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AM3352 Controlling Pins

Kartheek Gajjala
Prodigy 175 points

Other Parts Discussed in Thread: AM3352

Hi,

How can you write to pins and set pins on the AM3352 processor? For example, if I were to connect a sensor to one of the pins of the chip, how can I read from the pin? Are there AM3352 specific functions I can use to set/read pins? Where can I learn more about how to configure pins on the AM3352 processor?

Thanks

  • 0
    TI__Guru**** 161600 points

    Hi,

    In the example you gave, most likely you will use some of the most common interfaces, like i2c, spi, gpio, etc.. 

    You can find some guides on how to enable/disable & operate with these interfaces in the following wikis: 
    http://processors.wiki.ti.com/index.php/Processor_SDK_Linux_Kernel

    Also you can always use the documentation provided in linux sdk, i.e.: 

    Documentation/spi/spidev.txt

    Documentation/gpio/sysfs.txt

    Documentation/i2c/dev-interface.txt

    You can see how to configure the interfaces in the device tree from Documentation/devicetree/bindings/

    Best Regards, 

    Yordan

  • 0 in reply to Yordan Kovachev
    Prodigy 175 points

    Hi Yordan,

    I am looking at the documentation for gpio, . Once configuring the gpio interface, what are some functions to program the gpio pins now? Are there examples I can look at to start programming the chip to read data from the sensors? I am looking at the Sitara Technical Reference Manual but dont see any specific functions. I am currently using the Beagle Bone black to program the sensors and a lot of the functions to read the values are available. I am trying to do the same with just the TI chip and sensors.

    Thanks

  • 0 in reply to Kartheek Gajjala
    TI__Guru**** 161600 points
    Hi,

    Once you've configured the gpio, you can use the sysfs entries in /sys/class/gpio, see documentation here:
    www.kernel.org/.../sysfs.txt

    You need to export the corresponding gpio (echo X > export). Set its direction as input (echo input > direction) & read the value (cat value). You can also create user space api (a C program working with the files in /sys/class/gpioX/).

    Best Regards,
    Yordan