From c90f65ff858d68abbeb4fe2663799a7273c95898 Mon Sep 17 00:00:00 2001
From: DechAmim <michaelduncanjones@gmail.com>
Date: Mon, 30 Jan 2017 13:40:28 -0500
Subject: [PATCH] Parallel panel LED support

Status LEDs for heaters and fan when using a parallel panel. Default
configuration designed with red/green rotary encoder in mind, but easily
extensible to any combination of LEDs.

Space for this was already allotted in the code, just filled in the
placeholder. Tested with an Arduino Pro Mini and a Sparkfun Red/Green
rotary encoder, no obvious issues were found.
---
 upa.cpp | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 52 insertions(+), 6 deletions(-)

diff --git a/upa.cpp b/upa.cpp
index e4be03f..945e25b 100644
--- a/upa.cpp
+++ b/upa.cpp
@@ -18,8 +18,8 @@ SS   -> D10
 */
 
 // select the Panel being used
-#define VIKI 1
-//#define PARALLEL 1
+//#define VIKI 1
+#define PARALLEL 1
 
 #ifdef VIKI
 #include "LiquidTWI2.h"
@@ -44,14 +44,18 @@ LiquidCrystalFast lcd(LCD_RS, LCD_RW, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7);
 
 #define CLICK_PIN  A2 // A2 Encoder click pin
 #define BUZZER_PIN A3 // A3 Buzzer pin
-#define LED1       A4 // optional LED1
-#define LED2       A5 // optional LED2
+#define LED1       A4 // optional LED1: Green LED
+#define LED2       A5 // optional LED2: Red LED
+#define LED3       A6 // optional LED3: Fan LED
+
+#define FAN_LED 0x01
+#define HOT_LED 0x02
+#define BED_LED 0x04
 
 #else
 #error "One of VIKI or PARALLEL needs to be defined"
 #endif
 
-
 typedef struct {
 	byte cmd;
 	byte len;
@@ -117,7 +121,42 @@ static void setLed(byte led)
 #ifdef VIKI
 	lcd.setBacklight(led);
 #elif defined(PARALLEL)
-	// TODO if we have leds set them
+
+/* The following was designed around a red/green LED rotary encoder
+ *  (such as the Sparkfun COM-10596) and an extra LED for the fan, 
+ *  but can be easily implemented for any hardware combination
+ * 
+ * In the default setting, OFF = green, BED | HOT = yellow, BED & HOT = red
+ */
+    
+  
+  switch(led & ~0x1) //Eliminating the FAN bit to simplify setting the encoder
+  {
+    case HOT_LED:
+      digitalWriteFast(LED1, HIGH);
+      digitalWriteFast(LED2, HIGH); //Yellow
+      break;
+    case BED_LED:
+      digitalWriteFast(LED1, HIGH);
+      digitalWriteFast(LED2, HIGH); //Yellow
+      break;
+    case (BED_LED | HOT_LED): //Fan & Bed ON
+      digitalWriteFast(LED1, LOW); 
+      digitalWriteFast(LED2, HIGH); //Red
+      break;
+    default:
+      digitalWriteFast(LED1, HIGH);
+      digitalWriteFast(LED2, LOW);  //Green
+      break;
+  }
+
+  //The Fan LED is set separately
+  if (led & 0x1){
+    digitalWriteFast(LED3, HIGH);
+  }
+  else {
+    digitalWriteFast(LED3, LOW);
+  } 
 #endif
 }
 
@@ -214,6 +253,13 @@ void setup (void)
   	lcd.setMCPType(LTI_TYPE_MCP23017);
 #elif defined(PARALLEL)
   	pinMode(CLICK_PIN, INPUT_PULLUP);
+    pinMode(LED1, OUTPUT);
+    pinMode(LED2, OUTPUT);
+    pinMode(LED3, OUTPUT);
+
+    digitalWriteFast(LED1, HIGH); //Initialize everything as green by default
+    digitalWriteFast(LED2, LOW);
+    digitalWriteFast(LED3, LOW);
 #endif
 
   	// set up the LCD's number of rows and columns: