Merge pull request #1025 from paparazzi/ardrone2_mag_fix

Chose this one over mine, if it is not working will add a fix, whatver the fix will be and then merge it again

conf/telemetry/default_ardrone.xml

@@ -19,6 +19,7 @@
       <message name="I2C_ERRORS"             period="4.1"/>
       <message name="UART_ERRORS"            period="3.1"/>
       <message name="DATALINK_REPORT"        period="5.1"/>
+      <message name="STATE_FILTER_STATUS"    period="3.2"/>
     </mode>
 
     <mode name="ppm">

conf/telemetry/default_rotorcraft.xml

@@ -21,6 +21,7 @@
       <message name="SUPERBITRF"             period="3"/>
       <message name="ENERGY"                 period="2.5"/>
       <message name="DATALINK_REPORT"        period="5.1"/>
+      <message name="STATE_FILTER_STATUS"    period="3.2"/>
     </mode>
 
     <mode name="ppm">

sw/airborne/boards/ardrone/navdata.c

@@ -58,6 +58,7 @@ static int nav_fd = 0;
 measures_t navdata;
 
 static int imu_lost = 0;
+static int imu_lost_counter = 0;
 
 /** Sonar offset.
  *  Offset value in ADC
@@ -158,7 +159,7 @@ static void send_filter_status(struct transport_tx *trans, struct link_device *d
   uint8_t mde = 3;
   if (ahrs.status == AHRS_UNINIT) mde = 2;
   if (imu_lost) mde = 5;
-  uint16_t val = 0;
+  uint16_t val = imu_lost_counter;
   pprz_msg_send_STATE_FILTER_STATUS(trans, dev, AC_ID, &mde, &val);
 }
 
@@ -317,6 +318,7 @@ static void mag_freeze_check(void) {
       printf("Mag needs resetting, Values are frozen!!! %d , %d \n", LastMagValue, navdata.mx);
       // set imu_lost flag
       imu_lost = 1;
+      imu_lost_counter++;
 
       if (mag_freeze_retry < MAG_FREEZE_MAX_RETRY) {
         printf("Setting GPIO 177 to reset PIC Navigation Board \n");
@@ -332,6 +334,7 @@ static void mag_freeze_check(void) {
 
         // do the navboard reset via GPIOs
         gpio_clear(ARDRONE_GPIO_PORT, ARDRONE_GPIO_PIN_NAVDATA);
+        usleep(20000); //Otherwise set sometime does not work
         gpio_set(ARDRONE_GPIO_PORT, ARDRONE_GPIO_PIN_NAVDATA);
 
         //// wait 20ms to retrieve data
@@ -339,8 +342,13 @@ static void mag_freeze_check(void) {
 
         //// restart acquisition
         cmd = 0x01;
+        usleep(5000);
+        for (int i=0;i<10;i++)
+        {
+          usleep(1000);
           navdata_write(&cmd, 1);
         }
+      }
 
       MagFreezeCounter = 0; // reset counter back to zero
     }
@@ -499,6 +507,7 @@ void navdata_update()
   // Check if initialized
   if (!nav_port.isInitialized) {
     navdata_init();
+    mag_freeze_check();
     return;
   }