Working with DM6467T GPIOs with git linux

Sushant Mayekar

Hi,

We intend to use GPIOs 4,5,36 and 38 on dm6467T over git linux v2.6.32. We are using

gpio_request(gpioOut, NULL);
gpio_direction_output(gpioOut , 1);

        while(!(__gpio_get_value(gpioIn)));
        gpio_set_value(gpioOut, 0);
        msleep(800);
        gpio_set_value(gpioOut, 1);

Here gpioIn can be GPIO-04 or GPIO-05 and gpioOut is GPIO-36 or GPIO-38 on DM6467T .

We are only able to read GPIO-04 and GPIO-05 levels correctly but we are uable to set the levels on GPIO-36 and GPIO-38.

Please let me know if GPIO initializations are taking place correctly in GIT linux 2.6.32. Any pointers or references in how we can set the GPIO levels under git.

Regards

over 14 years ago

0 Sudhakar Rajashekhara over 14 years ago

TI__Expert 5170 points

Hi,

GPIO-36 and GPIO-38 pins are muxed with Transport Stream Interface module. Have you taken care of configuring the Pinmux registers such that these pins are indeed GPIO?

Regards, Sudhakar

0 Helmut Forren over 14 years ago in reply to Sudhakar Rajashekhara

Mastermind 6805 points

Where's first base on gpio access?

For example, what #include do I need for gpio_request to be defined?

Can I do this from my application, derived from the encodedecode demo?

I find the DM6467T EVM has GPIO connections to BOTH the DaVinci chip and the CPLD. Which connection is being used by gpio_request() and related functions?

MOST OF ALL, is there any doc somewhere on gpio_request et al.? I haven't been able to find it.

relates to: http://e2e.ti.com/support/embedded/f/354/p/102216/358990.aspx#358990

Thanks very much,

Helmut

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Working with DM6467T GPIOs with git linux