Tags: deus778/RIOT
Tags
RELEASE 2021.04
RIOT-2021.04 - 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 2021.04 release includes:
- netstats can now collect L1/L2 per neighbor statistics
- sock DTLS now allows using multiple credentials
- congure - a framework for implementing congestion control algorithms
- xfa (cross file arrays) - a mechanism to more easily define stuff across
files (e.g., shell commands)
- nimble is now using low-power ztimer
- nrf5x now properly configures external HF clock, power use down 411µA -> 3.6µA
for examples/minimal on nrf52dk
- many more modules and drivers have Kconfig support
- the semtech-loramac package now supports sx126x/llcc68 radios
- 8 new boards, 6 new drivers, 8 packages upgraded
We've also mostly finished our migration from mailing lists to forum.riot-os.org.
375 pull requests, composed of 992 commits, have been merged since the
last release, and 16 issues have been solved. 56 people contributed with
code in 103 days. 2564 files have been touched with 191220 (+) insertions and
91400 deletions (-).
Notations used below:
=====================
+ means new feature/item
* means modified feature/item
- means removed feature/item
New features and changes
========================
Core
----
+ clist: added clist_is_empty()
+ xfa: initial support for XFA's (cross file arrays)
System Libraries
----------------
* shell: allow defining shell commands using XFA
+ dbgpin: module for debugging and profiling
+ ztimer: add ztimer_is_set()
+ ztimer: add ZTIMER_SEC
+ ztimer: add periph_ptp backend
Networking
----------
* cord: Discovery patch altered to reflect changes in the underlying Resource Directory draft
* lwip: hook up sam0_eth support
+ congure: framework to implement congestion control and use it in a reusable manner with
a number of protocols
+ netstats: L1/L2 per neighbor statistics
+ sock DTLS: allow using multiple credentials
Packages
--------
* emlearn: bump version to 0.11.6
* libfixmath: bump version to latest master
* nanocbor: bump version
* nanopb: bump version to 0.4.5
* fatfs: bump version to r0.14a
* littlefs2: Bump to v2.4
* monocypher: bump to version 3.1.2
* nimble: migrate to ztimer, allowing low power operation
* openthread: bump version to 20191113
* wakaama: add patch to cast macro to time_t
* pkg/semtech-loramac: switch to RIOT AES
* pkg/semtech-loramac: refactor to use netdev API only
* pkg/lwip: Start DHCP early for all Ethernet interfaces
Boards
------
* particle-mesh boards: Use USB serial as stdio by default
* nucleo-f303re: I2C pins remapped to match the data sheet
* nucleo-f722ze: Add periph_can support
* native: compile with `-Og` (was `-O0`)
+ boards/nucleo-f767zi: Add periph_can support
+ New boards:
+ atmega328p-xplained-mini
+ atxmega-a1u-xpro
+ atxmega-a3bu-xplained
+ BastWAN
+ Microbit v2
+ samd20-xpro
+ TI CC1350 LAUNCHXL
+ Zigduino
CPU
---
+ Initial support for ATxmega family of 8-bit AVR CPUs
+ kinetis: enable floating point support
* nrf5x: enhance enabling of internal DC/DC converter
* nrf52: add VDDHDIV5 as ADC input
+ nrf52: add periph_uart_non_blocking support
+ native: add periph/flashpage implementation
+ qn908x: Implement blocking SPI support
+ qn908x: add ADC support
+ sam0_common: add rtc_get_tamper_event()
+ stm32f{2,4,7}: Initial flashpage support
+ stm32f7: added ADC support
* stm32/can: add option to enable deep-sleep per device
Device Drivers
--------------
