From 8f9652cfb3f9be74bb9de3c097e5cf316737d21b Mon Sep 17 00:00:00 2001
From: Stanley Huang <stanleyhuangyc@gmail.com>
Date: Sun, 29 Jun 2014 21:18:09 +1000
Subject: Add clearDTC()

---
 libraries/OBD/OBD.cpp |  8 +++++++-
 libraries/OBD/OBD.h   | 23 +++++++++++++++++++----
 2 files changed, 26 insertions(+), 5 deletions(-)

(limited to 'libraries/OBD')

diff --git a/libraries/OBD/OBD.cpp b/libraries/OBD/OBD.cpp
index 85e3ed0..172730e 100644
--- a/libraries/OBD/OBD.cpp
+++ b/libraries/OBD/OBD.cpp
@@ -75,6 +75,12 @@ bool COBD::read(byte pid, int& result)
 	return getResult(pid, result);
 }
 
+void COBD::clearDTC()
+{
+	write("04\r");
+	receive(0, 1000);
+}
+
 bool COBD::available()
 {
 	return OBDUART.available();
@@ -119,7 +125,7 @@ int COBD::normalizeData(byte pid, char* data)
 	case PID_THROTTLE:
 	case PID_COMMANDED_EGR:
 	case PID_COMMANDED_EVAPORATIVE_PURGE:
-	case PID_FUEL_LEVEL_INPUT:
+	case PID_FUEL_LEVEL:
 	case PID_RELATIVE_THROTTLE_POS:
 	case PID_ABSOLUTE_THROTTLE_POS_B:
 	case PID_ABSOLUTE_THROTTLE_POS_C:
diff --git a/libraries/OBD/OBD.h b/libraries/OBD/OBD.h
index d2a9eb1..d47c3d3 100644
--- a/libraries/OBD/OBD.h
+++ b/libraries/OBD/OBD.h
@@ -44,7 +44,7 @@
 #define PID_COMMANDED_EGR 0x2C
 #define PID_EGR_ERROR 0x2D
 #define PID_COMMANDED_EVAPORATIVE_PURGE 0x2E
-#define PID_FUEL_LEVEL_INPUT 0x2F
+#define PID_FUEL_LEVEL 0x2F
 #define PID_WARMS_UPS 0x30
 #define PID_DISTANCE 0x31
 #define PID_EVAP_SYS_VAPOR_PRESSURE 0x32
@@ -89,23 +89,38 @@ public:
 	COBD():dataMode(1),errors(0),m_state(OBD_DISCONNECTED) {}
 	/*
        Serial baudrate is only adjustable for Arduino OBD-II Adapters V2
-       Check out http://arduinodev.com/hardware/obd-kit/
+       Check out http://freematics.com/pages/products/arduino-obd-adapter
 	*/
 	virtual void begin(unsigned long baudrate = 0);
+	// initialize OBD-II connection
 	virtual bool init(byte protocol = 0);
+	// un-initialize OBD-II connection
 	virtual void uninit();
+	// get connection state
+	byte getState() { return m_state; }
+	// read specified OBD-II PID value
 	virtual bool read(byte pid, int& result);
+	// set device into 
 	virtual void sleep();
+	// wake up device from previous sleep
 	virtual void wakeup();
+	// set working protocol (default auto)
 	virtual void setProtocol(byte h = -1);
-	// Query and GetResponse for advanced usage only
+	// clear diagnostic trouble code
+	virtual void clearDTC();
+	// send query for specified PID
 	virtual void sendQuery(byte pid);
+	// retrive and parse the response of specifie PID 
 	virtual bool getResult(byte& pid, int& result);
+	// determine if the PID is supported
 	bool isValidPID(byte pid);
-	byte getState() { return m_state; }
+	// set current PID mode
 	byte dataMode;
+	// occurrence of errors
 	byte errors;
+	// bit map of supported PIDs
 	byte pidmap[4 * 4];
+	// current VIN
 	byte vin[17];
 protected:
 	virtual char* getResponse(byte& pid, char* buffer);
-- 
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