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1. 

   davideq
   Member

   Anyone working with these? Some come with a driver chip for the touch pad screen some don't. Some use one of the high speed serial ports (spa I2c forgot which). Is the serial solution fast enough for snappy menues. Does the touch driver really help if you have 12 bit ads available? And of course begging for code sample....
   One from solution hooks up with a 10 pin ribbon, but its setup for a .net board.

   Posted 3 years ago #
2. 

   poslathian
   LeafLabs

   Many of those screens have character sets an basic line drawing graphics built into the driver chips. For example the LCD-HUGE from sparkfun. This way for simple menu's you are not really rendering a full frame, but just sending text and position info over the serial line - in which case things are definitely fast enough.

   Many screens also have a selectable blanking so that you can draw to only a small portion of the screen at once rather than retransmit the entire frame, another great tool for menus.

   If you dont use either of these features and try and draw entire frames at a time, then you can always figure out your framerate by dividing the frame size by the transfer rate.

   You can get 1Mb/s out of the UART (serial) or the SPI on Maple without a lot of work (read - using libmaple and wirish, and not doing anything crazy on the layout).

   With some work you can go a lot faster (18Mb/s and maybe even 36Mb/s but that might require overclocking some of the peripherals).

   Posted 3 years ago #
3. 

   davideq
   Member

   I ordered a 3.2" board on ebay, its got a 16 bit bus and SD card frame. Hope I can figure it out or it's $19 wasted. It has a touch screen with chip to figure out too. I think I actually picked the wrong one, I think this one has little to no info included. Everything cones out on a dual row .1" 34 pin connector.

   Posted 3 years ago #
4. 

   ala42
   Member

   There is a download link with STM32 example code for this one, maybe you got the same: http://www.ebay.com/itm/3-2inch-320x240-Touch-LCD-A-Screen-Touch-SPI-ADS7843-LCD-SSD1289-TFT-LED-320-240-/250906574590?pt=LH_DefaultDomain_0&hash=item3a6b327efe#ht_2588wt_1126

   Posted 3 years ago #
5. 

   davideq
   Member

   Thanks!

   Posted 3 years ago #
6. 

   davideq
   Member

   I got a very similar display. The one thing I can say about there development boards is the look great. The yellow headers on the blue really pop andlook awesome. Leaf could take a peek and maybe get some make it look sexy for the new f4 versions. But that being said I will still get one if looks the same.

   Posted 3 years ago #
7. 

   crenn
   Moderator

   davideq, can you provide a link to the screen that you bought, I am curious to what one you got.

   Posted 3 years ago #
8. 

   davideq
   Member

   http://www.ebay.com/itm/180866254803?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_5890wt_914

   is the display I ordered. It should be here in 2 weeks to a month. They don't really provide any data so I don't think I would order the same one again. There was another one that was about a dollar more from another company that had full info examples I should have gotten, hind site is 20 20.

   This is the one with full data available
   http://www.ebay.com/itm/3-2-inch-TFT-LCD-Module-Display-320-x-240-with-Touch-Panel-SD-card-cage-/270954281581?pt=LH_DefaultDomain_0&hash=item3f16223a6d#ht_5763wt_876.

   When I asked the fist seller about hookup info and examples all they said was "we test before ship". I contacted the 2nd guy and he sent me the link info for that one. I'm not real comfortable ordering from China (both vendors) but I guess its done a lot these days

   Posted 3 years ago #
9. 

   davideq
   Member

   Figures, ordered 3.2" got 2.4". No data. Time to order one one from 2nd link.

   Posted 3 years ago #
10. 

    Rei Vilo
    Member

    Problem with those screens is the micro-controller does everything.

    A better solution consists on a screen with a built-in graphic controller, as the 4D Systems uLCD 32PT. So all the resources of the main controller remain available.

    It costs a little more but offers SD-card, touch, sound on top of colour LCD through one single UART serial connection.

    I've developed a library with GUI, Graphics and more.

    For documentation and training, code and examples, see http://embeddedcomputing.weebly.com/serial-lcd.html

    Posted 3 years ago #
11. 

    x893
    Member

    I use 2.8" TFT panel with touch

    http://www.aliexpress.com/product-fm/528986978-Factory-offer-best-price-with-100-quality-assurance-2-8-inch-TFT-panel-with-touch-panel-wholesalers.html

    with additional controller based on STM32F100C8. Serial interface and simplest protocol likes 4D Systems. Usually as standalone text terminal. Very cheapest and fully programmable.

    Posted 3 years ago #

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