+ new drivers:
+ sensirion SGP30 gas sensor
+ Amphenol sm-pwm-01c dust sensor
+ Si705x sensors
+ TI BQ2429x charger and power management ICs
+ Netdev driver for nrf24l01p
+ sx126x/llcc68 LoRa radios
* touch_dev & display_dev auto-initialization
* bmx280: increase accuracy of SAUL pressure readings
* lis2dh12: functionality extension
* cc110x: add hook cc1xxx_eui_get()
* ds3231: add alarm support
* at86rf2xx: add missing handler for TRX24_RX_START interrupt
* periph_rtt: add periph_rtt_set_counter feature
Documentation
-------------
+ riotboot and its USB DFU version were added to the documentation
+ cpu/cc26xx_cc13xx: add CPU documentation
* doc/SAUL: State expectations on blocking and interrupts
* sys/phydat: clarify use of phydat::scale in phydat_fit
* sys/ztimer: clarify doc on clock ops
* doc/Coding_Convention: clarify: void return is allowed
* sys/event: add missing precondition to doc
Build System / Tooling
----------------------
* RIOT now defaults to C11
* RIOT now compiles with `-fwrapv`
+ compile_commands.json files can be produced, easing IDE integration
* riotboot USB DFU: Enter bootloader when board's bootloader button is pressed on power-up
* Make: enable SECONDEXPANSION globally
Testing
-------
+ Test utilities result output (turo) module for testing logic abstraction
+ Github integration of static tests using annotations completed
Kconfig
-------
+ Modules with dependency model added:
+ drivers/{l, m, n, o, p, q, r, s, t, u, v, w}*
+ pkg/c25519
+ pkg/cayenne-lpp
+ pkg/cifra
+ pkg/cn-cbor
+ pkg/driver_atwinc15x0
+ pkg/driver_bme680
+ pkg/emlearn
+ pkg/gemmlowp
+ pkg/hacl
+ pkg/heatshrink
+ pkg/jsmn
+ pkg/libb2
+ pkg/libcose
+ pkg/libfixmath
+ pkg/libhydrogen
+ pkg/lora-serialization
+ pkg/micro-ecc
+ pkg/microcoap
+ pkg/minmea
+ pkg/monocypher
+ pkg/nanocbor
+ pkg/nanopb
+ pkg/qDSA
+ pkg/qcbor
+ pkg/relic
+ pkg/talking_leds
+ pkg/tiny-asn1
+ pkg/tinycbor
+ pkg/tinycrypt
+ pkg/tlsf
+ pkg/tweetnacl
+ pkg/u8g2
+ pkg/ubasic
+ pkg/ucglib
+ pkg/umorse
+ pkg/utensor
+ pkg/yxml
+ sys/{crypto, hashes, random}
+ sys/analog_util
+ sys/app_metadata
+ sys/base64
+ sys/bitfield
+ sys/bloom
+ sys/cb_mux
+ sys/eepreg
+ sys/matstat
+ sys/memarray
+ sys/mineplex
+ sys/oneway
+ sys/posix_{sleep, inet}
+ sys/sema
+ sys/seq
+ sys/uri_parser
+ sys/timex
+ sys/ztimer
+ Modules with configurations exposed:
+ cpu/stm32f2f4f7: clock configuration
+ net/lorawan
+ sys/shell
+ Source EXTERNAL_MODULES configurations
Examples
--------
* examples/suit_update: update to aiocoap 0.4.1
* examples/dtls-sock: add multiple credentials
* examples/gnrc_border_router: enable ethernet uplink
API Changes
-----------
* mtd: rename mtd_write_page() -> mtd_write_page_raw(), add high-level mtd_write_page()
* sys/ztimer: rename required_pm_mode to block_pm_mode
* sock/async: add function to retrieve session object of current DTLS event
* sys/net/netopt: make NETOPT_TX_END_IRQ and friends read-only
Deprecations
============
Deprecations
------------
- core/lifo: will be removed in 2021.07
Removals
--------
- Remove deprecated features:
- flashrom API (was deprecated since 2017, use periph/flashpage)
- boards: remove AVRDUDE_PORT and PORT_BSL
Known issues
============
Networking related issues (48)
------------------------------
USB cdc-ecm on nrf52
packet buffer
address
assertion or completely without error
chars
address
Timer related issues (15)
-------------------------
time.
