crazybydefault / vhdl

Agents of Chaos' Embedded Programming project for EE1150

Agents of Chaos' Embedded Programming project.

Running the code

The makefile has the following recipes -

all - Compiles all the required files
run - Runs the compiled files
with-gtkwave - Compiles and runs the files, as well as creates the GTKWave file
clean - Cleans up the .o, .cf and executable files from the directory

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The team is -

• EE16BTECH11026 - Aravind Ganesh
• ES16BTECH11005 - Jeel Bhavsar
• ES16BTECH11012 - Akshita Ramya
• ES16BTECH11025 - V. V. Shashank
• ES16BTECH11029 - Srinidhi Bachu

Here's how you build GHDL for Ubuntu, in case you haven't already -

We're gonna be building ghdl with a gcc backend. This will take slightly more disk-space (not by much) and a little longer to download the files for, but gcc should be the fastest backend for ghdl. Here we go -

0. Install an ada compiler (you may already have this, run the command anyway) -
   sudo apt-get install gnat

1. Acquire gcc source-code. The download is the time taking part.
   wget ftp://ftp.gnu.org/gnu/gcc/gcc-4.9.4/gcc-4.9.4.tar.bz2

2. After downlaoding the tar.gz archive of the source code, extract it
   tar xvjf gcc-4.9.4.tar.bz2

3. Add the directory of your gcc source code to a local variable -
   gccsource=$(pwd)/gcc-4.9.4/

4. Download certain prerequisites for gcc -
   (cd $gccsource; ./contrib/download_prerequisites)

5. After that's done, download ghdl source code -
   git clone https://github.com/tgingold/ghdl.git

6. Go into the directory where you downloaded ghdl -
   cd ghdl

7. Configure ghdl with the right parameters before install -
   ./configure --with-gcc=$gccsource --prefix=/usr/local

8. Finally, install ghdl -

   make
   sudo make install
   

9. Yayy! You're done! After you're done, you can get rid of the gcc and ghdl source code you downloaded -

   cd ..
   sudo rm -R ghdl
   sudo rm -R gcc-4.9.4
   

Now, you can use ghdl normally as a terminal command to compile and run vhdl files! :D

This is how to compile and run a vhdl file

Write a vhdl code in a text file and save it with .vhdl file extension.

In the directory run this command export PATH=/opt/ghdl-updates/bin/:$PATH

Run the following command to compile the file ghdl -a file_name.vhdl

Then you have to build excutable file (-e means elaborate) ghdl -e entity_name

An executable file entity_name is generated. To run the file excute the following command ghdl -r entity_name

GTKWave

To install GTKWave, run the following in the terminal sudo apt-get install gtkwave

Follow this step while running the executable file to create waveform file (VCD format) ghdl -r excutable_file --vcd=file_name.vcd

To view the .vcd file, gtkwave file_name.vcd