Allow for quicker updates of OSD element data

docs/Settings.md

@@ -4772,6 +4772,16 @@ Value above which to make the OSD distance from home indicator blink (meters)
 
 ---
 
+### osd_elements_updated_per_cycle
+
+Number of OSD elements to update per OSD cycle. Increase this value to reduce the time it takes to update all OSD elements, at the cost of higher CPU usage. Decrease this value to reduce CPU usage, at the cost of slower OSD element updates.
+
+| Default | Min | Max |
+| --- | --- | --- |
+| 5 | 1 | 10 |
+
+---
+
 ### osd_esc_rpm_precision
 
 Number of characters used to display the RPM value.

src/main/fc/settings.yaml

@@ -3329,6 +3329,12 @@ groups:
         max: 600
         type: int16_t
         field: msp_displayport_fullframe_interval
+      - name: osd_elements_updated_per_cycle
+        description: "Number of OSD elements to update per OSD cycle. Increase this value to reduce the time it takes to update all OSD elements, at the cost of higher CPU usage. Decrease this value to reduce CPU usage, at the cost of slower OSD element updates."
+        default_value: 5
+        field: elements_updated_per_cycle
+        min: 1
+        max: 10
       - name: osd_units
         description: "IMPERIAL, METRIC, UK"
         default_value: "METRIC"

src/main/io/osd.c

@@ -4242,18 +4242,28 @@ uint8_t osdIncElementIndex(uint8_t elementIndex)
     return elementIndex;
 }
 
-void osdDrawNextElement(void)
+void osdDrawNextElements(void)
 {
     static uint8_t elementIndex = 0;
-    // Flag for end of loop, also prevents infinite loop when no elements are enabled
-    uint8_t index = elementIndex;
-    do {
-        elementIndex = osdIncElementIndex(elementIndex);
-    } while (!osdDrawSingleElement(elementIndex) && index != elementIndex);
+
+    for (uint8_t i = 1; i <= osdConfig()->elements_updated_per_cycle; i++) {
+        // Flag for end of loop, also prevents infinite loop when no elements are enabled
+        uint8_t index = elementIndex;
+        do {
+            elementIndex = osdIncElementIndex(elementIndex);
+        } while (!osdDrawSingleElement(elementIndex) && index != elementIndex);
+
+        if (index == elementIndex || elementIndex == 0) {
+            break;
+        }
+    }
 
     // Draw artificial horizon + tracking telemetry last
-    osdDrawSingleElement(OSD_ARTIFICIAL_HORIZON);
-    if (osdConfig()->telemetry>0){
+    if (osdElementEnabled(OSD_ARTIFICIAL_HORIZON, true)) {
+        osdDrawSingleElement(OSD_ARTIFICIAL_HORIZON);
+    }
+
+    if (osdConfig()->telemetry > 0){
         osdDisplayTelemetry();
     }
 }
@@ -4304,6 +4314,7 @@ PG_RESET_TEMPLATE(osdConfig_t, osdConfig,
     .video_system = SETTING_OSD_VIDEO_SYSTEM_DEFAULT,
     .row_shiftdown = SETTING_OSD_ROW_SHIFTDOWN_DEFAULT,
     .msp_displayport_fullframe_interval = SETTING_OSD_MSP_DISPLAYPORT_FULLFRAME_INTERVAL_DEFAULT,
+    .elements_updated_per_cycle = SETTING_OSD_ELEMENTS_UPDATED_PER_CYCLE_DEFAULT,
 
     .ahi_reverse_roll = SETTING_OSD_AHI_REVERSE_ROLL_DEFAULT,
     .ahi_max_pitch = SETTING_OSD_AHI_MAX_PITCH_DEFAULT,
@@ -5976,7 +5987,7 @@ static void osdRefresh(timeUs_t currentTimeUs)
             displayClearScreen(osdDisplayPort);
             fullRedraw = false;
         }
-        osdDrawNextElement();
+        osdDrawNextElements();
         displayHeartbeat(osdDisplayPort);
         displayCommitTransaction(osdDisplayPort);
 #ifdef OSD_CALLS_CMS

src/main/io/osd.h

@@ -451,6 +451,7 @@ typedef struct osdConfig_s {
     videoSystem_e   video_system;
     uint8_t         row_shiftdown;
     int16_t         msp_displayport_fullframe_interval;
+    uint8_t         elements_updated_per_cycle;
 
     // Preferences
     uint8_t         main_voltage_decimals;