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Last Post 04 Oct 2018 01:33 PM by  SuperSlacker
C6748 Boot from Rev C SOM
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SuperSlacker
New Member
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Posts:3


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03 Oct 2018 03:55 PM

    Hello,

    I'm currently using a Zoom OmapL138 experimenter from LogicPD and have run into an issue burning code to the chip.  I've followed the steps outlined in the application note "AN523 Creating Standalone Sample Application" at https://support.logicpd.com/Product...aspx 

    Burning a C6748 only SOM (LogicPD Rev A) with the led blink code seems to work just fine using Aisgen 1.9 when setting the device type to d800k006 DSP to create config.cfg file then running the command line: 

    C:\c6748\http://www.ti.com/product/OMAP-L138" target="_blank" title="Link to Product Folder">OMAP-L138_FlashAndBootUtils_2_31\http://www.ti.com/product/OMAP-L138" target="_blank" title="Link to Product Folder">OMAP-L138\GNU\sfh_omap-l138.exe -targetType C6748 -p COM3 -flash_noubl config.bin

    This code blinks the LED's just fine.



    When I switch over to the L138/C6748 SOM (LogicPD Rev C) with the same led blink code I use device type d800k008 DSP because I want to use only the C6748 portion of the SOM, ignoring the L138 ARM. I then 

    burn the chip using the command line:

    C:\c6748\http://www.ti.com/product/OMAP-L138" target="_blank" title="Link to Product Folder">OMAP-L138_FlashAndBootUtils_2_31\http://www.ti.com/product/OMAP-L138" target="_blank" title="Link to Product Folder">OMAP-L138\GNU\sfh_omap-l138.exe -p COM3 -flash_noubl config.bin

    The LED's do not blink.



    I'm guessing that I need to do something to put the ARM into reset but I can't find documentation to do that. Could you point me in the right direction? Maybe some example code that will use the the C6748 portion 

    of a L138/C6748 SOM to blink LED's?

    Adam Ford
    Advanced Member
    Advanced Member
    Posts:756


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    04 Oct 2018 08:14 AM
    I would start with this App Note: https://support.logicpd.com/Desktop...ntryId=745

    It's called AN 422 Accessing the DSP on the OMAP-L138 SOM-M1. The default processor is the ARM, so you have to enable the DSP.

    The software packages for the OMAP-L138 EVM were developed by TI and the hardware was developed by Logic PD, so most of the software How-To guides are on TI's support site, but we have some examples on our support site as well.

    http://processors.wiki.ti.com/index...sign_Guide

    adam
    SuperSlacker
    New Member
    New Member
    Posts:3


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    04 Oct 2018 01:33 PM

    Thanks for the help.  Since the device boots from the ARM, ARM code must be written to switch over to the DSP.  Makes sense.  It's working fine now.

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