License

Owl is the product of several years of development by the Rice Computer Architecture Group at Rice University and a collection of wonderful open-source software projects. Combined, they provide an open-source environment for programming microcontrollers that is free and easy to use.

This release combines work from:

Each source file contains a header that explains the license that applies to that particular file. The majority of the system, including the complete virtual machine and Python library, is provided under the MIT license. The FFI subsystem is provided under the libffi license, which is identical to the MIT license.

However, some support code, including but not limited to the linker scripts for the Stellaris microcontrollers, is provided under the GNU Lesser GPL. This license is compatible with the MIT license with some exceptions.

Owl links in portions of Driverlib and USBlib, the peripheral driver libraries distributed as a part of Texas Instrument’s Stellarisware. Driverlib is provided by TI under the BSD license, and USBlib is provided under a proprietary, re-distributable license.

Any user wishing to redistribute Owl should ensure that he or she is complying with the licenses for all the code contained therein. For reference, the various licenses used in this project are quoted here. This document should not be considered to be authoritative; the license statements in each file should be used for reference:

MIT License (Core VM, toolchain, libraries)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

libffi license (FFI subsystem)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

GNU Lesser General Public License (Version 3, Linker script, initialization routines)

GNU LESSER GENERAL PUBLIC LICENSE Version 3, 29 June 2007

This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below.

Additional Definitions.

As used herein, “this License” refers to version 3 of the GNU Lesser General Public License, and the “GNU GPL” refers to version 3 of the GNU General Public License.

“The Library” refers to a covered work governed by this License, other than an Application or a Combined Work as defined below.

An “Application” is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library.

A “Combined Work” is a work produced by combining or linking an Application with the Library. The particular version of the Library with which the Combined Work was made is also called the “Linked Version”.

The “Minimal Corresponding Source” for a Combined Work means the Corresponding Source for the Combined Work, excluding any source code for portions of the Combined Work that, considered in isolation, are based on the Application, and not on the Linked Version.

The “Corresponding Application Code” for a Combined Work means the object code and/or source code for the Application, including any data and utility programs needed for reproducing the Combined Work from the Application, but excluding the System Libraries of the Combined Work.

Exception to Section 3 of the GNU GPL.

You may convey a covered work under sections 3 and 4 of this License without being bound by section 3 of the GNU GPL.

Conveying Modified Versions.

If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version:

a) under this License, provided that you make a good faith effort to ensure that, in the event an Application does not supply the unction or data, the facility still operates, and performs whatever part of its purpose remains meaningful, or

b) under the GNU GPL, with none of the additional permissions of this License applicable to that copy.

Object Code Incorporating Material from Library Header Files.

The object code form of an Application may incorporate material from a header file that is part of the Library. You may convey such object code under terms of your choice, provided that, if the incorporated material is not limited to numerical parameters, data structure layouts and accessors, or small macros, inline functions and templates (ten or fewer lines in length), you do both of the following:

a) Give prominent notice with each copy of the object code that the Library is used in it and that the Library and its use are covered by this License.

b) Accompany the object code with a copy of the GNU GPL and this license document.

Combined Works.

You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications, if you also do each of the following:

a) Give prominent notice with each copy of the Combined Work that the Library is used in it and that the Library and its use are covered by this License.

b) Accompany the Combined Work with a copy of the GNU GPL and this license document.

c) For a Combined Work that displays copyright notices during execution, include the copyright notice for the Library among these notices, as well as a reference directing the user to the copies of the GNU GPL and this license document.

d) Do one of the following:

0) Convey the Minimal Corresponding Source under the terms of this License, and the Corresponding Application Code in a form suitable for, and under terms that permit, the user to recombine or relink the Application with a modified version of the Linked Version to produce a modified Combined Work, in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source.

1) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user’s computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version.

e) Provide Installation Information, but only if you would otherwise be required to provide such information under section 6 of the GNU GPL, and only to the extent that such information is necessary to install and execute a modified version of the Combined Work produced by recombining or relinking the Application with a modified version of the Linked Version. (If you use option 4d0, the Installation Information must accompany the Minimal Corresponding Source and Corresponding Application Code. If you use option 4d1, you must provide the Installation Information in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source.)

Combined Libraries.

You may place library facilities that are a work based on the Library side by side in a single library together with other library facilities that are not Applications and are not covered by this License, and convey such a combined library under terms of your choice, if you do both of the following:

a) Accompany the combined library with a copy of the same work based on the Library, uncombined with any other library facilities, conveyed under the terms of this License.

b) Give prominent notice with the combined library that part of it is a work based on the Library, and explaining where to find the accompanying uncombined form of the same work.

