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.
Code:
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
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