mbed SDK is now open source

in compilers, open source by the machinegeek | 8 comments

mbed-sdk-open-source
The mbed MCU platform’s SDK is now open source. The mbed crew reports,

The mbed Software Development Kit (SDK) is a C/C++ microcontroller software platform already relied upon by tens of thousands of developers to write code for ARM microcontrollers. It has always been free for commercial and noncommercial use, but this latest release under an open source license will extend its applicability further to be relied on in more commercial, open source and educational projects.

Visit mbed.org for downloads and more information.

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Comments

  1. bearmos says:

    this is phenomenal – i was hoping they really would open it up and it wasn’t just talk!

  2. mossmann says:

    I call BS. “It is built on the low-level ARM CMSIS APIs” which are not open source.

  3. Simon says:

    CMSIS is the standard base C hal for cortex-M that all the different microcontroller vendors publish; the base source code is from http://www.arm.com/cmsis and the vendors sites have the source for their port of it on their sites

    • bearmos says:

      If this is Simon Ford – I’d like to say “thank you” for opening up these libs and great job in creating them.

      In my opinion – one of the encouraging things about the mbed libs was that they used CMSIS – making porting to a new platform faster.

      While this works fine in a non-open source project, I’m not sure how the vendors would like having their CMSIS libs redistributed.

      Personally, I don’t know enough about all of the different licenses (or lack thereof) a license to make sense of whether CMSIS is “open”, but for the MCU’s I use (STM), their “license” reads as follows:
      License

      The enclosed firmware and all the related documentation are not covered by a License Agreement, if you need such License you can contact your local STMicroelectronics office.

      THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

      They also have a copyright notice, so I’m not sure where that leaves things for an open-source project that would want to redistribute the CMSIS portions.

  4. Simon says:

    I believe the intent is there for CMSIS but i agree it is not as obvious as if it under a recognised license like the apache 2.0 we used for the mbed SDK. The CMSIS effort was to help standardisation and coding for everyone, and if this is falling short for some people because of licensing familiarity/concerns, i’ll do my best to encourage adoption of a standard OS licenses for all of CMSIS too (may take some time!)

  5. mossmann says:

    If you can’t get the code with an explicit open source license, it is not open source. Simon, If you can do anything to encourage CMSIS to adopt an open source license, the community would be grateful. As it stands now, open source projects are forced to reinvent the wheel (e.g. libopencm3). Worse, there are many projects that claim to be open source and turn out not to be because they are built on CMSIS.

  6. Emilio Monti says:

    The CMSIS software components used by the mbed SDK have been released under a permissive BSD open source license!

    http://mbed.org/blog/entry/CMSIS-Components-BSD-Licensed/

  7. mossmann says:

    BS again. Show us the code. Show us the license.

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