Xinlei Cao / Mbed 2 deprecated MbedSmartRestMain

Own fork of MbedSmartRestMain

Dependencies:   C027_Support C12832 LM75B MMA7660 MbedSmartRest mbed-rtos mbed

Fork of MbedSmartRestMain by Cumulocity Official

measurement/Temperature.cpp@123:311fa85af2b3, 2015-05-29 (annotated)

Committer:
xinlei
Date:
Fri May 29 12:05:01 2015 +0000
Revision:
123:311fa85af2b3
Parent:
117:e831cdb799ab
Child:
136:a52821cdb108
measurement: revert timing to use timer to avoid negative time after long run

Who changed what in which revision?

UserRevisionLine numberNew contents of line
xinlei 100:dbcd3bc51758 1 #include <stdio.h>
xinlei 100:dbcd3bc51758 2 #include "Temperature.h"
xinlei 100:dbcd3bc51758 3 #include "SmartRestConf.h"
xinlei 100:dbcd3bc51758 4 #include "logging.h"
xinlei 100:dbcd3bc51758 5
xinlei 100:dbcd3bc51758 6 // Cut-off for avoiding sending similar sensor reading.
xinlei 100:dbcd3bc51758 7 #define THRESHOLD_PERCENT_TEMP 0.02
xinlei 100:dbcd3bc51758 8 // Timeout for forcing a sending even if readings are similar [seconds].
xinlei 100:dbcd3bc51758 9 #define TIME_LIMIT_TEMP 900
xinlei 100:dbcd3bc51758 10
xinlei 123:311fa85af2b3 11 static inline bool valueChanged(float V0, float V1)
xinlei 123:311fa85af2b3 12 {
xinlei 123:311fa85af2b3 13 if (abs(V0-V1) <= abs(V0)*THRESHOLD_PERCENT_TEMP)
xinlei 123:311fa85af2b3 14 return false;
xinlei 123:311fa85af2b3 15 else
xinlei 123:311fa85af2b3 16 return true;
xinlei 123:311fa85af2b3 17 }
xinlei 123:311fa85af2b3 18
xinlei 100:dbcd3bc51758 19 size_t Temperature::read(char *buf, size_t maxLen, char *status, size_t num)
xinlei 100:dbcd3bc51758 20 {
xinlei 100:dbcd3bc51758 21 static const char *fmt = "105,%ld,%f\r\n";
xinlei 100:dbcd3bc51758 22 if (!deviceReady)
xinlei 100:dbcd3bc51758 23 return 0;
xinlei 100:dbcd3bc51758 24
xinlei 100:dbcd3bc51758 25 float data = sensor.temp();
xinlei 123:311fa85af2b3 26 float t_interval = timer.read();
xinlei 123:311fa85af2b3 27 if (!valueChanged(oldValue, data) && t_interval < TIME_LIMIT_TEMP) {
xinlei 123:311fa85af2b3 28 return 0;
xinlei 100:dbcd3bc51758 29 }
xinlei 100:dbcd3bc51758 30 size_t l = snprintf(buf, maxLen, fmt, deviceID, data);
xinlei 100:dbcd3bc51758 31 if (status) {
xinlei 100:dbcd3bc51758 32 snprintf(status, num, "Send Temp %.2f", data);
xinlei 100:dbcd3bc51758 33 }
xinlei 100:dbcd3bc51758 34 oldValue = data;
xinlei 123:311fa85af2b3 35 timer.reset();
xinlei 100:dbcd3bc51758 36 return l;
xinlei 100:dbcd3bc51758 37 }