 E4 CLR A
C:0x0207 9C SUBB A,R4
C:0x0208 FC MOV R4,A
C:0x0209 E4 CLR A
C:0x020A CB XCH A,R3
C:0x020B F8 MOV R0,A
C:0x020C C201 CLR 0x20.1
C:0x020E EC MOV A,R4
C:0x020F 700C JNZ C:021D
C:0x0211 CF XCH A,R7
C:0x0212 CE XCH A,R6
C:0x0213 CD XCH A,R5
C:0x0214 CC XCH A,R4
C:0x0215 E8 MOV A,R0
C:0x0216 24F8 ADD A,#0xF8
C:0x0218 F8 MOV R0,A
C:0x0219 70F3 JNZ C:020E
C:0x021B 8017 SJMP C:0234
C:0x021D C3 CLR C
C:0x021E EF MOV A,R7
C:0x021F 33 RLC A
C:0x0220 FF MOV R7,A
C:0x0221 EE MOV A,R6
C:0x0222 33 RLC A
C:0x0223 FE MOV R6,A
C:0x0224 ED MOV A,R5
C:0x0225 33 RLC A
C:0x0226 FD MOV R5,A
C:0x0227 EC MOV A,R4
C:0x0228 33 RLC A
C:0x0229 FC MOV R4,A
C:0x022A EB MOV A,R3
C:0x022B 33 RLC A
C:0x022C FB MOV R3,A
C:0x022D 99 SUBB A,R1
C:0x022E 4002 JC C:0232
C:0x0230 FB MOV R3,A
C:0x0231 0F INC R7
C:0x0232 D8E9 DJNZ R0,C:021D
C:0x0234 EB MOV A,R3
C:0x0235 300105 JNB 0x20.1,C:023D
C:0x0238 F8 MOV R0,A
C:0x0239 D0E0 POP ACC(0xE0)
C:0x023B C4 SWAP A
C:0x023C 48 ORL A,R0
C:0x023D B201 CPL 0x20.1
C:0x023F C0E0 PUSH ACC(0xE0)
C:0x0241 0A INC R2
C:0x0242 EC MOV A,R4
C:0x0243 4D ORL A,R5
C:0x0244 4E ORL A,R6
C:0x0245 4F ORL A,R7
C:0x0246 7820 MOV R0,#0x20
C:0x0248 7B00 MOV R3,#0x00
C:0x024A 70C2 JNZ C:020E
C:0x024C EA MOV A,R2
C:0x024D B51B00 CJNE A,0x1B,C:0250
C:0x0250 40BC JC C:020E
C:0x0252 C0E0 PUSH ACC(0xE0)
C:0x0254 1202BA LCALL C:02BA
C:0x0257 D0F0 POP B(0xF0)
C:0x0259 D0E0 POP ACC(0xE0)
C:0x025B 200104 JB 0x20.1,C:0262
C:0x025E C4 SWAP A
C:0x025F C0E0 PUSH ACC(0xE0)
C:0x0261 C4 SWAP A
C:0x0262 B201 CPL 0x20.1
C:0x0264 C0F0 PUSH B(0xF0)
C:0x0266 120049 LCALL C:0049
C:0x0269 D0F0 POP B(0xF0)
C:0x026B D5F0EB DJNZ B(0xF0),C:0259
C:0x026E 020099 LJMP C:0099
C:0x0271 1203E9 LCALL C?CCASE(C:03E9)
C:0x0274 0136 AJMP C:0036
C:0x0276 5301B0 ANL 0x01,#P3(0xB0)
C:0x0279 58 ANL A,R0
C:0x027A 0107 AJMP C:0007
C:0x027C 4C ORL A,R4
C:0x027D 0103 AJMP C:0003
