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@bergzand bergzand released this 30 Oct 17:22
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RIOT-2020.10 - Release Notes

RIOT is a multi-threading operating system which enables soft real-time
capabilities and comes with support for a range of devices that are typically
found in the Internet of Things: 8-bit and 16-bit microcontrollers as well as
light-weight 32-bit processors.

RIOT is based on the following design principles: energy-efficiency, soft
real-time capabilities, small memory footprint, modularity, and uniform API
access, independent of the underlying hardware (with partial POSIX compliance).

RIOT is developed by an international open-source community which is
independent of specific vendors (e.g. similarly to the Linux community) and is
licensed with a non-viral copyleft license (LGPLv2.1), which allows indirect
business models around the free open-source software platform provided by RIOT.

About this release:

The 2020.10 release includes:

  • Support for PicoLIBC as standard C library implementation
  • A new radio abstraction layer for ieee802.15.4 radios
  • Improvement to the linking of modules
  • An improved algorithm for generating local unique identifiers
  • Pagewise addressing support for MTD devices
  • 23 additional modules supported by Kconfig
  • Initial rework of the clock modelling on stm32 devices
  • 5 new boards, 2 new device drivers, 7 packages updated

482 pull requests, composed of 1355 commits, have been merged since the
last release, and 84 issues have been solved. 64 people contributed with
code in 94 days. 2426 files have been touched with 133358 (+) insertions and
756906 deletions (-).

Notations used below:

+ means new feature/item
* means modified feature/item
- means removed feature/item

New features and changes

Core

  • init: make boot message configurable
  • panic: callback app during panic
  • bitarithm: add bitarithm_test_and_clear()
  • thread: Add THREAD_NAMES make flag
  • kernel_defines.h: Fix container_of()
  • core: Add and use helper functions for internal data
  • treewide: Fix direct access to scheduler internals
  • core/bitarithm: use __builtin_clz() for bitarithm_msb()

System Libraries

  • architecture: New module to access architecture internals
  • Add support for PicoLIBC
  • ztimer: add ztimer_spin()
  • ztimer: add periodic timers API
  • byteorder:
    • Moved to sys
    • Add byteorder_bebuftohll() and inverse
    • add uint32 from/to buffer funcs
  • event: implement waiting on multiple queues
  • evtimer: add mbox support
  • random: add SHA256 mode to SHA1PRNG & tests
  • sys/luid: improve luid_base() algorithm
  • tsrb: Make thread-safe
  • pipe_dynamic: fix possible null pointer dereference

Networking

  • ieee802154_submac: add initial support for common MAC sub layer
  • ieee802154/radio_hal: introduce Radio HAL for IEEE802.15.4 compatible radios
  • EUI:
    • luid: add luid_netdev_get_eui48() & luid_netdev_get_eui64()
    • eui64: add eui64_to_eui48()
  • link_layer: implement EUI provider
  • luid: shuffle bytes
  • uhcp: use LOG_xxx functions
  • gcoap: Insert registrations at the front
  • gnrc_ipv6_nib: only multicast probe UNREACHABLE neighbor if 6LR
  • gnrc_ipv6_nib: set NCE stale on incoming ARO
  • gnrc_ipv6_nib: don't add non-link-local to NC without ARSM
  • gnrc_netif_pktq: add packets to optional send queue when device is busy
  • emcute: fix buffer overflow in _willupd_msg()
  • SUIT:
    • Introduction of a payload storage API for SUIT manifest payloads
    • Upgrade to draft-ietf-suit-manifest-09
    • fail fetch if the image size doesn't match expected
  • gnrc:
    • Remove cyclic dependencies
    • Remove deprecated module gnrc_nettest
  • netopt: remove deprecated alias NETOPT_LINK_CONNECTED

Packages

  • openwsn: add riot based openwsn scheduler
  • openwsn: add shell commands
  • openthread: migrate to event loop
  • nimble/netif: fix deadlock on connection loss
  • wolfssl: bump version to 4.5.0
  • nanopb: bump version to 0.4.3
  • ccn-lite: bump version
  • cn-cbor bump to 1.0.0
  • tinycbor: bump to v0.5.3
  • tinydtls: enforce the selection of a crypto secure PRNG
  • jerryscript: bump to version 2.3.0
  • semtech-loramac: replace xtimer by ztimer
  • lvgl:
    • add logic for managing touch devices
    • introduce screen_dev wrapper
    • bump to v7
  • emb6: remove deprecated package

