endian.c

在51下的外挂硬盘和FLASH的MP3方案程序以及原理图

unsigned int MEMSwap16(unsigned int value);
unsigned long MEMSwap32(unsigned long value);

unsigned int MEMSwap16(unsigned int value)
{
	register unsigned int rval;

	((unsigned char *) &rval) [0] = ((unsigned char *) &value) [1];
	((unsigned char *) &rval) [1] = ((unsigned char *) &value) [0];
	return (rval);
}

unsigned long MEMSwap32(unsigned long value)
{
	register unsigned long rval;

	((unsigned char *) &rval) [0] = ((unsigned char *) &value) [3];
	((unsigned char *) &rval) [1] = ((unsigned char *) &value) [2];
	((unsigned char *) &rval) [2] = ((unsigned char *) &value) [1];
	((unsigned char *) &rval) [3] = ((unsigned char *) &value) [0];
 	return (rval);
}