Tedd OKANO
/
TempSensor_LM75B
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Revision 0:b1a5601983d4, committed 2010-01-23
- Comitter:
- okano
- Date:
- Sat Jan 23 13:45:00 2010 +0000
- Commit message:
Changed in this revision
diff -r 000000000000 -r b1a5601983d4 I2cBusDevice.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/I2cBusDevice.h Sat Jan 23 13:45:00 2010 +0000
@@ -0,0 +1,58 @@
+/*
+ * I2C device base class
+ *
+ * A base class for all I2C devices.
+ * This manages the device address and transfers
+ *
+ * Copyright (c) 2010 Tedd OKANO
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * revision 1.0 15-Jan-2010 a. 1st release
+ * revision 1.1 23-Jan-2010 a. The word "MBED_I2cBusDevice" is used instead of _I2cBusDevice_ to avoid symbol conflict
+ * b. copyright notice added
+ */
+
+#ifndef MBED_I2cBusDevice
+#define MBED_I2cBusDevice
+
+#include "mbed.h"
+
+class I2cBusDevice {
+public:
+
+ I2cBusDevice( I2C *i2c, char dev_address ) {
+ bus = i2c;
+ device = dev_address;
+ }
+
+ ~I2cBusDevice() {
+ }
+
+ int write( char *data, int length ) {
+ return ( bus->write( device, data, length) );
+ }
+
+ int read( char *data, int length ) {
+ return ( bus->read( device, data, length) );
+ }
+
+ int read( char reg_ptr, char *data, int length ) {
+ if ( bus->write( device, ®_ptr, 1 ) )
+ return ( 1 );
+
+ if ( bus->read( device, data, length ) )
+ return ( 1 );
+
+ return ( 0 );
+ }
+
+protected:
+ I2C *bus;
+ char device;
+
+private:
+ static char i2c_error;
+}
+;
+
+#endif
diff -r 000000000000 -r b1a5601983d4 TempSensor_LM75B.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TempSensor_LM75B.h Sat Jan 23 13:45:00 2010 +0000
@@ -0,0 +1,94 @@
+/*
+ * 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.
+ *
+ * Copyright (c) 2010 Tedd OKANO
+ * 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 TempSensor_LM75B
+ * b. copyright notice added
+ */
+
+#ifndef MBED_TempSensor_LM75B
+#define MBED_TempSensor_LM75B
+
+
+#include "mbed.h"
+#include "I2cBusDevice.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 TempSensor_LM75B : I2cBusDevice {
+public:
+
+ TempSensor_LM75B( I2C *i2c, char dev_address = LM75B_base_addr, char vConf = 0x00, short vTos = 0x5000, short vThyst = 0x4B00 ) : I2cBusDevice( i2c, dev_address ) {
+ char data[ 3 ];
+
+ data[ 0 ] = Conf;
+ data[ 1 ] = vConf;
+
+ if ( write( data, 2 ) )
+ ;
+
+ data[ 0 ] = Tos;
+ data[ 1 ] = (char)(vTos >> 8);
+ data[ 2 ] = (char)vTos;
+
+ if ( write( data, 3 ) )
+ ;
+
+ data[ 0 ] = Thyst;
+ data[ 1 ] = (char)(vThyst >> 8);
+ data[ 2 ] = (char)vThyst;
+
+ if ( write( data, 3 ) )
+ ;
+ }
+
+ ~TempSensor_LM75B() {
+ }
+
+ int temp_short( void ) {
+ char data[ 2 ];
+
+ if ( read( Temp, data, 2 ) )
+ return ( 1e6 );
+
+ return ( (((short)data[ 0 ]) << 8 | data[ 1 ]) >> 5 );
+ }
+
+ float temp( void ) {
+ return ( (float)(temp_short()) / 8.0 );
+ }
+
+ operator float( void ) {
+ return( temp() );
+ }
+
+#if 0
+ operator short( void ) {
+ return( temp_short() );
+ }
+#endif
+
+
+
+private:
+}
+;
+
+#endif
\ No newline at end of file
diff -r 000000000000 -r b1a5601983d4 TempSensor_LM75B_test.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TempSensor_LM75B_test.cpp Sat Jan 23 13:45:00 2010 +0000
@@ -0,0 +1,53 @@
+/*
+ * I2C digital temperature sensor "LM75B" library test app
+ *
+ * LM75B is an I2C based digital temperature sensor
+ * http://www.nxp.com/pip/LM75B_2.html
+ *
+ * Expecting to use the pins 9 and 10 for I2C bus
+ * these pins should be pulled-up properly.
+ *
+ * The temperature read out will be shown on terminal on the PC screen.
+ *
+ * In this demo code, two LM75B devices can be driven.
+ * These two devices should have different I2C address setting
+ * using its address pins (LM75B's A0 to A2 (pins 5 to 7)).
+ * One LM75B should have all those pins tied to GND.
+ * And another should have the pin A0(pin7) pulled-up.
+ *
+ * From the software, those devices can be accessed by I2C addresses
+ * "0x90" and "0x92".
+ * It will not be as "0x90" and "0x91" because the address has
+ * 7 bit only and stuffed to left. So the "A0" setting become 0xX2.
+ * The LSB does not care because it will be set by I2C libraly when
+ * it transfer the data for read and write.
+ *
+ * This code is new version that can handle the LM75B are the objects.
+ *
+ * Copyright (c) 2010 Tedd OKANO
+ * 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 TempSensor_LM75B
+ * b. copyright notice added
+ */
+
+#include "mbed.h"
+#include "TempSensor_LM75B.h"
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+I2C i2c( p9, p10 ); // sda, scl
+
+TempSensor_LM75B thermo_sensor_0( &i2c ); // sensor_0 using with default I2C address "0x90".
+TempSensor_LM75B thermo_sensor_1( &i2c, 0x92 ); // sensor_1 gaved I2C address since that address pin A0=HIGH.
+
+int main() {
+ int i = 0;
+
+ while (1) {
+ pc.printf( " (%d) sensor_0= %4.1f, sensor_1= %4.1f(degree-C)\n", i++, (float)thermo_sensor_0, (float)thermo_sensor_1 );
+ wait( 1 );
+ }
+}
+
diff -r 000000000000 -r b1a5601983d4 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Jan 23 13:45:00 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0