From bfa639d5a2a832d4189cc04b668ca6176e6a5f8f Mon Sep 17 00:00:00 2001
From: Mike C <mcrosson_scm at nusku dot net>
Date: Tue, 9 Apr 2013 17:40:12 -0400
Subject: [PATCH] Added shifter code

---
 Universal_Serial_Adapter/Config.cpp | 19 +++++++++++++++++++
 Universal_Serial_Adapter/Config.h   |  5 ++++-
 Universal_Serial_Adapter/Project.h  | 11 +++++++++--
 3 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/Universal_Serial_Adapter/Config.cpp b/Universal_Serial_Adapter/Config.cpp
index 0d521d0..12adbca 100644
--- a/Universal_Serial_Adapter/Config.cpp
+++ b/Universal_Serial_Adapter/Config.cpp
@@ -8,6 +8,8 @@
  attribute.
  */
 
+#include "Arduino.h"
+
 #include "Project.h"
 #include "Config.h"
 
@@ -70,6 +72,23 @@ void Config::setLineSpeed(linespeed speed) {
 
 void Config::setVoltage(ttlvoltage voltage) {
 	currentVoltage = voltage;
+	int shiftNumber = shiftOff;
+	switch (voltage) {
+		case 1: // onePointEight
+			shiftNumber = shift18V;
+			break;
+		case 2: // threePointThree
+			shiftNumber = shift33V;
+			break;
+		case 3: // five
+			shiftNumber = shift50V;
+			break;
+	}
+
+	// Use bit shifter to activate the proper voltage regulator
+	digitalWrite(shifterLatchPin, LOW);
+    shiftOut(shifterDataPin, shifterClockPin, MSBFIRST, shiftNumber);
+    digitalWrite(shifterLatchPin, HIGH);
 }
 
 void Config::setTimeout(timeout aTimeout) {
diff --git a/Universal_Serial_Adapter/Config.h b/Universal_Serial_Adapter/Config.h
index 53bc94d..54fbd94 100644
--- a/Universal_Serial_Adapter/Config.h
+++ b/Universal_Serial_Adapter/Config.h
@@ -22,7 +22,10 @@ private:
 	timeout currentTimeout;
 	bool uiEnabled;
 
-
+	const static int shiftOff = 0;
+	const static int shift18V = 1;
+	const static int shift33V = 2;
+	const static int shift50V = 4;
 
 public:
 	Config();
diff --git a/Universal_Serial_Adapter/Project.h b/Universal_Serial_Adapter/Project.h
index df00414..f1b09b3 100644
--- a/Universal_Serial_Adapter/Project.h
+++ b/Universal_Serial_Adapter/Project.h
@@ -13,20 +13,27 @@
 
 #define DEBUG true // For controlling debug output via serial
 
-// Pinout / things that need configuration
+// Buttons / Joystick / Input Hardware Pinouts
 #define okButtonPin     22
 #define okButtonLed     23
 #define cancelButtonPin 24
 #define cancelButtonLed 25
 #define pspXPin         0 // After GND / @ edge
 #define pspYPin         1 // Between VCC and gnd
-// LCD Pinouts
+
+// LCD Pinout
 #define LCD_LITE 26 // Backlight pin
 #define SD_CS    7  // Chip select line for SD card
 #define LCD_CS  53  // Chip select line for TFT display
 #define LCD_DC   9  // Data/command line for TFT
 #define LCD_RST  8  // Reset line for TFT (or connect to +5V)
 
+// 74HC595 Bit Shifter Pinout
+#define shifterLatchPin 2 //Pin connected to ST_CP of 74HC595
+#define shifterClockPin 5 //Pin connected to SH_CP of 74HC595
+#define shifterDataPin  4 //Pin connected to DS of 74HC595
+
+// Colors / theme of UI
 #define SPLASH_BACKGROUND ST7735_WHITE
 #define BACKGROUND        ST7735_BLACK
 #define TEXT              ST7735_WHITE