Diff: measurement/Temperature.cpp

Revision:

123:311fa85af2b3

Parent:

117:e831cdb799ab

Child:

136:a52821cdb108

--- a/measurement/Temperature.cpp	Wed May 27 09:22:24 2015 +0000
+++ b/measurement/Temperature.cpp	Fri May 29 12:05:01 2015 +0000
@@ -8,6 +8,14 @@
 // Timeout for forcing a sending even if readings are similar [seconds].
 #define TIME_LIMIT_TEMP 900
 
+static inline bool valueChanged(float V0, float V1)
+{
+        if (abs(V0-V1) <= abs(V0)*THRESHOLD_PERCENT_TEMP)
+                return false;
+        else
+                return true;
+}
+
 size_t Temperature::read(char *buf, size_t maxLen, char *status, size_t num)
 {
         static const char *fmt = "105,%ld,%f\r\n";
@@ -15,17 +23,15 @@
                 return 0;
 
         float data = sensor.temp();
-        if (abs(oldValue-data) <= abs(oldValue)*THRESHOLD_PERCENT_TEMP) {
-                time_t t_interval = time(NULL) - t_start;
-                if (t_interval < TIME_LIMIT_TEMP) {
-                        return 0;
-                }
+        float t_interval = timer.read();
+        if (!valueChanged(oldValue, data) && t_interval < TIME_LIMIT_TEMP) {
+                return 0;
         }
         size_t l = snprintf(buf, maxLen, fmt, deviceID, data);
         if (status) {
                 snprintf(status, num, "Send Temp %.2f", data);
         }
         oldValue = data;
-        t_start = time(NULL);
+        timer.reset();
         return l;
 }
\ No newline at end of file