LR2021: auto-LDRO for side detectors

examples/simple_repeater/MyMesh.cpp

@@ -1065,8 +1065,8 @@ bool MyMesh::setRxBoostedGain(bool enable) {
 }
 
 #if defined(USE_LR2021)
-bool MyMesh::configSideDetectors(const uint8_t sideDetSFs[], uint8_t num) {
-  return radio_driver.configSideDetectors(sideDetSFs, num);
+bool MyMesh::configSideDetectors(const uint8_t sideDetSFs[], uint8_t num, float bw) {
+  return radio_driver.configSideDetectors(sideDetSFs, num, bw);
 }
 #endif
 

examples/simple_repeater/MyMesh.h

@@ -256,7 +256,7 @@ public:
   bool setRxBoostedGain(bool enable) override;
 
   #if defined(USE_LR2021)
-  virtual bool configSideDetectors(const uint8_t sideDetSFs[], uint8_t num) override;
+  virtual bool configSideDetectors(const uint8_t sideDetSFs[], uint8_t num, float bw) override;
   #endif
 
 };

src/helpers/CommonCLI.cpp

@@ -766,7 +766,7 @@ void CommonCLI::handleSetCmd(uint32_t sender_timestamp, char* command, char* rep
         sideDetSFs[i] = atoi(parts[i]);
       }
       sideDetSFs[num] = 0;
-      if (_callbacks->configSideDetectors(sideDetSFs, num)) {
+      if (_callbacks->configSideDetectors(sideDetSFs, num, _prefs->bw)) {
         for (int i = 0; i <= num; i++) _prefs->extra_sf[i] = sideDetSFs[i];
         savePrefs();
         sprintf(reply, "OK - extra SFs set");

src/helpers/CommonCLI.h

@@ -241,7 +241,7 @@ public:
   };
 
   #if defined(USE_LR2021)
-  virtual bool configSideDetectors(const uint8_t sideDetSFs[], uint8_t num) {
+  virtual bool configSideDetectors(const uint8_t sideDetSFs[], uint8_t num, float bw) {
     return false; // Override in wrapper
   } 
   #endif

src/helpers/radiolib/CustomLR2021Wrapper.h

@@ -24,7 +24,7 @@ public:
     applySideDetectorConfig();
   }
 
-  bool configSideDetectors(const uint8_t* sideDetSFs, uint8_t num) override {
+  bool configSideDetectors(const uint8_t* sideDetSFs, uint8_t num, float bw) override {
     LR2021LoRaSideDetector_t tmp[3];
     uint8_t sf = getSpreadingFactor();
 
@@ -35,7 +35,8 @@ public:
       if (sideDetSFs[i] > sf + 4) { return false; }  // span must not be > 4
 
       tmp[i].sf = sideDetSFs[i];
-      if (sideDetSFs[i] == 10) { // TODO: set ldro=true when tSym >=16
+      float tSym = calcTsym(tmp[i].sf, bw);
+      if (tSym >= 16.0f) {
         tmp[i].ldro = true;
       } else {
         tmp[i].ldro = false; 
@@ -63,6 +64,11 @@ public:
     return status;
   }
 
+  float calcTsym(uint8_t sf, float bw) {
+    float tSym = (float)(uint32_t(1) << sf) / (float)bw;
+    return tSym;
+  }
+
   bool isReceivingPacket() override {
     return ((CustomLR2021 *)_radio)->isReceiving();
   }
@@ -98,5 +104,4 @@ public:
     LR2021LoRaSideDetector_t _sideDet[3];
     size_t _numSideDet = 0;
 
-
 };

src/helpers/radiolib/RadioLibWrappers.h

@@ -78,7 +78,7 @@ public:
   virtual bool setRxBoostedGainMode(bool) { return false; }
   virtual bool getRxBoostedGainMode() const { return false; }
   
-  virtual bool configSideDetectors(const uint8_t sideDetSFs[], uint8_t num) { return false; }
+  virtual bool configSideDetectors(const uint8_t sideDetSFs[], uint8_t num, float bw) { return false; }
 };
 
 /**