Tutorial for MPPT 2420 LC software build

derhaegr · October 21, 2020, 7:26pm

Hi,

Anyone has a tutorial or can tell me how to build the hex or bin for this?
I can write Python and program devices but building a hex is something else.

martinjaeger · October 23, 2020, 2:44pm

Did you find the firmware repository? It describes which tools you need.

In addition to that, here is some additional information about flashing.

derhaegr · October 23, 2020, 3:04pm

Hi Martin,

I see you updated it last month, i tried it before but for a noob it is not that easy to build this.
I allready have visual studio and added platform io, so i need a bit more info on step 2 and 3 now.

Flashing is not a issue, loads of experience there.

martinjaeger · October 23, 2020, 3:14pm

The default settings should be fine. So all you need to do is to select the correct board in PlatformIO, I guess.

derhaegr · October 23, 2020, 3:48pm

OK quick update, i was able to install “Visual Studio Code”, not sure i need that.
Open platform io and add workspace and i pressed build.
It was building but failed… still need to check.

derhaegr · October 23, 2020, 4:39pm

Processing mppt_2420_lc (board: mppt_2420_lc; platform: ststm32@~8.0.0; framework: zephyr)

Verbose mode can be enabled via -v, --verbose option
CONFIGURATION: https://docs.platformio.org/page/boards/ststm32/mppt_2420_lc.html
PLATFORM: ST STM32 (8.0.0) > Libre Solar MPPT 2420 LC
HARDWARE: STM32F072RBT6 48MHz, 16KB RAM, 128KB Flash
DEBUG: Current (stlink) On-board (stlink) External (blackmagic, jlink)
PACKAGES:

framework-zephyr 2.20300.200823 (2.3.0)
framework-zephyr-canopennode 0.0.0-alpha+sha.5c6b0566d5
framework-zephyr-civetweb 0.0.0-alpha+sha.99129c5efc
framework-zephyr-cmsis 0.0.0-alpha+sha.542b2296e6
framework-zephyr-fatfs 0.0.0-alpha+sha.9ee6b9b951
framework-zephyr-hal-st 0.0.0-alpha+sha.5b3ec3e182
framework-zephyr-hal-stm32 0.0.0-alpha+sha.d1bc80d021
framework-zephyr-libmetal 0.0.0-alpha+sha.3c3c9ec83b
framework-zephyr-littlefs 0.0.0-alpha+sha.0aefdda69d
framework-zephyr-loramac-node 0.0.0-alpha+sha.29e516ec58
framework-zephyr-lvgl 0.0.0-alpha+sha.74fc2e753a
framework-zephyr-mbedtls 0.0.0-alpha+sha.4bf099f125
framework-zephyr-mcuboot 0.0.0-alpha+sha.e88113bbeb
framework-zephyr-mcumgr 0.0.0-alpha+sha.5885efb7ca
framework-zephyr-mipi-sys-t 0.0.0-alpha+sha.957d46bc3c
framework-zephyr-open-amp 0.0.0-alpha+sha.724f7e2a45
framework-zephyr-openthread 0.0.0-alpha+sha.a83d18cf18
framework-zephyr-segger 0.0.0-alpha+sha.6fcf61606d
framework-zephyr-tinycbor 0.0.0-alpha+sha.40daca97b4
framework-zephyr-tinycrypt 0.0.0-alpha+sha.3e9a49d267
framework-zephyr-trusted-firmware-m 0.0.0-alpha+sha.7de2daa196
tool-cmake 3.16.4
tool-dtc 1.4.7
tool-ninja 1.9.0
toolchain-gccarmnoneeabi 1.80201.190214 (8.2.1)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 2 compatible libraries
Scanning dependencies…
Dependency Graph
|-- 0.2.0
|-- 0.1.0
Building in release mode
Linking .pio\build\mppt_2420_lc\firmware-pre.elf
Memory region Used Size Region Size %age Used
FLASH: 80952 B 128 KB 61.76%
c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/…/lib/gcc/arm-none-eabi/8.2.1/…/…/…/…/arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX\CMakeCXXCompilerId.o: in function main': SRAM: 16064 B 16 KB 98.05% C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX/CMakeCXXCompilerId.cpp:640: multiple definition of main’; .pio\build\mppt_2420_lc\src\main.o:C:\Users\user\source\repos\charge-controller-firmware/src/main.cpp:31: first defined here
IDT_LIST: 152 B 2 KB 7.42%
c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/…/lib/gcc/arm-none-eabi/8.2.1/…/…/…/…/arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC\CMakeCCompilerId.o: in function main': C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC/CMakeCCompilerId.c:649: multiple definition of main’; .pio\build\mppt_2420_lc\src\main.o:C:\Users\user\source\repos\charge-controller-firmware/src/main.cpp:31: first defined here
c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/…/lib/gcc/arm-none-eabi/8.2.1/…/…/…/…/arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC\CMakeCCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC/CMakeCCompilerId.c:634: multiple definition of info_language_dialect_default'; .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX\CMakeCXXCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX/CMakeCXXCompilerId.cpp:621: first defined here c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/8.2.1/../../../../arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC\CMakeCCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC/CMakeCCompilerId.c:615: multiple definition of info_arch’; .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX\CMakeCXXCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX/CMakeCXXCompilerId.cpp:600: first defined here
c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/…/lib/gcc/arm-none-eabi/8.2.1/…/…/…/…/arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC\CMakeCCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC/CMakeCCompilerId.c:614: multiple definition of info_platform'; .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX\CMakeCXXCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX/CMakeCXXCompilerId.cpp:599: first defined here c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/8.2.1/../../../../arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC\CMakeCCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdC/CMakeCCompilerId.c:321: multiple definition of info_compiler’; .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX\CMakeCXXCompilerId.o:C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\3.17.20032601-MSVC_2\CompilerIdCXX/CMakeCXXCompilerId.cpp:306: first defined here
c:/users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/…/lib/gcc/arm-none-eabi/8.2.1/…/…/…/…/arm-none-eabi/bin/ld.exe: .pio\build\mppt_2420_lc\src\out\build\x64-Debug (default)\CMakeFiles\ShowIncludes\main.o: in function main': C:\Users\user\source\repos\charge-controller-firmware/src\out\build\x64-Debug (default)\CMakeFiles\ShowIncludes/main.c:2: multiple definition of main’; .pio\build\mppt_2420_lc\src\main.o:C:\Users\user\source\repos\charge-controller-firmware/src/main.cpp:31: first defined here
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\mppt_2420_lc\firmware-pre.elf] Error 1

