Tedd OKANO
/
test_LM75B_Hello
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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 );
+}