teensy cmake macros

minimal dependency cmake toolchain to easily compile your teensy sketches and libraries, and optionally link with c++ std libraries.

• custom teensy toolchain using cmake and arm-none-eabi-gcc
• based on ronj/teensy-cmake-template
• targetting Teensy 4.x, tested on Teensy 4.1 (should be easy to extend for 3.x)
• compiles library code to .a archive files to avoid unnecessary recompiling

TL/DR

install build dependencies (click to expand)

• arm-none-eabi-gcc
• cmake
• teensy-cmake-macros

  > git clone https://github.com/newdigate/teensy-cmake-macros.git
  > cd teensy-cmake-macros
  > mkdir cmake-build-debug
  > cd cmake-build-debug
  > cmake ..
  > sudo make install        

clone runtime dependencies (click to expand)

• clone necessary dependencies to a chosen location ${DEPSPATH}

 > cd /home/nic/midi-smf-reader/deps
 > git clone https://github.com/PaulStoffregen/cores.git
 > git clone https://github.com/PaulStoffregen/Audio.git
 > git clone -b Juse_Use_SdFat https://github.com/PaulStoffregen/SD.git 
 > git clone https://github.com/PaulStoffregen/Wire.git
 > git clone https://github.com/PaulStoffregen/SPI.git
 > git clone https://github.com/PaulStoffregen/SerialFlash.git
 > git clone https://github.com/PaulStoffregen/arm_math.git
 > git clone https://github.com/greiman/SdFat.git

custom cmake toolchain (click to expand)

• add a custom cmake toolchain file to your project cmake/toolchains/teensy41.toolchain.cmake

set(TEENSY_VERSION 41 CACHE STRING "Set to the Teensy version corresponding to your board (40 or 41 allowed)" FORCE)
set(CPU_CORE_SPEED 600000000 CACHE STRING "Set to 600000000, 24000000, 48000000, 72000000 or 96000000 to set CPU core speed" FORCE) # Derived variables
set(COMPILERPATH "/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/") 
set(DEPSPATH "/home/nic/midi-smf-reader/deps")
set(COREPATH "${DEPSPATH}/cores/teensy4/")
find_package(teensy_cmake_macros)

• update DEPSPATH, COMPILERPATH and COREPATH to your dependencies folder, arm-none-eabi-gcc bin folder and path to teensy4 cores

add CMakeLists.txt (click to expand)

• create a CMakeLists.txt file in the root directory of your project

cmake_minimum_required(VERSION 3.5)
project(midi_smf_reader C CXX)
import_arduino_library(cores ${COREPATH})
import_arduino_library(SPI ${DEPSPATH}/SPI)
import_arduino_library(SdFat ${DEPSPATH}/SdFat/src common DigitalIO ExFatLib FatLib FsLib iostream SdCard SpiDriver)
import_arduino_library(SD ${DEPSPATH}/SD/src)

# add custom library
teensy_add_library(my_teensy_library my_teensy_library.cpp)

teensy_add_executable(my_firmware sketch.ino)
teensy_target_link_libraries(my_firmware my_teensy_library SD SdFat SPI cores) # order is IMPORTANT because we are garbage collecting symbols --gc-collect

# if you need to link to std library (using <Vector>, etc) 
set(CMAKE_EXE_LINKER_FLAGS "--specs=nano.specs" CACHE INTERNAL "")
target_link_libraries(my_firmware.elf stdc++)

build (click to expand)

• run from a terminal in your repository root directory

> mkdir cmake-build-debug
> cd cmake-build-debug
> cmake .. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE:FILEPATH="../cmake/toolchains/teensy41.toolchain.cmake" 
> make       

usage

• teensy_add_executable ( TARGET files... )

  teensy_add_executable(myapplication midiread.cpp)

• teensy_add_library ( TARGET files... )

  teensy_add_library(mylibrary library1.cpp)

• import_arduino_library ( LibraryName LibraryPath additionalRelativeSourceFolders)

  import_arduino_library(cores ${COREPATH})
  import_arduino_library(SPI ${DEPSPATH}/SPI)        # SPI@Juse_Use_SdFat
  import_arduino_library(SdFat ${DEPSPATH}/SdFat/src common DigitalIO ExFatLib FatLib FsLib iostream SdCard SpiDriver)
  import_arduino_library(SD ${DEPSPATH}/SD/src)  

• teensy_target_link_libraries ( TARGET libraries...)

  teensy_target_link_libraries(my_firmware mylibrary SD SdFat SPI cores)

• link to std library

   set(CMAKE_EXE_LINKER_FLAGS "--specs=nano.specs" CACHE INTERNAL "")
   target_link_libraries(my_firmware.elf stdc++)

• teensy_include_directories ( paths...)

  teensy_include_directories(../../src)

used in

• midi-smf-reader
• teensy-quencer