martinjaeger · October 24, 2020, 9:44am

That’s strange and seems to be an issue in the toolchain. Two suggestions:

Delete the generated .pio folder in the firmware directory and build again.
Upgrade to most recent release of platformio by setting platform = ststm32@~8.1.0 in platformio.ini.

Let me know if that fixed the issues.

derhaegr · October 24, 2020, 3:40pm

Both options did not work so i tried to reinstall. Now its even worse:

Processing mppt_2420_lc (board: mppt_2420_lc; platform: ststm32@~8.0.0; framework: zephyr)

Verbose mode can be enabled via -v, --verbose option
CONFIGURATION: https://docs.platformio.org/page/boards/ststm32/mppt_2420_lc.html
PLATFORM: ST STM32 (8.0.0) > Libre Solar MPPT 2420 LC
HARDWARE: STM32F072RBT6 48MHz, 16KB RAM, 128KB Flash
DEBUG: Current (stlink) On-board (stlink) External (blackmagic, jlink)
PACKAGES:

framework-zephyr 2.20300.200823 (2.3.0)
framework-zephyr-canopennode 0.0.0-alpha+sha.5c6b0566d5
framework-zephyr-civetweb 0.0.0-alpha+sha.99129c5efc
framework-zephyr-cmsis 0.0.0-alpha+sha.542b2296e6
framework-zephyr-fatfs 0.0.0-alpha+sha.9ee6b9b951
framework-zephyr-hal-st 0.0.0-alpha+sha.5b3ec3e182
framework-zephyr-hal-stm32 0.0.0-alpha+sha.d1bc80d021
framework-zephyr-libmetal 0.0.0-alpha+sha.3c3c9ec83b
framework-zephyr-littlefs 0.0.0-alpha+sha.0aefdda69d
framework-zephyr-loramac-node 0.0.0-alpha+sha.29e516ec58
framework-zephyr-lvgl 0.0.0-alpha+sha.74fc2e753a
framework-zephyr-mbedtls 0.0.0-alpha+sha.4bf099f125
[WinError 145] De map is niet leeg: ‘C:\Users\user\source\repos\charge-controller-firmware\charge-controller-firmware\.pio\build\mppt_2420_lc’
Please manually remove the file C:\Users\user\source\repos\charge-controller-firmware\charge-controller-firmware\.pio\build\mppt_2420_lc - framework-zephyr-mcuboot 0.0.0-alpha+sha.e88113bbeb
framework-zephyr-mcumgr 0.0.0-alpha+sha.5885efb7ca
framework-zephyr-mipi-sys-t 0.0.0-alpha+sha.957d46bc3c
framework-zephyr-open-amp 0.0.0-alpha+sha.724f7e2a45
framework-zephyr-openthread 0.0.0-alpha+sha.a83d18cf18
framework-zephyr-segger 0.0.0-alpha+sha.6fcf61606d
framework-zephyr-tinycbor 0.0.0-alpha+sha.40daca97b4
framework-zephyr-tinycrypt 0.0.0-alpha+sha.3e9a49d267
framework-zephyr-trusted-firmware-m 0.0.0-alpha+sha.7de2daa196
tool-cmake 3.16.4
tool-dtc 1.4.7
tool-ninja 1.9.0
toolchain-gccarmnoneeabi 1.80201.190214 (8.2.1)
Reading CMake configuration…
– Application: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/zephyr
– Zephyr version: 2.3.0 (C:/Users/user/.platformio/packages/framework-zephyr)
– Found Python3: C:/Users/user/.platformio/penv/Scripts/python.exe (found suitable exact version “3.7.7”) found components: Interpreter
– Board: mppt_2420_lc
– Found dtc: C:/Users/user/.platformio/packages/tool-dtc/dtc.exe (found suitable version “1.4.7”, minimum required is “1.4.6”)
– Found toolchain: gnuarmemb (C:/Users/user/.platformio/packages/toolchain-gccarmnoneeabi)
– Found BOARD.dts: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/boards/arm/mppt_2420_lc/mppt_2420_lc.dts
– Generated zephyr.dts: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/zephyr.dts
– Generated devicetree_unfixed.h: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/include/generated/devicetree_unfixed.h
Parsing C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/zephyr/Kconfig

