Sending raw data over USB

Projects Networking, Protocols, and Devices
1

I have a device (Specificity a Light-O-Rama USB adapter ) that receives raw hexadecimal values over USB. I am using an Arduino GIGA R1 WiFi to send theses values, but I cant find any documentation on doing so from the Arduino_USBHostMbed5 Library.

Any help would greatly be appreciated.

2

USB simply transmits bytes of data without any regard for their content. The interpretation of this data is left to the user software and the protocols that have been implemented.

3

Welcome to the forum

Please give an example of some values that you want to send

4

Some values that I’m looking to send are:
0x00
All the way up to 0xFF
And some in between:
0x56
0x81
0x01
As a few examples

With some of these values other values need to be sent with it. For example: most commands are in this order

  1. 0x00
  2. 0xFF
  3. Command
  4. Metadata
  5. Channel Number

I’m following this documentation documentation as to what I should send to the Light-O-Rama adapter:
(lightorama-protocol/PROTOCOL.md at master · Cryptkeeper/lightorama-protocol · GitHub)

5

In order to send multiple bytes you have two choices. You can either send a series of single bytes using individual Serial.write() commands like this

Serial.write(0x00);  //empty byte
Serial.write(0xFF);  //broadcast to all IDs
Serial.write(0x03);  //brightness command
Serial.write(0x0A);  //brightness level

or as a single command like this

byte data[] = {0x00, 0xFF, 0x03, 0x0A};
Serial.write(data, sizeof(data));  //send data from data buffer

This assumes that you have a serial link between the Arduino and the peripheral. Change the name of the serial port to match the one that you are using on the Arduino

7

How would I connect it directly to the USB A port on the Arduino GIGA

8

I know very little about the GIGA but if it is a USB A port then I don't think that you can use it for a Serial interface. Someone with more knowledge than me will need to give you advice

A simple Google search turned up this page

https://docs.arduino.cc/language-reference/en/functions/communication/serial/

from which it seems that the GIGA has 4 Serial interfaces

GIGA R1 WiFi 0(RX), 1(TX) 19(RX1), 18(TX1) 17(RX2), 16(TX2) 15(RX3), 14(TX3)

9

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