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Propeller and VGA don´t work — Parallax Forums

Propeller and VGA don´t work

romanocontangaromanocontanga Posts: 3
edited 2014-03-24 10:25 in General Discussion
Hello, good morning:

I have a TFT with VGA connection, connect the propeller with the adapter and program my P8X32A, the screen starts, and after a few seconds turns off and stops working, the screen turns off and then not work until I turn off the P8X32A or reset, the question is that I connect the VGA computer monitor and it works perfectly with absolutely no interruption. The chip that runs the TFT is the RTD2660.
Someone has something happened?
Any idea?
Thank you.

That is the TFT:

http://www.ebay.com/itm/LCD-Controller-for-5-7-TFT-LCD-Module-with-2-AV-VGA-Board-800-x-480Dots-40Pin-/170751974412?pt=LH_DefaultDomain_0&hash=item27c19c5c0c
http://www.ebay.com/itm/5-5-0-inch-TFT-LCD-Display-Module-w-VGA-AV-Video-Driving-Board-Touch-Panel-/291020314714?pt=LH_DefaultDomain_0&hash=item43c229985a

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2014-03-24 09:23
    Welcome to the forums!

    Is it just using an unsupported scan rate for your display? Do any of the other VGA demos run with this display? Some use different resolutions at a given scan rate. I have seem some displays that don't support a specific resolution at a certain rate.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-03-24 09:30
    This may or may not help. But simply put, not all VGA devices are of equal quality when booting up. Some seem to be very stable and others seem to get lost and refuse to boot.

    I have 3 VGA monitors from different sources and all behave differently. Could it be that the TFT device is just a problem device?

    Some of brands of VGA are notorious for poor firmware.
  • PropGuy2PropGuy2 Posts: 360
    edited 2014-03-24 09:41
    If you re using the Prop Project Board USB (32810 rev.B) you have an interference problem with the HS & VS lines. You have to drill out the X1 trace on the PCB. See earlier posts on how to do this.
  • romanocontangaromanocontanga Posts: 3
    edited 2014-03-24 10:01
    Hi I've had, first of all thanks for your posts, other schedules VGA and does the same with everyone, I've tried also to write to the EEPROM for later disconnect the recorder usb (working with proto-board) and is doing the same.
    What is more strange to me that the VGA computer work without any problem. I have no idea that it can happen, as I ke buy the developer to put him back to drivers RTD2660.
  • Bob Lawrence (VE1RLL)Bob Lawrence (VE1RLL) Posts: 1,720
    edited 2014-03-24 10:06
    You'll have to find or design a driver to work with your LCD chip-set (RTD2660) and at a resolution for your 5.0 screen. @ 480 * 272

    Have a look at ray's logic to see examples of interfacing to various LCD screens. hopefully that will give you some ideas.

    http://www.rayslogic.com/Propeller/Products/PTP2/PTP2.htm
  • PublisonPublison Posts: 12,366
    edited 2014-03-24 10:21
    romanocontanga wrote: »
    Hi I've had, first of all thanks for your posts, other schedules VGA and does the same with everyone, I've tried also to write to the EEPROM for later disconnect the recorder usb (working with proto-board) and is doing the same.
    What is more strange to me that the VGA computer work without any problem. I have no idea that it can happen, as I ke buy the developer to put him back to drivers RTD2660.

    Not sure if this will fix the issue, but this is the thread PropGuy2 was reffering to:

    http://forums.parallax.com/showthread.php/146944-Propeller-Project-Board-USB-VGA-issues/page2
  • romanocontangaromanocontanga Posts: 3
    edited 2014-03-24 10:25
    ok, thank you all, I found a VGA does not turn off, michisimas thanks for your ideas, and work, Bob Lawrence (VE1RLL) was right.
    Thank you.
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