Diff: TestTemperature.cpp

Revision:

2:2f4b7535ceb3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TestTemperature.cpp	Thu Aug 28 09:36:13 2014 +0000
@@ -0,0 +1,78 @@
+/*
+ *  Copyright 2013 Embedded Artists AB
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/******************************************************************************
+ * Includes
+ *****************************************************************************/
+
+#include "mbed.h"
+#include "TestTemperature.h"
+#include "LM75B.h"
+
+/******************************************************************************
+ * Defines and typedefs
+ *****************************************************************************/
+
+#define MIN_TEMP  (15.0f)
+#define MAX_TEMP  (45.0f)
+
+/******************************************************************************
+ * Public Functions
+ *****************************************************************************/
+
+/*
+   Prerequisites:
+ 
+   - For this test to work jumpers JP8 and JP9 on the LPC4088 Experiment Base Board
+     must both be in positions 1-2
+*/
+
+bool TestTemperature::runTest() {
+    //Create an LM75B object at 0x92/0x93 (ADDRESS_1)
+    LM75B sensor(P0_27, P0_28, LM75B::ADDRESS_1);
+
+    printf("Testing LM75 temperature sensor...\n");
+
+    // Test waits up to 5 seconds, sampling the temperature twice per second,
+    // for the sensor to produce a value in the MIN_TEMP to MAX_TEMP range.
+    
+    if (sensor.open()) {
+        printf("LM75 Device detected!\n");
+ 
+        int i = 10;
+        while (i--) {
+            float f = (float)sensor;
+
+            printf("Temp = %.3f\n", f);
+ 
+            if ((f >= MIN_TEMP) && (f <= MAX_TEMP)) {
+                printf("Temp in %.3f..%.3f range - test passed\n", MIN_TEMP, MAX_TEMP);
+                return true;
+            }
+            
+            //Sleep for 0.5 seconds
+            wait(0.5);
+        }
+        if (i == 0) {
+            printf("LM75 No temp in range %.3f..%.3f!\n", MIN_TEMP, MAX_TEMP);
+        }
+    } else {
+        printf("LM75 Device not detected!\n");
+    }  
+    return false;
+}
+
+