HAL_QURT: implement cork() and push() for RCOutput

libraries/AP_HAL_QURT/RCOutput.cpp

@@ -51,7 +51,9 @@ void RCOutput::write(uint8_t ch, uint16_t period_us)
         return;
     }
     period[ch] = period_us;
-    need_write = true;
+    if (!corked) {
+        need_write = true;
+    }
 }
 
 uint16_t RCOutput::read(uint8_t ch)
@@ -108,6 +110,16 @@ void RCOutput::timer_update(void)
     ::write(fd, (uint8_t *)&frame, sizeof(frame));
 }
 
+void RCOutput::cork(void)
+{
+    corked = true;
+}
+
+void RCOutput::push(void)
+{
+    need_write = true;
+    corked = false;
+}
 
 #endif // CONFIG_HAL_BOARD_SUBTYPE
 

libraries/AP_HAL_QURT/RCOutput.h

@@ -24,6 +24,8 @@ public:
     void write(uint8_t ch, uint16_t period_us);
     uint16_t read(uint8_t ch);
     void read(uint16_t *period_us, uint8_t len);
+    void cork(void) override;
+    void push(void) override;
 
     void timer_update(void);
     
@@ -36,6 +38,7 @@ private:
     uint16_t enable_mask;
     uint16_t period[channel_count];
     volatile bool need_write;
+    bool corked;
 };
 
 #endif // CONFIG_HAL_BOARD