C:0x027F 4201 ORL 0x01,A
C:0x0281 B44F01 CJNE A,#0x4F,C:0285
C:0x0284 BC4401 CJNE R4,#0x44,C:0288
C:0x0287 BC4901 CJNE R4,#0x49,C:028B
C:0x028A 1C DEC R4
C:0x028B 4301C2 ORL 0x01,#0xC2
C:0x028E 5501 ANL A,0x01
C:0x0290 A646 MOV @R0,0x46
C:0x0292 01A6 AJMP C:00A6
C:0x0294 4501 ORL A,0x01
C:0x0296 A647 MOV @R0,0x47
C:0x0298 03 RR A
C:0x0299 6250 XRL 0x50,A
C:0x029B 010B AJMP C:000B
C:0x029D 2D ADD A,R5
C:0x029E 010F AJMP C:000F
C:0x02A0 2E ADD A,R6
C:0x02A1 0132 AJMP C:0032
C:0x02A3 2B ADD A,R3
C:0x02A4 0113 AJMP C:0013
C:0x02A6 23 RL A
C:0x02A7 0130 AJMP C:0030
C:0x02A9 20034B JB 0x20.3,C:02F7
C:0x02AC 2A ADD A,R2
C:0x02AD 00 NOP
C:0x02AE CB XCH A,R3
C:0x02AF 48 ORL A,R0
C:0x02B0 00 NOP
C:0x02B1 00 NOP
C:0x02B2 012A AJMP C:002A
C:0x02B4 3F ADDC A,R7
C:0x02B5 3F ADDC A,R7
C:0x02B6 3F ADDC A,R7
C:0x02B7 00 NOP
C:0x02B8 790A MOV R1,#?_PRINTF517?BYTE(0x0A)
C:0x02BA A2D5 MOV C,F0(0xD0.5)
C:0x02BC 200314 JB 0x20.3,C:02D3
C:0x02BF 300509 JNB 0x20.5,C:02CB
C:0x02C2 B91002 CJNE R1,#0x10,C:02C7
C:0x02C5 04 INC A
C:0x02C6 04 INC A
C:0x02C7 B90801 CJNE R1,#0x08,C:02CB
C:0x02CA 04 INC A
C:0x02CB A2D5 MOV C,F0(0xD0.5)
C:0x02CD 200602 JB 0x20.6,C:02D2
C:0x02D0 5001 JNC C:02D3
C:0x02D2 04 INC A
C:0x02D3 200268 JB 0x20.2,C:033E
C:0x02D6 9202 MOV 0x20.2,C
C:0x02D8 B51A00 CJNE A,0x1A,C:02DB
C:0x02DB 5034 JNC C:0311
C:0x02DD C0E0 PUSH ACC(0xE0)
C:0x02DF 7F20 MOV R7,#0x20
C:0x02E1 300319 JNB 0x20.3,C:02FD
C:0x02E4 7F30 MOV R7,#0x30
C:0x02E6 A202 MOV C,0x20.2
C:0x02E8 7206 ORL C,0x20.6
C:0x02EA 7205 ORL C,0x20.5
C:0x02EC 500F JNC C:02FD
C:0x02EE 120311 LCALL C:0311
C:0x02F1 C202 CLR 0x20.2
C:0x02F3 C206 CLR 0x20.6
C:0x02F5 C205 CLR 0x20.5
C:0x02F7 C208 CLR 0x21.0
C:0x02F9 7F30 MOV R7,#0x30
C:0x02FB 800F SJMP C:030C
C:0x02FD 300503 JNB 0x20.5,C:0303
C:0x0300 E9 MOV A,R1
C:0x0301 C0E0 PUSH ACC(0xE0)
C:0x0303 120060 LCALL C:0060
C:0x0306 300503 JNB 0x20.5,C:030C
