bcdhex.c

一个两碟控制的VCD的代码,两碟之间的转动及连续播放,已大量生产的CODE.

/* Copyright 1996, ESS Technology, Inc.					*/
/* SCCSID @(#)bcdhex.c	1.2 12/8/97 */

/*
 * $Log$
 */

/* Lookup table to convert HEX to BCD */
PRIVATE unsigned short hex2bcd[] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,	/* 00-09 */
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,	/* 10-19 */
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,	/* 20-29 */
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,	/* 30-39 */
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,	/* 40-49 */
    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,	/* 50-59 */
    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,	/* 60-69 */
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,	/* 70-79 */
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,	/* 80-89 */
    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,	/* 90-99 */
};

/* Lookup table to convert BCD to HEX */
PRIVATE unsigned short bcd2hex[] = {
     0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 0, 0, 0, 0, 0, 0,	/* 00-09 */
    10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0, 0, 0, 0, 0, 0,	/* 10-19 */
    20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 0, 0, 0, 0, 0, 0,	/* 20-29 */
    30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 0, 0, 0, 0, 0, 0,	/* 30-39 */
    40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 0, 0, 0, 0, 0, 0,	/* 40-49 */
    50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 0, 0, 0, 0, 0, 0,	/* 50-59 */
    60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 0, 0, 0, 0, 0, 0,	/* 60-69 */
    70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 0, 0, 0, 0, 0, 0,	/* 70-79 */
    80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 0, 0, 0, 0, 0, 0,	/* 80-89 */
    90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 0, 0, 0, 0, 0, 0,	/* 90-99 */
};

/* Look-up table for bit mask */
unsigned short ptrLshift[] = {0x0001, 0x0002, 0x0004, 0x0008,
			      0x0010, 0x0020, 0x0040, 0x0080,
			      0x0100, 0x0200, 0x0400, 0x0800,
			      0x1000, 0x2000, 0x4000, 0x8000};