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Kasper
Joined: 14 Jan 2004
Posts: 88
Location: Aurora, Ontario, Canada
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| KeeLoq Decoder. |
 Posted: Mon Feb 09, 2004 7:54 pm |
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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);
}
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Philies
Guest
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| Posted: Tue Feb 10, 2004 12:40 am |
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Hi Kasper
Have a look Microchip application note AN744 "Modular Mid-Range PICmicro® KEELOQ® Decoder in C" |
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Kasper
Joined: 14 Jan 2004
Posts: 88
Location: Aurora, Ontario, Canada
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| Posted: Tue Feb 10, 2004 9:59 am |
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| 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!  |
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Kasper
Joined: 14 Jan 2004
Posts: 88
Location: Aurora, Ontario, Canada
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| Posted: Wed Feb 11, 2004 11:19 am |
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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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