Verilog on Fomu¶
“Hello world!” - Blink a LED¶
The canonical “Hello, world!” of hardware is to blink a LED. The
directory verilog/blink contains a Verilog example of a blink
project. This takes the 48 MHz clock and divides it down by a large
number so you get an on/off pattern.
Enter the verilog/blink directory and build the demo by using make:
Make sure you set the FOMU_REV value to match your hardware! See Required Hardware.
make FOMU_REV=$FOMU_REV
You can then load blink.dfu onto Fomu by using the same dfu-util -D
command we’ve been using so far. You should see a blinking pattern of
varying color on your Fomu, indicating your bitstream was successfully loaded.
Reading Input¶
There is another small example in verilog/blink-expanded which shows
how to read out some given pins. 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 your Fomu (the pins are the exposed contacts sticking out of the USB port).