Proper handling of RX1 frequency in rx_config

Previously, we weren't filling in RX1 frequecny in rx_window1_config
structure. However, everything worked as in LoRaPHY::rx_config() API
there was a check which filled in correct RX1 frequency.
Now we are filling in RX1 freq. properly while we are computing
parameters for RX1 window.

Author: Hasnain Virk

features/lorawan/lorastack/mac/LoRaMac.cpp

@@ -903,7 +903,7 @@ void LoRaMac::open_rx1_window(void)
     _lora_phy->rx_config(&_params.rx_window1_config);
     _lora_phy->handle_receive();
 
-    tr_debug("Opening RX1 Window");
+    tr_debug("RX1 slot open, Freq = %lu", _params.rx_window1_config.frequency);
 }
 
 void LoRaMac::open_rx2_window()
@@ -932,7 +932,7 @@ void LoRaMac::open_rx2_window()
     _lora_phy->handle_receive();
     _params.rx_slot = _params.rx_window2_config.rx_slot;
 
-    tr_debug("Opening RX2 Window, Frequency = %lu", _params.rx_window2_config.frequency);
+    tr_debug("RX2 slot open, Freq = %lu", _params.rx_window2_config.frequency);
 }
 
 void LoRaMac::on_ack_timeout_timer_event(void)

features/lorawan/lorastack/phy/LoRaPHY.cpp

@@ -849,6 +849,11 @@ void LoRaPHY::compute_rx_win_params(int8_t datarate, uint8_t min_rx_symbols,
                                              ((uint32_t *)phy_params.bandwidths.table)[rx_conf_params->datarate]);
     }
 
+    if (rx_conf_params->rx_slot == RX_SLOT_WIN_1) {
+        rx_conf_params->frequency = phy_params.channels.channel_list[rx_conf_params->channel].frequency;
+    }
+
+
     get_rx_window_params(t_symbol, min_rx_symbols, rx_error, RADIO_WAKEUP_TIME,
                          &rx_conf_params->window_timeout, &rx_conf_params->window_offset);
 }