Diff: MCP23S17.cpp

Revision:

7:53498e24592c

Parent:

6:7b5e59c0e71c

Child:

8:841b19734955

--- a/MCP23S17.cpp	Sun Aug 22 12:41:26 2010 +0000
+++ b/MCP23S17.cpp	Sun Aug 22 15:37:25 2010 +0000
@@ -1,64 +1,97 @@
-/* MCP23S17 - drive the Microchip MCP23S17 16-bit Port Extender using SPI
-* Copyright (c) 2010 Romilly Cocking
-* Released under the MIT License: http://mbed.org/license/mit
-*
-* version 0.1
-*/
-
-#include "mbed.h"
-#include "MCP23S17.h"
-
-MCP23S17::MCP23S17(SPI& spi, PinName ncs, char writeOpcode) : _spi(spi), _ncs(ncs) {
-    _writeOpcode = writeOpcode;
-    _readOpcode = _writeOpcode | 1; // low order bit = 1 for read
-    _init();
-}
-
-char MCP23S17::_read(char address) {
-    _ncs = 0;
-    _spi.write(_readOpcode);
-    _spi.write(address);
-    char result = _spi.write(0);
-    _ncs = 1;
-    return result;
-}
-
-void MCP23S17::_write(char address, char data) {
-    _ncs = 0;
-    _spi.write(_writeOpcode);
-    _spi.write(address);
-    _spi.write(data);
-    _ncs = 1;
-}
-
-void MCP23S17::_init() {
-    _write(IOCON, (IOCON_BYTE_MODE | IOCON_HAEN )); // Hardware addressing on, operations toggle between A and B registers
-}
-
-void MCP23S17::directionA(char direction) {
-    _write(IODIRA, direction);
-}
-
-void MCP23S17::directionB(char direction) {
-    _write(IODIRB, direction);
-}
-
-void  MCP23S17::gpIntEnA(char interruptsEnabledMask) {
-    _write(GPINTENA, interruptsEnabledMask);
-}
-
-void MCP23S17::outputA(char byte) {
-    _write(OLATA, byte);
-}
-
-void MCP23S17::outputB(char byte) {
-    _write(OLATB, byte);
-}
-
-char MCP23S17::inputA() {
-    return _read(GPIOA);
-}
-
-char MCP23S17::inputB() {
-    return _read(GPIOB);
-}
+/* MCP23S17 - drive the Microchip MCP23S17 16-bit Port Extender using SPI
+* Copyright (c) 2010 Romilly Cocking
+* Released under the MIT License: http://mbed.org/license/mit
+*
+* version 0.2
+*/
+
+#include "mbed.h"
+#include "MCP23S17.h"
+
+MCP23S17::MCP23S17(SPI& spi, PinName ncs, char writeOpcode) : _spi(spi), _ncs(ncs) {
+    _writeOpcode = writeOpcode;
+    _readOpcode = _writeOpcode | 1; // low order bit = 1 for read
+    _init();
+}
+
+char MCP23S17::_read(char address) {
+    _ncs = 0;
+    _spi.write(_readOpcode);
+    _spi.write(address);
+    char result = _spi.write(0);
+    _ncs = 1;
+    return result;
+}
+
+void MCP23S17::_write(char address, char data) {
+    _ncs = 0;
+    _spi.write(_writeOpcode);
+    _spi.write(address);
+    _spi.write(data);
+    _ncs = 1;
+}
+
+void MCP23S17::_init() {
+    _write(IOCON, (IOCON_BYTE_MODE | IOCON_HAEN )); // Hardware addressing on, operations toggle between A and B registers
+}
+
+void MCP23S17::directionA(char direction) {
+    _write(IODIRA, direction);
+}
+
+void MCP23S17::directionB(char direction) {
+    _write(IODIRB, direction);
+}
+
+void MCP23S17::interruptEnableA(char interruptsEnabledMask) {
+    _write(GPINTENA, interruptsEnabledMask);
+}
+
+void MCP23S17::interruptEnableB(char interruptsEnabledMask) {
+    _write(GPINTENB, interruptsEnabledMask);
+}
+
+void MCP23S17::mirrorInterrupts(bool mirror) {
+ char iocon = _read(IOCON);
+    if (mirror) {
+        iocon = iocon | INTERRUPT_MIRROR_BIT;
+    } else {
+        iocon = iocon & ~INTERRUPT_MIRROR_BIT;
+    }
+    _write(IOCON, iocon);
+
+}
+
+void  MCP23S17::interruptPolarity(Polarity polarity) {
+    char iocon = _read(IOCON);
+    if (polarity == ACTIVE_LOW) {
+        iocon = iocon & ~INTERRUPT_POLARITY_BIT;
+    } else {
+        iocon = iocon | INTERRUPT_POLARITY_BIT;
+    }
+    _write(IOCON, iocon);
+}
+
+void MCP23S17::defaultValueA(char valuesToCompare) {
+    _write(DEFVALA, valuesToCompare);
+}
+
+void MCP23S17::interruptControlA(char interruptContolBits) {
+    _write(INTCONA, interruptContolBits);
+}
+
+void MCP23S17::outputA(char byte) {
+    _write(OLATA, byte);
+}
+
+void MCP23S17::outputB(char byte) {
+    _write(OLATB, byte);
+}
+
+char MCP23S17::inputA() {
+    return _read(GPIOA);
+}
+
+char MCP23S17::inputB() {
+    return _read(GPIOB);
+}