Diff: NXP_LM75B.h

Revision:

0:f3a57ebcadba

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/NXP_LM75B.h	Sat Jun 05 04:03:39 2010 +0000
@@ -0,0 +1,99 @@
+/*
+ *  I2C digital temperature sensor "LM75B" library
+ *
+ *  LM75B is an I2C based digital temperature sensor
+ *  http://www.nxp.com/pip/LM75B_2.html
+ *
+ *  This is a library to operate this chip easy.
+ *
+ *  Released under the MIT License: http://mbed.org/license/mit
+ *
+ *  revision 1.0    16-Jan-2010     (a) 1st release
+ *  revision 1.1    23-Jan-2010     (a) class name has been changed from LM75B to NXP_LM75B
+ *                                  (b) copyright notice added
+ *  revision 2.0    05-Jun-2010     (a) demo modified to make the library simple
+ */
+
+#ifndef        MBED_NXP_LM75B
+#define        MBED_NXP_LM75B
+
+
+#include    "mbed.h"
+
+
+//  LM75B IIC address
+const char    LM75B_base_addr = 0x90;
+
+//  LM75B registers
+const char    Conf            = 0x01;
+const char    Temp            = 0x00;
+const char    Tos             = 0x03;
+const char    Thyst           = 0x02;
+
+
+class NXP_LM75B  {
+public:
+
+    NXP_LM75B(    PinName sda, 
+                PinName sdl, 
+                char dev_address = LM75B_base_addr, 
+                char vConf = 0x00, 
+                short vTos  = 0x5000, 
+                short vThyst = 0x4B00 
+             ) 
+             : i2c( sda, sdl ), device_address( dev_address ) 
+    {
+    
+        char    data[ 3 ];
+
+        data[ 0 ]    = Conf;
+        data[ 1 ]    = vConf;
+
+        if ( i2c.write( device_address, data, 2 ) )
+            ;
+
+        data[ 0 ]    = Tos;
+        data[ 1 ]    = (char)(vTos >> 8);
+        data[ 2 ]    = (char)vTos;
+
+        if ( i2c.write( device_address, data, 3 ) )
+            ;
+
+        data[ 0 ]    = Thyst;
+        data[ 1 ]    = (char)(vThyst >> 8);
+        data[ 2 ]    = (char)vThyst;
+
+        if ( i2c.write( device_address, data, 3 ) )
+            ;
+    }
+
+    int temp_short( void ) {
+        char    data[ 2 ];
+
+        data[ 0 ]    = 0;
+
+        if ( i2c.write( device_address, data, 1 ) )
+            ;
+
+        if ( i2c.read( device_address, data, 2 ) )
+            ;
+
+        return ( (((short)data[ 0 ]) << 8 | data[ 1 ]) >> 5 );
+    }
+
+    float temp( void ) {
+        return ( (float)(temp_short()) / 8.0 );
+    }
+
+    operator float( void ) {
+        return( temp() );
+    }
+    
+private:
+    I2C     i2c;
+    char    device_address;
+
+}
+;
+
+#endif
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