3939c992d4
* Use compile-time detection of hardware CRC capability, so unneeded code and tables do not go into the image. * Add global JSON config option to allow choice between no tables, 16-entry tables or 256-entry tables for software CRC. Default set to 16-entry, reducing ROM size from previous 256-entry. * Allow manual override in template parameter to force software or bitwise CRC for a particular instance. * Micro-optimisations, particularly use of `RBIT` instruction and optimising bitwise computation using inline assembler. Incompatible changes: * Remove special-case "POLY_32BIT_REV_ANSI" - users can use standard POLY_32BIT_ANSI, which now uses the same 16-entry tables by default, or can use hardware acceleration, which was disabled for POLY_32BIT_REV_ANSI. MbedCRC<POLY_32BIT_ANSI, 32, CrcMode::TABLE> can be used to force software like POLY_32BIT_REV_ANSI. * The precomputed table for POLY_16BIT_IBM had errors - this has been corrected, but software CRC results will be different from the previous software calculation. * < 8-bit CRC results are no longer are shifted up in the output value, but placed in the lowest bits, like other sizes. This means that code performing the SD command CRC will now need to use `(crc << 1) | 1`, rather than `crc | 1`. |
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README.md
Arm Mbed OS is an open source embedded operating system designed specifically for the "things" in the Internet of Things. It includes all the features you need to develop a connected product based on an Arm Cortex-M microcontroller, including security, connectivity, an RTOS and drivers for sensors and I/O devices.
Mbed OS provides a platform that includes:
- Security foundations.
- Cloud management services.
- Drivers for sensors, I/O devices and connectivity.
Release notes
The release notes detail the current release. You can also find information about previous versions.
License and contributions
The software is provided under the Apache-2.0 license. Contributions to this project are accepted under the same license. Please see contributing.md for more information.
This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide.
Folders containing files under different permissive license than Apache 2.0 are listed in the LICENSE file.
Getting started for developers
We have a developer website for asking questions, engaging with others, finding information on boards and components, using an online IDE and compiler, reading the documentation and learning about what's new and what's coming next in Mbed OS.
Getting started for contributors
We also have a contributing and publishing guide that covers licensing, contributor agreements and style guidelines.
Documentation
For more information about Mbed OS, please see our published documentation. It includes Doxygen for our APIs, step-by-step tutorials, porting information and background reference materials about our architecture and tools.
To contribute to this documentation, please see the mbed-os-5-docs repository.