Switch branches/tags
Nothing to show
Find file History
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
..
Failed to load latest commit information.
assets
source
.catalog_metadata
.gitignore
.yotta.json
README.md
module.json
requirements.txt

README.md

#215 OSHChip/YottaToolchain

Build a simple program using the Official Yotta target for OSHChip and gcc on MacOSX

▶️ return to the LEAP Catalog

Notes

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.

First - Don't Do This

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

Try The Real Way

Use brew and pip!

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.

Initialise the Project

$ 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 oshchip-gcc@1.1.4 from the public module registry
info: get versions for nordic-nrf51822-gcc
info: download nordic-nrf51822-gcc@1.0.0 from the public module registry
info: get versions for mbed-gcc
info: download mbed-gcc@1.2.2 from the public module registry
$ yotta install mbed-drivers
info: mbed-drivers, *
info: get versions for mbed-drivers
info: download mbed-drivers@1.5.0 from the public module registry
info: dependency mbed-drivers: ^1.5.0 written to module.json
info: get versions for mbed-hal
info: download mbed-hal@1.3.0 from the public module registry
info: get versions for cmsis-core
info: download cmsis-core@1.2.0 from the public module registry
info: get versions for ualloc
info: download ualloc@1.3.0 from the public module registry
info: get versions for minar
info: download minar@1.3.0 from the public module registry
info: get versions for core-util
info: download core-util@1.8.0 from the public module registry
info: get versions for compiler-polyfill
info: download compiler-polyfill@1.3.0 from the public module registry
info: get versions for greentea-client
info: download greentea-client@1.1.0 from the public module registry
info: get versions for mbed-hal-nordic
info: download mbed-hal-nordic@2.1.0 from the public module registry
info: get versions for mbed-hal-nrf51822-mcu
info: download mbed-hal-nrf51822-mcu@2.2.0 from the public module registry
info: get versions for nrf51-sdk
info: download nrf51-sdk@2.4.0 from the public module registry
info: get versions for mbed-hal-mkit
info: download mbed-hal-mkit@1.1.0 from the public module registry
info: get versions for cmsis-core-nordic
info: download cmsis-core-nordic@1.1.0 from the public module registry
info: get versions for cmsis-core-nrf51822
info: download cmsis-core-nrf51822@1.4.0 from the public module registry
info: get versions for dlmalloc
info: download dlmalloc@1.1.0 from the public module registry
info: get versions for minar-platform
info: download minar-platform@1.1.0 from the public module registry
info: get versions for minar-platform-mbed
info: download minar-platform-mbed@1.3.0 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.

Write a Program!

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

Build It

$ 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
...

Send it to the OSHChip

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.

Construction

The Build

Credits and References