Diff: main.cpp

Revision:

0:f947ed831c67

Child:

1:3c29c04cfeb2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Nov 03 00:03:55 2014 +0000
@@ -0,0 +1,48 @@
+#include "mbed.h"
+
+//  LM75B I2C slave address
+#define     ADDRESS_LM75B   0x90
+
+//  LM75B registers
+#define     LM75B_Conf      0x01
+#define     LM75B_Temp      0x00
+#define     LM75B_Tos       0x03
+#define     LM75B_Thyst     0x02
+
+I2C     i2c( p28, p27 );
+
+void    init( void );
+float   read_temp( void );
+
+
+int main()
+{
+    init();
+
+    while(1) {
+        printf( "temp = %7.3f\r\n", read_temp() );
+        wait( 1 );
+    }
+}
+
+void init( void )
+{
+    char    command[ 2 ];
+
+    command[ 0 ]    = LM75B_Conf;
+    command[ 1 ]    = 0x00;
+
+    i2c.write( ADDRESS_LM75B, command, 2 );
+}
+
+float read_temp( void )
+{
+    char    command[ 2 ];
+
+    command[ 0 ]    = LM75B_Temp;
+
+    i2c.write( ADDRESS_LM75B, command, 1 );  // Send command string
+    i2c.read(  ADDRESS_LM75B, command, 2 );  // read two bytes data
+
+    return ( (float)( (command[ 0 ] << 8)| command[1] ) / 256.0 );
+}