_xtimer_now() and irq_disable()
Drivers related issues (15)
---------------------------
timeout
clock cycles
supported
Native related issues (5)
-------------------------
Other platforms related issues (18)
-----------------------------------
__WFI()
(not previous)
CS
Build system related issues (14)
--------------------------------
evaluation
image
value
Other issues (57)
-----------------
on stm32wb
ports
LLVM
depending on code layout in flash
esp32-wroom-32
shell after flashing with J-Link
10
static_asserts in the same scope
everywhere
There are 172 known issues in this release
Fixed Issues since the last release (2021.01)
=============================================
16 fixed issues since last release (2021.01)
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
IRC, Matrix and Forum
=====================
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os
* Join the RIOT Matrix room at: #riot-os:matrix.org
* Join the RIOT Forum at: forum.riot-os.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.
Merge pull request RIOT-OS#16452 from miri64/backport/2021.04/gnrc_ip… …v6_nib/fix/acquire-race gnrc_ipv6_nib: fix acquire race on gnrc_ipv6_nib_get_next_hop_l2addr() [backport 2021.04]
Merge pull request RIOT-OS#16408 from benpicco/backport/2021.04/pkg/n… …anopb-0.4.5 pkg/nanopb: bump version to 0.4.5 [backport 2021.04]
Merge pull request RIOT-OS#16380 from miri64/backport/2021.04/gh-acti… …ons/fix/remove-linters gh-actions: release-tests: do not run linters for release tests [backport 2021.04]
Merge pull request RIOT-OS#16329 from miri64/tests/fix/periph_rtt_min… …-timeout tests/periph_rtt_min: adapt for slower RTTs
RELEASE 2021.01
RIOT-2021.01 - 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 2021.01 release includes:
- Device Firmware Upgrade support for USBUS
- USB HID minimal implementation
- IEEE 802.15.4 security initial implementation
- 6LowPAN Minimal Forwarding and Selective Fragment Recovery initial
implementation
- Initial support for QN808x, SAMD10 STM32MP1 and STM32L5 CPUs
- Initial support for Cortex-M33
- A module for selecting entropy sources
- Initial support for the Decawave Impulse Radio-Ultra Wideband (UWB Core)
- Capability to join or leave link layer multicast groups (GNRC)
- Support for IN865 region in GNRC LoRaWAN
- 83 additional modules supported by Kconfig
- 14 new boards, 6 new device drivers, 8 packages updated
In order to improve community interaction, during this release cycle we started
to migrate from a mailing-list-based communication to forum-based
communication. We are proud to present the RIOT-OS forum available at
forum.riot-os.org
533 pull requests, composed of 1440 commits, have been merged since the
last release, and 65 issues have been solved. 58 people contributed with
code in 119 days. 3852 files have been touched with 348619 (+) insertions and
52516 deletions (-).
Notations used below:
=====================
+ means new feature/item
* means modified feature/item
- means removed feature/item
New features and changes
========================
Core
----
+ msg_bus: allow to differ between messages form bus and from thread
+ mutex: Add mutex_cancel
+ mbox: add mbox_size(), mbox_avail()
* refactor thread info
- remove kernel_types.h
System Libraries
----------------
+ Add thread-safe Malloc
+ sys/tsrb: Make thread-safe
+ mtd_mapper: implement pagewise functions
+ xtimer: introduce xtimer_msleep()
+ usbus: Add USB peripheral serial string support
+ hashes: Add PBKDF2-sha256 implementation
+ usbus/dfu: add Device Firmware Upgrade support for USBUS
+ USB HID minimal implementation
+ Add helpers for pointer tagging
+ atomic_utils: Functions for atomic access
+ entropy_source: add new module for entropy sources
