Revision 0:46326feade89, committed 2016-04-12

Comitter:

mederic

Date:

Tue Apr 12 09:02:48 2016 +0000

Commit message:

1st realease

Changed in this revision

diff -r 000000000000 -r 46326feade89 MCP9808.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP9808.cpp	Tue Apr 12 09:02:48 2016 +0000
@@ -0,0 +1,60 @@
+#include "MCP9808.h"
+
+//***********************************/************************************
+//                              Constant                                //
+//***********************************/************************************
+#define MCP9808_I2C_ADDR    0x30 //( 18<<1)
+
+#define MCP9808_REG_CONFIG  0x01
+#define MCP9808_REG_TUPPER  0x02
+#define MCP9808_REG_TLOWER  0x03
+#define MCP9808_REG_TCRIT   0x04
+#define MCP9808_REG_TAMB    0x05
+#define MCP9808_REG_MANID   0x06
+#define MCP9808_REG_DEVID   0x07
+#define MCP9808_REG_RESOL   0x08
+
+#define MCP9808_TAMB_MASK   0x0F
+#define MCP9808_SIGN_POS    0x03
+
+//***********************************/************************************
+//                         Constructors                                 //
+//***********************************/************************************
+MCP9808::MCP9808(I2C *i2c, bool a0, bool a1, bool a2):_i2c(i2c)
+{
+    _addr = (MCP9808_I2C_ADDR | (a2<<3) | (a1<<2) | (a0<<1));
+}
+
+float MCP9808::getTemp(void)
+{
+    char reg = MCP9808_REG_TAMB;
+    float ta;
+    char buf[2];
+
+    _i2c->write(_addr, &reg, 1);
+    _i2c->read(_addr, buf, 2);
+    
+    /*
+    if(buf[0] & (1<<MCP9808_SIGN_POS))
+    {
+        buf[0] &= MCP9808_TAMB_MASK;
+        
+        ta = 256 - (buf[0]*16 + buf[1]*0.0625); 
+    }
+    else
+    {
+        buf[0] &= MCP9808_TAMB_MASK;
+        ta = (buf[0]*16 + buf[1]*0.0625);
+    }*/
+    
+    ta = ((buf[0]&MCP9808_TAMB_MASK) << 8) | buf[1];
+    ta /= 16.0;
+    
+    if(buf[0] & (1<<MCP9808_SIGN_POS))
+    {
+        ta -= 256;
+    }
+      
+    return ta;  
+}
+

diff -r 000000000000 -r 46326feade89 MCP9808.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP9808.h	Tue Apr 12 09:02:48 2016 +0000
@@ -0,0 +1,67 @@
+#ifndef MPC9808_H
+#define MPC9808_H
+
+#include "mbed.h"
+
+/** MCP9808 class.
+ *  Used for read MCP9808 ±0.5°C Maximum Accuracy Digital Temperature Sensor
+ *
+ * Example:
+ * @code
+ *#include "mbed.h"
+ *#include "MCP9808.h"
+ *
+ *DigitalOut myled(LED1);
+ *I2C i2cBus(D14,D15);
+ *MCP9808 therm(&i2cBus, true, true, true);
+ *
+ *int main() 
+ *{
+ *   while(1) 
+ *   {
+ *       myled = !myled; // Toggle LED
+ *       wait(0.2); // 200 ms
+ *       printf("Temperature=%03.6f*C\r\n",therm.getTemp());
+ *   }
+ *}
+ * @endcode
+ */  
+class MCP9808
+{
+    public:
+        /** Create MCP9808 instance connected to I2C bus
+        * @param *i2c I2C bus already initialized
+        * @param a0 bool indicate a0 pin state to compute I2C address
+        * @param a1 bool indicate a1 pin state to compute I2C address
+        * @param a2 bool indicate a2 pin state to compute I2C address
+        */
+        MCP9808(I2C *i2c, bool a0=false, bool a1=false, bool a2=false);
+        
+        /**Get MCP9808 abient temperature
+        * @returns temperature [°C]
+        */    
+        float getTemp(void);
+        
+#ifdef MBED_OPERATORS
+    /** An operator shorthand for getTemp()
+     *
+     * The float() operator can be used as a shorthand for getTemp() to simplify common code sequences
+     *
+     * Example:
+     * @code
+     * float x = therm.getTemp();
+     * float x = therm;
+     *
+     * if(therm.getTemp() > 20.25) { ... }
+     * if(therm > 20.25) { ... }
+     * @endcode
+     */
+    operator float(){return getTemp();}
+#endif
+              
+    private:
+        I2C *_i2c;
+        int _addr;
+};
+
+#endif