add simple serial receive and transmit test for uint8_t, uint16_t, int16_t and float

serialtest_receiver_processing/serialtest_receiver_processing.pde

@@ -0,0 +1,51 @@
+import processing.serial.*;
+
+Serial serialport;
+
+void setup() {
+  printArray(Serial.list());
+  serialport = new Serial(this, Serial.list()[2], 9600);
+  println("start");
+}
+
+void draw() {
+  byte[] inBuffer = new byte[9];
+  while(serialport.available()>0) {
+    inBuffer = serialport.readBytes();
+    serialport.readBytes(inBuffer);
+    if (inBuffer!= null) {
+      int counter= inBuffer[0];
+      int value1= extract_uint16_t(inBuffer,1);
+      int value2= extract_int16_t(inBuffer,3);
+      float floatvalue = extract_float(inBuffer,5);
+      println("counter="+counter);
+      println("value1="+value1);
+      println("value2="+value2);
+      println("floatvalue="+floatvalue);
+    }
+    
+  }
+}
+
+public int extract_uint16_t(byte array[], int startbyte) {
+  return ((int)array[startbyte] & 0xff) | ((int)array[startbyte+1] & 0xff)<<8;
+}
+
+public int extract_int16_t(byte array[], int startbyte) {
+  if ( ((int)array[startbyte+1] & 0x80) == 0x00 ) { //2's complement, not negative
+    return ( ((int)array[startbyte] & 0xff) | ((int)array[startbyte+1] & 0x7f)<<8 );
+  }else{ //value is negative
+    return -32768 + ( ((int)array[startbyte] & 0xff) | ((int)array[startbyte+1] & 0x7f)<<8 );
+  }
+}
+
+public float extract_float(byte array[], int startbyte) {
+    int MASK = 0xff;
+    int bits = 0;
+    int i = startbyte+3; //+3 because goes backwards and has 4 bytes
+    for (int shifter = 3; shifter >= 0; shifter--) {
+    bits |= ((int) array[i] & MASK) << (shifter * 8);
+    i--;
+    }
+    return Float.intBitsToFloat(bits);
+}  

serialtest_sender_arduino/serialtest_sender_arduino.ino

@@ -0,0 +1,19 @@
+uint8_t counter=0;
+uint16_t value1=65531;
+int16_t value2=-123;
+float floatvalue=23.42;
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN,!digitalRead(LED_BUILTIN));
+  Serial.write((uint8_t *) &counter, sizeof(counter));//uint8_t, 1 byte
+  Serial.write((uint8_t *) &value1, sizeof(value1)); //uint16_t, 2 bytes
+  Serial.write((uint8_t *) &value2, sizeof(value2)); //int16_t, 2 bytes
+  Serial.write((uint8_t *) &floatvalue, sizeof(floatvalue)); //float, 4 bytes
+  delay(500);
+  counter++;
+}