Boards

  • nrf52: Enable PWM on the LED pins
  • nucleo-g071rb: add initial support
  • nucleo-g070rb: add board
  • nucleo-g431rb: add initial support
  • Support for YARM board
  • add Adafruit Itsy Bitsy
  • samr21-xpro: fix reading EUI-64 from EDBG on cold boot
  • nucleo-l452re: add i2c config
  • hifive1b: add support for openocd programmer
  • remove support for wsn430-1_3b and wsn430-1_4

CPU

  • cortexm:
    • Make no_thread_idle compatible with cortex-m0
    • Add thread info to hard fault handler
    • advertise puf_sram feature
    • Skip context save/restore on scheduling the previous thread
    • use mpu stack guard if DEVELHELP is enabled
    • fix check for bitbanding
    • Flush pipeline after triggering PendSV
  • cc2538: add Watchdog implementation
  • cc26xx_cc13xx:
    • add & link CCFG configuration
    • enable periph clocks on sleep
  • fe310:
    • Add custom PLIC driver as peripheral
    • Merge and optimize trap_entry with irq_arch
    • Unify linker scripts
  • msp430: Update to inline-able IRQ API Area
  • nrf5x_common: UART: add support for 1 MBaud
  • stm32:
    • generate vectors C files and IRQ defines from CMSIS headers
    • stm32cmsis: retrieve STM32 CMSIS header from a package
    • g0: add basic support
    • implement periph_timer_periodic
    • Add support for arbitrary SPI clock rate
    • f0/f1/f3/l0/l1/l4/wb: rework clock initialization and configuration
    • disable MPU for cortex-m0+
  • sam0:
    • GPIO: use tamper detection to wake from Deep Sleep
    • add support to run PWM off TC timers
    • ADC: add support for samd5x/same5x
    • Add support for Single-cycle I/O Port for GPIO
    • UART: implement arithmetic BAUD mode
    • merge RTC & RTT implementation
    • flashpage: clean up implementation
  • saml1x: Remove MPU feature

Device Drivers

  • at86rf2xx: spi security module
  • at86rf2xx: support frame retry reporting on AT86RFR2
  • soft_uart: add software based UART implementation
  • scd30 : Add driver for scd30 sensor
  • stm32_eth: add 'NETDEV_EVENT_LINK_UP' event
  • Add support for Adafruit Seesaw Soil moisture sensor
  • radio_hal:
    • introduce Radio HAL for IEEE802.15.4 compatible radios
    • cc2538_rf: implement Radio HAL
    • nrf52840: implement Radio HAL
  • mtd: add page addressed operation
  • stmpe811: fix interrupt polarity & interrupt generation
  • sps30: Update units of measurement
  • sps30: Add sleep mode
  • sdcard_spi: remove auto-init

Build System / Tooling

  • Add libstdcpp feature
  • gnrc_border_router: Add USB Ethernet support
  • buspirate: add Bus Pirate as Debug Adapter
  • README: Add more badges
  • Convert remaining Python2 users to Python3
  • openocd-adapters: select transport based on adapter
  • Makefile.{base,include}: Fix linking for C++ code in external modules
  • link object files instead of archives
  • tapsetup:
    • Add support for listing bridges
    • Add support to configure addresses for bridge
    • Add support for configuring routes and forwarding capabilities for bridge
    • Add TUN support

Testing

  • vagrant: add Vagrantfile to test native in FreeBSD
  • compile_and_test_for_board.py: add optional JUnit XML support
  • bench_*: Add ticks per iteration results

Kconfig

  • Finished modelling provided features
  • Modules with support added:
    • credman
    • cord
    • nrf-based
    • ek-lm4f120xl
    • lpc1768-based
    • lpc2387-based
    • native
    • mips32r2-based
    • sam3-based
    • sam0_common
    • same54-xpro
    • saml1x-based
    • saml21-based
    • stm32
    • l2filter
    • dhcpv6
    • hifive1(b) clock area
    • stm32gx clock configuration
    • periph/timer
    • netif
    • skald
    • sock_dtls
    • lora
  • add genconfig script
  • enable incremental compilation on config changes
  • include KCONFIG_OUT_CONFIG unconditionally

API Changes

  • gcoap: remove gcoap_finish
  • gpio: IRQs triggered after gpio_irq_disable() are discarded
  • sched: Refactor to return the next scheduled thread
  • sock: Application should pull in the pseudomodules
  • driver-guide.md: Drivers are expected to return negative errno values
  • nrf52xxxdk: configure LEDs as PWM

Known issues

Networking related issues (42)

