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Project 2.2 Frequency counter

Home Page: https://zerotoasiccourse.com

License: Apache License 2.0

Makefile 20.24% Python 38.50% Verilog 41.26%

asic hdl verilog

frequency_counter's Introduction

Frequency counter

This repository is a template for project 2.2 that takes you through:

Building an edge detector
Building a seven segment driver
Counting edges
State machines

License

This repo is part of the Zero to ASIC course and licensed with Apache 2.

Resources

Verilog cheatsheet: https://marceluda.github.io/rp_dummy/EEOF2018/Verilog_Cheat_Sheet.pdf
Clock domain crossing: http://www.sunburst-design.com/papers/CummingsSNUG2008Boston_CDC.pdf
Flip flops and metastability: https://www.youtube.com/watch?v=5PRuPVIjEcs
VHDL resources: https://docs.google.com/document/d/1RAQWjmxpJndlEJdLWXK8irIqWuYTstqu7pU3tOIFccc/edit
Charles Eric LaForest design elements guide: http://fpgacpu.ca/fpga/index.html

frequency_counter's People

Contributors

Stargazers

Watchers

Forkers

tommythorn wero1414 chaseadam hansemro sfmth dsplover algofoogle stephen-riley

frequency_counter's Issues

Assertion side effect in test when NOASSERT=1 is used

I'll submit a PR for this shortly, but this is just a long write-up for a very short change :)

An intended use of NOASSERT=1 with the various make test_* tests is to capture VCD waveforms of the design so far, even though it might not yet be passing the formal tests. These waveforms help with learning and debugging. When using NOASSERT=1 in this project, an unintended side effect emerges. An otherwise required state-advancing call to read_segments gets masked out here:

frequency_counter/test/test_seven_segment.py

Line 53 in c348479

assert await read_segments(dut) == tens * 10 + units

...and here:

frequency_counter/test/test_frequency_counter.py

Line 52 in c348479

assert await read_segments(dut) == input_freq

This alters the internal timing of the test, and corrupts the waveform data. For example, this is a valid result with assertions being executed:

make test_seven_segment && make show_seven_segment

...while the result is corrupted when using NOASSERT=1:

NOASSERT=1 make test_seven_segment && make show_seven_segment

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