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Choosing L137, L138

Serdar55108
Prodigy 280 points

Hi,

I am trying to choose L138 or L137 for a customer project.

Project requirements:

- They have 800x480 LCD display and medium level Qt GUI. A few button, a few chart and menu structure.

- Ethernet communication with server.

- L137 + SDRAM + SPI Flash (????) or L138 + DDR2 + Nand Flash

- ADC for data acquisition (SPI, 250k), and DSP for signal processing.

 

First question is L137 + SDRAM + Nand Flash + LCD possible? and how, if it is possible?

Second question is I think L137 or L138 LCD controller can drive 800x480 but how much effective? Especially for L137 with SDRAM?

 

Thanks

Serdar

 

  • 0
    TI__Mastermind 44306 points

    Serdar,

    some comments on the display and therefor the LCD controllers. I remember there was a web page detailing the specifics and achievable resolutions but I didn't save it. So search the wiki and the forums.

    Generally the L138 has a larger FIFO in the LCDC. In our tests L137 was limited to 640x480 but L138 could go higher. But at 800x600 you might get problems depending on the general load on the DDR interface (application dependent!). I have never tried 800x480.

    By the way these comments are for Linux and WinCE might behave differently.

    Regards.

  • 0 in reply to Frank Walzer
    TI__Prodigy 280 points

    Hi,

    Thanks Frank. My customer will use linux.

    Do you have any comment using LCD and Nand with L137? L137 Evm has 4MB SPI flash and I think it is not enough to Qt libs included file system.

     

    Regards

  • 0 in reply to Serdar55108
    TI__Mastermind 44306 points

    Serdar,

    we only did one project on the L137 EVM before we got the L138... This was using Qt with VGA display but we used SDCard for the filesys.So no memory issues. Usually Qt is way above 4MB if you build and install all libs. It can be configured down drastically for embedded apps I think, but we never tried the minimum for apps with just a few widgets.

    Still a challenge as the kernel alone is normally ~2MB.

    But for development purposes I would prefer SDcard or even NFS filesys anyway for flexibility. Later the customer hardware will have a different memory config anyway, right? I have no experience with L137 and NAND, so can't comment on that.

    Regards.

  • 0 in reply to Serdar55108
    TI__Mastermind 27585 points

    Yes NAND and LCD can be used simultaneously. However, only 8-bit NANDs would work, as the upper data byte is used by the LCD controller.

    Jeff