#14962: LoRaWan node ISR stack overflowed
#14689: dist/tools/sliptty/start_network.sh: IPv6 connectivity is broken on PC
#13997: ping6 is failing when testing with cc2538dk
#13745: ethos: Unable to choose global source address.
#13493: ethernet: Missing multicast addr assignment
#13280: nrf52: Not able to add global or ULA address to interface
#13088: Riot-os freezes with lwip + enc28j60 + stm32L4
#12943: driver/mrf24j40: blocks shell input with auto_init_gnrc_netif
#12884: examples/cord_ep: Dead lock when (re-)registering in callback function
#12857: examples/gnrc_networking_mac broken on ATmega
#12761: samr30 xpro doesn't seem to use its radio ok
#12642: Emcute cannot create a double-byte name
#12565: gnrc_icmpv6_echo: flood-pinging another node leads to leaks in own
packet buffer
#12264: ethos: Unable to handle fragmented IPv6 packets from Linux kernel
#12210: stale border router does not get replaced
#11988: ethos: fails to respond to first message.
#11860: send data with UDP at 10HZ, the program die
#11852: scan-build errors found during 2019.07 testing
#11405: nrfmin: communication not possible after multicast ping with no interval
#11033: 6lo: RIOT does not receive packets from Linux when short_addr is set
#10969: net: netdev_driver_t::send() doc unclear
#10861: cpu/esp8266: Tracking open problems of esp_wifi netdev driver
#10809: openthread: does not build on current Arch
#10410: Missing drop implementations in netdev_driver_t::recv
#10389: gnrc_sock_udp: Possible Race condition on copy in application buffer
#10380: netdev_ieee802154: Mismatch between radio ll address and in memory
address
#10370: gomach: Resetting netif with cli doesn't return
#10338: xbee: setting PAN ID sometimes fails
#8779: CC2538 RF overlapping PIN usage
#8752: mrf24j40: does not link for examples/default
#8271: app/netdev: application stops working after receiving frames with
assertion or completely without error
#8242: at86rf2xx: Dead lock when sending while receiving
#8199: gcoap example request on tap I/F fails with NIB issue
#7737: pkg: libcoap is partially broken and outdated
#7474: 6lo gnrc fragmentation expects driver to block on TX
#7304: General 802.15.4/CC2538 RF driver dislikes fast ACKs
#6018: nRF52: gnrc_6lowpan_ble: memory leak with nordic_softdevice_ble
#5863: OSX + SAMR21-xpro: shell cannot handle command inputs larger than 64
chars
#5486: at86rf2xx: lost interrupts
#5230: gnrc ipv6: multicast packets are not dispatched to the upper layers
#5051: Forwarding a packet back to its link layer source should not be allowed
#4527: gnrc_ipv6: Multicast is not forwarded if routing node listens to the
address

Timer related issues (15)

#13321: Sleep mode for Arduino
#13072: periph/timer: timer_set() underflow safety check (tracking issue)
#10545: periph_timer: systematic proportional error in timer_set
#10523: saml21 system time vs rtc
#10510: xtimer_set_msg: crash when using same message for 2 timers
#10073: xtimer_usleep wrong delay time
#9187: sys/newlib: gettimeofday() returns time since boot, not current wall
time.
#9052: misc issues with tests/trickle
#9049: xtimer mis-scaling with long sleep times
#8746: stm32_common/periph/rtc: current implementation broken/poor accuracy
#8251: MSP430: periph_timer clock config wrong
#7347: xtimer_usleep stuck for small values
#7114: xtimer: add's items to the wrong list if the timer overflows between
_xtimer_now() and irq_disable()
#6442: cpu/native: timer interrupt issue
#6052: tests: xtimer_drift gets stuck on native

Drivers related issues (14)

#15121: PWM: Single-phase initialization creates flicker
#14506: mdt_erase success, but vfs_format resets board (esp32-heltec-lora32-v2)
#14439: (almost solved) SPI SD-Card driver: SPI initialisation freeze until
timeout
#14424: adc is not a ADC-Driver but a analog pin abstraction
#13527: examples/dtls-wolfssl not working on pba-d-01-kw2x
#13444: Potential security and safety race conditions on attached devices
#13079: drivers/srf04: incorrect values on ATmega based platforms
#12445: driver/hts221: Temperature and Humidity readings incorrect
#12371: fail to send data to can bus
#12057: ESP32 + DHT + SAUL reading two endpoints causes freeze.
#12045: floats and doubles being used all over the place.
#11104: STM32: SPI clock not returning to idle state and generating additional
clock cycles
#9419: cpu/msp430: GPIO driver doesn't work properly
#4876: at86rf2xx: Simultaneous use of different transceiver types is not
supported