C:0x0309 D0E0 POP ACC(0xE0)
C:0x030B F9 MOV R1,A
C:0x030C D0E0 POP ACC(0xE0)
C:0x030E B51ACC CJNE A,0x1A,C:02DD
C:0x0311 300517 JNB 0x20.5,C:032B
C:0x0314 7F30 MOV R7,#0x30
C:0x0316 B9100C CJNE R1,#0x10,C:0325
C:0x0319 120060 LCALL C:0060
C:0x031C 7F58 MOV R7,#0x58
C:0x031E 300407 JNB 0x20.4,C:0328
C:0x0321 7F78 MOV R7,#0x78
C:0x0323 8003 SJMP C:0328
C:0x0325 B90803 CJNE R1,#0x08,C:032B
C:0x0328 120060 LCALL C:0060
C:0x032B 300205 JNB 0x20.2,C:0333
C:0x032E 7F2D MOV R7,#0x2D
C:0x0330 020060 LJMP C:0060
C:0x0333 7F20 MOV R7,#0x20
C:0x0335 2008F8 JB 0x21.0,C:0330
C:0x0338 7F2B MOV R7,#0x2B
C:0x033A 2006F3 JB 0x20.6,C:0330
C:0x033D 22 RET
C:0x033E 9202 MOV 0x20.2,C
C:0x0340 80CF SJMP C:0311
C:0x0342 28 ADD A,R0
C:0x0343 6E XRL A,R6
C:0x0344 756C6C MOV 0x6C,#0x6C
C:0x0347 29 ADD A,R1
C:0x0348 00 NOP
C:0x0349 D201 SETB 0x20.1
C:0x034B 120025 LCALL C:0025
C:0x034E 3001F8 JNB 0x20.1,C:0349
C:0x0351 C201 CLR 0x20.1
C:0x0353 781A MOV R0,#0x1A
C:0x0355 30D501 JNB F0(0xD0.5),C:0359
C:0x0358 08 INC R0
C:0x0359 F6 MOV @R0,A
C:0x035A 0200CB LJMP C:00CB
C:0x035D 2D ADD A,R5
C:0x035E 5043 JNC C:03A3
C:0x0360 49 ORL A,R1
C:0x0361 58 ANL A,R0
C:0x0362 120025 LCALL C:0025
C:0x0365 2403 ADD A,#0x03
C:0x0367 B40500 CJNE A,#0x05,C:036A
C:0x036A 4001 JC C:036D
C:0x036C E4 CLR A
C:0x036D 90035D MOV DPTR,#0x035D
C:0x0370 93 MOVC A,@A+DPTR
C:0x0371 120051 LCALL C:0051
C:0x0374 743A MOV A,#0x3A
C:0x0376 120051 LCALL C:0051
C:0x0379 D203 SETB 0x20.3
C:0x037B 751A04 MOV 0x1A,#0x04
C:0x037E 0201B0 LJMP C:01B0
C:0x0381 BB0106 CJNE R3,#0x01,C:038A
C:0x0384 8982 MOV DPL(0x82),R1
C:0x0386 8A83 MOV DPH(0x83),R2
C:0x0388 E0 MOVX A,@DPTR
C:0x0389 22 RET
C:0x038A 5002 JNC C:038E
C:0x038C E7 MOV A,@R1
C:0x038D 22 RET
C:0x038E BBFE02 CJNE R3,#0xFE,C:0393
C:0x0391 E3 MOVX A,@R1
C:0x0392 22 RET
C:0x0393 8982 MOV DPL(0x82),R1
C:0x0395 8A83 MOV DPH(0x83),R2
