How to change serial buffer size for Arduino Due?

Question

I've met this problem that Arduino Due takes more time to complete the serial writing than Mega 2560 or Uno.

Here is the code I'm using to test:

int t1,t2;
void setup() {
  Serial.begin(115200); 
}

void loop() {
  t1=micros();
  Serial.println("ABCDEFGHABCDEFGHABCDEFGHABCDEFGHABCDEFGHABCDEFGHABCDEFGH01234567");
  t2=micros();
  Serial.print("time taken: ");
  Serial.println(t2-t1);
  delay(500);
}

It takes Arduino Due 5,500 microseconds while it takes Arduino Mega 2560 600 microseconds.

To change the serial buffer size for the Mega, I know the buffer size is defined in the Hardwareserial.h at C:\Arduino\hardware\arduino\avr\cores\arduino. But I could not find the buffer size definition in the corresponding file for the Arduino Due.

Does anyone know how to make the Arduino Due have a faster serial writing speed? We need to transmit the data wirelessly so we could not use the native port although it's very fast.

Thanks!

Jook Jook · Accepted Answer · 2014-11-03T03:02:21

Well, I was looking for that as well, filesearch revealed:

C:\Arduino\hardware\arduino\sam\cores\arduino\RingBuffer.h - line 28

Having the Arduino 1.5.7 and this works for Arduino Due Programming and Native Port.

How to change serial buffer size for Arduino Due?

2 Answers