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DM8148 set GPIO direction in u-boot

mike A
Genius 3490 points

Hi,

i want set some of the gpio pins as output and also set the value, should this be done before the pinmuxing in 1st stage or should it be done after pinmuxing ?

Thanks & Regards,

mike

  • 0
    TI__Guru**** 170625 points

    Mike,

    Please refer to the below links:

    http://processors.wiki.ti.com/index.php/TI81XX_PSP_GPIO_Driver_User_Guide

    http://processors.wiki.ti.com/index.php/TI81XX_PSP_User_Guide#TI814X.2FTI813X

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/383797.aspx

    Best regards,
    Pavel

  • 0 in reply to Pavel Botev
    TI__Guru**** 170625 points

    Mike,

    If you want to set the GPIO in u-boot, you can do this after pinmux and with direct programming of the GPIO registers. See DM814x TRM, chapter 10 GPIO.

    See also the below e2e treads:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/193691.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/152722.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/261383.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/146704.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/189465.aspx

    Regards,
    Pavel

  • 0 in reply to Pavel Botev
    Genius 3490 points

    Hi Pavel,

    Thanks for the response.

    For the unused pinmuxes do we need to explicitly pull down ?

    Thanks & Regards

    MIke

  • 0 in reply to mike A
    TI__Guru**** 170625 points

    Mike,

    mike A said:
    For the unused pinmuxes do we need to explicitly pull down ?

    For how to handle unused pins, refer to the DM814x datasheet, section 4.4 Handling Unused Pins

    BR
    Pavel