Hello, I tried just running the M100 as a console on the built-in serial port on a B+ raspberry pi. With a simple converter from Sparkfun, the pi could recognize what was sent from the pi but the signals from the pi wouldn't drive the m100. I then invested in a level shifter with a max232.
I was running the console of the pi via the term program and I could then start dl from the m100. Obviously I couldn't exit the program from the m100 but was thinking of using the linux 'timeout' command to run dl for a fixed time, say 5 or 10 minutes. After dl exits, then I could command the pi from the m100 again, and shut it down 'properly' or do whatever..... I should mention that I generally run the pi via the serial port on the gpio port from a portable computer (and a cheap serial-usb adapter (ttl)), since I find it more convenient than yet another keyboard and trying to find a suitable screen. You can even power the pi it you connect the +5 v connector on the GPIO port but obviously this won't work when you connect to the m100. Alas, these have just been ideas and I haven't had the time to try this out. There are also baud rate issues. You probably want everything to run at 9600 baud (that's what works for using term as the pi console and xon/xoff works ok) but dl defaults to 19200. Just need to change it and recompile, and configure tiny or whatever to use 9600. If LaddieAlpha will return control to the serial port that would be yet another alternative. Wasn't this added as a feature quite recently? I can try to test some of this out this weekend but I don't want to promise anything at this point. Jonathan [email protected] ________________________________________ Från: M100 [[email protected]] för Stephen Adolph [[email protected]] Skickat: den 5 januari 2016 16:13 Till: Model 100 Discussion Ämne: Re: [M100] Raspberry Pi as TPDD yah, that's exactly what you'd want to do - set up serial comms on that sort of hardware hack. you don't need flow control for TPDD protocol.. it is self limiting since it is hand-shaking for every "packet" and each packet is small enough to be managed by the tiny M100 buffer. Steve On Tue, Jan 5, 2016 at 9:59 AM, VANDEN BOSSCHE JAN <[email protected]<mailto:[email protected]>> wrote: > But, you certainly can't plug the TTL signal into the M100. Bummer. It's never simple enough. Or … > So, to adapt the M100 to a TTL signal , you need to clamp at 0V/5V, and > invert. Can't that be done ? Anyway, I'll probably need something linke this ? http://pi4j.com/example/serial.html Actually, that expands the possibilities. I could use a Model A, and have one USB-port to spare. Can LaddieAlpha be customised to write the files to a USB-flashdrive ? That way, you turn the R.Pi off, and remove the USB-stick for file transfer. |\ _,,,--,,_ / ,`.-'`' ._ \-;;, |,4- ) )_ .;.( `'-' <---''(_/._)--'(_\_) Jan Vanden Bossche @ work From: M100 [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Stephen Adolph Sent: dinsdag 5 januari 2016 15:48 To: Model 100 Discussion Subject: Re: [M100] Raspberry Pi as TPDD Hi Jan, the M100 RS-232 port is not a TTL port, it is kind-of a low voltage hybrid. It doesn't provide true full swing RS-232. * M100 is inverted like standard RS-232 * the "high" voltage level is >> 5V * the "low" voltage is negative, but not by much. close to 0V. (by memory-- I'll have to have a schematic in front of me to confirm this....) A normal RS-232 signal is balanced, meaning it has a full swing ex. +10V/-10V. So, to adapt the M100 to a TTL signal , you need to clamp at 0V/5V, and invert. But, you certainly can't plug the TTL signal into the M100. ..Steve On Tue, Jan 5, 2016 at 9:40 AM, VANDEN BOSSCHE JAN <[email protected]<mailto:[email protected]>> wrote: John, > The pi already has a serial port it's just at TTL levels instead of rs232 Wasn't one of the criticisms of the Model T that its serial port was TTL-level (i.e. max 5 Volt) too ? If that is correct - and please do correct me if I'm wrong - then what's the problem ? |\ _,,,--,,_ / ,`.-'`' ._ \-;;, |,4- ) )_ .;.