diff options
Diffstat (limited to 'docs/getting-started/machines/raspberrypi.md')
-rw-r--r-- | docs/getting-started/machines/raspberrypi.md | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/docs/getting-started/machines/raspberrypi.md b/docs/getting-started/machines/raspberrypi.md index 7727267..ce9337c 100644 --- a/docs/getting-started/machines/raspberrypi.md +++ b/docs/getting-started/machines/raspberrypi.md @@ -176,7 +176,7 @@ the image on the Raspberry PI 2 or 3 board: 4. Plug your MicroSD card into the Raspberry PI board and boot the device. -## 5. Raspberry PI Touch Display +## 5. Using the Raspberry PI Touch Display If you have connected the official [Raspberry PI Touch Display](https://www.raspberrypi.org/products/raspberry-pi-touch-display/), @@ -221,3 +221,50 @@ path=/usr/bin/weston-flower name=DSI-1 transform=270 ``` + +## 6. Debugging + +When things go wrong, you can take steps to debug your Raspberry PI. +For debugging, you need a 3.3 Volt USB Serial cable to fascilitate +communication between your Raspberry PI board and your build host. +A good cable to use is the 3.3V USB-to-Serial cable +[Olimex USB-Serial-Cable-F](https://www.olimex.com/Products/Components/Cables/USB-Serial-Cable/USB-Serial-Cable-F/). + +**NOTE:** If you are using a USB console cable from Adafruit, see +"[Adafruit's Raspberry Pi Lesson 5](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-5-using-a-console-cable/connect-the-lead)" +for connection information. + +Use the following steps, which assume you are using the previously mentioned +Olimex cable. +You can reference the following diagram for information on the following steps: + +<p align="center"> + <img src="./images/RaspberryPi2-ModelB-debug-serial-cable.png"> +</p> + +1. Connect the Olimex cable to the Universal Asynchronous Receiver-Transmitter + (UART) connection on your Raspberry PI board. + Do not connect the USB side of the cable to your build host at this time. + + **CAUTION:** No warranty is provided using the following procedure. + Pay particular attention to the collors of your cable as they could + vary depending on the vendor. + +2. Connect the cable's BLUE wire to pin 6 (i.e. Ground) of the UART. + +3. Connect the cable's GREEN RX line to pin 8 (i.e. the TXD line) of + the UART. + +4. Connect the cable's RED TX line to pin 10 (i.e. the RXD line) of + the UART. + +5. Plug the USB connector of the cable into your build host's USB port. + +6. Use your favorite tool for serial communication between your build host + and your Raspberry PI. + For example, if your build host is a native Linux machine (e.g. Ubuntu) + you could use `screen` as follows from a terminal on the build host: + + ```bash + $ sudo screen /dev/ttyUSB0 115200 + ``` |