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rt-thread RT-Thread is an open source IoT Real-Time Operating System (RTOS). https://rt-thread.github.io/rt-thread/
© 2026 AnnounceHQ. All rights reserved.
New March 19, 2025
RT-Thread v5.2.0 released Change Log Since v5.1.0 Release
Kernel
include/rtatomic.h: set RT_USING_STDC_ATOMIC to first prioritysrc/clock.c: rt_tick setting arbitrary value function is added to support low-power wake-up tick compensationsrc/timer:
add all soft timer config (#9048)
Merge the functions of rt_timer_check and _soft_timer_check (#8884)
src/kservise:
Enhance support for backtrace service (#9037)
src:
add CPU/thread usage tracing config (#8947)
src/Kconfig: separate klibc Kconfig, format Kconfig, update src/Kconfig, add RT_USING_CI_ACTION
Remove redundant memset & unlock in smp
Add smp_ipi_call function to call other cpus to work Fix kconfig display copywriting error (#9750) Add RT_USING_SMP judgement inside smp_call.h (#9835)
Support rt_packed
Added rt_interrupt_context* family for nested interrupt handling
Suppress unused warnings when DEBUG disabled
Specification interrupt nested level variable declaration type
Enable "recycling thread" in smart mode to fix bug with thread hanged
Remove RT_USING_SCHED_THREAD_CTX for next release
smart: User space context optimization
Add kerrno.h, kstring.h and kstdio.h
driver: smp_call: add non-blocking IPI calling method
Fixup memory address reserved and translate in early
fix bug of thread exit without releasing mutex & add error check log
add memset zero for rt_thread_init support of lockless rt_completion，The new rt_completion implemented by lockless algorithm can improve timer resolution for up to ~12%, compare to sem IPC.(#8887) add rt_hw_cpu_id() wrapper API (#8894)
make RT_ASSERT independent of RT_USING_DEUBG
add rt_thread_close() fix the issue of abnormal memcheck and memtrace calls when using SLAB.(#8862)
Fixup UP irq_spinlock ,add cpu up,add Kconfig option
add rt_hw_interrupt_uninstall declare in rthw
upgrade RT-Thread version to v5.2.0 Add a check for the time slice parameter in the create thread function(#8807)
Add subsys init level to facilitate earlier clk initialization
Fixed the rt_exit_critical_safe function incorrectly using returns
SIGNAL node assignment failure should return an error
Components
drivers
virtio: fix virtio net rx error(#9170) sensor:
Add power detection type(#9410)
added sensor device lookup function
Synchronizing sensor_v1 changes
[sensor_v2] Repair an error occurs when sensor v2 probes a sensor device for the first time
fdt:
legacy fdt (#9062)
Add bootargs select in early(#9411)
fixup: add address reverse/translate for DMA/CPU's address
fixup: ofw_parse_object fail
fixup: DTS version header always v1.0
fixup: Increase append child node's ref_count
fixup: rt_ofw_foreach_node_by_compatible args
tty: serial:
skip configure of rt_serial on tty open (#9152)
Make serial_v2.c compatible with the DFS_V2 interface (#9153)
Add an exception exit mechanism to poll tx.
fix_serial_baudrate_set
fix compiler error in serial dm (#8927)
fix error in getting serial_tty settings (#8953)
init dm serial naming framework in a separate phase (#8971)
fix when open smart but using msh after run elf file the msh will down
Add bypass hook to direct processing char when uart irq coming (#9713)
Add bypass testcase in utest (#9713)
fixed a minor typo in the comments of dev_serial_v2.c
using serial name to name tty
introduce hook for tty,improve code quality.
fix: code format of serial.c and compile error in aarch64 context_gcc
fix posix tty, and add more baudrate (#8683)
i2c:
merge the software i2c driver(#9886)
adjust the timing for I2C initialization
add ofw support i2c
rtc:
Specifies the rtc synchronization function (#9804)
Update software and hardware rtc device naming as rtc (#9778)
Fix rtc alarm thread parameters issue
Make RTC alarm internal thread's attributes configurable
hwtimer:
Add a user control interface
core:
Added default values for CPUTIME_TIMER_FREQ in components/drivers/cputime/Kconfig.
DFS mount auto by kernel parameters (#8989)
Simple NUMA (Non-Uniform Memory Access) (#9000)
Support simple power domain API (#9005)
Add IDA init in runtime
check available in stub probe
Fix the issue where creating a device using rt_device_create fails when attempting to delete it using rt_device_destroy(#9379)
wlan:
Add get_info api for more new sta information (#9837)
Add ap_get_info api for more ap information (#9867)
fixed a duplicate issue with the wifi scan command
add the wlan join scan function
usb
refactor(drivers/usb):replace rtt usb stack with cherryusb (#8799)
cherryusb fix USBD_IRQHandler argument
update(cherryusb) to v1.4.3
common
Organize the Kconfig in components/drivers(#9054)
Replace spinlock static init by RT_DEFINE_SPINLOCK
led
Rename LED register/unregister
pin
Reset the value of PIN_NONE
spi
Fix potential abnormal operations.
