[fix] define ffd gain for quat_int stabilization

close #2391

sw/airborne/firmwares/rotorcraft/stabilization/stabilization_attitude_quat_int.c

@@ -35,11 +35,23 @@
 #include "math/pprz_algebra_int.h"
 #include "state.h"
 
+/** explicitly define to zero to disable feed-forward rate term by default */
+#ifndef STABILIZATION_ATTITUDE_PHI_FFDGAIN
+#define STABILIZATION_ATTITUDE_PHI_FFDGAIN 0
+#endif
+#ifndef STABILIZATION_ATTITUDE_THETA_FFDGAIN
+#define STABILIZATION_ATTITUDE_THETA_FFDGAIN 0
+#endif
+#ifndef STABILIZATION_ATTITUDE_PSI_FFDGAIN
+#define STABILIZATION_ATTITUDE_PSI_FFDGAIN 0
+#endif
+
 struct Int32AttitudeGains stabilization_gains = {
   {STABILIZATION_ATTITUDE_PHI_PGAIN, STABILIZATION_ATTITUDE_THETA_PGAIN, STABILIZATION_ATTITUDE_PSI_PGAIN },
   {STABILIZATION_ATTITUDE_PHI_DGAIN, STABILIZATION_ATTITUDE_THETA_DGAIN, STABILIZATION_ATTITUDE_PSI_DGAIN },
   {STABILIZATION_ATTITUDE_PHI_DDGAIN, STABILIZATION_ATTITUDE_THETA_DDGAIN, STABILIZATION_ATTITUDE_PSI_DDGAIN },
-  {STABILIZATION_ATTITUDE_PHI_IGAIN, STABILIZATION_ATTITUDE_THETA_IGAIN, STABILIZATION_ATTITUDE_PSI_IGAIN }
+  {STABILIZATION_ATTITUDE_PHI_IGAIN, STABILIZATION_ATTITUDE_THETA_IGAIN, STABILIZATION_ATTITUDE_PSI_IGAIN },
+  {STABILIZATION_ATTITUDE_PHI_FFDGAIN, STABILIZATION_ATTITUDE_THETA_FFDGAIN, STABILIZATION_ATTITUDE_PSI_FFDGAIN }
 };
 
 /* warn if some gains are still negative */