Hardware serial write arduino

Question

I am try to do a write to serial using a NANO. This is my current code

#include "HardwareSerial.h"

long previousMillis = 0;
long interval = 2000;    

void setup() {
  // put your setup code here, to run once:
 pinMode(13, OUTPUT);
 digitalWrite(13, HIGH);
 Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > interval) {
    previousMillis = currentMillis; 


    HardwareSerial serial = Serial;
    serial.write("hello");
  }
}

However when I monitor the serial using a serial monitor I only get

he

for each serial write. Please help

One thing I do have to use HardwareSerial and not the normal serial class unfortunately — Jed
Why are you creating a new HardwareSerial object in each iteration? You can just do Serial.write(). Not sure, but this might be the problem as you only call begin() on the global Serial object and I have no idea if that state gets tranfered during a copy. — JorenHeit
In my main project which yields the same results I pass the Serial object into a function func(HardwareSerial serial) so the recreation isnt the issue — Jed
If you're passing it by value, as it seems you are doing, the exact same thing happens (a local copy is constructed). The Serial object is available globally so there is no need in making copies or passing it to functions. — JorenHeit
Could you send the construction code to create the HardwareSerial instance — Jed

Jed Jed · Accepted Answer · 2015-08-24T05:50:51

I have changed the class type in my method from hardwareserial to stream &serial this is now working the way it should. Thanks for the help

Hardware serial write arduino

1 Answers