C:0x0397 E4 CLR A
C:0x0398 93 MOVC A,@A+DPTR
C:0x0399 22 RET
C:0x039A BB010C CJNE R3,#0x01,C:03A9
C:0x039D E582 MOV A,DPL(0x82)
C:0x039F 29 ADD A,R1
C:0x03A0 F582 MOV DPL(0x82),A
C:0x03A2 E583 MOV A,DPH(0x83)
C:0x03A4 3A ADDC A,R2
C:0x03A5 F583 MOV DPH(0x83),A
C:0x03A7 E0 MOVX A,@DPTR
C:0x03A8 22 RET
C:0x03A9 5006 JNC C:03B1
C:0x03AB E9 MOV A,R1
C:0x03AC 2582 ADD A,DPL(0x82)
C:0x03AE F8 MOV R0,A
C:0x03AF E6 MOV A,@R0
C:0x03B0 22 RET
C:0x03B1 BBFE06 CJNE R3,#0xFE,C:03BA
C:0x03B4 E9 MOV A,R1
C:0x03B5 2582 ADD A,DPL(0x82)
C:0x03B7 F8 MOV R0,A
C:0x03B8 E2 MOVX A,@R0
C:0x03B9 22 RET
C:0x03BA E582 MOV A,DPL(0x82)
C:0x03BC 29 ADD A,R1
C:0x03BD F582 MOV DPL(0x82),A
C:0x03BF E583 MOV A,DPH(0x83)
C:0x03C1 3A ADDC A,R2
C:0x03C2 F583 MOV DPH(0x83),A
C:0x03C4 E4 CLR A
C:0x03C5 93 MOVC A,@A+DPTR
C:0x03C6 22 RET
C:0x03C7 BB0106 CJNE R3,#0x01,C:03D0
C:0x03CA 8982 MOV DPL(0x82),R1
C:0x03CC 8A83 MOV DPH(0x83),R2
C:0x03CE F0 MOVX @DPTR,A
C:0x03CF 22 RET
C:0x03D0 5002 JNC C:03D4
C:0x03D2 F7 MOV @R1,A
C:0x03D3 22 RET
C:0x03D4 BBFE01 CJNE R3,#0xFE,C:03D8
C:0x03D7 F3 MOVX @R1,A
C:0x03D8 22 RET
C:0x03D9 FA MOV R2,A
C:0x03DA E6 MOV A,@R0
C:0x03DB FB MOV R3,A
C:0x03DC 08 INC R0
C:0x03DD 08 INC R0
C:0x03DE E6 MOV A,@R0
C:0x03DF F9 MOV R1,A
C:0x03E0 25F0 ADD A,B(0xF0)
C:0x03E2 F6 MOV @R0,A
C:0x03E3 18 DEC R0
C:0x03E4 E6 MOV A,@R0
C:0x03E5 CA XCH A,R2
C:0x03E6 3A ADDC A,R2
C:0x03E7 F6 MOV @R0,A
C:0x03E8 22 RET
C:0x03E9 D083 POP DPH(0x83)
C:0x03EB D082 POP DPL(0x82)
C:0x03ED F8 MOV R0,A
C:0x03EE E4 CLR A
C:0x03EF 93 MOVC A,@A+DPTR
C:0x03F0 7012 JNZ C:0404
C:0x03F2 7401 MOV A,#0x01
C:0x03F4 93 MOVC A,@A+DPTR
C:0x03F5 700D JNZ C:0404
C:0x03F7 A3 INC DPTR
C:0x03F8 A3 INC DPTR
C:0x03F9 93 MOVC A,@A+DPTR
C:0x03FA F8 MOV R0,A
C:0x03FB 7401 MOV A,#0x01
C:0x03FD 93 MOVC A,@A+DPTR
C:0x03FE F582 MOV DPL(0x82),A
C:0x0400 8883 MOV DPH(0x83),R0
C:0x0402 E4 CLR A
