Support for 921600 baudrate

[pallix]

Hello,

I tried to extend the code to get a baudrate of 921600 by adding:

else if (speed == 921600) {
    cfsetispeed(&fdt, B921600);
    cfsetospeed(&fdt, B921600);
  } 

However, after testing the change by using your baud library, I notice that the data are transmitted wrongly: inputs and outputs do not match.

[samuelventura]

Can you share what code you test the output/input with?

[pallix]

I made a second try and it works. Sorry for that. I did test a lot of things yesterday, maybe I forgot to set the baudrate on the receiver?

Just for the record the code is:

defmodule BaudEvaluation.Write do
  @moduledoc """
  Write to the serial port
  """

  @buff_size 1024

  def write(filename) do
    device = Application.get_env(:baud_evaluation, :writeDeviceName)
    IO.puts device
    {:ok, serial} = Baud.start_link([device: device, speed: 921600])
    file = File.open!(filename)
    write_loop(serial, file)
  end

  def write_loop(serial, file) do
    case IO.binread(file, @buff_size) do
      :eof -> IO.puts "done"
      {:error, reason} -> IO.puts("Error" <> reason)
      content ->
        IO.puts(byte_size(content))
        Baud.write(serial, content)
        write_loop(serial, file)
    end
  end

end

I will submit a PR for the baudrate.

[jvf]

The new baudrates from #4 break building sniff on macOS. Tested on macOS 10.12.6 (16G1114).

See tomszilagyi/gen_serial#1 for a description of the problem and Gottox/node-termios#2 for a possible solution.

[pallix]

@samuelventura any news on fixing the MacOS issue?

[samuelventura]

185b67d introduces separated baudrate files for linux/darwin. Both compile after that.

[pallix]

That is awesome. Many thanks for your work!

[samuelventura]

@jvf Thank you for your research on this.