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GPIO

vineet kumar
Intellectual 730 points


Hi

presently i am working on 816x/393x spectral digital board. I am not able to identiy between the two GPIO present on the board . i have gone through the schematic diagram and datasheet . i am able to know the name of the address register but not there application. I have seen the POST in which JP2 on the daughter board is used for the general purpose input and output. but i am unable to find which bank of GPIO is interface as JP1 is only 20 PIN.

any link or documentation regarding the usage of JP2 AS GPIO and how the GPIO PIN ARE INTERFACE TO THE DAUGHTER CARD would be of great help .

PLEASE HELP ME OUT

  • 0
    TI__Guru**** 170625 points

    Hello,

    Check the following documents:

    http://support.spectrumdigital.com/boards/evm816x/reve/ - C6A816x/AM389x EVM Board schematics (PDF)

    http://support.spectrumdigital.com/boards/evm816xiodc/revc/ - DM816x/C6A816x/AM389x Expansion I/O Daughter Card schematics (PDF)

    The JP2 input/output expander is interfaced with the GPIO0 and GPIO1:

    gp0[27]

    gp0[26]

    alt_gp1[15] which correspond to gp0[29]

    alt_gp1[14] which correspond to gp0[21]

    alt_gp1[13] which correspond to spi_scs[1]

    alt_gp1[9] which correspond to gp0[23]

    gp1[12]

    gp0[24]

    BR

    Pavel

  • 0 in reply to Pavel Botev
    Intellectual 730 points

    hi Pavel

    thanks i am able to change the value on the gpio pin using sysfs entries.