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vesper/doc/rpi3_serial.md

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Connecting RPi3 UART

Using cp2104 usb-to-ttl converter

Download drivers from SiLabs driver page.

Install minicom: brew install minicom

Configure minicom to use /dev/tty.SLAB_USBtoUART port. On macOS Big Sur it might be /dev/tty.usbserial-019586E3 or similar depending on the serial number of the adapter.

Connect RPi wires to cp2014:

NB: Swap the TXD and RXD wires. I.e. RXD pin of CP2104 should go to TXD pin on RPi and vice versa.

UART0

RPi Func  |  RPi GPIO  |  PIN #  |  MODE  | CP2104 Pin | Wire color
----------+------------+---------+--------+------------+------------
RXD0      | GPIO15     |   10    |  Alt0  | TXD        | Red
TXD0      | GPIO14     |    8    |  Alt0  | RXD        | Brown

MiniUart (UART1)

RPi Func  |  RPi GPIO  |  PIN #  |  MODE  | CP2104 Pin | Wire color
----------+------------+---------+--------+------------+------------
RXD1      | GPIO15     |   10    |  Alt5  | TXD        | Red
TXD1      | GPIO14     |    8    |  Alt5  | RXD        | Brown
GND       | GND        |    6    |        | GND        | Green