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2015.09: added release notes
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Oleg Hahm
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RIOT-2015.09 - Release Notes
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============================
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RIOT is a real-time multi-threading operating system that supports a range of
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devices that are typically found in the Internet of Things: devices based on
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8-bit microcontrollers, 16-bit microcontrollers and light-weight 32-bit
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processors.
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RIOT is based on the following design principles: energy-efficiency, real-time
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capabilities, small memory footprint, modularity, and uniform API access,
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independent of the underlying hardware (this API offers partial POSIX
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compliance).
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RIOT is developed by an international open source community which is
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independent of specific vendors (e.g. similarly to the Linux community).
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About this release:
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============
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This release introduces the GNRC network stack, a completely new, highly
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modularized and configurable IPv6/6LoWPAN stack. It also includes xtimer as a
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new timer subsystem for accurate short- and long-term timers. Moreover,
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peripheral drivers, board, and CPU support has been tidied up and contains
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about 50% less duplication in the build system.
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About 580 pull requests with about 2,500 commits have been merged since the
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last release and 120 additional issues have been solved. 62 people contributed
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code in 278 days. 2578 files have been touched with ~320,000 insertions and
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~134,000 deletions.
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Loose notations used below:
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============
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+ means new feature/item
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* means modified feature/item
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- means removed feature/item
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New features
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============
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General
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-------
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+ complete codebase now compiles with -Werror on all platforms
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Device support
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--------------
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+ vastly improved hardware abstraction, unified over all devices
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+ unified most common code
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* complete refactoring of MSP430 and ARM7 code
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Core
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----
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+ new timer subsystem: xtimer
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+ extended atomic API by compare-and-swap, increase/decrease and
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set-to-one/set-to-zero functions
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+ introduced a more energy-saving assert macro
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Network Stack
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-------------
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+ RFC compliant gnrc network stack (6LoWPAN, IPv6, UDP, RPL) major refactoring
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+ 6LoWPAN ND (including SLAAC)
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+ example applications working out of the box (gnrc_networking for the full
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gnrc experience, gnrc_border_router for a 6LoWPAN border router, and default
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for simple link layer connectivity)
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+ explicit support for border router
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+ auto-init for the network stack
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+ introduction of generic interfaces (netdev, netapi)
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+ introduction of a protocol-independent FIB
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+ introduction of a central packet buffer
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+ wireshark-supported protocol ZEP to send IEEE 802.15.4 frames over UDP on
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non-IEEE-802.15.4 devices
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+ support for SLIP and link-layers without addresses
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+ new low-level driver model
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+ new nativenet based directly on ethernet
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+ conn: general stack-independent transport layer API
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+ POSIX sockets ported for conn
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+ NHDP support
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Packages
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--------
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+ support for microCoAP
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+ CMSIS DSP
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Supported platforms
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-------------------
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Additional support for the following boards:
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+ Zolertia ReMote
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+ Atmel SAML21 Xplained Pro (saml21-xpro)
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+ ST Nucleo L1
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+ ST Nucleo F334
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+ ST Nucleo F091
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+ Phytec phyWAVE KW22
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+ Eistec Mulle
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+ Freescale Freedom FRDM-K64F
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+ TI Stellaris Launchpad LM4F120
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+ LimiFrog V1
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+ Silabs EZR32WG
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Drivers
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-------
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+ various peripheral drivers (ADC, UART, timer, SPI, I²C, RTC, RTT, DAC, PWM...)
