AP_HAL: RCInput has overrides

libraries/AP_HAL/RCInput.h

@@ -30,6 +30,23 @@ public:
 
     /* Read an array of channels, return the valid count */
     virtual uint8_t read(uint16_t* periods, uint8_t len) = 0;
+
+    /**
+     * Overrides: these are really grody and don't belong here but we need
+     * them at the moment to make the port work.
+     * case v of:
+     *  v == -1 -> no change to this channel
+     *  v == 0  -> do not override this channel
+     *  v > 0   -> set v as override.
+     */
+
+    /* set_overrides: array starts at ch 0, for len channels */
+    virtual bool set_overrides(int16_t *overrides, uint8_t len) = 0;
+    /* set_override: set just a specific channel */
+    virtual bool set_override(uint8_t channel, int16_t override) = 0;
+    /* clear_overrides: equivelant to setting all overrides to 0 */
+    virtual void clear_overrides() = 0;
+
 };
 
 #endif // __AP_HAL_RC_INPUT_H__