+ nimble_autoadv: add new module
* ztimer:
+ add ztimer_mutex_lock_timeout()
* fix xtimer_compat
* increase xtimer_compat coverage
* oneway-malloc: check calloc args
* event: Allow single event_thread handling all queues
- irq_handler: Drop module
Networking
----------
+ gnrc_netif: add capability to join or leave link layer multicast groups
+ gnrc_sixlowpan_frag:
+ initial import of Minimal Forwarding according to RFC 8930
+ initial import of Selective Fragment Recovery (RFC 8931)
+ gnrc_netif_ethernet: Support RX timestamp
+ Initial implementation of IEEE 802.15.4 security
+ sock: add access to auxiliary data
* gnrc_pkt: refactor to not use utlist.h
* sys/net/gnrc: fix in-band signaling of no RSSI
* gnrc_netif_pktq: fix pktbuf leak
* Fixed a critical bug, allowing to crash the whole system with a specially
crafted LoRa frame
* GNRC LoRaWAN:
+ Support for IN865 region, Improve debugging
* GNRC LoRaWAN: Bug fix for zero CFList
* IEEE 802154 Radio HAL:
+ add `read` function
+ add IEEE802154_RADIO_INDICATION_CRC_ERROR
+ add IEEE802154_RADIO_INDICATION_TX_START
+ add helpers for RSSI and dBm conversion
* fix wrong rssi conversions treewide
* IEEE 802.15.4 SubMAC:
+ add retransmission reporting
* enable ACK_REQ by default
* unify legacy and radio HAL bootstrap
* gcoap:
+ Process CON responses
* make blocksize configurable
- Remove deprecated features
- gcoap: remove deprecated gcoap_add_qstring
- gnrc_nettype: remove GNRC_NETTYPE_IOVEC
- gnrc_pktbuf: drop gnrc_pktbuf_replace_snip()
- gnrc_sixlowpan_rb: remove GNRC_SIXLOWPAN_FRAG_RBUF_AGGRESSIVE_OVERRIDE
- sock/dtls: remove sock_dtls_session_create due to deprecation
Packages
--------
+ openthread: add support for radios compatible with SubMAC
+ uwb_core: initial support
* Updates:
* littlefs2: Bump to v2.3
* jsmn: bump version
* libb2: update to latest release
* libhydrogen: bump version
* micro-ecc: bump version
* tinycrypt: bump version
* fatfs: bump version to r0.14
* gecko_sdk: update to v2.7.7
* hacl: switch upstream to backup copy
* lvgl: bump to v7.7.1
* openwsn:
+ add ieee802154_hal based radio
+ openwsn: add sock_udp
- nordic-softdevice: remove deprecated package
Boards
------
* Renode:
+ stm32f4discovery: Add initial renode support
+ firefly: add renode configuration
+ hifive*: add renode support
* Arduino feature:
+ waspmote-pro: add arduino feature
+ remote-revb: add arduino feature
+ New boards:
+ ESP32-Ethernet-Kit
+ arduino-nano-33-iot
+ weact-f401cc / weact-f401ce / weact-f411ce
+ e104-bt5011a-tb
+ e180-zg120b-tb
+ feather-m0-lora
+ nrf52840-mdk-dongle
+ nucleo-l011k4
+ nucleo-l552ze-q
+ frdm-kl43z
+ slstk3400a
+ stk3200
+ SAM D10 Xplained Mini
+ Particle boards: Support monofirmware builds and uploads
+ saul_pwm: auto-init'able RGB LEDs and dimmers for:
* particle-argon / particle-boron / particle-xenon
* nrf52840-mdk-dongle
* nrf52840dongle
+ native: allow to use ZEP instead of tap
+ ikea-tradfri: add SPI NOR Flash configuration
CPU
---
+ Cortex-M33: add initial support
+ nrf5x: implement periph_timer_periodic
+ nrf52: Add i2c reconfigure feature
+ SAMD10: Add support
+ stm32l5: add initial support
+ stm32mp1: Add initial support
+ QN908x: Add initial support
* atmega_common: Split into atmega_common and avr8_common
* Improve clock configuration
* stm32:
* rtc: add unlock/lock to rtc_clear_alarm
* uart: set flow control bits before enabling uart
* cpu/stm32: enable overdrive mode on f4 and f7 for high clock speeds
* cpu/stm32: Fix & cleanup periph_eth
* esp:
+ implement ESP WiFi SoftAP mode
* Fix cast alignment issues
* sam3/periph_timer: fix trigger of cleared timer
* native:
+ rtc: add rtc_set_time implementation
* fix memory leak
- remove unused can_linux module
* cc2538:
+ add riotboot feature
