CFA633-RDI-KS datasheet(80/88 Pages) CRYSTAIFONTZ

80 / 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 80

data = 5

my $type = '80';

my $length = '01';

my $data = '05';

my $packet = chr(hex $type) .chr(hex $length) .chr(hex $data);

my $valid_crc = '5584' ;

print "A CRC of Packet ($packet) Should Equal ($valid_crc)\n";

my $crc = 0xFFFF ;

printf("%x\n", $crc);

foreach my $char (split //, $packet)

{

# newCrc = (newCrc >> 8) ^ crcLookupTable[(newCrc ^ *bufptr++) & 0xff];

# & is bitwise AND

# ^ is bitwise XOR

# >> bitwise shift right

$crc = ($crc >> 8) ^ $CRC_LOOKUP[($crc ^ ord($char) ) & 0xFF] ;

# print out the running crc at each byte

printf("%x\n", $crc);

}

# get the complement

$crc = ~$crc ;

$crc = ($crc & 0xFFFF) ;

# print out the crc in hex

printf("%x\n", $crc);

Algorithm 7: For PIC18F8722 or PIC18F2685

This code was written by customer Virgil Stamps of ATOM Instrument Corporation for our CFA635 module.

; CRC Algorithm for CrystalFontz CFA635 display (DB535)

; This code written for PIC18F8722 or PIC18F2685

;

; Your main focus here should be the ComputeCRC2 and

; CRC16_ routines

;

;===================================================================

ComputeCRC2:

movlb

RAM8

movwf

dsplyLPCNT

;w has the byte count

nxt1_dsply:

movf

POSTINC1,w

call

CRC16_

decfsz

dsplyLPCNT

goto

nxt1_dsply

movlw

; shift accumulator 16 more bits

call

CRC16_

movlw

call

CRC16_

comf

dsplyCRC,F

; invert result

comf

dsplyCRC+1,F

return

;===================================================================

CRC16_ movwf:

dsplyCRCData

; w has byte to crc

movlw

movwf

dsplyCRCCount

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