Fix #448: AS923, AU915 enforce dwell time based on TxParam

Author: terrillmoore

src/lmic/lmic_as923.c

@@ -370,15 +370,28 @@ LMICas923_initJoinLoop(void) {
 void
 LMICas923_updateTx(ostime_t txbeg) {
         u4_t freq = LMIC.channelFreq[LMIC.txChnl];
+        u4_t dwellDelay;
+        u4_t globalDutyDelay;
+
         // Update global/band specific duty cycle stats
         ostime_t airtime = calcAirTime(LMIC.rps, LMIC.dataLen);
         // Update channel/global duty cycle stats
         xref2band_t band = &LMIC.bands[freq & 0x3];
         LMIC.freq = freq & ~(u4_t)3;
         LMIC.txpow = LMICas923_getMaxEIRP(LMIC.txParam);
         band->avail = txbeg + airtime * band->txcap;
-        if (LMIC.globalDutyRate != 0)
-                LMIC.globalDutyAvail = txbeg + (airtime << LMIC.globalDutyRate);
+        dwellDelay = globalDutyDelay = 0;
+        if (LMIC.globalDutyRate != 0) {
+                globalDutyDelay = (airtime << LMIC.globalDutyRate);
+        }
+        if (LMICas923_getUplinkDwellBit(LMIC.txParam)) {
+                dwellDelay = AS923_UPLINK_DWELL_TIME_osticks;
+        }
+        if (dwellDelay > globalDutyDelay) {
+                globalDutyDelay = dwellDelay;
+        }
+        if (globalDutyDelay != 0)
+                LMIC.globalDutyAvail = txbeg + globalDutyDelay;
 }
 
 

src/lmic/lmic_au921.c

@@ -239,10 +239,23 @@ void LMICau921_updateTx(ostime_t txbeg) {
                 LMIC.freq = AU921_500kHz_UPFBASE + (chnl - 64)*AU921_500kHz_UPFSTEP;
         }
 
-        // Update global duty cycle stats
+        // Update global duty cycle stat and deal with dwell time.
+        u4_t dwellDelay;
+        u4_t globalDutyDelay;
+        dwellDelay = globalDutyDelay = 0;
+
         if (LMIC.globalDutyRate != 0) {
                 ostime_t airtime = calcAirTime(LMIC.rps, LMIC.dataLen);
-                LMIC.globalDutyAvail = txbeg + (airtime << LMIC.globalDutyRate);
+                globalDutyDelay = txbeg + (airtime << LMIC.globalDutyRate);
+        }
+        if (LMICau921_getUplinkDwellBit(LMIC.txParam)) {
+                dwellDelay = AS923_UPLINK_DWELL_TIME_osticks;
+        }
+        if (dwellDelay > globalDutyDelay) {
+                globalDutyDelay = dwellDelay;
+        }
+        if (globalDutyDelay != 0) {
+                LMIC.globalDutyAvail = txbeg + globalDutyDelay;
         }
 }