From 2a8e2b0c69d6a06c034e104bfe6a085a9c69ec6d Mon Sep 17 00:00:00 2001
From: FUJIURA Toyonori <toyokun@gmail.com>
Date: Mon, 28 Mar 2022 08:42:30 +0900
Subject: [PATCH] add LoRaClass::rxSignalDetected().

---
 src/LoRa.cpp | 5 +++++
 src/LoRa.h   | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/LoRa.cpp b/src/LoRa.cpp
index 210a589..128233b 100644
--- a/src/LoRa.cpp
+++ b/src/LoRa.cpp
@@ -18,6 +18,7 @@
 #define REG_FIFO_RX_CURRENT_ADDR 0x10
 #define REG_IRQ_FLAGS            0x12
 #define REG_RX_NB_BYTES          0x13
+#define REG_MODEM_STAT           0x18
 #define REG_PKT_SNR_VALUE        0x19
 #define REG_PKT_RSSI_VALUE       0x1a
 #define REG_RSSI_VALUE           0x1b
@@ -290,6 +291,10 @@ long LoRaClass::packetFrequencyError()
   return static_cast<long>(fError);
 }
 
+bool LoRaClass::rxSignalDetected() {
+  return (readRegister(REG_MODEM_STAT) & 0x01) == 0x01;
+}
+
 int LoRaClass::rssi()
 {
   return (readRegister(REG_RSSI_VALUE) - (_frequency < RF_MID_BAND_THRESHOLD ? RSSI_OFFSET_LF_PORT : RSSI_OFFSET_HF_PORT));
diff --git a/src/LoRa.h b/src/LoRa.h
index b312db5..1d93bd0 100644
--- a/src/LoRa.h
+++ b/src/LoRa.h
@@ -44,6 +44,7 @@ class LoRaClass : public Stream {
   int packetRssi();
   float packetSnr();
   long packetFrequencyError();
+  bool rxSignalDetected();
 
   int rssi();