From fbff41eabd59c5e01d7cc4c0dbf47688b86cf889 Mon Sep 17 00:00:00 2001
From: Dobrica Pavlinusic <dpavlin@rot13.org>
Date: Thu, 14 Jan 2016 16:36:20 +0100
Subject: [PATCH] added PS/2 Synaptics touch pad for fade in/out

---
 Desk_LED_dimmer/Desk_LED_dimmer.ino | 92 +++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/Desk_LED_dimmer/Desk_LED_dimmer.ino b/Desk_LED_dimmer/Desk_LED_dimmer.ino
index 8289fdc..c31c1ff 100644
--- a/Desk_LED_dimmer/Desk_LED_dimmer.ino
+++ b/Desk_LED_dimmer/Desk_LED_dimmer.ino
@@ -8,6 +8,9 @@ const int buzzer_pin = 4;
 const int mosfet_pins[] = { 9, 10, 6 };
 int mosfet_pwm[] = { 0, 0, 0 };
 
+#include <ps2.h>
+PS2 mouse(8, 7); // PS2 synaptics clock, data
+
 void setup() {
   Serial.begin(115200);
 
@@ -16,6 +19,37 @@ void setup() {
 
   for(int i=0; i<sizeof(mosfet_pins); i++) pinMode(mosfet_pins[i], OUTPUT);
 
+
+  mouse.write(0xff);  // reset
+  mouse.read();  // ack byte
+  mouse.read();  // blank */
+  mouse.read();  // blank */
+  mouse.write(0xf0);  // remote mode
+  mouse.read();  // ack
+  delayMicroseconds(100);
+  mouse.write(0xe8);
+  mouse.read();  // ack byte
+  mouse.write(0x03); // x1  ( x1 * 64  +  x2 * 16  +  x3 * 4  +  x4   == modebyte )
+  mouse.read();  // ack byte
+  mouse.write(0xe8);
+  mouse.read();  // ack byte
+  mouse.write(0x00); // x2
+  mouse.read();  // ack byte
+  mouse.write(0xe8);
+  mouse.read();  // ack byte
+  mouse.write(0x01); // x3
+  mouse.read();  // ack byte
+  mouse.write(0xe8);
+  mouse.read();  // ack byte
+  mouse.write(0x00); // x4
+  mouse.read();  // ack byte
+  mouse.write(0xf3); // set samplerate 20 (stores mode) 
+  mouse.read();  // ack byte
+  mouse.write(0x14);
+  mouse.read();  // ack byte
+  delayMicroseconds(100); 
+
+
   Serial.println("Commands: b - beep, qwe/asd/zxc - MOSFETs");
 
 }
@@ -41,7 +75,65 @@ void mosfet(int nr, int value) {
   mosfet_pwm[nr] = value;
 }
 
+
+unsigned int last_cx = 0;
+unsigned int last_cy = 0;         
+
+
 void loop() {
+
+  byte mstat1;
+  byte mstat2;
+  byte mxy;
+  byte mx;                    //x coordinate
+  byte my;                    //y coordinate
+  byte mz;                    //z pressure value
+
+  unsigned int cx,cy;
+
+  mouse.write(0xeb);
+  mouse.read();
+  
+  mstat1 = mouse.read();
+  mxy = mouse.read();
+  mz = mouse.read();
+  mstat2 = mouse.read();
+  mx = mouse.read();
+  my = mouse.read();
+
+
+  // collect the bits for x and y
+  cx = (((mstat2 & 0x10) << 8) | ((mxy & 0x0F) << 8) | mx ); // 1100-5800
+  cy = (((mstat2 & 0x20) << 7) | ((mxy & 0xF0) << 4) | my ); // 800-5000
+
+  if ( last_cx != cx || last_cy != cy ) {
+    last_cx = cx;
+    last_cy = cy;
+    Serial.print("X=");
+    Serial.print(cx, DEC);
+    Serial.print("\tY=");
+    Serial.print(cy, DEC);
+    Serial.print("\tZ=");
+    Serial.print(mz, DEC);
+    if ( cx > 1100 && cy > 800 ) {
+      int nr  = ( cx - 1100 ) / (( 5800 - 1100 ) / 3);
+      int pwm = ( cy - 800  ) / (( 5000 - 800  ) / 255);
+      pwm -= 1; // allow off
+      Serial.print("\tmosfet = ");
+      Serial.print(nr);
+      Serial.print("\tpwm = ");
+      Serial.print(pwm);
+      if ( nr >= 0 && nr <= 2 && pwm >= 0 && pwm <= 255 ) {
+        analogWrite(mosfet_pins[nr], pwm);
+        Serial.print("\tOK");
+      } else {
+        Serial.print("\tIGNORED");
+      }
+    }
+    Serial.println();
+  }
+  
+
   if (Serial.available()) {
     digitalWrite(led_pin, HIGH);
     int in = Serial.read();
-- 
2.20.1