[chronojump] Added arduino signalGenerator for testing

[Xavier Padullés <xpadulles src gnome org>]

commit 3851e5fa990e9394cc82bef1fe375810c3b098e3
Author: Xavier Padullés <x padulles gmail com>
Date:   Fri Mar 23 17:49:32 2018 +0100

    Added arduino signalGenerator for testing

 arduino/signalGenerator/signalGenerator.ino |  102 +++++++++++++++++++++++++++
 1 files changed, 102 insertions(+), 0 deletions(-)
---
diff --git a/arduino/signalGenerator/signalGenerator.ino b/arduino/signalGenerator/signalGenerator.ino
new file mode 100644
index 0000000..3f43813
--- /dev/null
+++ b/arduino/signalGenerator/signalGenerator.ino
@@ -0,0 +1,102 @@
+/*
+signalGenerator: Generates a digital signal following different sequences defined in sequences[]
+
+Copyright (C) 2018 Xavier de Blas xaviblas gmail com
+Copyright (C) 2018 Xavier Padullés support chronojump org
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define   signalPin   2
+#define   ledPin      13
+
+//first num is the last element position
+//2nd param is start mode
+//values are in milliseconds
+const String sequences [] = {
+  "5;IN;100;1500;200;5000",
+  "6;OUT;1100;40;1200;30;8000"
+};
+
+void setup() {
+  pinMode(signalPin, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  //signalOn(500);
+  //signalOff(100);
+
+  //always read 2nd string. TODO: do it by serial port
+  int strNum = 0;
+  processString(strNum);
+}
+
+void processString(int n)
+{
+  String sequence = sequences[n]; //TODO: check n is not greater than sequences length
+
+  int last = getValue(sequence, ';', 0).toInt();
+  String currentStatus = getValue(sequence, ';', 1);
+  for (int i = 2; i <= last; i++)
+  {
+    int duration = getValue(sequence, ';', i).toInt();
+
+    if (currentStatus == "IN")
+      signalOn(duration);
+    else
+      signalOff(duration);
+
+    //invert status
+    if(currentStatus == "IN")
+      currentStatus = "OUT";
+    else
+      currentStatus = "IN";
+  }
+}
+
+// https://stackoverflow.com/questions/9072320/split-string-into-string-array
+String getValue(String data, char separator, int index)
+{
+  int found = 0;
+  int strIndex[] = {0, -1};
+  int maxIndex = data.length() - 1;
+
+  for (int i = 0; i <= maxIndex && found <= index; i++) {
+    if (data.charAt(i) == separator || i == maxIndex) {
+      found++;
+      strIndex[0] = strIndex[1] + 1;
+      strIndex[1] = (i == maxIndex) ? i + 1 : i;
+    }
+  }
+
+  return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
+}
+
+void signalOn(int duration) {
+  Serial.print("\nsignalON ");
+  Serial.println(duration);
+  digitalWrite(signalPin, HIGH);
+  digitalWrite(ledPin, HIGH);
+  delay(duration);
+}
+
+void signalOff(int duration) {
+  Serial.print("\nsignalOFF ");
+  Serial.println(duration);
+  digitalWrite(signalPin, LOW);
+  digitalWrite(ledPin, LOW);
+  delay(duration);
+}
+