From 7eb547273c4177d857199384898cf5e6db1f711f Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Thu, 18 May 2006 20:24:18 +0000
Subject: first sketch of Pd-controlled firmware

svn path=/trunk/externals/hardware/arduino/; revision=5088
---
 Pd_firmware/Pd_firmware.pde | 111 ++++++++++++++++++++++++++++++++++++++++++++
 README                      |   4 ++
 2 files changed, 115 insertions(+)
 create mode 100644 Pd_firmware/Pd_firmware.pde
 create mode 100644 README

diff --git a/Pd_firmware/Pd_firmware.pde b/Pd_firmware/Pd_firmware.pde
new file mode 100644
index 0000000..7e0becd
--- /dev/null
+++ b/Pd_firmware/Pd_firmware.pde
@@ -0,0 +1,111 @@
+/* Pd_firmware
+ * ------------------
+ *
+ *
+ * It was designed to work with the Pd patch of the same 
+ * name in:  Help -> Browser -> examples -> hardware
+ *
+ * (cleft) 2006 Hans-Christoph Steiner
+ * @author: Hans-Christoph Steiner
+ * @date: 2006-03-10
+ * @location: Polytechnic University, Brooklyn, New York, USA
+ */
+
+/*
+ * Pduino protocol
+ * =============== 
+ * data: 0-127   control: 128-255
+ * 
+ * Pd->Arduino commands
+ * --------------------
+ * 150 - next byte sets PWM0 value
+ * 151 - next byte sets PWM1 value
+ * 152 - next byte sets PWM2 value
+ * 200-213 - set digital pin 0-13 to input
+ * 220-233 - set digital pin 0-13 to output
+ * 
+ *
+ * Pd->Arduino byte cycle
+ * ----------------------
+ * 0  cycle marker (255/11111111)
+ * 1  digitalOut 0-6 bitmask
+ * 2  digitalOut 7-13 bitmask
+ * 
+ * Arduino->Pd byte cycle
+ * ----------------------
+ * 0  digitalIn 0-6 bitmask
+ * 1  digitalIn 7-13 bitmask
+ * 2  analogIn0 byte0
+ * 3  analogIn0 byte1
+ * 4  analogIn1 byte0
+ * 5  analogIn1 byte1
+ * 6  analogIn2 byte0
+ * 7  analogIn2 byte1
+ * 8  analogIn3 byte0
+ * 9 analogIn3 byte1
+ * 10 analogIn4 byte0
+ * 11 analogIn4 byte1
+ * 12 analogIn5 byte0
+ * 13 analogIn5 byte1
+ * 14 cycle marker (255/11111111)
+ * 
+ * 
+ *      TX         RX
+ * -----------------------
+ *   					 
+ */
+
+/*
+ * CAUTION!! Be careful with the Serial Monitor, it could freeze 
+ * your computer with this firmware running!  It outputs data 
+ * without a delay() so its very fast.
+ */
+
+
+byte i;
+
+// this int serves as an array of bits to store pin status
+int digitalPinStatus;
+
+byte analogPin;
+int analogData;
+
+void outputDigital(byte startPin) {
+  byte digitalPin;
+  byte digitalPinBit;
+  byte digitalOutputByte;
+  byte digitalData;
+  for(i=0;i<7;++i)
+  {
+    digitalPin = i+startPin;
+    digitalPinBit = 2^digitalPin;
+    // only read the pin if its set to input
+    if(digitalPinStatus & digitalPinBit) 
+      digitalData = digitalRead(digitalPin);
+    else
+      digitalData = 0;
+    digitalOutputByte = digitalOutputByte + (2^(i+1-startPin)*digitalData);
+  }
+  printByte(digitalOutputByte);
+}
+
+void setup() {
+  beginSerial(9600);
+}
+
+void loop() {
+  // read all digital pins
+  outputDigital(0);
+  outputDigital(7);
+  /*
+   * get analog in
+   */
+  analogData = analogRead(analogPin);
+  // these two bytes get converted back into the whole number in Pd
+  printByte(analogData / 32);  // div by 32 for the big byte
+  printByte(analogData % 32);  // mod by 32 for the small byte
+  ++analogPin; 
+  if (analogPin > 5) analogPin = 0;   
+  /* end with the cycle marker */
+  printByte(255);   
+}
diff --git a/README b/README
new file mode 100644
index 0000000..a2b9678
--- /dev/null
+++ b/README
@@ -0,0 +1,4 @@
+
+The code in the examples patch are example patches that match the included examples in the Arduino package.
+
+Pd_firmware is a Arduino firmware where you can control everything from Pd, so you don't need to program in Arduino.
\ No newline at end of file
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