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Gate Array Learn
apt install yosys fpga-icestorm nextpnr-ice40 verilator flashrom
make
doas make load
Pulse Density Modulation
https://en.wikipedia.org/wiki/Pulse-code_modulation
https://curiouser.cheshireeng.com/2015/01/21/pdm-in-attiny85-source-code/
Raspberry Pi UART
Enable serial communication in raspi-config.
UART
stty -F /dev/ttyUSB1 1000000 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
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