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Re: FT800 bindings in ANS Forth

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On 2/11/2015 4:07 AM, Raimond Dragomir wrote:
>>
>> I suppose if you had an existing system with a code base and you needed
>> to add graphics but didn't want to update the CPU this chip might have
>> some advantage.  Otherwise, why not just pick the right CPU for the job?
>>
> You mix things here, updating a CPU has nothing to do with SBCs like rPi or BBB.

I'm not talking about updating a chip.  I'm talking about a design that 
is in place and you don't want to toss out your code and start over with 
a different system.

So you are making my case for me.

> Also, a real custom made FT800 board is hardly more than $10 for a given QVGA or WQVGA tft screen.
> Let me give you a real world example: I have a board with an ATmega1280 microcontroller (AVR8). Besides many other things it does, it has a connection with a monochrome (but graphic) lcd screen 128x128 pixels. The firmware is quite elaborate, and has been developed and updated during almost 5 years.
> Now, the client is asking of an improvement: he wants to change the lcd and the membrane keyboard of the device with a single color tft with touchscreen. What should you do? Put a beaglebone inside? or rPI? Begin programming in Linux?
> There are two solutions: change the board completely, with a new chip and an external SRAM or SDRAM, let say a LPC4000 series. These chips have an internal lcd controller, but they need external ram for it. Also, the touch screen support is not there, you need at least an "emulated" one by two analog pins and two digitals, and a firmware driver based on lot of interrupts. Or an external TS controller chip... And all of this will not free you of needing an aditional board for the TFT screen itself, containg at least the connectors and maybe some power supplies.
> The second solution is a tft board with the FT800. This will almost have no impact on the current base board, except maybe changing the connectors. Also, the firmware will only have to be modified for the graphics, and that will be also more easy to do because the FT chip already has the primitives inside...
> And I'm not talking about any audio output, because the application doesn't need any.
>
> My only complaint about the FT800 is that it is limited to 480 x 272 resolution. I have applications with 800 x 480 which are impossible with FT800. I do them with LPC4000 chips, but only the graphics eats almost 50% of the cpu processing time, at 120MHz, most of the time. I whish I could have a FT800 for those applications...
>


-- 

Rick

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FT800 bindings in ANS Forth James Bowman <bowmanator@gmail.com> - 2015-02-09 17:43 -0800
  Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-09 21:59 -0500
    Re: FT800 bindings in ANS Forth James Bowman <bowmanator@gmail.com> - 2015-02-09 20:00 -0800
      Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-10 13:36 -0500
        Re: FT800 bindings in ANS Forth visualforth@rocketmail.com - 2015-02-10 13:47 -0800
          Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-10 17:03 -0500
            Re: FT800 bindings in ANS Forth visualforth@rocketmail.com - 2015-02-10 14:22 -0800
              Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-10 21:34 -0500
                Re: FT800 bindings in ANS Forth Raimond Dragomir <raimond.dragomir@gmail.com> - 2015-02-11 01:07 -0800
                Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-11 11:26 -0500
              Re: FT800 bindings in ANS Forth hughaguilar96@gmail.com - 2015-02-10 19:44 -0800
                Re: FT800 bindings in ANS Forth hughaguilar96@gmail.com - 2015-02-10 22:29 -0800
                Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-11 11:29 -0500
                Re: FT800 bindings in ANS Forth Mark Wills <markwills1970@gmail.com> - 2015-02-11 11:19 -0800
                Re: FT800 bindings in ANS Forth rickman <gnuarm@gmail.com> - 2015-02-12 03:28 -0500
                Re: FT800 bindings in ANS Forth hughaguilar96@gmail.com - 2015-02-11 21:34 -0800
  Re: FT800 bindings in ANS Forth Matthias Koch <matthias.koch@hot.uni-hannover.de> - 2015-02-16 12:07 +0100
    Re: FT800 bindings in ANS Forth Mark Wills <markwills1970@gmail.com> - 2015-02-16 03:12 -0800

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