fft: Add cmsis submodule for fft computation

Signed-off-by: Raphael Gault <[email protected]>

Merged CMakeLists.txt target link libraries with master - includes relevant CMSIS libraries.

Author: raphaelgault

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "CMSIS_5"]
+	path = CMSIS_5
+	url = [email protected]:ARM-software/CMSIS_5.git

CMSIS_5

@@ -50,9 +50,29 @@ RECURSIVE_FIND_FILE(LIB_ARCHIVE_FILES "${CMAKE_CURRENT_LIST_DIR}/lib" "*.a")
 
 set(CMAKE_SYSTEM_PROCESSOR "armv7-m" PARENT_SCOPE)
 
+set(ROOT "${CMAKE_CURRENT_LIST_DIR}/CMSIS_5/")
+list(APPEND INCLUDE_DIRS "${ROOT}/CMSIS/Core/Include/")
+
+
+# Define the path to CMSIS-DSP (ROOT is defined on command line when using cmake)
+set(DSP ${ROOT}/CMSIS/DSP)
+
+include(${DSP}/Toolchain/GCC.cmake)
+
+# Add DSP folder to module path
+list(APPEND CMAKE_MODULE_PATH ${DSP})
+
+########### 
+#
+# CMSIS DSP
+#
+
 # add them
 include_directories(${INCLUDE_DIRS})
 
+# Load CMSIS-DSP definitions. Libraries will be built in bin_dsp
+add_subdirectory(${DSP}/Source bin_dsp)
+
 # create our target
 add_library(codal-microbit-v2 ${SOURCE_FILES})
 
@@ -61,6 +81,11 @@ target_link_libraries(
     codal-nrf52
     codal-core
     codal-microbit-nrf5sdk
+    CMSISDSPSupport
+    CMSISDSPTransform
+    CMSISDSPCommon
+    CMSISDSPComplexMath
+    CMSISDSPStatistics
     ${LIB_OBJECT_FILES}
     ${LIB_ARCHIVE_FILES}
 )

CMakeLists.txt

@@ -50,11 +50,11 @@
     "cmake_definitions":{
         "MBED_LEGACY_TOOLCHAIN":"GCC_ARM;"
     },
-    "cpu_opts":"-mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp",
+    "cpu_opts":"-mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard",
     "asm_flags":"-fno-exceptions -fno-unwind-tables --specs=nosys.specs -mcpu=cortex-m4 -mthumb",
     "c_flags":"-std=c99 --specs=nosys.specs -Warray-bounds",
     "cpp_flags":"-std=c++11 -fwrapv -fno-rtti -fno-threadsafe-statics -fno-exceptions -fno-unwind-tables -Wl,--gc-sections -Wl,--sort-common -Wl,--sort-section=alignment -Wno-array-bounds",
-    "linker_flags":"-Wl,--no-wchar-size-warning -Wl,--gc-sections -Wl,--wrap,atexit -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -Wl,--start-group -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys -Wl,--end-group",
+    "linker_flags":"-Wl,--no-wchar-size-warning -Wl,--gc-sections -Wl,--wrap,atexit -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard -Wl,--start-group -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys -Wl,--end-group",
     "libraries":[
         {
             "name":"codal-core",