Raspberry Pi Mini UART

Hardware

Electronics

Embedded

Published

January 11, 2021

Modified

January 11, 2021

Setup with Breadboard

FTDI USB Device

FTDI (Future Technology Devices International)

…manufactures devices converting RS-232…
Device in this example …FT232RQ USB 2.0 Slave to UART Converter
…TTL serial transmissions to USB signals

After plugin the device should be visible on the USB bus…

>>> lsusb | grep FT232
Bus 001 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC

UART Communication

Uses/dev/ttyS0 for Linux console output:

…documentation about Raspberry Pi UART Configuration
…make sure to jumper the logic level to 3.3V
…enable the Linux console by adding enable_uart=1 in /boot/config.txt

Default UART GPIO pins:

Pin	Description
6	GND (ground)
8	TX (transmit)
10	RX (receive)

Open a terminal and use Screen to the FTDI adapter:

screen /dev/ttyUSB0 115200
# exit with ctrl-a K

---
title: Raspberry Pi Mini UART
categories:
  - Hardware
  - Electronics
  - Embedded
date: 2021/01/11
date-modified: 2021/01/11
---

![Setup with Breadboard](_images/ftdi.jpg)

### FTDI USB Device

FTDI (Future Technology Devices International)

* ...manufactures devices converting RS-232...
* Device in this example ...[FT232RQ USB 2.0 Slave to UART Converter](https://www.ftdichip.com/Products/ICs/FT232R.htm)
* ...TTL serial transmissions to USB signals

After plugin the device should be visible on the USB bus...

```sh
>>> lsusb | grep FT232
Bus 001 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
```

### UART Communication

Uses`/dev/ttyS0` for Linux console output:

* ...documentation about Raspberry Pi [UART Configuration](https://www.raspberrypi.org/documentation/configuration/uart.md)
* ...make sure to jumper the logic level to **3.3V** 
* ...enable the Linux console by adding `enable_uart=1` in `/boot/config.txt`

Default UART GPIO pins:

Pin | Description
----|------------
6   | GND (ground)
8   | TX (transmit)
10  | RX (receive)


Open a terminal and use Screen to the FTDI adapter:

```sh
screen /dev/ttyUSB0 115200
# exit with ctrl-a K
```