putnum.c

自学ZedBoard：使用IP通过ARM PS访问FPGA（源代码）

/* putnum.c -- put a hex number on the output device.
 * 
 * Copyright (c) 1995 Cygnus Support
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice is included verbatim in any distributions. No written agreement,
 * license, or royalty fee is required for any of the authorized uses.
 * Modifications to this software may be copyrighted by their authors
 * and need not follow the licensing terms described here, provided that
 * the new terms are clearly indicated on the first page of each file where
 * they apply.
 */

/*
 * putnum -- print a 32 bit number in hex
 */

extern void print (char* );

void putnum(unsigned int num)
{
  char  buf[9];
  int   cnt;
  char  *ptr;
  int   digit;
  
  ptr = buf;
  for (cnt = 7 ; cnt >= 0 ; cnt--) {
    digit = (num >> (cnt * 4)) & 0xf;
    
    if (digit <= 9)
      *ptr++ = (char) ('0' + digit);
    else
      *ptr++ = (char) ('a' - 10 + digit);
  }

  *ptr = (char) 0;
  print (buf);
}