From 7f75498dfc4d696c275ac1602998ccd8b9c4159c Mon Sep 17 00:00:00 2001
From: Sandeep Mistry <sandeep.mistry@gmail.com>
Date: Sun, 25 Sep 2016 08:34:59 -0400
Subject: [PATCH] Correct formula for packet RSSI, should be based on frequency

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

diff --git a/src/LoRa.cpp b/src/LoRa.cpp
index 41e63ef..6325cb6 100644
--- a/src/LoRa.cpp
+++ b/src/LoRa.cpp
@@ -36,12 +36,15 @@
 LoRaClass::LoRaClass() :
   _spiSettings(10E6, MSBFIRST, SPI_MODE0),
   _ss(10), _reset(9),
+  _frequency(0),
   _packetIndex(0)
 {
 }
 
 int LoRaClass::begin(long frequency)
 {
+  _frequency = frequency;
+
   // setup pins
   pinMode(_ss, OUTPUT);
   pinMode(_reset, OUTPUT);
@@ -156,7 +159,7 @@ int LoRaClass::parsePacket()
 
 int LoRaClass::packetRssi()
 {
-  return (readRegister(REG_PKT_RSSI_VALUE) - 164);
+  return (readRegister(REG_PKT_RSSI_VALUE) - (_frequency < 868E6 ? 164 : 157));
 }
 
 size_t LoRaClass::write(uint8_t byte)
diff --git a/src/LoRa.h b/src/LoRa.h
index f3e8072..f161faa 100644
--- a/src/LoRa.h
+++ b/src/LoRa.h
@@ -40,6 +40,7 @@ private:
   SPISettings _spiSettings;
   int _ss;
   int _reset;
+  int _frequency;
   int _packetIndex;
 };