352e6fbd23
Some LoRaWAN modem like SX1272 can receive downlink packets with RSSI level less than -127. So "int8_t" is not enough for store all possible RSSI values. For example, SX1272 has sensitivity at -137 dBm. Problem was manifested in the file "SX1272_LoRaRadio.cpp" at SX1272_LoRaRadio::handle_dio0_irq() method. When value of _rf_settings.lora_packet_handler.rssi_value calculated incorrect RSSI will be stored. Example case: Value readen from register REG_LR_PKTSNRVALUE _rf_settings.lora_packet_handler.snr_value equals -47. Value readen from register REG_LR_PKTRSSIVALUE equals 17. RSSI_OFFSET equals "-139", snr equals "-11". For case MODEM_LORA value calculated by formula: _rf_settings.lora_packet_handler.rssi_value = RSSI_OFFSET + rssi + (rssi >> 4) + snr; and result value will be "124" because of int8_t overflow so it's not correct value (too high). Correct value must be: -139 + 17 + (1) + (-11) = -132. Another motivation: at all other places int16_t type used to store RSSI value. |
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| cmsis | ||
| connectivity | ||
| docker_images/mbed-os-env | ||
| docs | ||
| drivers | ||
| events | ||
| extern | ||
| features | ||
| hal | ||
| platform | ||
| rtos | ||
| storage | ||
| targets | ||
| tools | ||
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| .gitignore | ||
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| .mergify.yml | ||
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| 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.