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KeeLoq Decoder.

 
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Kasper



Joined: 14 Jan 2004
Posts: 88
Location: Aurora, Ontario, Canada

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KeeLoq Decoder.
PostPosted: Mon Feb 09, 2004 7:54 pm     Reply with quote
Hi. I am trying to get a Microchip KeeLoq encoder/decoder pair working. I am currently working on getting the decoder to work, before getting the encoder going, and I am running into a bit of trouble, which I hope someone here could shed some light on.

This is the code I use to initialize the decoder (HCS515) http://www.microchip.com/1010/pline/security/keysecat/decoders/devices/hcs515/index.htm

I think that the datastream to the decoder is right, verified with oscilloscope, but the S_CLK line never goes high to verify that it received it. Is there anything wrong with the code, am I goofing somewhere? any insight would be appreciated

Thanks in advance

Kasper
PCH 3.184, PIC 18F6720, WinXP PRO SP1, ICD2
Code:


#define KeeLoqREAD        0xF0
#define KeeLoqWRITE        0xE1
#define KeeLoqACTIVATE_LEARN     0xF0
#define KeeLoqERASE_ALL        0xC3
#define KeeLoqPROGRAM        0xB4
#define CRYPT           ABCDEF               // the actual 64 bit crypt key
#define TREQ      50   // min 0.005 max 500 ms
#define TRESP      100      // suggested value
#define   TSTART      100      // suggested Value
#define TCLKH      100      //  microsecond delay Clock High
#define TCLKL      100      //  microsecond delay Clock Low
#define   T_ACK      50


void init_keeloq(void) {
char CryptKey[8];
long int i;
char temp[1];
strcpy(CryptKey,"CRYPT");
output_high(S_CLK);
   delay_ms(TREQ);   
   output_low(S_CLK);
   delay_us(TSTART);   // ready for programming mode.
   // here the 80 bits of data is shifted to the KeeLoq decoder.

temp[0] = KeeloqPROGRAM;
for(i=0;i<(8);i++) {
   output_bit(S_DAT,shift_right(temp,1,1)); // shifts out the data from the receiveBuffer
   output_high(S_CLK);
   delay_us(TCLKH);   
   output_low(S_CLK);
   delay_us(TCLKL);   
}

temp[0] = 0x00; // config byte.
for(i=0;i<(8);i++) {
   output_bit(S_DAT,shift_right(temp,1,1)); // shifts out the data from the receiveBuffer
   output_high(S_CLK);
   delay_us(TCLKH);   
   output_low(S_CLK);
   delay_us(TCLKL);   
}   

   //   shift out the 64 bit Crypt Key
for(i=0;i<(64);i++) {   // always 64 bits to be shifted out, hence hardcoded.
   output_bit(S_DAT,shift_right(CryptKey,8,1)); // shifts out the data from the receiveBuffer
   output_high(S_CLK);
   delay_us(TCLKH);   
   output_low(S_CLK);
   delay_us(TCLKL);   
   }// end of for.
output_float(S_DAT);
output_high(S_CLK);
delay_ms(T_ACK);
output_low(S_CLK);

delay_ms(50);
}
Philies
Guest
PostPosted: Tue Feb 10, 2004 12:40 am     Reply with quote
Hi Kasper

Have a look Microchip application note AN744 "Modular Mid-Range PICmicro� KEELOQ� Decoder in C"
Kasper



Joined: 14 Jan 2004
Posts: 88
Location: Aurora, Ontario, Canada

View user's profile Send private message Visit poster's website

PostPosted: Tue Feb 10, 2004 9:59 am     Reply with quote
Philies wrote:
Hi Kasper

Have a look Microchip application note AN744 "Modular Mid-Range PICmicro� KEELOQ� Decoder in C"


Thanks for the link, but unfortunately I am using a seperate decoder chip, the HCS515, which is the one I am having trouble with. .. it is not Acknowledging that I am sending commands to it... anyone with ideas for that?
Interesting thing how they dedicate a whole microcontroller to do the decoding in that app note! Shocked
Kasper



Joined: 14 Jan 2004
Posts: 88
Location: Aurora, Ontario, Canada

View user's profile Send private message Visit poster's website

PostPosted: Wed Feb 11, 2004 11:19 am     Reply with quote
well I got it working.. I was just not waiting long enough for the ack bit.. damn this thing is slow!

Code:

void init_keeloq(void) {
char CryptKey[8];
long int i;
char temp[1];
strcpy(CryptKey,"CRYPT");
output_low(S_DAT);
output_float(S_DAT);
output_high(S_CLK);
   while(bit_test(PORTE,7) == 0) {
   }
   delay_us(TRESP);   
   output_low(S_CLK);
   while(bit_test(PORTE,7) == 1) {
   }   
   delay_us(TSTART);   // ready for programming mode.
   // here the 80 bits of data is shifted to the KeeLoq decoder.

temp[0] = KeeloqPROGRAM;
for(i=0;i<(8);i++) {
   output_bit(S_DAT,shift_right(temp,1,1)); // shifts out the data from the receiveBuffer
   output_high(S_CLK);
   delay_us(TCLKH);   
   output_low(S_CLK);
   delay_us(TCLKL);   
}

temp[0] = 0x00; // config byte.
for(i=0;i<(8);i++) {
   output_bit(S_DAT,shift_right(temp,1,1)); // shifts out the data from the receiveBuffer
   output_high(S_CLK);
   delay_us(TCLKH);   
   output_low(S_CLK);
   delay_us(TCLKL);   
}   

   //   shift out the 64 bit Crypt Key
for(i=0;i<(64);i++) {   // always 80 bits to be shifted out, hence hardcoded.
   output_bit(S_DAT,shift_right(CryptKey,8,1)); // shifts out the data from the receiveBuffer
   output_high(S_CLK);
   delay_us(TCLKH);   
   output_low(S_CLK);
   delay_us(TCLKL);   
   }// end of for.
   output_float(S_DAT);
   delay_ms(1);
   output_high(S_CLK);
   while(bit_test(PORTE,7) == 0) {
   }
delay_ms(1);
output_low(S_CLK);
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