dshot: move implementation to a separate directory & library

So that the static memory overhead is not added to targets w/o dshot

platforms/nuttx/src/px4/stm/stm32_common/dshot/CMakeLists.txt

@@ -0,0 +1,36 @@
+############################################################################
+#
+#   Copyright (c) 2015-2019 PX4 Development Team. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name PX4 nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+px4_add_library(arch_dshot
+	dshot.c
+)

platforms/nuttx/src/px4/stm/stm32_common/io_pins/CMakeLists.txt

@@ -36,5 +36,4 @@ px4_add_library(arch_io_pins
 	pwm_servo.c
 	pwm_trigger.c
 	input_capture.c
-	dshot.c
 )

platforms/nuttx/src/px4/stm/stm32f4/CMakeLists.txt

@@ -33,6 +33,7 @@
 
 
 add_subdirectory(../stm32_common/adc adc)
+add_subdirectory(../stm32_common/dshot dshot)
 add_subdirectory(../stm32_common/hrt hrt)
 add_subdirectory(../stm32_common/led_pwm led_pwm)
 add_subdirectory(../stm32_common/io_pins io_pins)

platforms/nuttx/src/px4/stm/stm32f7/CMakeLists.txt

@@ -33,6 +33,7 @@
 
 
 add_subdirectory(../stm32_common/adc adc)
+add_subdirectory(../stm32_common/dshot dshot)
 add_subdirectory(../stm32_common/hrt hrt)
 add_subdirectory(../stm32_common/led_pwm led_pwm)
 add_subdirectory(../stm32_common/io_pins io_pins)

src/drivers/dshot/CMakeLists.txt

@@ -38,6 +38,7 @@ px4_add_module(
 		dshot.cpp
 	DEPENDS
 		arch_io_pins
+		arch_dshot
 		mixer
 		mixer_module
 		output_limit