Mixing of Serial and Sofware serial objects in an sketch function

Projects Programming
1

Hello. This is my first post in this forum . I'm novice in arduino programming, and have some troubles working with serial ports:

I want to use 2 serial ports: the standard one and a SoftwareSerial port attached to an HC12 transceiver

I don't know (yet) how to writting this code by mean of event driven methods, and at this moment polling is enought for me. So in my sketch I wrote something like:

....
#include <SoftwareSerial.h>
#include <Stream.h>
....
  SoftwareSerial HC12(HC12TxdPin,HC12RxdPin); 
.....

int getData( Stream channel, char buffer[],int offset) {
    while (channel.available()) {
      c =channel.read();
      if (c=='

When trying to compile sketch I get this error:
cannot declare parameter 'channel' to be of abstract type 'Stream'

AFAIK, either Serial and SoftwareSerial inherits from Stream.

So what's the right way to write this code ?
Any (not so long ) explanation of how to dealing with theses issues will be appreciated

Thanks in advance
Juan Antonio) { // terminator mark
        buffer[offset]=0; // null terminate buffer
        return 0;
      } else {
        buffer[offset]=c;
        offset++;
        if (offset==64) { // at end of buffer
          buffer[63]=0;
          return 0;
        } // end of buffer
      } // not ending mark
  } // while
  // no more available data but not yet received end mark
  return offset;
} // method
.....

void setup() {
  Serial.begin(115200);
  HC12.begin(9600);
....
}

void loop() {
...
serialInputOffset = getData(Serial,serialInputBuffer,serialInputOffset);
if (serialInputOffset == 0 ) serialInputData=String(serialInputBuffer);
...
hc12InputOffset = getData(HC12,hc12InputBuffer,hc12InputOffset);
if (hc12InputOffset == 0 ) hc12InputData= String(hc12InputBuffer);
...


When trying to compile sketch I get this error:
*cannot declare parameter 'channel' to be of abstract type 'Stream'*

AFAIK, either Serial and SoftwareSerial inherits from Stream.

So what's the right way to write this code ?
Any (not so long ) explanation of how to dealing with theses issues will be appreciated

Thanks in advance
Juan Antonio
2

So what's the right way to write this code ?

You need to understand that C (and C++) are pass-by-value languages. What you are trying to pass to the function is a Stream object. You can't do that.

You want to pass the Stream object by reference, effectively says here's a Stream instance that you can use.

int getData( Stream &channel, char buffer[],int offset) {

3

Oh! I feel so stupid... so many time programming in other languages :slight_smile:

Work fine, thanks