In this series:
Hi everyone. Jean-Benoît Larouche here with part three of this video serie on the ZeptoSDR platform. In part one and two, we unwrapped the box. We plugged in the system and we looked into the booting sequence of the ZeptoSDR. So assuming that all connections between the ZeptoSDR and the computer are made, the first step is to validate that you are able to communicate with the board using the ARM-UART connection and the Ethernet port.
Let's start with the Ethernet connectivity. The quickest way to validate the link is to do a simple PING at the default address of the ZeptoSDR, which is the one shown on the screen. If it does not respond, verify that the network adapter used to communicate with the board is set to an IP address on the same subnet mask.
For the UART communication, a driver will probably need to be installed. It should be plug-and-play and Windows Update should find it and install it automatically. To verify the correct installation, go into your Device Manager and you shall find a USB-to-serial communication link with the COM Port number associated.
So now, using both interfaces you can access the Linux operating system which runs on the ARM processor using any telnet or SSH client, like PuTTY, which is a freeware on the internet. The communication speed for the UART is 115200 bps. Once the connection is established, you can access the file system and run the already compiled Linux examples in the ROOT folder.
Four examples are provided.
The TX example generates a 1 megahertz tone in the FPGA and output to the front panel TX port. Since the radio is configured at 943 megahertz, a tone should appear at 944 megahertz on the spectrum scope. The Rx example take the input signal at the Rx input port and transmits it to the ARM processor for recording. You can later access the recorded file using an FTP client program like FileZilla, using the default IP address of the board. To access the file system, simply enter the IP address followed by the login and the password, which is root for both fields on Port 22.