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Reprogramming OMAP-L138 SOM I/O

Maximus4
Prodigy 130 points
Other Parts Discussed in Thread: OMAP-L138

 

I've been developing a product using the LogicPD eXperimenter board and the OMAP-L138 SOM.  It's time to move from the eXperimenter board to the prototype hardware, but I need to reprogram some of the I/O from the defaults used on the SOM module.  Is there a test fixture that just powers up the SOM module without anything connected to it but the JTAG to do this?  I'm concerned I may have some pin conflicts if I attempt to do this on the eXperimenter board or the new hardware. 

  • 0
    TI__Mastermind 27585 points

    No I'm not aware of any such test fixture. Which pins are you concerned may have conflicts?

    Jeff

  • 0 in reply to jc-ti
    Prodigy 130 points

     

    Jeff,

    Thanks for the reply.  I'm initially concerned with configuring the OMAP-L138 SOM to use UART1, where the SOM uses some of the lines (TxD and RxD) in the SPI1 configuration.  According to the SOM-M1 Hardware Reference, J1-95 is an output, SPI1_SCS[3] and we want to configre it as UART1_RXD.  I'm concerned this may conflict with our hardware driving RxD.  However, I don't expect either output to be driving on power up.

    Max

     

     

     

  • 0 in reply to Maximus4
    TI__Mastermind 27585 points

    Looking at the SOM schematic, there is nothing on the SOM that is actively driving that pin. As long as you configure that pin on the OMAP-L138 to use the UART1 pinmuxing, there shouldn't be an issue.

    Any pins that pass straight though on the SOM from the OMAP-L138 to a connector will not have any inherent conflicts with your board.

    Jeff

  • 0 in reply to jc-ti
    TI__Mastermind 27585 points

    Also you might be concerned that the ROM boot loader will set this pin as an output during SPI1 boot. I checked the ROM code and only the following signals are used during SPI1 boot:

    SPI1_SCS[0]
    SPI1_CLK
    SPI1_SIMO
    SPI1_SOMI

    Jeff