Own fork of MbedSmartRestMain
Dependencies: C027_Support C12832 LM75B MMA7660 MbedSmartRest mbed-rtos mbed
Fork of MbedSmartRestMain by
Signal.cpp
00001 #include <stdio.h> 00002 #include "Signal.h" 00003 #include "SmartRestConf.h" 00004 #include "LCDDisplay.h" 00005 #include "DeviceInfo.h" 00006 #include "logging.h" 00007 00008 // Cut-off for avoiding sending similar sensor reading. 00009 #define THRESHOLD_PERCENT_SIG 0.06 00010 // Timeout for forcing a sending even if readings are similar [seconds]. 00011 #define TIME_LIMIT_SIG 900 00012 00013 static inline bool valueChanged(int *V0, int *V1) 00014 { 00015 if (abs(V0[0]-V1[0]) <= abs(V0[0])*THRESHOLD_PERCENT_SIG && 00016 abs(V0[1]-V1[1]) <= abs(V0[1])*THRESHOLD_PERCENT_SIG) 00017 return false; 00018 else 00019 return true; 00020 } 00021 00022 int Signal::read(char *buf, size_t maxLen, char *status, size_t num) 00023 { 00024 static const char *fmt = "104,%ld,%d,%d\r\n"; 00025 static char signal[27] = {0}; 00026 DeviceInfo::SignalQuality *p = deviceInfo.signalQuality(); 00027 00028 if (p && p->rssi) 00029 snprintf(signal, sizeof(signal), "Network: %d dBm", p->rssi); 00030 else 00031 strncpy(signal, "Network: no coverage", sizeof(signal)); 00032 if (strcmp(LCDDisplay::inst().getSecondLine(), signal)) { 00033 LCDDisplay::inst().setSecondLine(signal); 00034 } 00035 if (p == NULL || p->rssi == 0) 00036 return -1; 00037 00038 int data[2] = { p->rssi, p->ber }; 00039 float t_interval = timer.read(); 00040 if (!valueChanged(oldValues, data) && t_interval < TIME_LIMIT_SIG) { 00041 return 0; 00042 } 00043 00044 size_t l = snprintf(buf, maxLen, fmt, deviceID, data[0], data[1]); 00045 if (status) { 00046 snprintf(status, num, "Send dBm %d,%d", data[0], data[1]); 00047 } 00048 oldValues[0] = data[0]; 00049 oldValues[1] = data[1]; 00050 timer.reset(); 00051 return l; 00052 }
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