C:0x0403 73 JMP @A+DPTR
C:0x0404 7402 MOV A,#0x02
C:0x0406 93 MOVC A,@A+DPTR
C:0x0407 68 XRL A,R0
C:0x0408 60EF JZ C:03F9
C:0x040A A3 INC DPTR
C:0x040B A3 INC DPTR
C:0x040C A3 INC DPTR
C:0x040D 80DF SJMP C:03EE
C:0x040F EF MOV A,R7
C:0x0410 B40A07 CJNE A,#?_PRINTF517?BYTE(0x0A),C:041A
C:0x0413 740D MOV A,#0x0D
C:0x0415 12041A LCALL C:041A
C:0x0418 740A MOV A,#?_PRINTF517?BYTE(0x0A)
C:0x041A 309811 JNB RI(0x98.0),C:042E
C:0x041D A899 MOV R0,SBUF(0x99)
C:0x041F B8130C CJNE R0,#0x13,C:042E
C:0x0422 C298 CLR RI(0x98.0)
C:0x0424 3098FD JNB RI(0x98.0),C:0424
C:0x0427 A899 MOV R0,SBUF(0x99)
C:0x0429 C298 CLR RI(0x98.0)
C:0x042B B811F6 CJNE R0,#0x11,C:0424
C:0x042E 3099FD JNB TI(0x98.1),C:042E
C:0x0431 C299 CLR TI(0x98.1)
C:0x0433 F599 MOV SBUF(0x99),A
C:0x0435 22 RET 转自大虾网 http://www.daxia.com/list_1683.shtml
有一个矛盾总是在困扰我们---那就是计算机喜欢2进制(16进制)而人类已经习惯了10进制
传统的HEX--BCD通常都按二进制定义按权展开,再付以10进制调整来实现,速度太慢,效率低
我的思路是这样的2的12次方=4096=4100-4=1000H及每一个1000H可以看着"4100"如果有误
差可以从余数中扣除,如双字节数最多扣除16*4=64个,如果有余数,够扣就扣,不够扣从4100
个中次高位减一当100已经够了!如果你问16是怎么来得我告诉65536/4096=16下面是程序
DPTR中是待转换的双字节16进制数,转换的数据保存在34H33H32H31H30H五个连续单元中34H
为高,同样的道理把100=60H+4 4096/96最多商42 4*42=168
16=4096/256 64和128因为都是单字节所以运算非常简单,经过仿真对比其运行速度比传统
方式快12倍!!!!!!!
HEXBCD:MOV A,DPH ;16进制高位送A
ANL A,#0F0H;屏蔽A低四位
XRL DPH,A ;屏蔽DPH高四位
SWAP A ;A除以16 ( 注意这技巧)
MOV 32H,A ;把A个100放百位单元
RL A
RL A ;两次RL A相当于乘以4,这个4表示4A个千,也表示要扣除4A
;A*4096=A*(4000+100)-4A=4A*1000+A*100-4A
XCH A,DPL
SUBB A,DPL
XCH A,DPH
SUBB A,#00H;以上四条指令完成4A的扣除,结果高位在A,低位在DPH
JNC "够扣"
DEC 32H ;不够扣32H减一当百
MOV A,#101 ;本来是100这里用101是考虑C=1这样就节省一条指令CLR C
SUBB A,DPL
ADD A,DPH;A肯定小于64为什么?所以高位不计算了!
MOV B,#10
DIV AB
MOV 31H,A
MOV 30H,B
;以下的程序留给大家自己编写,按时叫作业哦社员们 5楼的思路有意思，不过本人现在基本不用纯汇编折腾了，隔几天再回头看自己写的汇编代码都觉得晕……至于printf，我也是能不用就不用。 5楼的兄弟提供了一个不错的思路，谢谢了。 5楼的思路不是问题，关键是如何整理出来，让我们这些习惯了C的人们能够方便的用上。 5楼的思路不是问题，关键是如何整理出来，让我们这些习惯了C的人们能够方便的用上。 经过仿真对比其运行速度比传统方式快12倍!!!!!!!
