f1c4a7fe52
All STM32 families except STM32H7 has the following 3-wire SPI peculiarity in master receive mode: SPI continuously generates clock signal till it's disabled by a software. It causes that a software must disable SPI in time. Otherwise, "dummy" reads will be generated. Current STM32 synchronous SPI 3-wire implementation relies on HAL library functions HAL_SPI_Receive/HAL_SPI_Transmit. It performs some SPI state checks to detect errors, but unfortunately it isn't fast enough to disable SPI in time. Additionally, a multithreading environment or interrupt events may cause extra delays. This commit contains the custom transmit/receive function for SPI 3-wire mode. It uses critical sections to prevents accidental interrupt event delays, disables SPI after each frame receiving and disables SPI during frame generation. It adds some delay between SPI frames (~700 ns), but gives reliable 3-wire SPI communications. |
||
|---|---|---|
| .github | ||
| TESTS | ||
| UNITTESTS | ||
| cmsis | ||
| connectivity | ||
| docker_images/mbed-os-env | ||
| docs | ||
| drivers | ||
| events | ||
| extern | ||
| features | ||
| hal | ||
| platform | ||
| rtos | ||
| storage | ||
| targets | ||
| tools | ||
| .astylerc | ||
| .codecheckignore | ||
| .coveragerc | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .lgtm.yml | ||
| .mergify.yml | ||
| .pylintrc | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| DOXYGEN_FRONTPAGE.md | ||
| Jenkinsfile | ||
| LICENSE-apache-2.0.txt | ||
| LICENSE.md | ||
| README.md | ||
| doxyfile_options | ||
| doxygen_options.json | ||
| logo.png | ||
| mbed.h | ||
| requirements.txt | ||
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.