Fixed the issue where spi configure would be executed twice (#9972)
Fixup device rename by chip_select
Make CS pin config fixed in system (#9977)
Unified software SPI configuration
dev_spi_flash_sfud: fix: set message.parent.next to NULL for qspi_read API
fix: set message.parent.next to NULL for rt_qspi_send_then_recv API and rt_qspi_send API
Fixed an issue that caused spi bus deadlock in the spi configuration
Add -RT_EBUSY return value for rt_spi_bus_configure and mutex protection
soft_spi_pin_init loop variable is initialized to 0
spi device driver framework adds pin init function function
thermal
Remove unused code in update poll
fixup coefficients's offset lost
can:
Fix possible memory overflow caused by RX
close can irq before release fifo
fix can warning in 64bit cpu (#8772)
fix compile warning in 64 bits arch cpu (#8739)
sdio:
fix a bug that read members in non-existent functions
fix an issue where repeated remove of card resulted in assertions
Fix the issue where ART-PI smart cannot read partitions on SD/EMMC.(#9058)
add HS400 support to mmc driver
port to the block
ofw:
fix initrd scan err
add cromfs start with bootargs cmd
fix ofw_alias_scan() bug (#8908)
Fixup irq parse map and map mask (#8992)
Support ID map interface (#8994)
io ranges use list to storage without ofw data (#8993)
Delete redundant strcasecmp function (#9779)
Fix when printf 0 addr by %p will return nil (#9741)
add pci
Fixed fdt_scan_memory() memory adjustment bug (#8853)
fix some uninitialize err (#8806)
misc:
Fix the calculation error in ADC voltage conversion.
random should copy size bytes of data to buffer (#9012)
fix pwm driver warnings
Fix potential return value discrepancy when writing to urandom
pic :
fix compile err in pic-gic (#9015)
Implement PIC irq state { get; set } (#9006)
add percpu interrupt info
remove intr disable
add isr statistics (#8955)
Make affinity helper interface (#8995)
Fixup PIC ktime depends (#9774)
Add pci api,the pci/pcie driver writer can use this to get resource of current device with flag,there are three flag :
Add ARM GICv2/v3 V2M, ITS support.(#9428)
support PIC cancel (only in debug)
fixup: pirq's child handler should lock less
fixup: set interrupt status when do traps
fixup: pirq reinit fail
delete nonexist include file
phy:
add one more parameter for mulitiple phys;add phy and mdio bus, add head, add ofw api to of net,driver writer can use this api get phy modes or get mac address
audio
fixup: audio_pipe function conflicts with POSIX PIPE when enabling POSIX IPC(#9404)
fixup: protect taken_list on shared lock(#9368)
lwp
feat: add unmap for null mapper (#9186)
Add VDSO functionality under the aarch64 architecture (#9176)
add mprotect config (#9082)
select console device dynamically (#8949)
fixup compiler warning (#8961)
arm: fixup signal handling (#8988)
add FIONREAD ioctl support for tty (#8996)
Initialize the user-mode SP before entering libc (#8997)
update sched_setaffinity() to use thread(task) ID (#9004)
libc
fix Compilation error in "driver.c", "completion_up.c", "syslog.c" and "dlmodule.c". (#9093)
Fix the issue where the destructor of C++11 thread_local objects and the actual memory release actions occur in the opposite order.
fix array overflow in rt_object name assignment
fix pointer-to-integer cast warnings and address truncation
uncomment wcwidth for win32 (#9823)
Add comments for timer fd APIs. (#9794)
Fix RT_USING_MUSLLIBC struct error bug (#9834)
add rt_sscanf
posix:
Add comments for thread local storage APIs
Fix the problem that it doesn't check if barrier still in use and dosen't destory the mutex either,
Fix the errors that assigning an integer to a pointer and always return EINVAL,
Fixed the issue that TLS did not initialize memory after applying for it
compilers:
add __rt_utest_tc_tab_start to support utest
Add RT_USING_RTC conditional compilation protection in ctimer.c
Fixed compile error when RT_USING_DEVICE is not enabled (#9145)
Fix issue with inconsistency between sig_mask and sigaddset implementations when using musl libc
Fix ctime () crashes
dfs
dfs v1 :
Remove warning for ops
Add comments and fix former comments error for dfs v1. (#9739)
Fixup ISO9660 build (#9790)
Fix cat command to output actual length
dfs v2 :
fix cromfs read out of mem range (#9197)
Mark dirty on unmap on shared mapping only (#9195)
fix tmpfs bug (#8970)
fixup out-of-memory access (#8973)
Fix cromfs bug (#10054)
releases the file pointer after closing the mmap file(#9917)
utilities
ulog: Fix the problem of file_buf being released incorrectly;add some comments to ulog for supplement.
ymodem: last frame's data_sz issue, fixed
Fix the issue of LOG_RAW asynchronous output being truncated.
