helpers.c

来自「Boot code for ADM5120 with serial consol」· C语言 代码 · 共 61 行

/*****************************************************************************
;
;    Project : Edimax
;    Creator :
;    File    : helpers.c
;    Abstract: Data formats for printing (non-network)
;
;*****************************************************************************/

#include <ctype.h>
#include <helpers.h>


/*	Convert an unsigned long value to a 4-hex-digit string
 */

int ultoa(unsigned long num, char *str)
{
	unsigned int tmp;
	int i;

	for (i = 0; i < 8; i++) {
		tmp = ((num >> (32 - (i + 1) * 4)) & 0x0000000F);

		if (tmp >= 0x0A && tmp <= 0x0F)
			tmp = tmp + 55;
		else 
			tmp = tmp + 48;

		str[i] = (char) tmp;
	}

	str[i] = '\0';
	return 0;
}


/*	Convert a byte value to a 2-hex-digit string
 */

int btoa(char num, char *str)
{
	unsigned int tmp;
	int i;

	for (i = 0; i < 2; i++) {
		tmp = ((num >> (8 - (i + 1) * 4)) & 0x0F);

		if (tmp >= 0x0A && tmp <= 0x0F)
			tmp = tmp + 55;		// add 'A'
		else
			tmp = tmp + 48;		// add '0'

		str[i] = (char) tmp;
	}

	str[i] = '\0';

	return 0;
}