manchester decode

[temtronic]

I didn't see where you enabled timer0 interrupt after getting the 'sync'? in version 4.
You have to enable it.

[bulut_01]

In the an744 document, the timer0 interrupt is never closed. The initreceiver() timer interrupt is reset. The timer0 interrupt is always open. Isn't this interrupt a 72 ms cycle? Let me ask the same question again.

[temtronic]

AN744 was written 20 years ago as a proper ,legit program to decode a device sending 'Manchester ' formatted data. There are 100s of versions of this on the web of course.

Your 'transmitter' is NOT a proper ,legit MANCHESTER device !!! It does NOT follow the MANCHESTER protocol, that's why YOU have to modify it.

Now if you knew the company that made the device,you could ask them how their receiver works as it is NOT a 'Manchester' receiver or use Google to find someone who has 'reverse engineered' the receiver.

BTW ,take out the delay_ms(50) line I have. I needed it to compile.

[bulut_01]

If you are saying this for pre-data, we have taken care of the preamp sync part, the rest is standard manchester. If you have another working manchester decode code, please share it.

[temtronic]

The code in AN744 was specific to KEELOQ technology not 'Manchester'.

Have a look at the 'bit times' ( Te ?) see what changes you have to do to have the ISR properly capture your bits. Maybe search for 'key fob manchester decoder' or whatever the 'remote' device is. You could modify the An744 code as it was also able to 'learn' a KEELOQ device


again, I don't have your transmitter so I can't test any code create.
odds are real good you're not the 1st to do it !

[bulut_01]

If this AN744 Manchester decoder does not work, why have we been rowing in vain until now?

[temtronic]

It's a VERSION of Manchester, the 'core' is good.
Actually, there's 2 according to Wikipedia....
As long as you know the width of a '1' or a '0' and which 'version', and the actual data format, it's pretty easy.

AN744 is a working example of KEELOQ, of which they use 'Manchester'.
Your 'transmitter' doesn't just use Manchester hence the problem.

[bulut_01]

What changes should be made to this code based on the width of 1 ?

[gaugeguy]

You have made a lot of statements about what you have for hardware. Many of those don't seem accurate. Only you know what you have, or maybe you are not even sure.

[bulut_01]

[temtronic]

What's the receiver look like? post a picture and one of the 'computer' for ID info.