By default the mini uart is mapped to the txd gpio 14 and rxd gpio 15 on the 40 pin gpio header and the pl011 uart is used for the bluetooth wireless module but either module can.
Raspberry pi 3 serial console connection.
The raspberry pi 3 model b b 4 and raspberry pi zero w contain two uart controllers which can be used for serial communication the mini uart and pl011 uart.
If you are using the serial port for anything other than the console you need to disable it.
Note for raspberry pi 3.
Raspberry pi 3 and raspberry pi zero w ttys0 enabled.
You can choose any of the 4 usb ports available on the board.
Picocom q baud 115200 dev ttyusb0 after powering the raspberry pi with an opensuse sd card image you should see the boot loader output inside the terminal.
There are 2 ways to connect your raspberry pi and arduino for serial communication.
You can connect the raspberry pi to a pc using a usb serial cable or if it has an rs 232 port a level converter circuit see above for.
Follow the steps below to start the raspberry pi uart communication.
The default rate of the raspberry pi boot loader is 115200 baud.
In this segment of the tutorial you will need to have your usb serial adapter plugged into the rs232 adapter.
In this example we are using picocom.
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Then plug the raspberry pi supply and connect the converter to your pc.
The raspberry pi uses its built in serial port to allow devices to connect to its console and issue commands just as if you were logged in.
This will be slightly different depending on whether you are running a raspberry pi 3 or not.
Now it s time to connect to the serial terminal.
Raspberry pi 2 and earlier and also the raspberry pi zero ttyama0 enabled utilizing serial read and write on your raspberry pi.
By default the raspberry pi uses the serial port for the console login and via a software service called getty.
Connect the serial to usb converter to the raspberry pi board as is shown in the circuit.
Go to the device manager and find the port number that is connected to the converter.
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Getting started with the raspberry pi set up your raspberry pi and explore what it can do.
The easiest way is to use a usb cable between both board.