How to control GPIO of ARM on Zedboard

Hi Paul,

I would like to control the GPIO of ARM on my Zedboard.

I would like to set one/some GPIO to be 1 or 0.

Which function should be called in Matlab? Is there any reference doc online?

Thanks and Best Regards,

Ardeal

[Ardeal Liang]

Hi Paul,

Could you please help to answer the question?

Thanks and Best Regards,

Ardeal

Answer 1

[Paul]

There currently is no support for GPIOs on a Zedboard from the ARM.

LEDs and DIP switches are connected to the FPGA, you can assign them to an AXI-Lite port and access the data through the ARM using the HDL workflow advisor. Give a look at the following example to do that: Getting Started with Hardware-Software Co-Design Workflow for Xilinx Zynq Platform.

You can do the same using the Zynq Radio support package if you need to. The following example will help you following this workflow for an SDR application: HW/SW Co-Design Implementation of ADS-B Transmitter/Receiver Using Analog Devices AD9361/AD9364. If you mix it with the example above, you will be able to interact with the LEDs and DIP switches from the ARM.

It looks like you can also assign the Pmod connectors of the ZedBoard in step 1.3 of the HDL workflow advisor, but I have not used them. You can maybe give it a try if these are what you need.

[Ardeal Liang]

Thanks Paul! You eventually come back! Thanks! :)

as I know there are several GPIO that are connect to ARM but not FPGA.

Such as JE1 on zedboard. Could those GPIO controlled by ARM via Matlab?

Best Regards, Ardeal

[Paul]

As mentioned, we are not supporting GPIOs for the ZedBoard from the ARM.

However, you can try to use the "execute" command of the "zynq" object to send remote commands to the target from a MATLAB script.

>> help zynq

Then find how to use the GPIO you need on the board. Some documentation migt help you doing this: Using the GPIO driver from User Space

On the target, you can turn on an LED this way for example:

 zynq> echo 1 > /sys/class/leds/ld0\:red/brightness

[Ardeal Liang]

Hi Paul,

Many thanks for your reply! It is really a pity that I cannot control GPIO from Matlab remotely.

Best Regards, Ardeal