UART API protocol

DIY Products&Projects DIY Product Questions
1

For an audio system, I’m trying to develop a driver for the Up2Stream Mini that uses the UART port (and not the HTTP API) . So far I have been using this as a specification of the API together with the information in this topic .

I have a number of questions, especially regarding the format of messages.:

  1. When I send a query, does it need to be terminated with a semi-colon “;”? e.g.
        VER;
  1. I am assuming that all commands to be executed have their parameter list terminated with semi-colon. Am I right? e.g.:
     VOL:23;
  1. How are responses terminated? For instance with a newline:
     VOL:23\n

or some other way.?

  1. In sending a command or query are these also additionally terminated with a newline “\n”? e.g:
     BAS;\n

or for an executable command:

     BAS:-3;\n
  1. And finally, what are the logic levels for the UART port,? 3.3V or 5V?

Many thanks if someone can give me some answers.

1 Like
2

Hi Adoble, all commands are sent and received with ‘;’ terminator, and as all commands are ASCII text based, so you could ignore all the non alpha digital characters received, including the 0x0a or 0x0d, etc.

3

Many thanks,

I’ll change my code to reflect this.

Cheers, Andrew