Post by thread:[PIC] debugging tool

Hi! IIRC there was some kind of small debugging tool described on piclist.com, kind of pic-based device with display, which could display messages sent from other PIC circuit under testing. I just have no idea what to search for to find it. I just want to learn a bit, but LCD interface wants too many pins, serial connection to PC wants too many cycles. Any ideas? PS. I'm using linux, so pickit2 debugging is out of question. -- KPL

>IIRC there was some kind of small debugging tool described on >piclist.com, kind of pic-based device with display, which could >display messages sent from other PIC circuit under testing. I just >have no idea what to search for to find it. >I just want to learn a bit, but LCD interface wants too many pins, >serial connection to PC wants too many cycles. There was a couple, Jinx had some form of display that went to another PIC to display on an LCD IIRC, and one of the Bobs' used a morse type single pin transmission to send register info out to another PIC for display. Ah, found the latter, Bob Axtell had a message back in 2004 with the subject line '[PIC]:Bob's 1-Pin Diagnostic Signal (Was: The Read / Modify / Write stuff)'

KPL wrote: > Hi! > > IIRC there was some kind of small debugging tool described on > piclist.com, kind of pic-based device with display, which could > display messages sent from other PIC circuit under testing. I just > have no idea what to search for to find it. > I just want to learn a bit, but LCD interface wants too many pins, > serial connection to PC wants too many cycles. > > Any ideas? > > PS. I'm using linux, so pickit2 debugging is out of question. > > Serial connection to PC doe snot take too many cycles if the PIC has a UART.... which PIC are you testing? Rolf

>> > Serial connection to PC doe snot take too many cycles if the PIC has a > UART.... which PIC are you testing? > > Rolf > Yes, but RX/TX pins can be used for something else, I would like if I could change pins where debug tool is connected. Alan, thanks. That's what I was looking for. -- KPL

I have developed such a protocol, but the tool has not been made yet (to read the signal). Mine uses an IR beam for the output Hi! {Quote hidden}> > IIRC there was some kind of small debugging tool described on > piclist.com, kind of pic-based device with display, which could > display messages sent from other PIC circuit under testing. I just > have no idea what to search for to find it. > I just want to learn a bit, but LCD interface wants too many pins, > serial connection to PC wants too many cycles. > > Any ideas? > > PS. I'm using linux, so pickit2 debugging is out of question. > > -- > KPL > -

Yes, I can provide this if somebody wants. Send to spam_OUTengineerTakeThisOuTcotse.net. On Wed, Jul 9, 2008 at 9:47 AM, Alan B. Pearce <.....A.B.PearceKILLspam@spam@rl.ac.uk> wrote: {Quote hidden}> >IIRC there was some kind of small debugging tool described on > >piclist.com, kind of pic-based device with display, which could > >display messages sent from other PIC circuit under testing. I just > >have no idea what to search for to find it. > >I just want to learn a bit, but LCD interface wants too many pins, > >serial connection to PC wants too many cycles. > > There was a couple, Jinx had some form of display that went to another PIC > to display on an LCD IIRC, and one of the Bobs' used a morse type single > pin > transmission to send register info out to another PIC for display. > > Ah, found the latter, Bob Axtell had a message back in 2004 with the > subject > line > '[PIC]:Bob's 1-Pin Diagnostic Signal (Was: The Read / Modify / Write > stuff)' > > -

OK, I'm not sure any more this is what I was looking for:) I had the latest of them in my mailbox, But I was not there in 2004, so all I could find on the other one is: www.piclist.com/techref/new/letter/news0402.htm?key=%22Diagnostic+Signal%22&from= which does not tell much. somehow I am not able to find that thread on piclist.com :( It shows hundreds of hits or just the one above, depending on part of the string I search. I am using quotes, I am trying to escape special symbols like single quote, but that does not help. May be that just means I should design that tool by myself:) On Wed, Jul 9, 2008 at 8:22 PM, KPL <kpl.listesKILLspamgmail.com> wrote: {Quote hidden}>>> >> Serial connection to PC doe snot take too many cycles if the PIC has a >> UART.... which PIC are you testing? >> >> Rolf >> > > Yes, but RX/TX pins can be used for something else, I would like if I > could change pins where debug tool is connected. > > > Alan, thanks. That's what I was looking for. > > -- > KPL > -- KPL

> I just want to learn a bit, but LCD interface wants too many pins, > serial connection to PC wants too many cycles. BTW there are a couple of circuits out there for 2-pin serial using a shift register. And you can pretty much do what you want with any LCD pin, for example having the LCD in parallel with other devices, if you leave EN alone until you actually want to exchange (ie read or write) data with the screen

part 1 425 bytes content-type:text/plain; (decoded 7bit) > LCD interface wants too many pins KPL, attached is an unusual multiplexing idea that you might find useful if you have a keypad and LCD. I tried it briefly, seems to work OK. Basically, two functions. Clock the 4040 and check the i/p for a high that corresponds to the Q value, or clock the 4040 to the nybble data for the LCD. RS could be Q6, saves a pin, takes a little more time part 2 1843 bytes content-type:image/gif; (decode) part 3 35 bytes content-type:text/plain; charset="us-ascii" (decoded 7bit)

> Clock the 4040 and check the i/p for a high that corresponds > to the Q value Sorry, that came out all wrong Clock the 4040 to Q-1 and check for a low. IOW, in sequence, set the 4040 outputs to a rotating 0 (11110, 11101, 11011 etc)

Just having another look at that 4040 circuit (which is not mine BTW, from a Silicon Chip project). As the 4040 reset is active high, an RC on it would mean you could use EN, saving a pin In theory then, an LCD and twelve push-buttons using 3 pins

>> I just want to learn a bit, but LCD interface wants too many pins, >> serial connection to PC wants too many cycles. > >BTW there are a couple of circuits out there for 2-pin serial using >a shift register. Such as Myke Predkos one ... http://www.rentron.com/Myke1.htm

On 10 Jul 2008 at 9:53, Alan B. Pearce wrote: > >> I just want to learn a bit, but LCD interface wants too many > pins, > >> serial connection to PC wants too many cycles. > > > >BTW there are a couple of circuits out there for 2-pin serial > using > >a shift register. > > Such as Myke Predkos one ... > http://www.rentron.com/Myke1.htm > That is a good one! Recommended! Mark Jordan