rfid_bcd.c

来自「找的一个用U2270B开发的射频卡项目文件」· C语言 代码 · 共 38 行

// $Id: rfid_Bcd.c,v 1.1 2006/09/25 22:08:15 tprescott Exp $
/***************************************************************************
Project : rfid_Bcd.c
Date    : 9/08/2006
Author  : Toby Prescott                   
Company : Atmel                           
Comments: AVR Studio GCC

Revisions:
	v1.0 - Started written for CodeVision 
	v2.6 - Clean for WinAVR
***************************************************************************/
#include "rfid_Bcd.h"


/*****************************************************************************
*   Function name : CHAR2BCD2
*   Purpose :       Convert a character into a BCD encoded character.
*                   The input must be in the range 0 to 99.
*                   The result is byte where the high and low nibbles
*                   contain the tens and ones of the input.
*****************************************************************************/
char bcd_CHAR2BCD2(char input)
{
    char high = 0;
    
    
    while (input >= 10)                 // Count tens
    {
        high++;
        input -= 10;
    }

    return  (high << 4) | input;        // Add ones and return answer
}