Arduino Mega 2560 Serial Input Cycle Problem

Projects Programming
26

I run your code on a Mega.

  • if stimulated via serial monitor, it works on a string of 'C's which are closer than 100 ms
  • if stimulated with processing there was no reception, regardless of the character spacing
  • it started to work after inserting a delay after the open, to give the processor time to reset

I guess you are triggering the bootloader by sending serial data in the reset phase,
like I did with the very first approach.

This is processing sketch I used

import processing.serial.*;
Serial port;

String inString = "nothing";

void setup() {
  size(400, 400);
  noStroke();
  background(200);
  printArray(Serial.list());
  port = new Serial(this, "COM28", 115200);
  port.bufferUntil('\n');
  delay(2000);
}
int lastSend;
byte msg[] = { 'C' };

void draw() {
  if (millis()-lastSend >= 100) {
    lastSend = millis();
    port.write(msg);
    print('C');
  }
}
void serialEvent(Serial p) {
  inString = trim(p.readString());
  println(inString);
}