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72 lines
2.4 KiB
ReStructuredText
72 lines
2.4 KiB
ReStructuredText
.. _HDLs:Verilog:
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Verilog on Fomu
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---------------
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“Hello world!” - Blink a LED
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The canonical “Hello, world!” of hardware is to blink a LED.
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The directory :repo:`hdl/verilog/blink <hdl/verilog/blink>` contains a Verilog example of a blink project.
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This takes the 48 MHz clock and divides it down by a large number so you get an on/off pattern.
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Enter the :repo:`hdl/verilog/blink <hdl/verilog/blink>` directory and build the demo by using ``make``:
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**Make sure you set the** ``FOMU_REV`` **value to match your hardware!** See :ref:`required-hardware`.
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.. session:: shell-session
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$ make FOMU_REV=$FOMU_REV
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...
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Info: Max frequency for clock 'clk': 73.26 MHz (PASS at 12.00 MHz)
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Info: Max delay posedge clk -> <async>: 3.15 ns
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Info: Slack histogram:
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Info: legend: * represents 1 endpoint(s)
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Info: + represents [1,1) endpoint(s)
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Info: [ 69683, 70208) |**
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Info: [ 70208, 70733) |
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Info: [ 70733, 71258) |**
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Info: [ 71258, 71783) |**
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Info: [ 71783, 72308) |**
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Info: [ 72308, 72833) |**
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Info: [ 72833, 73358) |
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Info: [ 73358, 73883) |**
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Info: [ 73883, 74408) |*
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Info: [ 74408, 74933) |**
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Info: [ 74933, 75458) |**
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Info: [ 75458, 75983) |*
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Info: [ 75983, 76508) |*
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Info: [ 76508, 77033) |**
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Info: [ 77033, 77558) |**
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Info: [ 77558, 78083) |*
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Info: [ 78083, 78608) |
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Info: [ 78608, 79133) |*************************
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Info: [ 79133, 79658) |**
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Info: [ 79658, 80183) |***
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22 warnings, 0 errors
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icepack blink.asc blink.bit
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cp blink.bit blink.dfu
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dfu-suffix -v 1209 -p 70b1 -a blink.dfu
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dfu-suffix (dfu-util) 0.9
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Copyright 2011-2012 Stefan Schmidt, 2013-2014 Tormod Volden
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This program is Free Software and has ABSOLUTELY NO WARRANTY
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Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
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Suffix successfully added to file
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$
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You can then load ``blink.dfu`` onto Fomu by using the same ``dfu-util -D`` command we’ve been using so far.
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You should see a blinking pattern of varying color on your Fomu, indicating your bitstream was successfully loaded.
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Reading Input
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^^^^^^^^^^^^^
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There is another small example in :repo:`hdl/verilog/blink-expanded <hdl/verilog/blink-expanded>` which shows how to read
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out some given pins.
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Build and flash it like described above and see if you can enable the blue and red LED by shorting pins 1+2 or 3+4 on
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your Fomu (the pins are the exposed contacts sticking out of the USB port).
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