Pulse Width Modulation
~~~~~~~~~~~~~~~~~~~~~~~~~~
This example is built specificity for the arty_35T. It demonstrates a greater variety of I/O and
a PWM that drives the RGB leds on the board. To build this example run the following
commands:
.. code-block:: bash
:name: example-pulse-arty-35t
make -C pulse_width_led
At completion, the bitstreams are located in the build directory:
.. code-block:: bash
cd pulse_width_led/build/arty_35
Now, you can upload the design with:
.. code-block:: bash
openocd -f ${INSTALL_DIR}/${FPGA_FAM}/conda/envs/${FPGA_FAM}/share/openocd/scripts/board/digilent_arty.cfg -c "init; pld load 0 top.bit; exit"
After downloading the bitstream, you can experiment with and mix different amounts of red, green, and
blue on RGB led 0 by toggling different switches and buttons on and off. From left to right:
switches 3, 2, 1 control the intensity of blue, switch 0 and buttons 3 and 2 control the intensity of
red, and buttons 1 and 0 control the intensity of green. The following provides an example:
.. image:: ../../docs/images/pwm.gif
:align: center
:width: 50%
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