===============================================
快12倍表示有多快？能在100us内完成吗？（以标准12T的51运行于12MHz来算） 新思路：人类算法 51适用
万位 千位 百位 十位 个位
2 5 6
+ 2 5 6
------------------------------
12 30 36
+ 10 25 30
4 10 12
------------------------------
4 20 49 60 36
+ 3<-36->6
------------------------------
4 20 49 63 6
+ 6<-63->3
------------------------------
4 20 55 3 6
+ 5<-55->5
------------------------------
4 25 5 3 6
+ 2<-25->5
------------------------------
6 5 5 3 6
----------------------------------------------------------------------------
我不会汇编，所以只能写个类汇编出来了。等高手来改写优化。这个用在12MHz S51上，123周期(仅计算，没测)
WW EQU 30H;万位
QW EQU 31H;千位
BW EQU 32H;百位
SW EQU 33H;十位
GW EQU 34H;个位
MOV DPH,#FFH
MOV DPL,#FFH
;将DPH（ff）变成2.5.6
MOV A ,DPH
MOV B ,#100
DIV AB
MOV R0,A
MOV A,B;余数放A继续/10
MOV B,#10
DIV AB
MOV R1,A
MOV R2,B
;将DPL（ff）变成2.5.6
MOV A,DPL
MOV B,#100
DIV AB
MOV R3,A
MOV A,B
MOV B,#10
DIV AB
MOV R4,A
MOV R5,B
;开乘了256*6--6*6
MOV A,R5
MOV B,R2
MUL AB
MOV GW,A
;5*6
MOV A,R5
MOV B,R1;
MUL AB
MOV SW,A
;2*6
MOV A,R5
MOV B,R0
MUL AB
MOV BW,A
;256*5--6*5
MOV A,R4
MOV B,R2
MUL AB
ADD SW,A
;5*5
MOV A,R4
MOV B,R1
MUL AB
ADD BW,A
;2*5
MOV A,R4
MOV B,R0
MUL AB
MOV QW,A
;256*2---6*2
MOV A,R3
MOV B,R2
MUL AB
ADD BW,A
;5*2
MOV A,R3
MOV B,R1
MUL AB
ADD QW,A
;2*2
MOV A,R3
MOV B,R0
MUL AB
MOV WW,A
;开始合并--36/10=3(+QW) 余6(GW)
MOV A,GW
MOV B,#10
DIV AB
ADD SW,A
MOV GW,B
;sw
MOV A,SW
MOV B,#10
DIV AB
ADD BW,A
MOV SW,B
;bw
MOV A,BW
MOV B,#10
DIV AB
ADD QW,A
MOV BW,B
;qw ww
MOV A,QW
MOV B,#10
DIV AB
ADD WW,A
MOV QW,B 思路错了。0xabcd != 0xab * 0xcd 0xab=171
0xcd=205
0xabcd=43981
171*205=35055
是错了呢。高手就是高手。
那就只能DPH*256+DPL了 顺便问下cowboy你在另个贴中说的汇编<60us的算法是什么？能不能贴出来改造下方便C调用？ 号称世上最快的16bit二进制数转5位压缩BCD码的程序，最长56周期(标准51)。原理还没弄懂。
原作者：DENGM
;R2R3-->R5R6R7 小端
BIN2BCD:
MOVA, R3
ANLA, #0FCH
RR A
RR A
MOVR5,A
ADDA, R5
ADDA, R5
MOVR7,A
MOVA, R2
ANLA, #3
MOVR6,A
XRLA, R3
ANLA, #3
XRLA, R2
RR A
RR A
ADDA, R7
JNCL2
INCR5
ADDA, #6
L2: ADDA, R7
MOVB, #25
JNCL3
INCR5
ADDA, #6
DIVAB
SJMP L4
L3: DIVAB
CJNE A, #10, L4
INCR5
CLRA
L4: MOVR7,A
MOVA, #10
XCHA, B
ADDA, #(L5-$-3)
MOVC A, @A+PC
ADDA, R6
DA A
XCHA, R5
DIVAB
XCHA, R7
SWAP A
ORLA, B
SWAP A
MOVR6,A
RET
L5: DB 00H, 04H, 08H, 12H, 16H
DB 20H, 24H, 28H, 32H, 36H
DB 40H, 44H, 48H, 52H, 56H
DB 60H, 64H, 68H, 72H, 76H
DB 80H, 84H, 88H, 92H, 96H
END mark 能不能改造下方便C调用啊，做成库？ 无法验证正确性
http://cache.amobbs.com/bbs_upload782111/files_18/ourdev_484599.jpg
R2=0x12 R3=0x34 测试 (原文件名:QQ截图未命名.jpg) 0x34 12 = 1 33 30
r3 r2r7 r6 r5 mark 强~~~正在验证~~~ wolf11_1234 发表于 2009-9-17 14:19 static/image/common/back.gif
你的hex2bcd太臃肿了
用keil自带的库，反汇编回来看看
SIR:
WHERE IS THE "keil自带的库"?
THANKS. 懂了，下来看看。
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