Native related issues (3)

#13501: SDL2 does not work due to missing getpid
#5796: native: tlsf: early malloc will lead to a crash
#495: native not float safe

Other platforms related issues (19)

#14822: MPU doesn't work on cortex-m0+
#14728: stm32f7: Large performance difference between stm32f746 and stm32f767
#14679: examples/gnrc_border_router: esp_wifi crashes on disconnect
#14572: tests/mpu_noexec_ram: fails on i-nucleo-lrwan1
#14410: MIPS: toolchain objcopy doesn't work and no .bin can be generated
#14237: esp32-wroom-32: tests/netstats_l2 failing sometimes
#14015: stm32152re: hardfault when DBGMCU_CR_DBG* bits are set and branch after
__WFI()
#13606: gcoap/esp8266: Stack overflow with gcoap example
#13390: Cannot use LLVM with Cortex-M boards
#13104: boards/hifive1: flashing issue
#13086: Failing tests on FE310 (Hifive1b)
#12763: [TRACKING] Fixes for automatic tests of ESP32 boards.
#12651: Failing tests on AVR (tested with atmega256rfr2-xpro)
#12168: pkg/libb2: blake2s doesn't work on AVR
#11885: arm7: printf() with float/double not working
#10258: Incorrect defaultPORT building for esp32-wroom-32 on macOS
#10122: Indeterministic hard fault in _mutex_lock(), with nRF52 SoftDevice
#10076: cpu/cortexm_common: irq_enable returns the current state of interrupts
(not previous)
#6567: periph/spi: Switching between CPOL=0,1 problems on Kinetis with software
CS

Build system related issues (14)

#15185: build: info-build doesn't work with boards without port set
#14504: BUILD_IN_DOCKER ignores USEMODULE
#14288: pkg/ccn-lite: unable to make -j -C examples/ccn-lite-relay
#14264: make: ccache leads to differing binaries
#13492: make -j flash broken on esp* (will always flash the previous binary)
#12771: dist/tools/cppcheck/cppchck.sh: errors when running with Cppcheck 1.89
#10850: Tracking: remove harmful use of export in make and immediate
evaluation
#9913: Build dependencies - processing order issues
#9742: buildtest uses wrong build directory
#9645: Different build behavior between murdock and riot/riotbuild:latest
image
#8913: make: use of immediate value of variables before they have their final
value
#8122: doxygen: riot.css modified by 'make doc'
#6120: Windows AVR Mega development makefile Error
#4053: macros: RIOT_FILE_RELATIVE printing wrong file name for headers

Other issues (41)

#15072: periph_timer: Test coverage & broken on STM32F767ZI
#15066: tests/pkg_libhydrogen: test fails on master for the samr21-xpro with
LLVM
#15006: Two bugs may lead to NULL dereference.
#14929: cpu/sam0: flashpage write / read cycle produces different results
depending on code layout in flash
#14635: File systems report names with leading slashes
#14578: tests/cpp11_*: failing on i-nucleo-lrwan1
#14576: riotboot/nrf52840dk: flashing slot1 with JLINK fails
#14568: tests/pkg_libfixmath_unittests: failing on multiple platforms
#14548: edbg: long lines flooded over serial become garbled
#14520: examples / tests: LoRa tests fail on platforms that don't support LoRa
#14390: gcoap: Suspected crosstalk between requests (possible NULL call)
#14315: DTLS examples cannot send message to localhost
#14167: Gcoap drops long packages instead of gracefully erring out
#13918: cpu/stm32f1: CPU hangs after wake-up from STOP power mode
#13541: Order of auto_init functions
#13345: sys/xtimer: segmentation fault: in function xtimer_msg_received_timeout
#13285: Bug: openocd 0.10.0-6 Ubuntu dies while debugging with -rtos auto
#13277: Y2038 tracking issue / strategy
#13133: tests/pkg_tensorflow-lite: tests randomly failing on nrf52dk and
esp32-wroom-32
#13120: tests: broken with stdio_rtt if auto_init is disabled
#13044: _NVIC_SystemReset stuck in infinite loop when calling pm_reboot through
shell after flashing with J-Link
#12897: Can't build relic with benchmarks or tests
#12889: CC2538DK board docs: broken links
#12732: tests: some tests don't work with newlib lock functions.
#12621: Potential race condition in compile_and_test_for_board.py
#12108: make term output is inconsistent between boards, ethos and native
#12105: [TRACKING] sys/shell refactoring.
#11243: sys/riotboot: documentation issues
#10751: Possible memset optimized out in crypto code
#10731: nanocoap: incomplete response to /.well-known/core request
#10639: sys/stdio_uart: dropped data when received at once
#10121: RIOT cannot compile with the latest version of macOS (10.14) and Xcode
10
#9371: assert: c99 static_assert macro doesn't function for multiple
static_asserts in the same scope
#7365: scheduler: priority inversion problem
#7220: sys/fmt: Missing tests for fmt_float, fmt_lpad
#6533: tests/lwip target board for python test is hardcoded to native
#5009: RIOT is saw-toothing in energy consumption (even when idling)
#4866: periph: GPIO drivers are not thread safe
#4488: Making the newlib thread-safe
#3256: make: Setting constants on compile time doesn't really set them
everywhere
#2346: Tracker: Reduce scope on unintended COMMON variables

