Subject: RE: [Elmer 160] PIC El Programming Problems
From: Kevin M., W8VOS (adverseyaw@twmi.rr.com)
Date: Fri Feb 27 2004 - 20:24:25 EST
Craig and gang, > Please tell me more about this. I assume you mean that you > see CTS swinging from > +4v (nominal "high") to -4v (nominal "low"). Something like > that, right? No, it is only swinging from +4 to +0.4V > When you say it does read data from the PIC, do you mean that > you program the > PIC with your other (PICALL) programmer and then read it back > with the PIC-EL? And does this yield all "correct" data? If > so, it indicates that your clock pulse (RB7) > is OK. If your Data pulse (RB6) shows similar voltage swings > when you Write, it > should be OK too. Yes. It reads the program I am able to install with the PICALL. > >However, I still am unable to > >program. Once again, just the first Program Memory location > and always > >a h0000. This in itself might be telling us something. Here > is what I > >think... The FPP program is dutifully sending the > information out the > >comm port and the PIC-EL is receiving it. Now since it is > all zeros or > >low levels, perhaps the programming voltage isn't enough and > each bit > >is a 'low'. So that is what the PIC-EL programs. > > Do you have a solid 5v (or close) coming out of the U2 > voltage regulator? Again, I would like to know what "high" > and "low" voltage levels you see at > RB6 and RB7 when you are trying to Write to the PIC. Yes, 5V on the money. My problem appears to be RB7. It is only getting to 1.2V, which is a low. RB6 is getting up to 1.6V. What could cause this? > > FPP now reads back the > >first memory location and finding something different then was sent, > >shuts down with "Failed to Program!". > > Yes, it will shut down quickly if it detects an error. > > >My program voltage is 11.58V however I am supplying 15.08V > with a wall > >wart (unregulated 12VDC @ 200ma). Is this normal? The > 11.58V I mean. > >73/72 - Kevin, W8VOS > > That should be fine. The voltage is limited to 11.58v by the > zener diode. > > If you put your volt meter on PIC pin 4 (MCLR) as you start > to program what > do you see? It should go to zero (to reset the PIC) and > then very quickly jump up > to 11.5v to start the programming sequence. Yes. It starts at ~.72V and jumps to 11.56V with the read. I can only get a good test on it in read as that is working and FPP doesn't shut down with the error. In program I only have milliseconds to read the voltage.
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