PX4/Firmware — pull request #1148 by LorenzMeier (2014-07-08 07:36:07+00:00)
Title: Reduce excessive FMU stack usage

With mixers loaded we still have quite some spare stack after this change (800 bytes)

```
Processes: 19 total, 2 running, 17 sleeping
CPU usage: 38.52% tasks, 0.47% sched, 61.02% idle
Uptime: 124.981s total, 80.034s idle

PID COMMAND CPU(ms) CPU(%) USED/STACK PRIO(BASE) STATE
0 Idle Task 80034 61.015 0/ 0 0 ( 0) READY
1 hpwork 4163 3.437 684/ 2040 192 (192) w:sig
2 lpwork 553 0.390 404/ 2040 50 ( 50) w:sig
3 init 334 0.000 1212/ 3496 100 (100) w:sem
56 nshterm 0 0.000 500/ 1192 100 (100) w:sem
118 top 742 3.750 1244/ 1696 100 (100) RUN
58 commander 389 0.234 2068/ 2944 215 (215) w:sig
59 commander_low_prio 38 0.000 604/ 2896 50 ( 50) w:sem
61 mavlink_if0 1382 1.093 1524/ 2696 100 (100) w:sig
62 mavlink_rcv_if0 15 0.000 788/ 2896 215 (215) w:sem
77 sensors_task 3709 2.968 908/ 1992 250 (250) w:sem
108 fmuservo 286 0.468 828/ 1592 100 (100) w:sem
81 sdlog2 473 0.156 1940/ 2992 70 ( 70) w:sig
83 gps 123 0.078 732/ 1496 220 (220) w:sem
89 ekf_att_pos_estimator 30039 24.765 3748/ 4992 215 (215) w:sem
95 fw_att_control 948 0.781 828/ 2040 250 (250) w:sem
101 fw_pos_control_l1 97 0.078 708/ 3496 250 (250) w:sem
103 dataman 23 0.000 692/ 1992 250 (250) w:sem
105 navigator 438 0.312 828/ 1992
```