From 8e57c683d3d16f1dee320f10c411602ea38ba651 Mon Sep 17 00:00:00 2001
From: Stanley Huang <stanleyhuangyc@gmail.com>
Date: Mon, 25 Mar 2013 00:57:28 +0800
Subject: initial commit

---
 obdlogger/OBD.h | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 obdlogger/OBD.h

(limited to 'obdlogger/OBD.h')

diff --git a/obdlogger/OBD.h b/obdlogger/OBD.h
new file mode 100644
index 0000000..1247c49
--- /dev/null
+++ b/obdlogger/OBD.h
@@ -0,0 +1,84 @@
+/*************************************************************************
+* OBD-II (ELM327) data accessing library for Arduino
+* Distributed under GPL v2.0
+* Copyright (c) 2012 Stanley Huang <stanleyhuangyc@gmail.com>
+* All rights reserved.
+*************************************************************************/
+
+#define OBD_TIMEOUT_SHORT 2000 /* ms */
+#define OBD_TIMEOUT_LONG 7000 /* ms */
+#define OBD_TIMEOUT_INIT 3000 /* ms */
+#define OBD_SERIAL_BAUDRATE 38400
+#define OBD_RECV_BUF_SIZE 48
+
+#ifndef OBDUART
+#ifdef __AVR_ATmega32U4__ /* for Leonardo */
+#define OBDUART Serial1
+#else
+#define OBDUART Serial
+#endif
+#endif
+
+// mode 0 pids
+#define PID_RPM 0x0C
+#define PID_SPEED 0x0D
+#define PID_THROTTLE 0x11
+#define PID_ENGINE_LOAD 0x04
+#define PID_COOLANT_TEMP 0x05
+#define PID_INTAKE_TEMP 0x0F
+#define PID_MAF_FLOW 0x10
+#define PID_ABS_ENGINE_LOAD 0x43
+#define PID_AMBIENT_TEMP 0x46
+#define PID_FUEL_PRESSURE 0x0A
+#define PID_INTAKE_PRESSURE 0x0B
+#define PID_BAROMETRIC 0x33
+#define PID_TIMING_ADVANCE 0x0E
+#define PID_FUEL_LEVEL 0x2F
+#define PID_RUNTIME 0x1F
+#define PID_DISTANCE 0x31
+
+unsigned int hex2uint16(const char *p);
+unsigned char hex2uint8(const char *p);
+
+class COBD
+{
+public:
+    COBD()
+    {
+        dataMode = 1;
+        errors = 0;
+    }
+	bool Init(bool passive = false);
+	bool ReadSensor(byte pid, int& result, bool passive = false);
+	void Sleep(int seconds);
+	// Query and GetResponse for advanced usage only
+	void Query(byte pid);
+	virtual char* GetResponse(byte pid, char* buffer);
+	virtual bool GetResponse(byte pid, int& result);
+	virtual bool GetResponsePassive(byte& pid, int& result);
+	virtual bool DataAvailable();
+	byte dataMode;
+	byte errors;
+	//char recvBuf[OBD_RECV_BUF_SIZE];
+protected:
+    static bool GetParsedData(byte pid, char* data, int& result);
+	static int GetPercentageValue(char* data)
+	{
+		return (int)hex2uint8(data) * 100 / 255;
+	}
+	static int GetLargeValue(char* data)
+	{
+		return hex2uint16(data);
+	}
+	static int GetSmallValue(char* data)
+	{
+		return hex2uint8(data);
+	}
+	static int GetTemperatureValue(char* data)
+	{
+		return (int)hex2uint8(data) - 40;
+	}
+	virtual char ReadData();
+	virtual void WriteData(const char* s);
+	virtual void WriteData(const char c);
+};
-- 
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