( `'-' <---''(_/._)--'(_\_) Jan Vanden Bossche @ work From: M100 [mailto:[email protected]<mailto:[email protected]>] On Behalf Of John R. Hogerhuis Sent: zaterdag 2 januari 2016 16:53 To: Model 100 Discussion Subject: Re: [M100] Raspberry Pi as TPDD Usually the first adapter shows up as /dev/ttyUSB0 If you have multiple you can have issues with which adapter is which name. There's a way to create udev rules so the same name is always bound to the same device. Power cycles: I suggest getting ups pico board or just always keeping it plugged in to something, could be a battery. As to the board: not really smaller no. The pi already has a serial port it's just at TTL levels instead of rs232. The board I've used is just a max232 chip to do the level conversion. I guess if you built the chip into the cable it could be smaller. Otherwise you're adding a daughter board. I prefer the USB serial devices unless you're out if USB ports. -- John. On Saturday, January 2, 2016, Jan-80 <[email protected]<mailto:[email protected]>> wrote: Hi, 2. LaddieAlpha on Mono were the the names I was looking for. If it works, I don't care about name or environment. I was just pondering aternatives. 4. /dev/ttyS0 is the first USB-port, then? Or is it the USB-port + a USB-2-serial adapter? 6. How do you manage power cycles? 5. If you build your own serial port, isn't that smaller? -- Greetings from the TyRannoSaurus Jan-80 On Fri, 1 Jan 2016 17:22:11 -0500, Stephen Adolph wrote: HI Jan, I am currently running a raspberry pi with laddieAlpha, and it is working well. Why do you want to use Desklink? In my case, Laddiealpha is listening to a TCP port however, not serial. Certainly it could use the /dev/ttyS0 port if you wanted to. John H is the expert here. ..Steve On Fri, Jan 1, 2016 at 10:46 AM, Jan-80 <[email protected]<mailto:[email protected]>> wrote: Hello, A happy New Year 2016 to all of you. I would like to use my old Raspberry Pi - an early Model B with only 256 MB RAM - as a TPDD replacement. It would also allow anyone with any type of old Raspberry Pi to do so. I am sure that, with the presentation of the Pi2, a lot of hobbyists are going to sell their first-generation Pi's and they can be picked up really cheap. Software: there have been 2 ways reported on this list on getting a TPDD emulator to work on the R.Pi. A third one was never mentioned, but might be possible also. Correct me if I'm wrong 1. re-compiling Desklink from the original source for the Raspbian environment. 2. running the Windows.NET based version of Desklink in the .NET-compatible environment of the R.Pi. (sorry, forgot the name) 3. is it possible to run a Desklink in DOS-emulated environment? (Just an idea of mine...) Hardware: come to think of it, some hardware stuff must also be considered. 4. Serial link simple: a USB-to-serial adapter does the trick. I have one, but don't know if it will work. How do I test this? 5. Isn't it possible to use the I/O pins from the R.Pi as a serial port? Does the TPDD need the control lines? 6. If you use the R.Pi as a TPDD, you're likely to turn it off an on as one. But the R.Pi is a computer, and you could ruin the filesystem by doing so. Isn't it better to use a hardware on/off button instead of simply pulling the plug? Like this one: http://www.raspberry-pi-geek.com/Archive/2013/01/Adding-an-On-Off-switch-to-your-Raspberry-Pi [http://www.vivaqua.be/facebook.png] Rejoignez-nous sur Facebook - Volg ons op Facebook DISCLAIMER Pensez à l'environnement, n'imprimez cette page et ses annexes que si c'est nécessaire. Ce message électronique, y compris ses annexes, est confidentiel et réservé à l’attention de son destinataire. Si vous n'êtes pas le destinataire de ce message, merci de le détruire et d’en informer l’expéditeur. Toute divulgation, copie ou utilisation de ce mail est dans ce cas interdite. La sécurité et l'exactitude des transmissions de messages électroniques ne peuvent être garanties. Denk aan het milieu; druk deze pagina en de bijlagen alleen af als het nodig is. Dit e-mailbericht (inclusief zijn bijlagen) is vertrouwelijk en is uitsluitend bestemd voor de geadresseerde. 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