Wim Huiskamp / MCP23017

Added support for banked registers

Dependents:   Component_Test_Interface FalconWing MX_Spoile_Test Simple_Power_Distribution ... more

Files at this revision

API Documentation at this revision

Revision 3:72da9cd002bd, committed 2011-08-21

Comitter:
wim
Date:
Sun Aug 21 13:59:48 2011 +0000
Parent:
2:2d4ee919e8a7
Child:
4:868db61f5f4e
Commit message:
Fixed problem in _read() method

Changed in this revision

MCP23017.cpp Show annotated file Show diff for this revision Revisions of this file
MCP23017.h Show annotated file Show diff for this revision Revisions of this file 
--- a/MCP23017.cpp	Mon Dec 20 16:04:04 2010 +0000
+++ b/MCP23017.cpp	Sun Aug 21 13:59:48 2011 +0000
@@ -5,6 +5,7 @@
 *
 * version 0.2 Initial Release
 * version 0.3 Cleaned up
+* version 0.4 Fixed problem with _read method
 */
 
 #include "mbed.h"
@@ -13,7 +14,7 @@
 /** 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
+* @param char deviceAddress the address of the MCP23017
 */
 MCP23017::MCP23017(I2C &i2c, char deviceAddress) : _i2c(i2c) {
     _writeOpcode = deviceAddress & 0xFE; // low order bit = 0 for write
@@ -23,24 +24,23 @@
 
 /** Read from specified MCP23017 register
 *
-* @param char address the internal registeraddress of the MSC23017
+* @param char address the internal registeraddress of the MCP23017
 * @returns data from register 
 */
 char MCP23017::_read(char address) {
     char data[2];
-    char result;
 
     data[0] = address;
-    _i2c.write(_writeOpcode, data, 1);      // Select Register for reading
-    result = _i2c.read(_readOpcode);        // Read from selected Register
+    _i2c.write(_writeOpcode, data, 1);     // Select Register for reading
+    _i2c.read(_readOpcode, data, 1);       // Read from selected Register
     
-    return result;
+    return data[0];
 }
 
 
 /** Write to specified MCP23017 register
 *
-* @param char address the internal registeraddress of the MSC23017
+* @param char address the internal registeraddress of the MCP23017
 */
 void MCP23017::_write(char address, char byte) {
     char data[2];

--- a/MCP23017.h	Mon Dec 20 16:04:04 2010 +0000
+++ b/MCP23017.h	Sun Aug 21 13:59:48 2011 +0000
@@ -5,6 +5,7 @@
 *
 * version 0.2 Initial Release
 * version 0.3 Cleaned up
+* version 0.4 Fixed problem with _read method
 */
 #include "mbed.h"
 
@@ -53,7 +54,7 @@
     /** 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
+    * @param char deviceAddress the address of the MCP23017
     */
     MCP23017(I2C &i2c, char deviceAddress);
 
@@ -105,13 +106,13 @@
     
     /** Write to specified MCP23017 register
     *
-    * @param char address the internal registeraddress of the MSC23017
+    * @param char address the internal registeraddress of the MCP23017
     */
     void _write(char address, char byte);
 
     /** Read from specified MCP23017 register
     *
-    * @param char address the internal registeraddress of the MSC23017
+    * @param char address the internal registeraddress of the MCP23017
     * @returns data from register 
     */
     char _read(char address);