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I'm trying to use a U2270B to read a trasponder. This chip uses Manchester code, I don't have doubts about the decoding process, but, how can I read the pulses? I don't know how to read the signal, pulse duration, etc.
Anybody has experience with that chip? I'm using a 16F628A, but the pcb is designed for a 12C672P.
Thanks
in VAR BIT
InTrs VAR PORTB.1 'On Out of U2270b
Read:
PauseUS 130 'for Osc 8
in=Intrs
If in=1 Then
....
if in=0 Then
....
etc..
Regards
Thanks!!
So I suppose that a complete pulse of the code (Manchester) uses 260 microseconds.
Is this correct?
In your sample you use PAUSEUS 130 for OSC 8, but if I use the internal resonator and don't use the OSC statement on my code (or if I use a 4Mhz external resonator), I suppose that the 130 value would still correct, isn't it? I don't know if you are adjusted the value for a 8Mhz resonator instead that picbasic adjust it via OSC statement.
Regards
in manchester code:
T=560µs and T/2=280µs
and i read 64 bits
my beta prog read ok the transponder but it need to be optimized!
i can send it if you need but comments are in french :(
Of course, your code will help me, if you can send me to [email protected] it would be great.
If you want I can test the code on my board and colaborate with you in the optimization of the read process.
Regards
Can you send the code to me as well? I need it for my project. Thanks!!
There are code examples already on the forum, do a SEARCH on "Manchester Code".
Thanks Melanie. Actually i need to read the data (manchester code) from a transponder and send it to pc using the USART feature in pic16f628A and using rs232 to interface.The problem now is i can't send the code to my pc through the microcontroller? Can you help me with that? I need it urgently. Hope to get reply from you soon!!
The PBP manual is pretty explicit in using the HPWM command. A search on HPWM currently produces 56 threads many with examples of usage. Let's not ask for further examples of what's already available and been repeated many times.
Quote:
Originally Posted by Melanie
I guess what Melanie was actually trying to say is:
See Manual Section 5.30 for HSERIN and Section 5.31 for HSEROUT
A Search on HSEROUT produces 127 threads with many examples!
Errr... Thanks Ralph... Brain's gone soft! Too much work and not enough party! But it's Saturday night...
The code is in your private box
Regards
The code will be very helpful to me.
Please send to me too.
Tank you