Add blackbox support for RSSI logging

src/main/blackbox/blackbox.c

@@ -200,6 +200,7 @@ static const blackboxMainFieldDefinition_t blackboxMainFields[] = {
 #ifdef SONAR
     {"sonarRaw",   -1, SIGNED,   .Ipredict = PREDICT(0),       .Iencode = ENCODING(SIGNED_VB),   .Ppredict = PREDICT(PREVIOUS),      .Pencode = ENCODING(TAG8_8SVB), FLIGHT_LOG_FIELD_CONDITION_SONAR},
 #endif
+    {"rssi",       -1, UNSIGNED, .Ipredict = PREDICT(0),       .Iencode = ENCODING(UNSIGNED_VB), .Ppredict = PREDICT(PREVIOUS),      .Pencode = ENCODING(TAG8_8SVB), FLIGHT_LOG_FIELD_CONDITION_RSSI},
 
     /* Gyros and accelerometers base their P-predictions on the average of the previous 2 frames to reduce noise impact */
     {"gyroADC",   0, SIGNED,   .Ipredict = PREDICT(0),       .Iencode = ENCODING(SIGNED_VB),   .Ppredict = PREDICT(AVERAGE_2),     .Pencode = ENCODING(SIGNED_VB), CONDITION(ALWAYS)},
@@ -265,6 +266,9 @@ extern uint8_t motorCount;
 //From mw.c:
 extern uint32_t currentTime;
 
+//From rx.c:
+extern uint16_t rssi;
+
 static BlackboxState blackboxState = BLACKBOX_STATE_DISABLED;
 
 static uint32_t blackboxLastArmingBeep = 0;
@@ -360,6 +364,9 @@ static bool testBlackboxConditionUncached(FlightLogFieldCondition condition)
             return false;
 #endif
 
+        case FLIGHT_LOG_FIELD_CONDITION_RSSI:
+            return masterConfig.rxConfig.rssi_channel > 0 || feature(FEATURE_RSSI_ADC);
+
         case FLIGHT_LOG_FIELD_CONDITION_NOT_LOGGING_EVERY_FRAME:
             return masterConfig.blackbox_rate_num < masterConfig.blackbox_rate_denom;
 
@@ -485,6 +492,10 @@ static void writeIntraframe(void)
         }
 #endif
 
+    if (testBlackboxCondition(FLIGHT_LOG_FIELD_CONDITION_RSSI)) {
+        blackboxWriteUnsignedVB(blackboxCurrent->rssi);
+    }
+
     for (x = 0; x < XYZ_AXIS_COUNT; x++) {
         blackboxWriteSignedVB(blackboxCurrent->gyroADC[x]);
     }
@@ -518,7 +529,7 @@ static void writeIntraframe(void)
 static void writeInterframe(void)
 {
     int x;
-    int32_t deltas[7];
+    int32_t deltas[8];
 
     blackboxValues_t *blackboxCurrent = blackboxHistory[0];
     blackboxValues_t *blackboxLast = blackboxHistory[1];
@@ -598,6 +609,10 @@ static void writeInterframe(void)
     }
 #endif
 
+    if (testBlackboxCondition(FLIGHT_LOG_FIELD_CONDITION_RSSI)) {
+        deltas[optionalFieldCount++] = (int32_t) blackboxCurrent->rssi - blackboxLast->rssi;
+    }
+
     blackboxWriteTag8_8SVB(deltas, optionalFieldCount);
 
     //Since gyros, accs and motors are noisy, base the prediction on the average of the history:
@@ -810,6 +825,8 @@ static void loadBlackboxState(void)
     blackboxCurrent->sonarRaw = sonarRead();
 #endif
 
+    blackboxCurrent->rssi = rssi;
+
 #ifdef USE_SERVOS
     //Tail servo for tricopters
     blackboxCurrent->servo[5] = servo[5];

src/main/blackbox/blackbox.h

@@ -46,6 +46,7 @@ typedef struct blackboxValues_t {
 #ifdef SONAR
     int32_t sonarRaw;
 #endif
+    uint16_t rssi;
 } blackboxValues_t;
 
 void blackboxLogEvent(FlightLogEvent event, flightLogEventData_t *data);

src/main/blackbox/blackbox_fielddefs.h

@@ -34,6 +34,7 @@ typedef enum FlightLogFieldCondition {
     FLIGHT_LOG_FIELD_CONDITION_VBAT,
     FLIGHT_LOG_FIELD_CONDITION_AMPERAGE_ADC,
     FLIGHT_LOG_FIELD_CONDITION_SONAR,
+    FLIGHT_LOG_FIELD_CONDITION_RSSI,
 
     FLIGHT_LOG_FIELD_CONDITION_NONZERO_PID_D_0,
     FLIGHT_LOG_FIELD_CONDITION_NONZERO_PID_D_1,