FAQ

How do I get access to the testbed ?

This is explained on the Getting Started page

How do I know which serial interface (/dev/ttyUSBX) is connected to what device?

If you use one of the 'CoT' Disk Images, symlinks are automatically created in '/dev' that will allow you to identify each serial port:

• OpenUSB: /dev/ttyOPENUSB
• EZRUSB@433 MHz: /dev/ttyEZR433
• EZRUSB@868 MHz: /dev/ttyEZR868
• EFM32GG+LoRa: /dev/ttyLORA

By referring to these symlinks instead of the /dev/ttyUSBX-devices directly you can be sure that you are talking to the correct device.

If you are not using one of the 'CoT' images, you can add the necessary udev-rules needed to to do by copying /etc/udev/rules.d/50-persistent-usb.rules from one of the 'CoT' images to your own image.

How can I flash/erase the EZRUSB devices ?

If you use one of the 'CoT' Disk Images, the EZRUSB devices can be programmed using the flash_ezr script. This script can be invoked as follows:

flash_ezr <device> <elf-file>

Where:

• <device> is one of 'EZR433' or 'EZR868', depending on whether you want to flash the 433MHz or 868MHz device
• <elf-file> is the ELF-image to flash to the device.

Likewise, the erase_ezr script can be used to erase an EZRUSB device. This script is invoked in exactly the same way as the flash_ezr script, except that no ELF-image file is specified.

Even if you are not using one of the 'CoT' images, you are strongly advised to use the flash_ezr and erase_ezr scripts since these scripts contain the logic required to ensure that the 'correct' device is flashed/erased.

You can add these scripts to your own image by simply copying them from the /usr/local/bin directory from one of the 'CoT'-images to your own image, but to run them OpenOCD (0.9.0 or later) does need to be installed.

How can I flash/erase the LoRa device ?

The 'LoRa' device is basically a Giant Gecko starter kit equipped with an RFM95W LoRa module. (See [Node Specifications]). This module is equipped with an on-board J-Link debugger, so debugging/programming/erasing this board is done in exactly the same way as it is for any other SiLabs MCU. (See here for the offical 'Getting Started' guides.

To make things a bit easier, all 'CoT' disk images already contain the necessary J-Link software as well as a few helper scripts. Flashing the 'LoRa'-device can be done using the flash_lora script. This script is invoked as follows:

flash_lora <device> <elf-file> Where:

• <elf-file> is the ELF-image to flash to the device.

Likewise, the erase_lora script can be used to erase the 'LoRa-'device. This script is invoked in exactly the same way as the flash_lora script, except that no ELF-image file is specified.

If you are not using one of the 'CoT'-images, you first need to install the J-Link Software And Documentation Pack for your specific operating system. Once this package is installed you can add the flash_lora and erase_lora scripts to your image to make flashing and erasing the device a bit easier. These scripts can be found in the /usr/local/bin directory in any of the 'CoT' disk images.

I have a question and I can't find the answer on the Wiki

Please send your question to . We'll be happy to help you along and update the documentation where necessary.