Fix issues impacting RX_STATE_MODES state duration and add DEBUG_RX_STATE_TIME

src/main/build/debug.c

@@ -99,4 +99,5 @@ const char * const debugModeNames[DEBUG_COUNT] = {
     "TIMING_ACCURACY",
     "RX_EXPRESSLRS_SPI",
     "RX_EXPRESSLRS_PHASELOCK",
+    "RX_STATE_TIME"
 };

src/main/build/debug.h

@@ -97,6 +97,7 @@ typedef enum {
     DEBUG_TIMING_ACCURACY,
     DEBUG_RX_EXPRESSLRS_SPI,
     DEBUG_RX_EXPRESSLRS_PHASELOCK,
+    DEBUG_RX_STATE_TIME,
     DEBUG_COUNT
 } debugType_e;
 

src/main/fc/rc_adjustments.c

@@ -659,6 +659,9 @@ static uint8_t applySelectAdjustment(adjustmentFunction_e adjustmentFunction, ui
 
 static void calcActiveAdjustmentRanges(void)
 {
+    // This initialisation upsets the scheduler task duration estimation
+    schedulerIgnoreTaskExecTime();
+
     adjustmentRange_t defaultAdjustmentRange;
     memset(&defaultAdjustmentRange, 0, sizeof(defaultAdjustmentRange));
 

src/main/fc/tasks.c

@@ -182,9 +182,10 @@ bool taskUpdateRxMainInProgress()
 
 static void taskUpdateRxMain(timeUs_t currentTimeUs)
 {
-    static timeUs_t rxStateDurationFracUs[RX_STATE_COUNT];
-    timeUs_t executeTimeUs;
+    static timeDelta_t rxStateDurationFracUs[RX_STATE_COUNT];
+    timeDelta_t executeTimeUs;
     rxState_e oldRxState = rxState;
+    timeDelta_t anticipatedExecutionTime;
 
     // Where we are using a state machine call schedulerIgnoreTaskExecRate() for all states bar one
     if (rxState != RX_STATE_UPDATE) {
@@ -230,6 +231,12 @@ static void taskUpdateRxMain(timeUs_t currentTimeUs)
 
     executeTimeUs = micros() - currentTimeUs + RX_TASK_MARGIN;
 
+    // If the scheduler has reduced the anticipatedExecutionTime due to task aging, pick that up
+    anticipatedExecutionTime = schedulerGetNextStateTime();
+    if (anticipatedExecutionTime != (rxStateDurationFracUs[oldRxState] >> RX_TASK_DECAY_SHIFT)) {
+        rxStateDurationFracUs[oldRxState] = anticipatedExecutionTime << RX_TASK_DECAY_SHIFT;
+    }
+
     if (executeTimeUs > (rxStateDurationFracUs[oldRxState] >> RX_TASK_DECAY_SHIFT)) {
         rxStateDurationFracUs[oldRxState] = executeTimeUs << RX_TASK_DECAY_SHIFT;
     } else {
@@ -237,6 +244,10 @@ static void taskUpdateRxMain(timeUs_t currentTimeUs)
         rxStateDurationFracUs[oldRxState]--;
     }
 
+    if (debugMode == DEBUG_RX_STATE_TIME) {
+        debug[oldRxState] = rxStateDurationFracUs[oldRxState] >> RX_TASK_DECAY_SHIFT;
+    }
+
     schedulerSetNextStateTime(rxStateDurationFracUs[rxState] >> RX_TASK_DECAY_SHIFT);
 }
 

src/main/osd/osd.c

@@ -299,6 +299,13 @@ void changeOsdProfileIndex(uint8_t profileIndex)
 
 void osdAnalyzeActiveElements(void)
 {
+    /* This code results in a total RX task RX_STATE_MODES state time of ~68us on an F411 overclocked to 108MHz
+     * This upsets the scheduler task duration estimation and will break SPI RX communication. This can
+     * occur in flight, but only when the OSD profile is changed by switch so can be ignored, only causing
+     * one late task instance.
+     */
+    schedulerIgnoreTaskExecTime();
+
     osdAddActiveElements();
     osdDrawActiveElementsBackground(osdDisplayPort);
 }

src/main/scheduler/scheduler.c

@@ -356,6 +356,11 @@ FAST_CODE void schedulerSetNextStateTime(timeDelta_t nextStateTime)
     taskNextStateTime = nextStateTime;
 }
 
+FAST_CODE timeDelta_t schedulerGetNextStateTime()
+{
+    return currentTask->anticipatedExecutionTime >> TASK_EXEC_TIME_SHIFT;
+}
+
 FAST_CODE timeUs_t schedulerExecuteTask(task_t *selectedTask, timeUs_t currentTimeUs)
 {
     timeUs_t taskExecutionTimeUs = 0;

src/main/scheduler/scheduler.h

@@ -230,6 +230,7 @@ void schedulerResetTaskStatistics(taskId_e taskId);
 void schedulerResetTaskMaxExecutionTime(taskId_e taskId);
 void schedulerResetCheckFunctionMaxExecutionTime(void);
 void schedulerSetNextStateTime(timeDelta_t nextStateTime);
+timeDelta_t schedulerGetNextStateTime();
 void schedulerInit(void);
 void scheduler(void);
 timeUs_t schedulerExecuteTask(task_t *selectedTask, timeUs_t currentTimeUs);