TELEMETRY DATA INTERFACE

The repo contains firmware for sending data over UART across the linux ecosystem. The path for the TTY device is defined as device in firmware.c. Edit the string to point the program to the right device.

Purpose

The repo is meant to send across TTY devices in a linux ecosystem and will be used for RISCV ACT Framework Enablement.

Running

The code has been compiled using gcc version 13.3.0 in Ubuntu 6.17.0.

To run the code.

• Clone the repo

  git clone https://github.com/eric-14/RISC-V-Support-for-ACT-Framework-development.git
  

• Navigate to the Termios folder and compile the firmware.

  gcc firmware.c -o firmware
  

• Finally run the firmware.

  ./firmware 
  

Common Errors

• Failed to open port - The file descriptor points to the wrong device. Confirm the path of the TTY device. The default path is

    ```sh
     /dev/pts/4
  
    ```
  

Testing

Testing has been done using socat. A Linux tool for testing networking devices. In this instance we use socat to simulate TTY devices.

Running SOCAT

• Install socat in your system using.

    ```sh
    sudo apt update; 
    sudo apt install socat
  
    ```
  

• After installing socat the next step is to set it up to simulate virtual TTY devices. Run the command below. sh socat -d -d pty,raw,echo=0 pty,raw,echo=0

• The result should like the example below

        ```sh
            2026/04/22 11:35:08 socat[381065] N PTY is /dev/pts/4
            2026/04/22 11:35:08 socat[381065] N PTY is /dev/pts/5
            2026/04/22 11:35:08 socat[381065] N starting data transfer loop with FDs [5,5] and [7,7]
        ```
  

• You have now successfully set up a TTY channel where you can send bytes from /dev/pts/4 and receive it at /dev/pts/5 and vice versa.

• Once you configure the TTY device the firmware will automatically send the ignition message to /dev/pts/4 and running the following message will show the ignition message. ```sh cat /dev/pts/5

            ```
  

• Finally to send bytes to the firmware, run the following command. ```sh echo "Thank you Ignition for sharing" > /dev/pts/4

    ```
  

Results of Testing

Image shows firmware sending message over TTY channel

Image of firmware receiving message sent over TTY channel