initial cleanup and mapping

wiringPi/mcp23x08.h

@@ -0,0 +1,73 @@
+/*
+ * mcp23x17:
+ *	Copyright (c) 2012-2013 Gordon Henderson
+ *
+ *	Header file for code using the MCP23x17 GPIO expander chip.
+ *	This comes in 2 flavours: MCP23017 which has an I2C interface,
+ *	an the MXP23S17 which has an SPI interface.
+ ***********************************************************************
+ * This file is part of wiringPi:
+ *	https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ *    wiringPi is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as
+ *    published by the Free Software Foundation, either version 3 of the
+ *    License, or (at your option) any later version.
+ *
+ *    wiringPi is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public
+ *    License along with wiringPi.
+ *    If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+
+// MCP23x17 Registers
+
+#define	IODIRA		0x00
+#define	IPOLA		0x02
+#define	GPINTENA	0x04
+#define	DEFVALA		0x06
+#define	INTCONA		0x08
+#define	IOCON		0x0A
+#define	GPPUA		0x0C
+#define	INTFA		0x0E
+#define	INTCAPA		0x10
+#define	GPIOA		0x12
+#define	OLATA		0x14
+
+#define	IODIRB		0x01
+#define	IPOLB		0x03
+#define	GPINTENB	0x05
+#define	DEFVALB		0x07
+#define	INTCONB		0x09
+#define	IOCONB		0x0B
+#define	GPPUB		0x0D
+#define	INTFB		0x0F
+#define	INTCAPB		0x11
+#define	GPIOB		0x13
+#define	OLATB		0x15
+
+// Bits in the IOCON register
+
+#define	IOCON_UNUSED	0x01
+#define	IOCON_INTPOL	0x02
+#define	IOCON_ODR	0x04
+#define	IOCON_HAEN	0x08
+#define	IOCON_DISSLW	0x10
+#define	IOCON_SEQOP	0x20
+#define	IOCON_MIRROR	0x40
+#define	IOCON_BANK_MODE	0x80
+
+// Default initialisation mode
+
+#define	IOCON_INIT	(IOCON_SEQOP)
+
+// SPI Command codes
+
+#define	CMD_WRITE	0x40
+#define CMD_READ	0x41