Own fork of MbedSmartRestMain
Dependencies: C027_Support C12832 LM75B MMA7660 MbedSmartRest mbed-rtos mbed
Fork of MbedSmartRestMain by
Diff: measurement/Acceleration.cpp
- Revision:
- 100:dbcd3bc51758
- Child:
- 114:c54e9731b9de
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/measurement/Acceleration.cpp Fri May 08 12:19:57 2015 +0000 @@ -0,0 +1,39 @@ +#include <stdio.h> +#include "SmartRestConf.h" +#include "Acceleration.h" +#include "logging.h" + +// Percentage cut-off for avoiding sending similar sensor reading. +#define THRESHOLD_PERCENT_ACCE 0.1 +// Timeout for forcing a sending even if readings are similar [seconds]. +#define TIME_LIMIT_ACCE 900 + +size_t Acceleration::read(char *buf, size_t maxLen, char *status, size_t num) +{ + static const char *fmt = "106,%ld,%f,%f,%f\r\n"; + if (!deviceReady) + return 0; + float data[3] = { 0.0, 0.0, 0.0 }; + sensor.readData(data); + + if ((0.15 > abs(data[0]) || abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_ACCE) && + (0.10 > abs(data[1]) || abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_ACCE)) { + time_t t_interval = time(NULL) - t_start; + if (t_interval < TIME_LIMIT_ACCE) { + return 0; + } else { + aDebug("Acc: Timeout at %d s.\n", t_interval); + } + } + + size_t l = snprintf(buf, maxLen, fmt, deviceID, data[0], data[1], data[2]); + if (status) { + snprintf(status, num, "Send Acc %.1f,%.1f,%.1f", + data[0], data[1], data[2]); + } + oldValues[0] = data[0]; + oldValues[1] = data[1]; + oldValues[2] = data[2]; + t_start = time(NULL); + return l; +} \ No newline at end of file