CFA633-RDI-KS datasheet(71/88 Pages) CRYSTAIFONTZ

71 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 71

APPENDIX C: DEMONSTRATION SOFTWARE AND

SAMPLE CODE

We encourage you to use the free sample code listed below. Please leave the original copyrights in the code.



Windows compatible test/demonstration program and source.

http://www.crystalfontz.com/product/633WinTest#docs



Linux compatible command-line demonstration program with C source code. 8K.

http://www.crystalfontz.com/product/linux_cli_examples#docs



Supported by CrystalControl freeware.

http://www.crystalfontz.com/product/CrystalControl2.html

In addition, see http://lcdproc.org/hardware.php3 for Linux LCD drivers. LCDproc is an open source project that supports

many of the Crystalfontz displays.

ALGORITHMS TO CALCULATE THE CRC

Below are eight sample algorithms that will calculate the CRC of a CFA633 packet. Some of the algorithms were

contributed by forum members and originally written for the CFA631 aand CFA635. The CRC used in the CFA633 is the

same one that is used in IrDA, which came from PPP, which seems to be related to a CCITT (ref: Network Working Group

Request for Comments: 1171) standard. At that point, the trail was getting a bit cold and diverged into several referenced

articles and papers, dating back to 1983.

The polynomial used is X16 + X12 + X5 + X0 (0x8408)

The result is bit-wise inverted before being returned.

Algorithm 1: “C” Table Implementation

This algorithm is typically used on the host computer, where code space is not an issue.

//This code is from the IRDA LAP documentation, which appears to

//have been copied from PPP:

// http://irda.affiniscape.com/associations/2494/files/Specifications/

IrLAP11_Plus_Errata.zip

//I doubt that there are any worries about the legality of this code,

//searching for the first line of the table below, it appears that

//the code is already included in the linux 2.6 kernel "Driver for

//ST5481 USB ISDN modem". This is an "industry standard" algorithm

//and I do not think there are ANY issues with it at all.

typedef unsigned char ubyte;

typedef unsigned short word;

word get_crc(ubyte *bufptr,word len)

{

//CRC lookup table to avoid bit-shifting loops.

static const word crcLookupTable[256] =

{0x00000,0x01189,0x02312,0x0329B,0x04624,0x057AD,0x06536,0x074BF,

0x08C48,0x09DC1,0x0AF5A,0x0BED3,0x0CA6C,0x0DBE5,0x0E97E,0x0F8F7,

0x01081,0x00108,0x03393,0x0221A,0x056A5,0x0472C,0x075B7,0x0643E,

0x09CC9,0x08D40,0x0BFDB,0x0AE52,0x0DAED,0x0CB64,0x0F9FF,0x0E876,

0x02102,0x0308B,0x00210,0x01399,0x06726,0x076AF,0x04434,0x055BD,

0x0AD4A,0x0BCC3,0x08E58,0x09FD1,0x0EB6E,0x0FAE7,0x0C87C,0x0D9F5,

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