GitLab

For the first simple labs the simulator seems to be useless
because the function is so simple.

with this change the sdc file target can be overwritten in the
project specific makefile.

The original design of the audio echo example runs with 8 kHz
sampling frequency for longer echo time. I changed this to 48 kHz
sampling frequency. Changed the system clock from 24 MHz to 50 MHz
to have default timing constraints.

Based on the echo example I build an audio interface which provides
the audio interface with parallel data.

pnr/de1_mux2to1/de1_mux2to1_pins.qsf
pnr/de1_binto7segment/de1_binto7segment_pin.qsf

as a format for importing pin assignments manually

pnr/de1_mux2to1/de1_mux2to1.qpf
pnr/de1_mux2to1/de1_mux2to1.qsf

and design files
pnr/de1_binto7segment/de1_binto7segment.qpf
pnr/de1_binto7segment/de1_binto7segment.qsf

create_quartus_project_settings.tcl

necessary changes in pnr/makefile and sim/makefile

- added file scripts/design_project_directory_structure.txt
- added credentials for Friedrich Beckmann in header blocks
- added appropriate comments to understand makefiles
- moved testbenches and test environment source files to src dir