Diff: MCP9808.cpp

Revision:

0:f8e8cccfd476

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP9808.cpp	Sun Oct 11 18:40:27 2015 +0000
@@ -0,0 +1,41 @@
+#include "MCP9808.h"
+
+MCP9808::MCP9808(PinName sda, PinName scl) : i2c(sda, scl)
+    {
+    } 
+     
+// read temperature from MCP9808    
+float MCP9808::readTemp()
+    {
+        data_write[0] = MCP9808_REG_TEMP;
+        i2c.write(MCP9808_ADDR, data_write, 1, 1); // no stop
+        i2c.read(MCP9808_ADDR, data_read, 2, 0);
+ 
+        if(data_read[0] & 0xE0) {
+            data_read[0] = data_read[0] & 0x1F;  // clear flag bits
+        }
+        if((data_read[0] & 0x10) == 0x10) { // < 0 C
+            data_read[0] = data_read[0] & 0x0F;
+            tempval = 256 - (data_read[0] * 16) + (data_read[1] / 16.0);
+            tempval = tempval * -1;
+        } else { // > 0 C
+            tempval = (data_read[0] * 16) + (data_read[1] / 16.0);
+        }
+        return tempval;
+        }  
+
+void MCP9808::goSleep()
+{
+    data_write[0] = MCP9808_REG_CONF;
+    data_write[1] = 0x01;  // config msb
+    data_write[2] = 0x00;  // config lsb
+    int status = i2c.write(MCP9808_ADDR, data_write, 3, 0);    
+    }
+    
+void MCP9808::wakeUp()
+{
+    data_write[0] = MCP9808_REG_CONF;
+    data_write[1] = 0x00;  // config msb
+    data_write[2] = 0x00;  // config lsb
+    int status = i2c.write(MCP9808_ADDR, data_write, 3, 0);    
+    }
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