[Sponsored by Holybro] Support for Kakute H743-Wing (#24669)

* hrt: Fix PPM input on channel 2

The CCMR1_PPM define for PPM input on channel 2 was incorrectly set to 2,
which was setting bits for channel 1 instead of channel 2. This prevented
PPM input from functioning properly on channel 2.

Changed CCMR1_PPM for channel 2 from 2 to (1 << 8), which correctly
configures the CC2S bits for input capture mode on TI2.

This fixes an issue noted in the existing code comment:
"FIXME! There is an interaction in the CCMR registers that prevents
using Chan 1 as the timer and chan 2 as the PPM"

Tested on STM32H743 with PPM input on PC7 (TIM8_CH2).

* rc_input: enable sharing serial and PPM pin

By setting RC_SERIAL_PORT_SHARED_PPM_PIN_GPIO_RX it is now possible to
use the same pin on the STM32 for PPM input as well as serial input.

* boards: Add support for Holybro KakuteH7-Wing

docs/en/SUMMARY.md

@@ -181,6 +181,7 @@
       - [Holybro Kakute H7v2](flight_controller/kakuteh7v2.md)
       - [Holybro Kakute H7mini](flight_controller/kakuteh7mini.md)
       - [Holybro Kakute H7](flight_controller/kakuteh7.md)
+      - [Holybro Kakute H7 Wing](flight_controller/kakuteh7-wing.md)
       - [Holybro Durandal](flight_controller/durandal.md)
         - [Wiring Quickstart](assembly/quick_start_durandal.md)
       - [Holybro Pix32 v5](flight_controller/holybro_pix32_v5.md)

docs/en/_sidebar.md

@@ -182,6 +182,7 @@
       - [Holybro Kakute H7v2](/flight_controller/kakuteh7v2.md)
       - [Holybro Kakute H7mini](/flight_controller/kakuteh7mini.md)
       - [Holybro Kakute H7](/flight_controller/kakuteh7.md)
+      - [Holybro Kakute H7 Wing](flight_controller/kakuteh7-wing.md)
       - [Holybro Durandal](/flight_controller/durandal.md)
         - [Wiring Quickstart](/assembly/quick_start_durandal.md)
       - [Holybro Pix32 v5](/flight_controller/holybro_pix32_v5.md)

docs/en/flight_controller/kakuteh7-wing.md

@@ -0,0 +1,86 @@
+# Holybro Kakute H7 V2
+
+:::warning
+PX4 does not manufacture this (or any) autopilot.
+Contact the [manufacturer](https://holybro.com/) for hardware support or compliance issues.
+:::
+
+The [Holybro Kakute H743 Wing](https://holybro.com/products/kakute-h743-wing) is a fully featured flight controller specifically aimed at fixed-wing and VTOL applications. It has the STM32 H743 Processor running at 480 MHz and CAN Bus support, along with dual camera support & switch, ON/OFF Pit Switch, 5V, 6V/8V, 9V/12 BEC, and plug-and-play GPS, CAN, I2C ports.
+
+
+::: info
+This flight controller is [manufacturer supported](../flight_controller/autopilot_manufacturer_supported.md).
+:::
+
+## Where to Buy
+
+The board can be bought from one of the following shops (for example):
+
+- [Holybro](https://holybro.com/products/kakute-h743-wing)
+
+
+## Connectors and Pins
+
+| Pin              | Function                          | PX4 default                |
+| ---------------- | --------------------------------- | -------------------------- |
+| GPS 1            | USART1 and I2C1                   | GPS1                       |
+| R2, T2           | USART2 RX and TX                  | GPS2                       |
+| R3, T3           | USART3 RX and TX                  | TELEM1                     |
+| R5, T5           | USART5 RX and TX                  | TELEM2                     |
+| R6, T6           | USART6 RX and TX                  | RC (PPM, SBUS, etc.) input |
+| R7, T7, RTS, CTS | UART7 RX and TX with flow control | TELEM3                     |
+| R8, T8           | UART8 RX and TX                   | Console                    |
+| Buz-, Buz+       | Piezo buzzer                      |                            |
+| M1 to M14        | Motor signal outputs              |                            |
+
+<a id="bootloader"></a>
+
+## PX4 Bootloader Update
+
+The board comes pre-installed with [Betaflight](https://github.com/betaflight/betaflight/wiki).
+Before the PX4 firmware can be installed, the _PX4 bootloader_ must be flashed.
+Download the [holybro_kakuteh7-wing.hex](https://github.com/PX4/PX4-Autopilot/raw/main/docs/assets/flight_controller/kakuteh7-wing/holybro_kakuteh7-wing_bootloader.hex) bootloader binary and read [this page](../advanced_config/bootloader_update_from_betaflight.md) for flashing instructions.
+
+## Building Firmware
+
+To [build PX4](../dev_setup/building_px4.md) for this target:
+
+```
+make holybro_kakuteh7-wing_default
+```
+
+## Installing PX4 Firmware
+
+::: info
+KakuteH7-wing is supported with PX4 master & PX4 v1.16 or newer..
+Prior to that release you will need to manually build and install the firmware.
+:::
+
+Firmware can be manually installed in any of the normal ways:
+
+- Build and upload the source:
+
+  ```
+  make holybro_kakuteh7-wing_default upload
+  ```
+
+- [Load the firmware](../config/firmware.md) using _QGroundControl_.
+  You can use either pre-built firmware or your own custom firmware.
+
+## Serial Port Mapping
+
+| UART   | Device     | Port                  | Default function |
+| ------ | ---------- | --------------------- | ---------------- |
+| USART1 | /dev/ttyS0 | GPS 1                 | GPS1             |
+| USART2 | /dev/ttyS1 | R2, T2                | GPS2             |
+| USART3 | /dev/ttyS2 | R3, T3                | TELEM1           |
+| UART5  | /dev/ttyS3 | R5, T5                | TELEM2           |
+| USART6 | /dev/ttyS4 | R6, (T6)              | RC input         |
+| UART7  | /dev/ttyS5 | R7, T7, RTS, CTS      | TELEM3           |
+| UART8  | /dev/ttyS6 | R8, T8                | Console          |
+
+## Debug Port
+
+### System Console
+
+UART8 RX and TX are configured for use as the [System Console](../debug/system_console.md).