Software serial for two separate connections?

Projects General Guidance
1

An ATtiny85 is to be used to receive GPS data on the software serial dedictaed RX pin. A GSM module is to be connected to the software serial dedicated TX pin.
Is this possible?
What best approach to use?

2

Hello brice3010
Yes.
If the software serial function is able to run in full duplex mode and the baudrate for GSM and GPS is equal.
Check it.
Have a nice day and enjoy coding in C++.

3

Hi Paul, thank you for your fast reply.
Just to make sure: in one software serial declaration I can use both the GPS (RX) pin to wait for incoming data and then use the GSM (TX) pin to transmit other data?

#include <SoftwareSerial.h>
#define txPin 5      //tx pin in GSM connection
#define rxPin 3      //rx pin in GPS connection
#include <SoftwareSerial.h>
#include <TinyGPS.h>
int state = 0;
const int pin = 9;
float gpslat, gpslon;
TinyGPS gps;
SoftwareSerial mySerial(3, 5); // RX, TX

void setup()
{
  mySerial.begin(9600);
}

void loop()
{
  mySerial.listen();
  while (mySerial.available())
  {
    int c = mySerial.read();
    if (gps.encode(c))
    {
      gps.f_get_position(&gpslat, &gpslon);
    }
  }
  if (digitalRead(pin) == HIGH && state == 0) {
    mySerial.print("\r");
    delay(1000);
    mySerial.print("AT+CMGF=1\r");
    delay(1000);
    /*Replace XXXXXXXXXX to 10 digit mobile number &
      ZZ to 2 digit country code*/
    mySerial.print("AT+CMGS=\"+ZZXXXXXXXXXX\"\r");
    delay(1000);
    //The text of the message to be sent.
    mySerial.print("Latitude :");
    mySerial.println(gpslat, 6);
    mySerial.print("Longitude:");
    mySerial.println(gpslon, 6);
    delay(1000);
    mySerial.write(0x1A);
    delay(1000);
    state = 1;
  }
  if (digitalRead(pin) == LOW) {
    state = 0;
  }
}
4

Hello brice3010
My recommandation was to check the communication functions for the micro controller used, was´nt it?
You can code the world best sketch as long as your requiremets aren´t met.
Have a nice day and enjoy coding in C++.

5

Which it is can not.

6

Well I think that is taken into account by my code: only after data from the GPS is received should there be transmission to the GSM module.