Loaded configuration ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/boards/arm/mppt_2420_lc/mppt_2420_lc_defconfig’

Merged configuration ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/zephyr/prj.conf’

Configuration saved to ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/.config’

Kconfig header saved to ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/include/generated/autoconf.h’

– The C compiler identification is GNU 8.2.1
– The CXX compiler identification is GNU 8.2.1
– The ASM compiler identification is GNU
– Found assembler: C:/Users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/arm-none-eabi-gcc.exe
– Cache files will be written to: C:/Users/user/.platformio/packages/framework-zephyr/.cache
– Could NOT find Git (missing: GIT_EXECUTABLE)
– Configuring incomplete, errors occurred!
See also “C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/CMakeFiles/CMakeOutput.log”.
See also “C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/CMakeFiles/CMakeError.log”.

Including boilerplate (Zephyr base): C:/Users/user/.platformio/packages/framework-zephyr/cmake/app/boilerplate.cmake
Python path: C:/Users/user/.platformio/penv/Scripts/python.exe
CMake Error at CMakeLists.txt:13 (add_subdirectory):
The source directory

C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/lib/thingset

does not contain a CMakeLists.txt file.

CMake Error at CMakeLists.txt:14 (add_subdirectory):
The source directory

C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/lib/oled-display

does not contain a CMakeLists.txt file.

=============================================================================== [FAILED] Took 5.54 seconds ===============================================================================

Environment Status Duration

mppt_2420_lc FAILED 00:00:05.543
========================================================================= 1 failed, 0 succeeded in 00:00:05.543 =========================================================================
The terminal process “C:\Users\user.platformio\penv\Scripts\platformio.exe ‘run’” terminated with exit code: 1.

Terminal will be reused by tasks, press any key to close it.

Executing task in folder charge-controller-firmware: C:\Users\user.platformio\penv\Scripts\platformio.exe run <

Processing mppt_2420_lc (board: mppt_2420_lc; platform: ststm32@~8.0.0; framework: zephyr)

Verbose mode can be enabled via -v, --verbose option
CONFIGURATION: https://docs.platformio.org/page/boards/ststm32/mppt_2420_lc.html
PLATFORM: ST STM32 (8.0.0) > Libre Solar MPPT 2420 LC
HARDWARE: STM32F072RBT6 48MHz, 16KB RAM, 128KB Flash
DEBUG: Current (stlink) On-board (stlink) External (blackmagic, jlink)
PACKAGES:

