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GPIO leds pin not changeable

cascade99

Hi, I followed "The Zynq Book Tutorials for Zybo and Zedboard" to create gpio_leds and gpio_btns,

download image to zedboard, I'm using petalinux/vivado 2015.2, I saw there were two gpiochip 902

and gpiochip 906, I did:

echo 902 > export

echo out > direction

echo 1 > value

I tried on both 902 and 906, the leds didn't turn on and off.

I created axi_gpio_1 which offset is 0x41210000, but after petalinux boot up, only 0x41200000 showing, axi_gpio_1 was not created.

Anybody knows why and how to debug this?

From design_pl_bd.tcl:

# Create address segments
create_bd_addr_seg -range 0x10000 -offset 0x41210000 [get_bd_addr_spaces processing_system7_0/Data] [get_bd_addr_segs axi_gpio_1/S_AXI/Reg] SEG_axi_gpio_1_Reg

 

From uart console:

only shows label: /amba/pl/gpio@41200000

 

Thanks

  • 0

    Try going through the PetaLinux for Zynq tutorial in the Training and Videos section of this website.  Sounds like you may have one of the following issues:

    1. The Vivado project did not properly specifiy the parameters for your new hardware IP.

    2. Your device tree does not match the hardware components that you added.

    3. Your device tree does not correctly link the appropriate Linux driver to your new hardware.

    If you follow the tutorial, you should have success with accessing the board components, then you can see where you might have gone wrong with your current application.

    Ron