+ add flashpage & flashpage_raw
+ add periph_uart_nonblocking
* efm32:
+ add coretemp driver
+ add watchdog peripheral
* sam0_common:
+ cpu/sam0: add initial ethernet support
+ flashpage: add functions to write to user config area / AUX page
* flashpage: rename to sam0_flashpage_aux_write()
+ SPI: add support for QSPI in SPI mode
Device Drivers
--------------
+ Add utilities for Ethernet Media-Independent Interface (MII) and use them in
STM32 `periph_eth`
+ cst816s: Initial include of cst816s touch screen driver
+ gp2y10xx dust sensor
+ DS3231 RTC
+ periph_common: dac: add dac_play()
+ scd30: Add reset function to Sensirion scd30 sensor
+ si1133: New SI1133 UV/IR/Ambient light driver
+ sc: Add driver for Honeywell HSC series pressure and temperature sensor
+ ndev: add mcp2515 + driver/mcp2515: add driver
+ net: Add netdev_driver_t::confirm_send
+ PTP Clock
* cpu/stm32:
* periph_eth: Use auto-negotiation
* Fix periph_eth link status
* Fix reception bug in periph_eth
* nrf802154:
* change internal state to idle after rx
* fix set_cca_threshold range
* fix unwanted emissions at the end of ACK frame
* fix state transition and `off` function
* nrf802154: default to netdev_ieee802154_submac
* cc2538_rf:
* fix transmit function
* default to netdev_ieee802154_submac
* at86rf2xx: fix null pointer check
* at86rf215:
+ add functions to configure trim & clock output at run-time
+ implement battery monitor, add power bus
+ implement MR-FSK
* make use of packet queue if available
* fix dependency resolution for 2.4 GHz
* w5100.c: correct the pointer position when w5100's buf is full
* srf04: fix overflow on AVR
* periph/rtt: fix overflow in tick conversion macros
* mtd_flashpage: fix erasure of multiple sectors
* mtd_spi_nor: cleanup & bug fixes
Documentation
-------------
+ README: Add merge-chance badge
+ riotboot: add basic porting guide
+ emulators: add emulators documentation in Doxygen
+ SECURITY.md: Add initial security policy
* generate-changelog: add support for point releases
* add Docker info to doxygen
* drivers/netdev: Clarify documentation
* README.md: move tapsetup section to documentation
* native: Improve Documentation
* CONTRIBUTING: cleanup and reorganize
* core/msg_bus: enhance documentation
* cpu/stm32: rewrite clock configuration documentation
* doc: advertise forum.riot-os.org
* doc: Give examples of what DEVELHELP does
* gnrc/rpl: document implementation status
* ieee802154/radio: indicate that FCS is ignored when reading buffer
* uhcp: improve documentation
* update board porting documentation page
Build System / Tooling
----------------------
+ testbed-support: add iotlab mapping for dwm1001
+ info.inc.mk: Add info-build-json as JSON-formatted build info
+ makefiles/utils: add util to compare to software versions
+ emulator: add debug feature with qemu emulator
* Makefile.include: avoid recursive expansion of USEMODULE
+ makefiles/pseudomodules.inc.mk: netdev_ieee802154_legacy is a pseudomodule
* dist/tools/bmp: Fix flashing with pygdbmi 0.10.0
* drivers/at86rf215: fix dependency resolution for single radio
* cpu/esp*: fix linker scripts
* info-objsize: Restore info-objsize target
* make: run static_tests.sh directly with `static-tests` target
* picolibc: model as a feature
* tools/esptool: add common makefile to define esptool variables
* dist/tools: Use bash instead of sh where needed
* tools/emulator: allow use with *term targets + introduce EMULATE=1 instead of emulate target
* mips: adapt for toolchain update (2020.06-01)
- remove the bootloader_% pseudo-feature, replace it with highlevel_stdio
Continuous Integration
----------------------
* use Github actions for static tests instead of Travis
+ Add support for Github annotations.
