Setting Up UART Serial Communication between Raspberry Pis. Posted on February 20. Minicom, Raspberry Pi, Serial Communication, UART. Sponsor Link 2 Comments John Vonachen says: May 7, 2019 at 1:46 pm Would it be possible for a PI to communicate with more than one other pi? Setting Up Bluetooth Serial Port Profile on Raspberry Pi using. Just curious whether anyone has built a Paper-Duino-Pi, a clever open hardware and software project that uses a standard etched.
Software-based serial port module for Raspberry Pi.
This module creates a software-based serial port using a configurable pair of GPIO pins. The serial port will appear as
/dev/ttySOFT0
.Features
![Raspberry Pi Serial Port Uart Paper Raspberry Pi Serial Port Uart Paper](/uploads/1/2/5/8/125849879/853405789.jpg)
- Works exactly as a hardware-based serial port.
- Works with any application, e.g. cat, echo, minicom.
- Configurable baud rate.
- TX buffer of 256 bytes.
- RX buffer managed by the kernel.
Compiling
Fetch the source:
Install the package
raspberrypi-kernel-headers
:Run
make
and make install
, as usual.I haven't tried cross-compiling this module, but it should work as well.
Loading
Module parameters:
- gpio_tx: int [default = 17]
- gpio_rx: int [default = 27]
Loading the module with default parameters:
Loading module with custom parameters:
Usage
The device will appear as
/dev/ttySOFT0
. Use it as any usual TTY device.You must be included in the group
dialout
. You can verify in what groups you are included by typing groups
. To add an user to the group dialout
, type:Usage examples:
Baud rate
When choosing the baud rate, take into account that:
- The Raspberry Pi is not very fast.
- You will probably not be running a real-time operating system.
- There will be other processes competing for CPU time.
As a result, you can expect communication errors when using fast baud rates. So I would not try to go any faster than 4800 bps.