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12 MHz clk / 4 =>  3 MBd UART

time timeout 30 picocom -b 3000000 /dev/ttyUSB1 | pv > U.txt
hexdump -C U.txt

## Raspberry PI

When using RPI, the default UART (ttyS0/UART0) cannot reliably receive 3 Mbaud/s.
Instead one must switch to UART1 / ttyAMA0, by using `dtoverlay=miniuart-bt`.