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Will the Wince GPIO driver be able to control J18 IOEXPAND pins of AM335x EVM?

Marlon Jose Masbad
Intellectual 740 points
Other Parts Discussed in Thread: TCA6408A

We are using the TI EVM and evaluating its WinCE OS.

There is already a GPIO driver but I'm skeptical how these can control the J18 pin of the daughterboard.

Can you advise how we can drive this pins in WinCE?

BTW, I'm also wondering if there's a way for us to access the actual GPIO pins/interface by removing the daughterboard.

We tried it but the system won't boot-up.

  • 0
    Mastermind 9310 points

    Hi Marlon,

    The J18 pins aren't connected through GPIOs. They are connected to two TCA6408A chips (http://www.ti.com/product/tca6408a) which are controlled using I2C clock and data lines from the baseboard. These lines on the baseboard are "AM335X_SPI0_CS0" and "AM335X_SPI0_D1" muxed as "I2C1_SCL" and "I2C1_SDA" respectively.

    You can use the I2C functions to read and toggle the J18 pins by writing to the resisters of the TCA6408A chips.

    Regards,