Diff: SCP1000.cpp

Revision:

1:1b2027cbe629

Parent:

0:a224293d7af4

--- a/SCP1000.cpp	Tue Sep 16 13:07:04 2014 +0000
+++ b/SCP1000.cpp	Thu Sep 18 13:09:39 2014 +0000
@@ -1,18 +1,18 @@
 /* Copyright (c) 2014 Shigenori Inoue, MIT License
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
- * and associated documentation files (the "Software"), to deal in the Software without restriction, 
- * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
- * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
- * The above copyright notice and this permission notice shall be included in all copies or 
+ * The above copyright notice and this permission notice shall be included in all copies or
  * substantial portions of the Software.
  *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
- * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
@@ -186,6 +186,14 @@
 {
     int temp_raw;
     temp_raw = read16(TEMPOUT);
+
+    /* Check the below-zero temperature */
+    if ((temp_raw | 0x2000) == 1) {
+        temp_raw ^= 0x2000;
+        temp_raw = -temp_raw;
+    }
+
+    /* Return the temperature as float */
     return static_cast<float>(temp_raw) * 0.05;
 }
 
@@ -196,5 +204,7 @@
     int press_raw_l;
     press_raw_h = read8(DATARD8);
     press_raw_l = read16(DATARD16);
+    
+    /* Return the atmospheric pressure as float */
     return static_cast<float>((press_raw_h << 16) + press_raw_l) * 0.0025;
 }
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