Diff: MCP23017.cpp

Revision:

3:72da9cd002bd

Parent:

1:e2edbd61f4d0

Child:

4:868db61f5f4e

diff -r 2d4ee919e8a7 -r 72da9cd002bd MCP23017.cpp
--- 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];