to include [BACKPORT] Merged in kekiefer/nuttx/stm32f7-serial-fix-tiocssinglewire-upstream

Because _pins[i] is set from parameter value - 1

   This is the root cause of https://github.com/PX4/Firmware/issues/9461
   The _pins array was initialized to -1. It was used to index the
   _gpios array. The value at _gpios[-1] was a number that mapped to
   Analog mode on Port A pin 0. These is the UART4_TX pin and was
   being reconfigured by the fault in the camera_trigger to an
   alaog input.

   This reverts commit a62a71f4.
   The root cause was the camera trigger passing invalid pin
   configuration setting overwriting the UART4 TX pin setting

computational load in optical flow simulation

Signed-off-by: Roman <bapstroman@gmail.com>

Fixed-wing autoland: Fix bug that could cause a steep pitch increase and thus aircraft stall during the flare (#9674)

In precland the copter may switch to horizontal approach state with an
old landing target pose message.

Fixes the SITL startup error:
ERROR [sensors] no ADC found: /dev/adc0 (9)

Introduced in 84048890

Removes SITL startup warnings:
WARN  [mavlink] stream SCALED_IMU2 not found
WARN  [mavlink] stream SCALED_IMU3 not found

Introduced in 91227250

Signed-off-by: Ivo Drescher <ivo.drescher@gmail.com>

Added more explanations regarding the coordinate transformation.

Signed-off-by: Ivo Drescher <ivo.drescher@gmail.com>

analyse_logdata_ekf:
- fix the buffer to start the analyses 5s after takeoff and end
them 5s before landing for logs that start or finish in air
- add flag for turning on-off 5s late start early end buffer
- split the combined imu sensor check into checks for vibration,
bias and output predictor

- matrix in PX4/Firmware (ed6db94ec0f1ce2b6e4a975229c51fb5e3ff559a): https://github.com/PX4/Matrix/commit/03a3e3ad46d21bb90e78f8cedd3526d24617df5f
    - matrix current upstream: https://github.com/PX4/Matrix/commit/b815fc97c4e686a93a8074f27d1830a031b0d38d
    - Changes: https://github.com/PX4/Matrix/compare/03a3e3ad46d21bb90e78f8cedd3526d24617df5f...b815fc97c4e686a93a8074f27d1830a031b0d38d

    b815fc9 2018-06-12 Roman Bapst - replace quiet_NaN() with INFINITY (#70)

  _uavcan_open_request_list was accessed before it was initalized.

    - nuttx in PX4/Firmware (ed7eb8b4b4f792b8c373692812c8e255669f482e): https://github.com/PX4-NuttX/nuttx/commit/0ac630e6d0e90480121c74d59a92676f0b951dce
    - nuttx current upstream: https://github.com/PX4-NuttX/nuttx/commit/80e58380a8d2b4da0f29eee7e0a820abf0d9f793
    - Changes: https://github.com/PX4-NuttX/nuttx/compare/0ac630e6d0e90480121c74d59a92676f0b951dce...80e58380a8d2b4da0f29eee7e0a820abf0d9f793

    80e5838 2018-06-07 David Sidrane - [REJECTED] When console is absent preserve stdio fd numbering.

 - fixes #9606

This reverts commit 27e75920.