Diff: user_interface/MCP23017.h

Revision:

0:371773dd3dd1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/user_interface/MCP23017.h	Wed May 04 15:41:13 2011 +0000
@@ -0,0 +1,160 @@
+/* MCP23017 - drive the Microchip MCP23017 16-bit Port Extender using I2C
+* Copyright (c) 2010 Wim Huiskamp, Romilly Cocking (original version for SPI)
+*
+* Released under the MIT License: http://mbed.org/license/mit
+*
+* version 0.2 Initial Release
+* version 0.3 Cleaned up
+*/
+#include "mbed.h"
+
+#ifndef  MCP23017_H
+#define  MCP23017_H
+
+// All register addresses assume IOCON.BANK = 0 (POR default)
+#define IODIRA   0x00
+#define IODIRB   0x01
+#define GPINTENA 0x04
+#define GPINTENB 0x05
+#define DEFVALA  0x06
+#define DEFVALB  0x07
+#define INTCONA  0x08
+#define INTCONB  0x09
+#define IOCON    0x0A
+//#define IOCON    0x0B
+#define GPPUA    0x0C
+#define GPPUB    0x0D
+#define INTFA    0x0E
+#define INTFB    0x0F
+#define INTCAPA  0x10
+#define INTCAPB  0x11
+#define GPIOA    0x12
+#define GPIOB    0x13
+#define OLATA    0x14
+#define OLATB    0x15
+
+// Control settings
+#define IOCON_BANK      0x80 // Banked registers for Port A and B
+#define IOCON_BYTE_MODE 0x20 // Disables sequential operation, Address Ptr does not increment
+//   If Disabled and Bank = 0, operations toggle between Port A and B registers
+#define IOCON_HAEN      0x08 // Hardware address enable
+#define IOCON_ODR       0x04 // Open drain, also disables int polarity!
+#define INTERRUPT_POLARITY_BIT 0x02
+#define INTERRUPT_MIRROR_BIT   0x40
+
+#define PORT_DIR_OUT   0x00
+#define PORT_DIR_IN    0xFF
+
+enum Polarity { ACTIVE_LOW , ACTIVE_HIGH };
+enum Port { PORT_A, PORT_B };
+
+extern DigitalOut Busy;
+
+class MCP23017 {
+    FunctionPointer fp;
+    bool posted;
+public:
+    /** Create an MCP23017 object connected to the specified I2C object and using the specified deviceAddress
+    *
+    * @param I2C &i2c the I2C port to connect to
+    * @param char deviceAddress the address of the MSC23017
+    */
+    MCP23017(I2C &i2c, char deviceAddress);
+    MCP23017(const MCP23017& m):_i2c(m._i2c) {
+        printf("copy constructor\n");
+    }
+
+    /** Set I/O direction of specified MCP23017 Port
+    *
+    * @param Port Port address (Port_A or Port_B)
+    * @param char direction pin direction (0 = output, 1 = input)
+    */
+    void direction(Port port, char direction);
+
+    /** Set Pull-Up Resistors on specified MCP23017 Port
+    *
+    * @param Port Port address (Port_A or Port_B)
+    * @param char offOrOn per pin (0 = off, 1 = on)
+    */
+    void configurePullUps(Port port, char offOrOn);
+
+    void interruptEnable(Port port, char interruptsEnabledMask);
+    void interruptPolarity(Polarity polarity);
+    void mirrorInterrupts(bool mirror);
+    void defaultValue(Port port, char valuesToCompare);
+    void interruptControl(Port port, char interruptControlBits);
+
+    /** Read from specified MCP23017 Port
+    *
+    * @param Port Port address (Port_A or Port_B)
+    * @returns data from Port
+    */
+    char read(Port port);
+    int readW(char address);
+    /** Write to specified MCP23017 Port
+    *
+    * @param Port Port address (Port_A or Port_B)
+    * @param char byte data to write
+    */
+    void write(Port port, char byte);
+    void write(Port port, const char *buffer, int len, bool rpt=false);
+    enum i2c_status { i2c_ok, i2c_busy, i2c_nack, i2c_pending};
+    i2c_status _read(char reg, char *data, int size);
+    i2c_status _write(char *data, int size, bool rpt = false);//first element of data is the register address
+    bool testbusy() {
+        __disable_irq();
+        if (busy) {
+            __enable_irq();
+            return true;
+        }
+        busy = true;
+        Busy = 1;
+        __enable_irq();
+        return false;
+    }
+    bool isbusy() {
+        return busy;
+    }
+    void releasebusy() {
+        busy = false;
+        Busy = 0;
+        if (posted) {
+            posted = false;
+            fp.call();
+        }
+    }
+    template<typename T>
+    void post(T *object, void (T::*member)()) {
+        if (posted)
+            return;
+        fp.attach(object, member);
+        posted = true;
+    }
+protected:
+    I2C &_i2c;
+    char _readOpcode;
+    char _writeOpcode;
+    bool busy;
+
+    /** Init MCP23017
+    *
+    * @param
+    * @returns
+    */
+    void _init();
+
+    /** Write to specified MCP23017 register
+    *
+    * @param char address the internal registeraddress of the MSC23017
+    */
+    void _write(char address, char byte);
+
+    /** Read from specified MCP23017 register
+    *
+    * @param char address the internal registeraddress of the MSC23017
+    * @returns data from register
+    */
+    short _read(char address);
+};
+
+#endif
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