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Using the #29121 Display — Parallax Forums

Using the #29121 Display

davttaylordavttaylor Posts: 2
edited 2006-07-05 18:42 in General Discussion
I have found the Javelin stamp to do what ever the documentation outlined it to do up till I decided to use a digital gain control. To make the didgital gain contol practical I needed to see where it was set at. So I decided to play with the different displays. The first I tried was the 29121 LCD device with the four bottons. The problem I have run into is that I'm using a USB connection to talk to the javelin bug and it give me an error KNK-2000 when I try and talk to it with the sample software. The software compiles and seems like it should work but I cannot transfer it to the Javelin Chip. What majic thing have I missed or will it only work serial feed.?

Comments

  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2006-06-30 21:21
    What LCD is that (url please).
    There is a problem with the usb version of the BOE in that the javelin ide port
    cannot be used to read in data from the pc. However, downloading programs
    is not a problem.
    Please be more specific about what is not possible, hardware setup, program listing etc.

    regards peter
  • davttaylordavttaylor Posts: 2
    edited 2006-07-05 17:40
    Peter Verkaik,

    Thank you for your response! I have not had a problem downloading data from the pc to the javalin stamp, that is programs that I have written. They compile and down load to the stamp fine and do for the most part what I want. I needed to add a display ie the LCD device. I have the eduction board with the usb port and the javalin stamp for test purpose. I have coupled most of my other electronics to this and have been succesful up now. I gather from the limited data that I could plug the LCD Terminal AppMod #29121 into the eduction board and download the demonstration software for the Javalin Stamp from Parallax and see how it worked.
    When I have tried this I get two problems (1) the program cannot find the LCD device (2) I get a transfer error with an error code that I can find no reference for.
    I have thought about bypassing the usb in-put on the education board and wire the stamp to conect to the pc by a serial port instead, but thought this was perhaps a better path to follow. So that delema. David Taylor
  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2006-07-05 18:42
    David,

    That lcd requires pin1 to pin7 to operate.
    If your board has an appmod header you can connect the lcd,
    but no other electronics must be connected to javelin I/O pins 1 to 7.
    So if your current setup uses any of the pins 1 to 7,
    disconnect any circuitry from those pins before connecting the lcd.

    regards peter
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