[modules] digital_cam: add DC_POWER_OFF_LED

closes #478

sw/airborne/modules/digital_cam/led_cam_ctrl.c

@@ -52,6 +52,12 @@ void dc_send_command(uint8_t cmd)
     case DC_ON:
       DC_PUSH(DC_POWER_LED);
       break;
+#endif
+#ifdef DC_POWER_OFF_LED
+    case DC_OFF:
+      DC_PUSH(DC_POWER_OFF_LED);
+      dc_timer = DC_POWER_OFF_DELAY;
+      break;
 #endif
     default:
       break;

sw/airborne/modules/digital_cam/led_cam_ctrl.h

@@ -35,6 +35,7 @@
  *   <define name="DC_ZOOM_IN_LED" value="7"/>
  *   <define name="DC_ZOOM_OUT_LED" value="8"/>
  *   <define name="DC_POWER_LED" value="9"/>
+ *   <define name="DC_POWER_OFF_LED" value="10"/>
  * @endverbatim
  *  Related bank and pin must also be defined:
  * @verbatim
@@ -68,6 +69,10 @@ extern uint8_t dc_timer;
 #define DC_SHUTTER_DELAY 2  /* 4Hz -> 0.5s */
 #endif
 
+#ifndef DC_POWER_OFF_DELAY
+#define DC_POWER_OFF_DELAY 3
+#endif
+
 #ifndef DC_SHUTTER_LED
 #error DC: Please specify at least a SHUTTER LED
 #endif
@@ -90,6 +95,9 @@ static inline void led_cam_ctrl_init(void)
 #ifdef DC_POWER_LED
     DC_RELEASE(DC_POWER_LED);
 #endif
+#ifdef DC_POWER_OFF_LED
+    DC_RELEASE(DC_POWER_OFF_LED);
+#endif
 }
 
 
@@ -114,6 +122,9 @@ static inline void led_cam_ctrl_periodic( void )
 #endif
 #ifdef DC_POWER_LED
     DC_RELEASE(DC_POWER_LED);
+#endif
+#ifdef DC_POWER_OFF_LED
+    DC_RELEASE(DC_POWER_OFF_LED);
 #endif
   }