Build a simple program using the Official Yotta target for OSHChip and gcc on MacOSX
After bruising myself on the raw GccToolchain - and although I got a program running - I'm thinking I want my toolchain to do more of the hard work for me!
So let's try yotta, the software module system used by mbed OS.
The OSX Installer from mbed yotta
looked like the easy path. But after installing, I started seeing certificate verify failed errors when yotta
tried to contact the yotta registry.
Turns out this is a very old build (despite just downloading minutes ago)..
$ yotta --version
0.8.3
This procedure is outlined on yottadocs.
$ brew tap ARMmbed/homebrew-formulae
$ brew install cmake ninja arm-none-eabi-gcc
NB: I already have python installed, so I skipped the brew install python.
Before installing yotta, I used virtualenv to create and activate an isolated python environment for yotta development:
$ virtualenv venv
$ source venv/bin/activate
Next install yotta:
$ pip install yotta
# or use the requirements.txt file I have here:
$ pip install -r requirements.txt
How are we doing?
$ yotta --version
0.16.4
.. that's looking a bit more healthy.
$ yotta init
Enter the module name: <yottatoolchain>
Enter the initial version: <0.0.0>
Is this an executable (instead of a re-usable library module)? <no> yes
Short description:
Author:
What is the license for this project (Apache-2.0, ISC, MIT etc.)? <Apache-2.0>
$ yotta target oshchip-gcc
info: get versions for oshchip-gcc
info: download [email protected] from the public module registry
info: get versions for nordic-nrf51822-gcc
info: download [email protected] from the public module registry
info: get versions for mbed-gcc
info: download [email protected] from the public module registry
$ yotta install mbed-drivers
info: mbed-drivers, *
info: get versions for mbed-drivers
info: download [email protected] from the public module registry
info: dependency mbed-drivers: ^1.5.0 written to module.json
info: get versions for mbed-hal
info: download [email protected] from the public module registry
info: get versions for cmsis-core
info: download [email protected] from the public module registry
info: get versions for ualloc
info: download [email protected] from the public module registry
info: get versions for minar
info: download [email protected] from the public module registry
info: get versions for core-util
info: download [email protected] from the public module registry
info: get versions for compiler-polyfill
info: download [email protected] from the public module registry
info: get versions for greentea-client
info: download [email protected] from the public module registry
info: get versions for mbed-hal-nordic
info: download [email protected] from the public module registry
info: get versions for mbed-hal-nrf51822-mcu
info: download [email protected] from the public module registry
info: get versions for nrf51-sdk
info: download [email protected] from the public module registry
info: get versions for mbed-hal-mkit
info: download [email protected] from the public module registry
info: get versions for cmsis-core-nordic
info: download [email protected] from the public module registry
info: get versions for cmsis-core-nrf51822
info: download [email protected] from the public module registry
info: get versions for dlmalloc
info: download [email protected] from the public module registry
info: get versions for minar-platform
info: download [email protected] from the public module registry
info: get versions for minar-platform-mbed
info: download [email protected] from the public module registry
NB: the transcript above wasn't the first time I ran those commands.
The first time I did the yotta install mbed-drivers it punched me out to the mbed site for authentication.
Or in this case, "borrow" it from target-OSHChip-gcc/*/examples/blinky.cpp!
$ curl -Lo source/blinky.cpp https://github.com/OSHChip/target-OSHChip-gcc/blob/master/examples/blinky.cpp?raw=true
$ yotta build
info: generate for target: oshchip-gcc 1.1.4 at /Users/paulgallagher/MyGithub/LittleArduinoProjects/OSHChip/YottaToolchain/yotta_targets/oshchip-gcc
warning: subdirectory "test" of yottatoolchain 0.0.0 at /Users/paulgallagher/MyGithub/LittleArduinoProjects/OSHChip/YottaToolchain was ignored because it doesn't appear to contain any source files
GCC version is: 5.3.1
omit frame pointer for bootloader startup asm
suppressing warnings from nrf51-sdk
-- The ASM compiler identification is GNU
-- Found assembler: /usr/local/bin/arm-none-eabi-gcc
-- Configuring done
-- Generating done
-- Build files have been written to:
[ .. etc etc etc .. and a worrying large number of compiler warnings later ... ]
[126/126] Linking CXX executable source/yottatoolchain
Memory usage for 'yottatoolchain'
section size
.data 184
.bss 768
.heap 19528
.stack 2048
It's done. Now where's my program? Found it, yottatoolchain-combined.hex weighing in at a handsome 404kb!
$ ls -sk1 build/oshchip-gcc/source/
total 1308
0 CMakeFiles
4 CMakeLists.txt
4 CTestTestfile.cmake
4 cmake_install.cmake
428 yottatoolchain
404 yottatoolchain-combined.hex
40 yottatoolchain.bin
112 yottatoolchain.hex
312 yottatoolchain.map
Looking at the the first few lines of yottatoolchain-combined.hex I can see it setting:
- Start Linear Address: 0x0001CBF1
- Extended Linear Address: 0x0000 upper 16 bits
:040000050001CBF13A
:020000040000FA
:10000000C0070000D1060000D1000000B1060000CA
:1000100000000000000000000000000000000000E0
:100020000000000000000000000000005107000078
...
I have the OSHchip & programmer plugged into my USB and appearing as /Volumes/Untitled/.
So copying it over...
$ cp build/oshchip-gcc/source/yottatoolchain-combined.hex /Volumes/Untitled/
Presto, the OSHChip rebooted and is now blinking the Red onboard LED every half a second.
