MicroZed: driving LEDs using the user MIOs of PMOD

Hi,

I want to use the user MIO that are connected to the PMOD on the MicroZed board to drive the LEDs (via transistor switch) and the MOSFET driver in my PoC design. I have several questions related to both HW and SW that I would be very grateful if someone can help:
1. What is the maximum current these MIO pins can deliver?
2. How could I control them in my SW applications? Is that possible to include these MIO pins in the file system of the Linux OS?

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0 Former Member over 10 years ago

Per the Zynq data sheet ds187( http://www.xilinx.com/support/documentation/data_sheets/ds187-XC7Z010-XC7Z020-Data-Sheet.pdf ) the MIO pins can drive 8 mA. As these signals are directly connected to the Zynq device you should take care not to damage the device with electrostatic discharge or out of range voltages.

The easiest way to control the MIO under Linux is probable SysFs functions. Here are a couple of forum posts related to using SysFs:

http://zedboard.org/content/which-tutorial-linux-pl-access
http://zedboard.org/content/blink-led-linaroubuntu1110
http://zedboard.org/content/writing-gpio-linux-application-microzed

If you would prefer to write a C application under Linux and control the MIO that way there is an example in the ZedBoard Concept Tools and Techniques (CTT) tutorial that might be helpful: http://zedboard.org/support/design/1521/11

-Gary
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0 Former Member over 10 years ago in reply to Former Member

Hi Gary,

Just a quick update, as promised. Based on the information you provided, I decided to use the sysfs API and managed to be successfully flashing our LEDs with these MIO exported on the PMOD connector. Thanks for your help.
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0 Former Member over 10 years ago in reply to Former Member

Hi Gary,

Just a quick update, as promised. Based on the information you provided, I decided to use the sysfs API and managed to be successfully flashing our LEDs with these MIO exported on the PMOD connector. Thanks for your help.
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