* gh-actions/release-test: bump ssh-agent to v0.4.1
Testing
-------
+ tests/mpu_stack_guard: add automatic test script
+ tests/mtd_raw: add simple test for MTD
* treewide: cleanup ENABLE_DEBUG
* release-tests: fix artifact naming and steps cleanup for matrix build
* tests/sys_atomic_utils_unittests: spice up test
* tests/unittests: split out atomic_utils unittests
* sys/shell: terminate shell on Ctrl-D
Kconfig
-------
+ Modules with support added:
+ drivers/{a, b, c, d, e, f, g, h, i, j}*
+ drivers/ili9341
+ test/periph_*
+ cpu/stm32: add script to generate Kconfig.models and Kconfig.lines files
+ add modules to test on native
+ Clock configuration for:
+ stm32l4
+ stm32l5
+ stm32wb
+ stm32f0
+ stm32g0g4
+ stm32l0l1
+ stm32f1f3
* drivers/rn2xx3 : Kconfig updates.
* MQTT-SN Clients: Kconfig Updates
Examples
--------
+ gnrc_networking: add option to enable DNS
* gnrc_border_route: simplify ZEP setup on native
* suit_update: use interactive sync in test
* gcoap: Allow PUT/POST with empty payload
* suit_update: update IETF draft reference in the README
API Changes
===========
* periph_flashpage: Make pagewise API optional
* net/eui_provider: API cleanup
* sock/dtls: add getter/setter for the remote UDP endpoint of sock_dtls_session_t
* drivers/pn532: use pseudomodules to select i2c or spi
* GNRC: fix in-band signaling of no RSSI
Deprecations
============
Removals
--------
- Remove deprecated features:
- gnrc_nettype: remove GNRC_NETTYPE_IOVEC
- gnrc_sixlowpan_rb: remove GNRC_SIXLOWPAN_FRAG_RBUF_AGGRESSIVE_OVERRIDE
- pkg/nordic-softdevice: remove deprecated package
- boards/native: remove all-debug deprecated target
- gnrc_pktbuf: drop gnrc_pktbuf_replace_snip()
- sys/irq_handler: Drop module
- sock/dtls: remove sock_dtls_session_create due to deprecation
- gcoap: remove deprecated gcoap_add_qstring
- pkg/tinydtls: remove deprecation message about some CFLAGS
Known issues
============
Networking related issues (43)
------------------------------
packet buffer
address
assertion or completely without error
chars
address
Timer related issues (16)
-------------------------
time.
_xtimer_now() and irq_disable()
Drivers related issues (14)
---------------------------
timeout
clock cycles
supported
Native related issues (5)
-------------------------
Other platforms related issues (19)
-----------------------------------
__WFI()
(not previous)
CS
Build system related issues (14)
--------------------------------
evaluation
image
value
Other issues (41)
-----------------
ports
LLVM
depending on code layout in flash
esp32-wroom-32
shell after flashing with J-Link
10
static_asserts in the same scope
everywhere
There are 152 known issues in this release
Fixed Issues since the last release (2020.10)
=============================================
msg_try_send()
session has been finished
20 fixed issues since last release (2020.10)
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
-------------
* RIOT OS kernel developers list
devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
* RIOT OS users list
users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
* RIOT commits
commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
* Github notifications
notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)
IRC, Matrix and Forum
------------
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os
* Join the RIOT Matrix room at: #riot-os:matrix.org
* Join the RIOT Forum at: forum.riot-os.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.
Merge pull request RIOT-OS#15905 from benpicco/backport/2021.01/pr/st… …m32-fix-exti cpu/stm32/gpio: fix EXTI flag clearing [backport 2021.01]
Merge pull request RIOT-OS#15876 from fjmolinas/backport/2021.01/pr_f… …ix_posix_sleep tests/posix_sleep: fix for invalid RTT configurations [backport 2021.01]
Merge pull request RIOT-OS#15864 from leandrolanzieri/backport/2021.0… …1/pr/makefile/fix_default_modules_in_usemodules Makefile.include: avoid recursive expansion of USEMODULE [backport 2021.01]
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