Serial Call and Response (handshaking)

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1/*
2
3  Serial Call and Response
4
5  Language: Wiring/Arduino
6
7  This program sends an ASCII A (byte of value 65) on startup and repeats that
8
9  until it gets some data in. Then it waits for a byte in the serial port, and
10
11  sends three sensor values whenever it gets a byte in.
12
13  The circuit:
14
15  - potentiometers attached to analog inputs 0 and 1
16
17  - pushbutton attached to digital I/O 2
18
19  created 26 Sep 2005
20
21  by Tom Igoe
22
23  modified 24 Apr 2012
24
25  by Tom Igoe and Scott Fitzgerald
26
27  Thanks to Greg Shakar and Scott Fitzgerald for the improvements
28
29  This example code is in the public domain.
30
31  https://www.arduino.cc/en/Tutorial/SerialCallResponse
32
33*/
34
35int firstSensor = 0;    // first analog sensor
36int secondSensor = 0;   // second analog sensor
37int thirdSensor = 0;    // digital sensor
38int inByte = 0;         // incoming serial byte
39
40void setup() {
41
42  // start serial port at 9600 bps:
43
44  Serial.begin(9600);
45
46  while (!Serial) {
47
48    ; // wait for serial port to connect. Needed for native USB port only
49
50  }
51
52  pinMode(2, INPUT);   // digital sensor is on digital pin 2
53
54  establishContact();  // send a byte to establish contact until receiver responds
55}
56
57void loop() {
58
59  // if we get a valid byte, read analog ins:
60
61  if (Serial.available() > 0) {
62
63    // get incoming byte:
64
65    inByte = Serial.read();
66
67    // read first analog input, divide by 4 to make the range 0-255:
68
69    firstSensor = analogRead(A0) / 4;
70
71    // delay 10ms to let the ADC recover:
72
73    delay(10);
74
75    // read second analog input, divide by 4 to make the range 0-255:
76
77    secondSensor = analogRead(1) / 4;
78
79    // read switch, map it to 0 or 255L
80
81    thirdSensor = map(digitalRead(2), 0, 1, 0, 255);
82
83    // send sensor values:
84
85    Serial.write(firstSensor);
86
87    Serial.write(secondSensor);
88
89    Serial.write(thirdSensor);
90
91  }
92}
93
94void establishContact() {
95
96  while (Serial.available() <= 0) {
97
98    Serial.print('A');   // send a capital A
99
100    delay(300);
101
102  }
103}
104
105/* Processing sketch to run with this example:
106
107  // This example code is in the public domain.
108
109  import processing.serial.*;
110
111  int bgcolor;           // Background color
112
113  int fgcolor;           // Fill color
114
115  Serial myPort;                       // The serial port
116
117  int[] serialInArray = new int[3];    // Where we'll put what we receive
118
119  int serialCount = 0;                 // A count of how many bytes we receive
120
121  int xpos, ypos;                // Starting position of the ball
122
123  boolean firstContact = false;        // Whether we've heard from the microcontroller
124
125  void setup() {
126
127    size(256, 256);  // Stage size
128
129    noStroke();      // No border on the next thing drawn
130
131    // Set the starting position of the ball (middle of the stage)
132
133    xpos = width / 2;
134
135    ypos = height / 2;
136
137    // Print a list of the serial ports for debugging purposes
138
139    // if using Processing 2.1 or later, use Serial.printArray()
140
141    println(Serial.list());
142
143    // I know that the first port in the serial list on my Mac is always my FTDI
144
145    // adaptor, so I open Serial.list()[0].
146
147    // On Windows machines, this generally opens COM1.
148
149    // Open whatever port is the one you're using.
150
151    String portName = Serial.list()[0];
152
153    myPort = new Serial(this, portName, 9600);
154
155  }
156
157  void draw() {
158
159    background(bgcolor);
160
161    fill(fgcolor);
162
163    // Draw the shape
164
165    ellipse(xpos, ypos, 20, 20);
166
167  }
168
169  void serialEvent(Serial myPort) {
170
171    // read a byte from the serial port:
172
173    int inByte = myPort.read();
174
175    // if this is the first byte received, and it's an A, clear the serial
176
177    // buffer and note that you've had first contact from the microcontroller.
178
179    // Otherwise, add the incoming byte to the array:
180
181    if (firstContact == false) {
182
183      if (inByte == 'A') {
184
185        myPort.clear();          // clear the serial port buffer
186
187        firstContact = true;     // you've had first contact from the microcontroller
188
189        myPort.write('A');       // ask for more
190
191      }
192
193    }
194
195    else {
196
197      // Add the latest byte from the serial port to array:
198
199      serialInArray[serialCount] = inByte;
200
201      serialCount++;
202
203      // If we have 3 bytes:
204
205      if (serialCount > 2 ) {
206
207        xpos = serialInArray[0];
208
209        ypos = serialInArray[1];
210
211        fgcolor = serialInArray[2];
212
213        // print the values (for debugging purposes only):
214
215        println(xpos + "\t" + ypos + "\t" + fgcolor);
216
217        // Send a capital A to request new sensor readings:
218
219        myPort.write('A');
220
221        // Reset serialCount:
222
223        serialCount = 0;
224
225      }
226
227    }
228
229  }
230
231*/
232
233/* Max/MSP version 5 patch to run with this example:
234
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411-----------end_max5_patcher-----------
412
413*/