There are 148 known issues in this release

Fixed Issues since the last release (2020.07)

#15256: Kconfig file/folder name collision on case-insensitive filesystem
#15255: Repository 'broken' on macOS due to case-insensitive names
#15171: Failed assertion when using gnrc_minimal with SLIP
#15137: ESP8266 does not respond
#15130: cpu/cc26xx_cc13xx: CPU gets stuck on sched_arch_idle
#15123: esp32: mtd tests failing on CI
#15118: make: target info-objsize broken
#15085: failing assert in core/msg.c:386 when ping6 on Nucleo-F767ZI
#15065: pkg_utensor: Hard fault with LLVM
#15060: ztimer tests fail on efm32
#15045: Some I2C devices are not working on iotlab-m3
#15041: 2020.07-branch bug:RIOT/cpu/stm32/include/vendor/stm32f103xe.h
#15023: gnrc: all iotlab-m3 nodes have identical short HW addresses
#15016: Possible memory leak in cpu/native/syscalls.c
#15015: Is there a buffer overflow bug in drivers/at86rf2xx/at86rf2xx_getset.c?
#14988: tests/mtd_flashpage is broken on iotlab-m3 and b-l072z-lrwan1
#14980: hifive1b: sys/ztimer/core.c:159 => *** RIOT kernel panic: FAILED
ASSERTION.
#14958: nucleo-f303k8 no longer work since PR #14892
#14957: Return value of gnrc* calls not checked for -1
#14939: puf_sram not used when included as a feature
#14773: Can't read SD cards filled with more then 4 GiB data
#14752: Return value of gnrc_netif_ipv6_addr_idx is not checked for negative
#14735: Global Address remains in state TNT[3] forever
#14667: Undefined behavior in pkg/semtech-loramac/contrib/
#14636: native: reboot exits instance with TAP interface
#14514: Uncrustify enforces deviation of coding convention
#14466: Linking C++
#14217: tests/periph_timer_periodic is failing
#14169: Gcoap does not handle separate responses
#13838: Global Address remains in state TNT[3] forever
#13496: cpu/stm32/eth, board/nucleo-f767z1: ethernet buffering issue (ping >1s)
after debug break
#13490: cpu/stm32/eth, board/nucleo-f767z1: ethernet initialisation fails
sometimes
#13267: Failing tests on MSP430 (z1)
#13204: xtimer problem with nucleo32 boards
#11390: gnrc networking crashes on nRF51dk
#9882: sys/tsrb is not thread safe
#9709: examples: failed assertion in dtls-echo example
#9656: gnrc/netif: various problems after resetting interface a second time
#9518: periph/i2c: tracking bugs and untested acks
#8408: pkg/fatfs: linker error when build tests/pkg_fatfs_vfs for msb430 based
boards
#6650: GPIO Port shift in cc2538 is inconsistent
#4954: chronos: compiling with -O0 breaks

42 fixed issues since last release (2020.07)

Acknowledgements

We would like to thank all companies that provided us with hardware for porting
and testing RIOT-OS. Further thanks go to companies and institutions that
directly sponsored development time. And finally, big thanks to all of you
contributing in so many different ways to make RIOT worthwhile!

More information

http://www.riot-os.org

Mailing lists

IRC & Matrix

  • Join the RIOT IRC channel at: irc.freenode.net, #riot-os
  • Join the RIOT Matrix room at: #riot-os:matrix.org

License

  • The code developed by the RIOT community is licensed under the GNU Lesser
    General Public License (LGPL) version 2.1 as published by the Free Software
    Foundation.
  • Some external sources and packages are published under a separate license.

All code files contain licensing information.

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