rs232 communication problem

[koray_duran]

Hello,

I work on a fingerprint sensor, i try to communicate with it.
It makes me crazy. I need your help.

I will send a command like this :
char test[] = {0x02, 0x00, 0xD', 0x00, 0x00, 0x00}; //
And after that i need to receive an answer and compare it like this :
char testok[] = {0x02, 0x08, 0x00, 0x00}; //

I tried something like this :
i=0;
while (capenrlram[i] != 0xAA){printf("%c", capenrlram[i++]);}

But it doesnt work proper. Also i have problem to get answer and compare with "testok" variable. I tried to use "gets" command for this.

By the way, my serial setting is this but the parity of module is Odd.
#use rs232(baud=9600,parity=N,xmit=PIN_A2,rcv=PIN_A3,bits=8, stream=UART)

Please guys help me with this.

[PCM programmer]

[koray_duran]

...

[asmboy]

You are gonna have some fun with the 4 byte CRC calcs 4 this puppy.
your fun is JUST BEGINNING!

[asmboy]

as in this:

The CRC calculation can be implemented as a table of pre-computed effects to ensure efficiency. The CRC value is 32 bits long. The table is indexed by the byte to be encoded and thus the table contains 256 double words (256 * 32 bits). The CRC algorithm implementation was initially developed by the University of California, Berkeley and its contributors, but has been changed and somewhat simplified to fit the embedded nature of FPC-AM3. The algorithm uses the CCITT-32 CRC Polynomial.

[koray_duran]

Thanks for answering asmboy but I don't think that I need using crc or something.
Commands and answers are clear.
I am not qualified in C language so I have this problems.