As opposed to standard applications, Arduino "executables" can't just run on the host OS, and must be uploaded to a connected board.

To upload your program to the board, you should do several things:

1. Specify a port to upload to - That's where your board is connected to the system. The following examples show how to do it on Linux and Windows.

   Linux:

   generate_arduino_firmware(${CMAKE_PROJECT_NAME}
           SRCS main.cpp
           BOARD uno
           PORT /dev/ttyACM0)

   Windows:

   generate_arduino_firmware(${CMAKE_PROJECT_NAME}
           SRCS main.cpp
           BOARD uno
           PORT COM3)

2. Build the ${CMAKE_PROJECT_NAME}-upload target created by executing cmake. CMake creates several targets that could be built, with the Build-All target as the default target. Building this target is sufficient for uploading, however, sometimes it's better to do this explicitly.

   Building the upload target on a valid port will result in the firmware being uploaded to the connected board, and will immediately run, just as it does with Arduino IDE.

Users of Arduino-CMake can define several different firmware images for uploading in a single project, each defined to a different port connected to the PC. To upload them all at once, you should build the upload target, or simply the default Build-Alltarget as it builds all targets for all defined images.

Each OS has its' own set of serial terminals, named differently. Below is the list of known serial terminals on each supported OS:

On Linux the serial device/port is named as follows:

• /dev/ttyUSBX
• /dev/ttyACMX

Where X is the device number.

/dev/ttyACMX is used for new Uno and Mega Arduinos, while /dev/ttyUSBX for the old ones.

Similar to Linux, there are 2 names for device/ports in Mac:

• /dev/tty.usbmodemXXX
• /dev/tty.usbserialXXX

Where XXX is the device ID.

tty.usbmodemXXX is used for new Uno and Mega Arduinos, while tty.usbserialXXX for the old ones.

Windows names all of its serial devices/ports as COMx, where x is the device number.