CODEWITHSUNDEEP
serial-portred-lang
Giuseppe Chillemi
Giuseppe Chillemi

Reputation: 61

How do I access serial port in RED?

I need to access some weighing machines via serial port. How could I red/write data from/to it using the RED Programming language ?

Upvotes: 4

Views: 243

Answers (2)

iceflow19
iceflow19

Reputation: 822

As DocKimbel mentioned, most IO support is not yet implemented, but that does not mean you can't manually implement the functionality in Red/System.

The following information is pertinent if you are compiling for Windows.

To keep things simple I'd recommend following a polling approach as described in the first half of this article.

Actually most of the functions you need are already in simple-io.reds. Specifically, you'll have to use the following functions under the simple-io context:

  • CreateFileA
  • ReadFile
  • WriteFile

You may also need DeleteFileA, and GetLastError. simple-io doesn't import them (only the wide string variant on DeleteFile), so you'll have to do them yourself by importing it from kernel32.dll in stdcall mode. You'll also need to import SetCommState().

BOOL WINAPI SetCommState(
  _In_ HANDLE hFile,
  _In_ LPDCB  lpDCB
);

You will need a DCB (Device Control Block) struct for the second parameter.

Once you get it working at the Red/System level then can you wrap each of your basic com functionalities in a routine! abstracting out some of the low level c aspects and exposing the low-level code to your Red code.

Upvotes: 0

DocKimbel
DocKimbel

Reputation: 3199

Serial port and most of I/O are not yet implemented in Red.

Please have a look at the Red Trello board to get an overview of the parts left to be done.

Upvotes: 1

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