I just got your arduino code working on a Teensy 3.6, using the built-in card reader, SdFatSdioEX, hardware flow control, and even writing status/progress messages out to a little oled screen. https://photos.app.goo.gl/DaR7pHERsgNrGs718
So far, with the oled stuff enabled I can clock down to 4mhz and it's still fast enough that TpddTool.py doesn't time out. Haven't tried on a M100 yet. Maybe without the oled or usb serial it can even manage 2mhz. Using other code experimenting with sleep calls, I was able to get it to idle at 10ma, and wake itself up from the serial rx1 pin, then go back to sleep. In that code I was drawing only about 28ma while writing, then back down to 10-11ma. That's including the teensy providing the 3.3v to power the rs232 tranceiver. Eventually I want to make use of the teeny's built in rtc too. Should be easy enough to have the teensy recognize a special file name and feed back data from the rtc in place of a file. https://github.com/aljex/SD2TPDD/tree/bkw_teensy36 It's not working too well yet, but it's running and at least partially working. TPDD-Tool>copy TEST3.DO 0:TEST3.DO Copy successful TPDD-Tool>dir 0: TEST2 .DO 655 TEST1 .DO 12 163840 bytes free TPDD-Tool> This is awesome! (I mean, a great start) Thank you! -- bkw On Mon, Aug 20, 2018 at 4:31 PM c646581 <c646...@gmail.com> wrote: > I have a project that uses an Arduino Mega to emulate a TPDD. > > https://github.com/TangentDelta/SD2TPDD > > I have plans to eventually sell easy-to-use shields that provide the RS232 > level shifting and SD card interface. > > On Mon, Aug 20, 2018, 16:02 Brian White <bw.al...@gmail.com> wrote: > >> A tpdd emulated in low level basic hardware in line with the tpdd itself >> really appeals to me. >> >> I would love to try to make it work on a tinyduino, or maybe a gotek. >> Tinyduino may not seem "basic" being so small and modern, but it's a >> microcontroller not a PC. It doesn't run linux and systemd and bash and >> getty and python and a tcp stack and ssl and X and gnome etc etc etc. >> >> The fact that an entire pc fits in a tiny space and uses no power and >> costs $5 today thanks to the plain advancement over the passage of time, is >> sort of beside the point. Sure it's practical, but it's not *elegant*, in >> some intangible abstract mental way. >> >> You could run dlplus or laddie from an init script on an Omega2 and stuff >> the entire thing inside of a db25 connector shell, and probably even >> scavenge enough power right from the usb port with charge pumps, and the >> entire thing would be small and cheap and relatively easy to do, since it's >> just sticking a few existing things together like legos. Outwardly this >> makes all the sense in the world. But it's just such a brute-force kind of >> solution. I'd rather spend all kinds of time and effort to do the same >> thing with a controller in place of the computer. >> >> Though, you can sure get a lot more functionality out of a computer, like >> that virtual modem in mcomm. And the computer is infinitely more end-user >> hackable. It would be neat to play with hacking together some sort of >> front-end dispatcher script, kind of like inetd for serial or I guess that >> would just be an amped-up getty, maybe even with an interactive menu that >> you can access via TELCOM, and the front end runs a tpdd server or a dos >> injector or ssh client or lynx or virtual modem or something else and hooks >> it to the tty. It could stay in the loop monitoring the tty for special >> escape commands to break out into a command mode just like modems, telnet, >> ssh, cu etc all do, so you could always switch between functions from the >> M100 even after starting one. >> >> gahh ideas are sure easy to throw around :) >> >> -- bkw
