LM3S9B96 evaluation board comes with a 320 x 240 (QVGA resolution) LCD display. Can the processor support higher resolution displays, SVGA (800 x 600) or XGA (1024 x 768) or WXGA (1024 x 720) ??
Venkat RamananCan the processor support higher resolution displays
Not likely - in fact doubtful that the uC can support even lowly QVGA @ 16-24 bpp @ 30+ Hz. Suspect that the display on Eval board has "in-built" data-bus lcd controller. SSD1963 has "won many sockets" for control of normal Lcds & TFTs - up to 800x480 pixel resolution. Features both an 8 bit and 16 bit data bus (plus adr & strobes) for interface to your MCU. Beyond this you can consider FPGA + screen buffer or ARM MCU w/advanced TFT Controller in-built. (on our Stellaris wish-list)
If you can find a higher resolution panel with an integrated frame buffer and display controller then you should be able to attach it to a 9B96 assuming it has an interface that is compatible with the EPI or some other 9B96 communication peripheral. Although we don't ship anything higher resolution than QVGA, I have a Kentec K90DWN2 800x480 panel sitting on my desk that should work (I just haven't found the time to play with it yet!).
You are unlikely to be able to use a display of this size for video-like refresh rates from a Stellaris but it should be adequate for low refresh, HMI applications, I expect (with apologies to CB1 for contradicting him again!).
[Edit: It looks like I'm actually agreeing with CB1 after all. This display has an SSD1963 controller and integrated frame buffer.]
For those interested - here's the basis for my suggestion of "stand-alone" Lcd Controller: Recall - poster specifically asked, "Can the processor support higher resolution displays?" This strongly suggests that he/she seeks to employ the MCU as "display controller" - despite protest I stand by my earlier recital... (No - not a good idea) Here's why:
For QVGA TFT - 320 * 240 = 76,800 pixels. If we allow 16 bpp the required display "Frame Buffer" is 153,600 bytes. At 24 bpp - 230,400 bytes. Both far exceed the SRAM capacity of any Stellaris. Strike ONE.
To realize such a design w/Stellaris doing this repetitive "grunt-work" - every single SRAM byte must be read at a minimum of 30 Hz - many displays will require higher rates to preclude flicker. As no Stellaris has this capacity - one is forced to use physically larger (and more expensive) external bus MCUs. And then procure, place & connect the necessary SRAM. (makes great sense - huh?) Strike TWO.
This rather large (by MCU standards) SRAM must be constantly read - sent to the display - and optionally written when the screen image is changed. While this "might" be w/in the capability of a Stellaris (or other - similar ARM MCU) it is far from their "Sweet Spot" - and a particularly poor use of the wondrous MCU resource. And - to be kind to Dave W. - we haven't even "touched" on the issue of Frame Buffer read-write contention during screen updates... Strike THREE.
Long live Stellaris - for applications which are truly "MCU appropriate" - which is NOT direct TFT display control! Huge numbers of Lcd & TFT controllers exist just for these reasons - looking outside the "MCU Prism" may be justification for non corporate posters to present their opinions - especially when experience, logic, and a broader perspective aids insight!... Again - this is not a "knock" upon Stellaris - just a serious mismatch of application.
I'd provide my own, "green tick" (as opposed to the earlier "ticked" TI response) but rely on the fairness of others for such reward... BTW - SSD1963 includes an enormous, internal Frame Buffer - yielding unmatchable cost, size & use benefits...
Well put - I am 100% in agreement with you here.
@Dave - Thank you - sometimes even blind squirrel stumbles across a walnut! (5+ years Engineering school + UCLA Law + founding/taking display firm public not all for naught) Sometimes (often) the business case for a competing solution must be examined - SSD1963 is over-whelming winner here...
That said - the support you've provided me, hundreds (thousands) of others wrt famed "Stellaris Graphic library" deserves mention/emphasis. While current Stellaris may not be "stand-alone" suitable for direct drive/control of large graphic displays - the Stellaris Graphic Library surely is! As Dave has often said - much easier to "tweak" the Display Driver software so that most any display can operate in conjunction with the Stellaris Graphic Library.
@cb_1 & @Dave Thanks for your Reply. We have started looking for other options for the display controller.
@cb_1: From what you have written here, i unerstand that the Stellaris Graphics Library can be used, with some tweaks, on other platfroms also. (C6000 or AM17x). Is that right?
@Venkat: While I have some ideas in this regard (Stellaris Graphics Lib extension) - this really is Dave's area and I defer... (BTW - thanks for your green tick - appreciation is always welcome)
The StellarisWare license agreement allows you to use any of the code on any TI device. I know that the Sitara (AM17x) people ship a port of our graphics library with their software but I don't know about C6000. That said, there's nothing that's particularly tied to the Stellaris hardware in grlib so I would imagine that porting it yourself wouldn't be too tricky if there isn't a port already provided.
Thanks Dave and cb1 for your replies..
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.