Revision 1:9146d773a5a3, committed 2016-06-03

Comitter:

wbeaumont

Date:

Fri Jun 03 16:01:45 2016 +0000

Parent:

0:d829b4edd564

Commit message:

added more functions , tested with hardware using n FRDM_KL05Z)

Changed in this revision

--- a/mcp23009.cpp	Fri Jun 03 12:40:49 2016 +0000
+++ b/mcp23009.cpp	Fri Jun 03 16:01:45 2016 +0000
@@ -2,7 +2,7 @@
 //#include "mbed.h"  // should not be in only for printf debug ?
 
 
-#define VERSION_MCP23009_SRC  "0.10"  
+#define VERSION_MCP23009_SRC  "0.20"  
 
 // definition registers 
 
@@ -29,12 +29,20 @@
     _i2c_interface->write(_device_address, data,2);     
 }
 
+int MCP23009::outp_status( int pinnr){
+    return status_gen(pinnr,OLAT);
+}
+
 int MCP23009::status( int pinnr){
+    return status_gen(pinnr,GPIO);
+}    
+
+int MCP23009::status_gen( int pinnr , char reg){
     int result=0;
-    data[0]=GPIO;
+    data[0]=reg;
     result= _i2c_interface->write(_device_address, data,1); // set reg
     if ( result ) return -1;
-    char rb[0];
+    char rb[1];
     result = _i2c_interface->read(_device_address,rb,1); // read the current status 
     if ( result ) return -2;
     if ( pinnr != 8) {
@@ -96,7 +104,7 @@
     if (pinnr < 8 ) {
         result= _i2c_interface->write(_device_address, data,1); // set to ioreg
         if ( result ) return -1;
-        char rb[0];
+        char rb[1];
         result = _i2c_interface->read(_device_address, rb,1); // read the current status 
         if ( result ) return -2;
         data[1]= 1<<pinnr;

--- a/mcp23009.h	Fri Jun 03 12:40:49 2016 +0000
+++ b/mcp23009.h	Fri Jun 03 16:01:45 2016 +0000
@@ -9,7 +9,7 @@
 #include "I2CInterface.h" 
 #include "DACInterface.h" 
 
-#define VERSION_MCP23009_HDR "0.1"
+#define VERSION_MCP23009_HDR "0.20"
 
 /** MCP23009 class.
  *  Used for interfacing with a mcp23009 8 bit io expander
@@ -18,7 +18,8 @@
  *  This includes the "virtual" I2CInterface class that is the interface to the I2C device 
  *  An implementation of the I2Cinterface class for the MBED can be found at 
  *  interrupt is not supported (yet )
- *  
+ *  V 0.10  initial version
+ *  V 0.20  added outp_status , tested with hardware. 
  * (C) Wim Beaumont Universiteit Antwerpen 2016
  *  
  */
@@ -53,8 +54,22 @@
      *  @return none zero in case of error 
      */
      int set_as_output(int pinnr ,int pullup,int polarity=-1 );   
-     
+    
+    /** read the status of all IO pins and indicate if the pin, with pinnr is  1 or 0
+     *  if pinnr= 8 the status of all pins is returned
+     *  the status is the level of the port not the "output status" ( open drain so output status can be different) 
+     *  @param pinnr : range 0 .. 8  , if 8 the return value is the status of all pins ,if 0 ..7 it returns 0 or 1 
+     *  @return   0 or 1 if pinnr 0..7 ,  byte ( 0 ..255  ) if pinnr =8  neg value in case of I2C error 
+     */
      int status( int pinnr=8);
+     /** read the status of output register all IO pins and indicate if the pin, with pinnr is  1 or 0
+     *  if pinnr= 8 the status of all pins is returned
+     *  the outp_status is the status of the output latch!! not the actual levels on the IO lines 
+     *  @param pinnr : range 0 .. 8  , if 8 the return value is the status of all pins ,if 0 ..7 it returns 0 or 1 
+     *  @return   0 or 1 if pinnr 0..7 ,  byte ( 0 ..255  ) if pinnr =8  neg value in case of I2C error 
+     */
+     int outp_status( int pinnr=8);
+
      int set( int pinnr , int value);
      protected:
     /** pointer to the I2C interface driver. */
@@ -65,6 +80,7 @@
       char data[5];
       int set_io_pin(bool input ,int pinnr,int pullup,  int polarity  );  
       int pinmanipulation ( bool active , int pinnr );
+      int status_gen( int pinnr , char reg);
 };
 
-#endif
\ No newline at end of file
+#endif