framework-zephyr 2.20300.200823 (2.3.0)
framework-zephyr-canopennode 0.0.0-alpha+sha.5c6b0566d5
framework-zephyr-civetweb 0.0.0-alpha+sha.99129c5efc
framework-zephyr-cmsis 0.0.0-alpha+sha.542b2296e6
framework-zephyr-fatfs 0.0.0-alpha+sha.9ee6b9b951
framework-zephyr-hal-st 0.0.0-alpha+sha.5b3ec3e182
framework-zephyr-hal-stm32 0.0.0-alpha+sha.d1bc80d021
framework-zephyr-libmetal 0.0.0-alpha+sha.3c3c9ec83b
framework-zephyr-littlefs 0.0.0-alpha+sha.0aefdda69d
framework-zephyr-loramac-node 0.0.0-alpha+sha.29e516ec58
framework-zephyr-lvgl 0.0.0-alpha+sha.74fc2e753a
framework-zephyr-mbedtls 0.0.0-alpha+sha.4bf099f125
framework-zephyr-mcuboot 0.0.0-alpha+sha.e88113bbeb
framework-zephyr-mcumgr 0.0.0-alpha+sha.5885efb7ca
framework-zephyr-mipi-sys-t 0.0.0-alpha+sha.957d46bc3c
framework-zephyr-open-amp 0.0.0-alpha+sha.724f7e2a45
framework-zephyr-openthread 0.0.0-alpha+sha.a83d18cf18
framework-zephyr-segger 0.0.0-alpha+sha.6fcf61606d
framework-zephyr-tinycbor 0.0.0-alpha+sha.40daca97b4
framework-zephyr-tinycrypt 0.0.0-alpha+sha.3e9a49d267
framework-zephyr-trusted-firmware-m 0.0.0-alpha+sha.7de2daa196
tool-cmake 3.16.4
tool-dtc 1.4.7
tool-ninja 1.9.0
toolchain-gccarmnoneeabi 1.80201.190214 (8.2.1)
Reading CMake configuration…
– Application: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/zephyr
– Zephyr version: 2.3.0 (C:/Users/user/.platformio/packages/framework-zephyr)
– Found Python3: C:/Users/user/.platformio/penv/Scripts/python.exe (found suitable exact version “3.7.7”) found components: Interpreter
– Board: mppt_2420_lc
– Found dtc: C:/Users/user/.platformio/packages/tool-dtc/dtc.exe (found suitable version “1.4.7”, minimum required is “1.4.6”)
– Found toolchain: gnuarmemb (C:/Users/user/.platformio/packages/toolchain-gccarmnoneeabi)
– Found BOARD.dts: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/boards/arm/mppt_2420_lc/mppt_2420_lc.dts
– Generated zephyr.dts: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/zephyr.dts
– Generated devicetree_unfixed.h: C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/include/generated/devicetree_unfixed.h
Parsing C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/zephyr/Kconfig

Loaded configuration ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/boards/arm/mppt_2420_lc/mppt_2420_lc_defconfig’

Merged configuration ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/zephyr/prj.conf’

Configuration saved to ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/.config’

Kconfig header saved to ‘C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/zephyr/include/generated/autoconf.h’

– The C compiler identification is GNU 8.2.1
– The CXX compiler identification is GNU 8.2.1
– The ASM compiler identification is GNU
– Found assembler: C:/Users/user/.platformio/packages/toolchain-gccarmnoneeabi/bin/arm-none-eabi-gcc.exe
– Cache files will be written to: C:/Users/user/.platformio/packages/framework-zephyr/.cache
– Could NOT find Git (missing: GIT_EXECUTABLE)
– Configuring incomplete, errors occurred!
See also “C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/CMakeFiles/CMakeOutput.log”.
See also “C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/.pio/build/mppt_2420_lc/CMakeFiles/CMakeError.log”.

Including boilerplate (Zephyr base): C:/Users/user/.platformio/packages/framework-zephyr/cmake/app/boilerplate.cmake
Python path: C:/Users/user/.platformio/penv/Scripts/python.exe
CMake Error at CMakeLists.txt:13 (add_subdirectory):
The source directory

C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/lib/thingset

does not contain a CMakeLists.txt file.

CMake Error at CMakeLists.txt:14 (add_subdirectory):
The source directory

C:/Users/user/source/repos/charge-controller-firmware/charge-controller-firmware/lib/oled-display

does not contain a CMakeLists.txt file.

martinjaeger · October 24, 2020, 3:57pm

You didn’t follow the README in the charge controller repository, as it seems like you didn’t clone the repository recursively. You also need to have git installed for that, of course.

derhaegr · October 24, 2020, 4:38pm

Thank you!
I do not understand what went wrong the first time. I do have Git installed so i cloned again and this time the build was fine without any problems!
I was able to build 4 firmwares.
I also want to note “Visual Studio Code” is a requirment i noticed somewhere.

martinjaeger · October 24, 2020, 5:10pm

Great that it works now.

VS Code is not really a requirement, but it’s the most easy way to get started. You can basically use any editor you like and build + flash the firmware from the command line. Even on the command line you have two options: PlatformIO (which is just a Python package, so it’s easy to install) or the Zephyr native SDK using the west tool (which requires a bit more of setup).

rkwijesekara · October 30, 2020, 5:50pm

Hi Martin, can you please add pick place file as csv or excel format? jlcpcb not accepting test format. or u can mail me. rkwije79@gmail.com
thanks

martinjaeger · November 8, 2020, 4:48pm

You can export the pick&place files from KiCad, similar to the gerber files as explained here.