Post by thread:[PIC] 18F2620 version of Cheap Logic Analzyer is n

I finished up my first version of the 18F2620 cheap logic analyzer (about $10) which is capable of taking 3936 samples at a 5M sample/second rate (200ns/sample). You can find the new project here: http://www.tedrossin.0sites.net/Electronics/Pic/Pic.html I added a voltmeter mode where the 5 analog inputs of the PIC are sampled and displayed on the screen. I also implemented run length encoding for transferring the samples in order to get the update rate a bit faster over the ~10Kbyte/sec serial port. The PC side software can cleanly update the PIC firmware so as new versions are available, the changes will not require pulling the part off the board. I also created a bootloader for some of the 18F devices that can found on that page as well. Let me know if you find problems. -- View this message in context: old.nabble.com/18F2620-version-of-Cheap-Logic-Analzyer-is-now-available-tp30366567p30366567.html Sent from the PIC - [PIC] mailing list archive at Nabble.com.

Why not using a PIC32 @ 80MIPS+ DMA + 128k RAM + USB ? Its DMA controller seems to have some sort of pattern recognition that perhaps can be used as a trigger. Perhaps 40MS/s or more possible. Isaac Em 3/12/2010 16:27, trossin escreveu: {Quote hidden}> I finished up my first version of the 18F2620 cheap logic analyzer (about > $10) which is capable of taking 3936 samples at a 5M sample/second rate > (200ns/sample). You can find the new project here: > > http://www.tedrossin.0sites.net/Electronics/Pic/Pic.html > > I added a voltmeter mode where the 5 analog inputs of the PIC are sampled > and displayed on the screen. I also implemented run length encoding for > transferring the samples in order to get the update rate a bit faster over > the ~10Kbyte/sec serial port. The PC side software can cleanly update the > PIC firmware so as new versions are available, the changes will not require > pulling the part off the board. > > I also created a bootloader for some of the 18F devices that can found on > that page as well. > > Let me know if you find problems. > __________________________________________________ Fale com seus amigos de graça com o novo Yahoo! Messenger http://br.messenger.yahoo.com

On 03/12/2010 21:31, Isaac Marino Bavaresco wrote: > Why not using a PIC32 @ 80MIPS+ DMA + 128k RAM + USB ? > > Its DMA controller seems to have some sort of pattern recognition that > perhaps can be used as a trigger. > > Perhaps 40MS/s or more possible. > > > Isaac > I messed about with a PIC32 doing pretty much that a while back (while researching different ideas for cheap scopes) Managed about 25Msps if I recall right. I used a couple of linear assembly routines for the critical bits. I briefly tried the DMA too, worked okay, pretty sure that could be made to work as you say with the pattern recognition etc (I didn't get that far) Ideally, I would use a small FPGA though with some onboard RAM, perfect for this kind of stuff. Of course for hobby purposes PIC32 and FPGAs are "harder" (In the sense a lot of people just don't touch the fine pitch SMD packages) to deal with, so this is more accessible (I think maybe that was one of the goals) I have occasionally made use of the PicKit2 Logic Analyser in the past, similar specs I think (maybe a bit slower) Looks like a nice little project though, sure many people (especially hobbyists, well written up with easily sourced, prototyped parts) would find this very handy... {Quote hidden}> Em 3/12/2010 16:27, trossin escreveu: >> I finished up my first version of the 18F2620 cheap logic analyzer (about >> $10) which is capable of taking 3936 samples at a 5M sample/second rate >> (200ns/sample). You can find the new project here: >> >> www.tedrossin.0sites.net/Electronics/Pic/Pic.html >> >> I added a voltmeter mode where the 5 analog inputs of the PIC are sampled >> and displayed on the screen. I also implemented run length encoding for >> transferring the samples in order to get the update rate a bit faster over >> the ~10Kbyte/sec serial port. The PC side software can cleanly update the >> PIC firmware so as new versions are available, the changes will not require >> pulling the part off the board. >> >> I also created a bootloader for some of the 18F devices that can found on >> that page as well. >> >> Let me know if you find problems. >> > __________________________________________________ > Fale com seus amigos de graça com o novo Yahoo! Messenger > http://br.messenger.yahoo.com/