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+ basic NVRAM driver (interface)
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Network drivers
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+ native ethernet driver
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+ ENCx24J600 ethernet driver
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Sensors drivers
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+ ISL29125 RGB light sensor
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+ PDC8544 LCD display
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+ INA220 current and power monitor
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+ MPU-9150 9-DOF motion sensor
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+ LIS3DH accelerometer
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+ TMP006 temperature sensor
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+ MAG3110 magnetometer
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+ MMA8652 accelerometer
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+ DHT11/DHT22 temperature-humidity sensor
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+ ADT7310 temperature sensor
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System libraries
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----------------
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+ MD5
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+ Fletcher's checksum
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+ Unified Cipher API and Block cipher operation modes: ECB, CBC, CTR and CCM
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+ Bitfield operations
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+ thread safe ringbuffer
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+ vtimer compatibility layer
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Build System
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------------
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+ support for the FIT IoT-LAB testbed by direct integration into the Make build
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system
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+ integrated Docker support
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+ integration of llvm's clang static analyzer
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+ added target for the address sanitizer
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+ indicating possible feature conflicts at compile time
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+ unified OpenOCD script
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Changes
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=======
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Core
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----
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* improved documentation
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* fixed several IPC message queue initializations
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- removed hwtimer
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Drivers
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-------
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* optimized/remodeled GPIO interface
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* optimized/remodeled TIMER interface
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- temporarily removed CC2420 driver (awaiting last bug fixes for a rewrite)
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* re-implementation of the CC110x driver against the peripheral interface
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Network Stack
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-------------
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* temporarily removed and currently being refactored:
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- TCP support
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- CCN-lite
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- AODVv2
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System libraries
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----------------
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* new high level UART/stdio interface
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* better modularisation of POSIX wrapper modules
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- removed skipjack crypto library
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Packages
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--------
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* updated CMSIS HAL to version 4.3
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Other
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-----
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* clean-up of deprecated system and network libraries
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* clean-up of deprecated boards and drivers
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Selected Issues Fixed since the Last Release
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============================================
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#21: Deal with stdin in bordermultiplex.c
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A completely new border router implementation is in place
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#715: test_hwtimer_wait fails on native
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Fixed by @benoit-canet in #2870
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#861: neighbor discovery for 6LoWPAN not working
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GNRC implements 6LoWPAN ND in a RFC6775 compliant way
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#1753: vtimer_msg test crashes after ~49'20" and
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#1449: a removed vtimer might still get called back by hwtimer
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vtimer has been replaced by xtimer which does not have these issues
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#1870: IPv6 neighbor advertisements are malformed
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According to Wireshark (and reference implementations) GNRC sends
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well-formed neighbor advertisements
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#1964 and #1955: eventual problems with IoT-LAB M3 nodes in the testbed
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Solved by new driver versions for UART and radio
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#2228: samd21 stack sizes are too small
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The stacksize has been adapted in #2229
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Known Issues
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============
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network related issues
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----------------------
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#3075: nhdp: unnecessary microsecond precision
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NHDP works with timer values of microsecond precision which is not
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required. Changing to lower precision would save some memory.
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#3086: Max. packet length for AT86RF2XX
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The size of the link-layer header is not dynamically calculated, but
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instead the maximum# size is always assumed.
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#3201: Odd length packet snips cause invalid check sum
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If an odd length packet snip occurs in a packet and is not the last snip
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(in the order the packet is supposed to be, not in the list's order) in a
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packet it will generate a wrong check sum.
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#4048: potential racey memory leak
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According to the packet buffer stats, flood-pinging a multicast destination
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may lead to a memory leak due to a race condition. However, it seems to be
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a rare case and a completely filled up packet buffer was not observed.
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native related issues
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---------------------
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#495: native not float safe
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When the FPU is used when an asynchronous context switch occurs, either the
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stack gets corrupted or a floating point exception occurs.
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#499: native is segfaulting on heavy network usage
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Sending more than 100 packets per second causes a SEGFAULT in RIOT native.
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#534: native debugging on osx fails
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Using valgrind or gdb with a nativenet target in OSX leads to "the network"
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being stuck (gdb) or the whole process being stuck (valgrind).
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#3341 and #3824: nativenet crashes when hammered
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Flood-pinging a native instance from more than one host (either multiple
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threads on the host system or multiple other native instances), leads to a
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SEGFAULT.
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other platform related issues
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-----------------------------
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#2724: Add support for serial number passing to CMSIS boards, document it
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Documentation about how to discover and set the serial number of CMSIS-DAP
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chips is missing
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other issues
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------------
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#2761: core: define default flags
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If a thread is created without the corresponding flag (CREATE_STACKTEST),
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the ps command will yield wrong numbers for the stack usage
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#2927: core: Automatically select the lowest possible LPM mode
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Not all available low power modes (LPMs) are implemented for each platform
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and the concept of how the LPM is chosen need some reconsideration
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#2967: Makefile.features: location is not relevant for all features
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Provided features for the build system should be split up into a board and
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cpu specific part
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#3109: periph/random: random_read should return unsigned int
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The documentation of this function does not match corresponding
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implementation.
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Special Thanks
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--------------------
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We like to give our special thanks to all the companies that provided us with
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their hardware for porting and testing, namely the people from (in alphabetical
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order): Atmel, Freescale, Limifrog, Phytec, SiLabs, and Zolertia; and also
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companies that directly sponsored development time: Cisco Systems, Eistec,
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Ell-i, FreshTemp LLC, and Phytec.
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More information
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================
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http://www.riot-os.org
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Mailing lists
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-------------
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* RIOT OS kernel developers list
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* devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
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* RIOT OS users list
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* users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
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* RIOT commits
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* commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
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* Github notifications
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* notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)
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IRC
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-----
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* Join the RIOT IRC channel at: irc.freenode.net, #riot-os
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License
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=======
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* Most of the code developed by the RIOT community is licensed under the GNU
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Lesser General Public License (LGPL) version 2.1 as published by the Free
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Software Foundation.
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* Some external sources are published under a separate, LGPL compatible license
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(e.g. some files developed by SICS).
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All code files contain licensing information.
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RIOT-2014.12 - Release Notes
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============================
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RIOT is a real-time multi-threading operating system that supports a range of
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