Need to convert C to PBP

[timmers]

I am trying to write some code in PBPpro from an example in C.
I have got so far but am not familiar with C.
They give the packet structure and an example, but I cannot decipher what the code is doing before retrieving a value from a lookup table, and hopefully someone will be able to assist me here.

Any help greatly appreciated.

By the way, attachment is copyright Atomos Pty, Australia.

CHKSUM		VAR LONG
VALUE		VAR LONG
COMMAND		VAR WORD
SIZE		        VAR WORD
TEMP_W		VAR WORD
TEMP_B		VAR BYTE
BUFFER		VAR BYTE [21]

SEND:		 SIZE = $14
			COMMAND = 0
			VALUE = 1
			
			BUFFER [1] = SIZE.BYTE1
			BUFFER [2] = SIZE.BYTE0
			BUFFER [3] = COMMAND.BYTE1
			BUFFER [4] = COMMAND.BYTE0
			BUFFER [5] = $FF
			BUFFER [6] = $FF
			BUFFER [7] = $FF
			BUFFER [8] = $FF
			BUFFER [9] = $FF
			BUFFER [10] = $FF
			BUFFER [11] = $FF
			BUFFER [12] = $FF
			BUFFER [13] = VALUE.BYTE3
			BUFFER [14] = VALUE.BYTE2
			BUFFER [15] = VALUE.BYTE1
			BUFFER [16] = VALUE.BYTE0
			
			SOMEVALUE = ' <insert converted C code here >
			GOSUB LOOK_CHKSUM
			
			BUFFER [17] = CHKSUM.BYTE3
			BUFFER [18] = CHKSUM.BYTE2
			BUFFER [19] = CHKSUM.BYTE1
			BUFFER [20] = CHKSUM.BYTE0
			
			
			FOR TEMP_W = 1 TO SIZE
				TEMP_B = BUFFER [TEMP_W]
				HSEROUT [TEMP_B]
			NEXT
			GOTO MAIN_LOOP
			
			
LOOK_CHKSUM:
                        LOOKUP2 SOMEVALUE,_
				[$0000, $1021, $2042, etc ], CHKSUM
			RETURN

[timmers]

Dohh... Here is the attachment.

[scrwld]

hi timmers, you example is for calculate cyclic redundancy check (CRC16). look here two example one using Vb6 the another one with PBP. i use both

http://www.picbasic.co.uk/forum/showthread.php?t=16735

here explain how to that:

http://en.wikipedia.org/wiki/Computation_of_CRC

[Archangel]

I am still struggling to learn C myself so what I say here MAY BE TOTALLY INCORRECT.

const u16 crc_16_table[0x100]

const u16 = dataType , crc_16_table = varName, [0x100] = startMemLocation, & this can be put into program memory with PROGMEM command at least in arduino.
HTH