https://github.com/jonnor/galearn

https://github.com/jonnor/galearn

Last synced: 6 months ago
JSON representation

• Host: GitHub
• URL: https://github.com/jonnor/galearn
• Owner: jonnor
• Created: 2025-04-17T20:08:00.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2025-05-02T19:11:29.000Z (about 1 year ago)
• Last Synced: 2025-05-11T08:02:20.644Z (about 1 year ago)
• Language: Verilog
• Size: 38.1 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README

Awesome Lists containing this project

README

          
Gate Array Learn

	apt install yosys fpga-icestorm nextpnr-ice40 verilator flashrom

	make

	doas make load

Raspberry Pi UART

	Enable serial communication in raspi-config.

UART

	stty -F /dev/ttyUSB1 3000000 raw cs8

	hexdump -ve '1/1 "%u\n"' /dev/ttyUSB1 | pv > pcm.txt

	pv /dev/ttyUSB1 > pcm.raw

	hexdump -ve '1/1 "%u\n"' pcm.raw > pcm.txt

	play -r 48k -e unsigned-integer -b 8 -c 1 pcm.raw

References

	Adafruit PDM Microphone Breakout

		https://learn.adafruit.com/adafruit-pdm-microphone-breakout/

	Cascaded Integrator-Comb (CIC) Filters

		https://www.dsprelated.com/showarticle/1337.php

	CIC filter in Verilog

		https://github.com/ericgineer/CIC/blob/master/CIC.v

	Pulse Density Modulation

		https://curiouser.cheshireeng.com/2015/01/21/pdm-in-attiny85-source-code/

		https://en.wikipedia.org/wiki/Pulse-code_modulation

		https://tomverbeure.github.io/2020/10/04/PDM-Microphones-and-Sigma-Delta-Conversion.html

		https://tomverbeure.github.io/2020/12/20/Design-of-a-Multi-Stage-PDM-to-PCM-Decimation-Pipeline.html

	RMS in FPGA

		https://www.controlpaths.com/2022/07/18/true-rms-compute-in-fpga/

	Verilator

		https://www.veripool.org/verilator/

		https://verilator.org/guide/latest/

	Verilog by Example (Blaine C. Raedler 2021)

		http://readler.com/books2.html

TinyTapeout submission

    There are Github Actions that build the design. GDS output most interesting

    https://tinytapeout.com/guides/workshop/create-your-gds/

    https://github.com/jonnor/ttysky25a-pdm-microphone

    tt-sky25a shuttle repo

    https://github.com/TinyTapeout/tinytapeout-sky-25a

    This seems like the correct template for sky25a submissions

    But CI builds failing as of June 20, 2025!

    https://github.com/TinyTapeout/ttsky-verilog-template

    Others have submitted using to sky25a using these older templates

    https://github.com/TinyTapeout/tt09-verilog-template

    https://github.com/TinyTapeout/tt10-verilog-template

    Examples

    https://github.com/urish/tt09-giant-ring-oscillator

    https://github.com/RVCE-ECE-Shylashree/TT10_LogAFPM-16