asc_to_char.c

单片机C源程序souce

/**************************************
File          :  ASC_TO_CHAR.C
Project       :  BDTRV20_MCU_V07
Description   :  将两个ASCII转换成二进制
Created       :  2006.11.7
Last updata   :  
Author        :  Sunzehui   [e-mail]
Compile Tool  :  Keil uVision2
Target Device :  SST89V564RD
Circuit Board :  BD7700
************************************
Modification History
************************************
 Version      : v2.0
 Date         : MM/DD/YYYY
 Modifier     :
 Description  :

 **********************************
 -- Copyright (c)
*************************************/


extern unsigned char asc_to_char(unsigned char a1,unsigned char a2,bit m)
	{
	if (m==0)
		return ((a1-0x30)*10+a2-0x30);
	else
        if ((a1>='0'&&a1<='9')&&(a2>='0'&&a2<='9'))
		    return ((a1-0x30)*16+a2-0x30);
       else if ((a1>='0'&&a1<='9')&&(a2>='A'&&a2<='Z'))
		    return ((a1-0x30)*16+a2-0x37);
       else if ((a1>='A'&&a1<='Z')&&(a2>='0'&&a2<='9'))
		    return ((a1-0x37)*16+a2-0x30);
       else if ((a1>='A'&&a1<='Z')&&(a2>='A'&&a2<='Z'))
		    return ((a1-0x37)*16+a2-0x37);
	}