Revised Versions of the GNU Lesser General Public License.

The Free Software Foundation may publish revised and/or new versions of the GNU Lesser General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.

Each version is given a distinguishing version number. If the Library as you received it specifies that a certain numbered version of the GNU Lesser General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that published version or of any later version published by the Free Software Foundation. If the Library as you received it does not specify a version number of the GNU Lesser General Public License, you may choose any version of the GNU Lesser General Public License ever published by the Free Software Foundation.

If the Library as you received it specifies that a proxy can decide whether future versions of the GNU Lesser General Public License shall apply, that proxy’s public statement of acceptance of any version is permanent authorization for you to choose that version for the Library.

BSD License (driverlib)

Software License Agreement

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the original copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the original copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

Neither the name of Texas Instruments Incorporated nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

TI USBlib license

TI StellarisWare Clickwrap Software License Agreement (SLA)

Important - This is a legally binding agreement. Read it carefully. After you read the following terms, you will be asked whether you are authorized to commit your company to abide by the following terms. THIS AGREEMENT IS DISPLAYED FOR YOU TO READ PRIOR TO DOWNLOADING OR USING THE “LICENSED MATERIALS”.

DO NOT DOWNLOAD OR INSTALL the software programs unless you agree on behalf of yourself and your company to be bound by the terms of this License Agreement.

DO NOT CLICK “I AGREE” UNLESS:

YOU ARE AUTHORIZED TO AGREE TO THE TERMS OF THIS LICENSE ON BEHALF OF YOURSELF AND YOUR COMPANY; AND
YOU INTEND TO ENTER THIS LEGALLY BINDING AGREEMENT ON BEHALF OF YOURSELF AND YOUR COMPANY.

Important - Read carefully: This software license agreement (“Agreement”) is a legal agreement between you (either an individual or entity) and Texas Instruments Incorporated (“TI”). The “Licensed Materials” subject to this Agreement include the software programs TI has granted you access to download and any “on-line” or electronic documentation associated with these programs, or any portion thereof, and may also include hardware, reference designs and associated documentation. The Licensed Materials are specifically designed and licensed for use solely and exclusively with microprocessor/microcontroller devices manufactured by or for TI (“TI Devices”). By installing, copying or otherwise using the Licensed Materials you agree to abide by the provisions set forth herein. This Agreement is displayed for you to read prior to using the Licensed Materials. If you choose not to accept or agree with these provisions, do not download or install the Licensed Materials.

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Intellectual Property Rights.

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b. Governing Language. This Agreement is written and executed in the English language. If a translation of this Agreement is required for any purpose, including but not limited to registration of the Agreement pursuant to any governmental laws, regulations or rules, you shall be solely responsible for creating such translation. Any translation of this Agreement into a language other than English is intended solely in order to comply with such laws or for reference purposes, and the English language version shall be authoritative and controlling.

c. Export Control.

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(ii). Assurance of Compliance. You understand and acknowledge that products, technology (regardless of the form in which it is provided), software or software source code, received from TI or any of its affiliates under this Agreement may be under export control of the United States or other countries. You shall comply with the United States and other applicable non-U.S. laws and regulations governing the export, re-export and release of any products, technology, software, or software source code received under this Agreement from TI or its affiliates. You shall not undertake any action that is prohibited by the EAR. Without limiting the generality of the foregoing, you specifically agree that you shall not transfer or release products, technology, software, or software source code of TI or its affiliates to, or for use by, military end users or for use in military, missile, nuclear, biological, or chemical weapons end uses.

(iii). Licenses. Each party shall secure at its own expense, such licenses and export and import documents as are necessary for each respective party to fulfill its obligations under this Agreement. If such licenses or government approvals cannot be obtained, TI may terminate this Agreement, or shall otherwise be excused from the performance of any obligations it may have under this Agreement for which the licenses or government approvals are required.

Entire Agreement. This is the entire Agreement between you and TI, and absent a signed and effective software license agreement related to the subject matter of this Agreement, this Agreement supersedes any prior agreement between the parties related to the subject matter of this Agreement. Notwithstanding the foregoing, any signed and effective software license agreement relating to the subject matter hereof will supersede the terms of this Agreement. No amendment or modification of this Agreement will be effective unless in writing and signed by a duly authorized representative of TI. You hereby warrant and represent that you have obtained all authorizations and other applicable consents required empowering you to enter into this Agreement.