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https://github.com/chipsalliance/f4pga-examples.git
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47 lines
1.6 KiB
ReStructuredText
47 lines
1.6 KiB
ReStructuredText
Serial Transmitter
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~~~~~~~~~~~~~~~~~~~
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This design demonstrates a UART transmitter on the basys3 board. ASKII values can be sent over USB to a
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putty terminal. To build the design first navigate to the additional_examples directory:
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.. code-block:: bash
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:name: additional-example
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cd additional_examples
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Then run make to compile the design:
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.. code-block:: bash
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:name: example-uarttx-basys3
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make -C uart_transmitter
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At completion, the bitstream is located in the build directory:
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.. code-block:: bash
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:name: uarttx-build
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cd uart_transmitter/build/basys3
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Now, you can upload the design with:
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.. code-block:: bash
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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"
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Once the code has been downloaded to the board open a Putty terminal and choose the correct serial
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connection line for your board from the list of options. Set the baud rate to 19200, data bits to 8, stop
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bits to 1, the parity to ODD, and the flow control to NONE. You can change these properties by looking under
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the serial settings on the left hand side of Putty.
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After configuring Putty, open a session and use the switches on the basys to chose an
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`ASKII <https://www.asciitable.com/>`_ character to send over UART. The value of the character will be
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displayed on the seven segment display in hexadecimal and you can send the character over UART by pressing
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the center button. The following is an example of the transmitter:
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.. image:: ../images/uart_tx.gif
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:align: center
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:width: 50%
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