Fix the issue of files not being closed after the sy command in Ymodem.
mm
improve sconscript (#9028)
fix DeprecationWarning: invalid escape sequence.
Fixed the problem of missing the refresh address translation table when unmap memory.
added affinity pages allocator
improve Kconfig structure on MM
install page in a discrete method
page poison debugging and assertion enhancements
Net
Update af_inet_at.c(#9065)
netdev: add statistics and more inupt parameters to ping command
add comments for BSD socket APIs.
add more socket flag (#9436)
sal/socket:
optimize sal_bind(#9413)
delete netdev_lo(#9431)
delay getting sal_proto_family in sal_ioctlsocket(#9429)
replace netdev's spin_lock_irqsave to spin_lock(#9423)
Add netdev ifindex feature, it will support SIOCGIFINDEX command and find netdev by ifindex
Add netgetdev api for configure routation
Increased the limit on the number of messages
Fix compilation error when SAL_TLS is turned on
at:
ktime
quality: remove recursion on hrtimer (#9110)
support period ktime timeout and multiple ktimer_hrtimer (#8972)
fixup use-after-free (#8928)
Address unsigned long overflow in some ktime function calculations (#9008)
improve ktimer sleep (#8838)
sdio
Fix the issue of not being able to read emmc/sd partitions on ART-PI samrt.(#9051)
add uhs-i mode support to sd driver
Fix wrong max data rate calculation logic
finsh
Add print logs for msh command failures
add msh command to bind thread to specific core (#9085)
When RT-USHING-POSIX_STDIO, use "get_console" to retrieve the current console descriptor
remove finsh_syscall_lookup() function declaration
solve data access bugs and fix shell.c strcat()
feat: add finsh thread entry hook
fal:
Log warning for block partition exceeding flash length
Fix the type mismatch issue in the FAL driver.
ipc:
Fix the abnormal release of resources when pipe creation fails.
If the requested space is insufficient and an appropriate space cannot be allocated, the new_rbb needs to be reclaimed.
Update the implementation of list traversal (#9869)
remove timer and use list. (#9825)
remove useless judgments from task scheduling (#9825)
remove RT_EBUSY return value comment (#9825)
Fixed the error that a hung thread in the queue pop cannot be resumed by push (#8839)
fix workqueue bug
feat: add ISR safe completion API fix
rt_atomic_dec_and_test
pm:
The device is registered 和 uninstalled by linked list
DM2.0
Feature:
Support virtual pin,LED, regulator
Support ATA AHCI (#9683) 、reset controller (#9630) 、hardware mailbox (#9599) 、PHY (external) (#9597) 、NVME (#9591) 、SCSI bus (#9592) 、DMA management (#9682) 、 IIO (Industrial I/O) (#9598) 、import SoC Pinctrl config
Support milkv-duo rt-smart
Support simple block layer
Support MFD syscon
Libcpu
aarch64:
Fixed the rt_hw_secondary_cpu_bsp_start() bug (#8898)
fix fdt_ptr error (#9138)
cleanup libcpu/aarch64 (#8950)
mmu log fixup (#9078)
memory setup using memblock (#9092)
Update kernel's boot link for ARM64
Add __rt_clz loss in aarch64 (#9774)
Improve memory mapping process (#9733)
fix No memory higher than 1 GB is mapped
Update thread self on sp-switch
Modify atomic implementation(#9364)
fix memheap search in setup of aarch64
aarch64 UMP compiler error (#8677)
improve performance of IRQ dis/en-able (#8687)
call PV_OFFSET on entry for once
quality: include the essential only to avoid recursion
Trimming General Context
arm:
implement cpuid get by assembly (#9052)
Correct ".cpu cortex-m4" to ".cpu cortex-m7"
add C11 atomic ticket spinlock (#8882)
discard rt_current_thread (#8976)
add hw thread self (#8942)
cortex-m7: Use hw atomic
cortex-m4: allows rewrite to interrupt enable/disable api to support independent interrupts management(#9305)
generic implementation of vector irq(#9336)
dealing with mem region out of kernel space (#8847)
riscv:
unify tick.c (#9164)
Bugfix/fix weak handle trap in riscv common crash rv64 trap handling (#9189)
support ARCH_REMAP_KERNEL on libcpu/c906 (#9123)
Fix missing break statements and update functions. (#9095)
Correct the issue where the user-mode sp is 8 less after exiting signal(#9080)
Restore gp before entering user mode from signal handling (#9072)
rv64: support for ARCH_REMAP_KERNEL (#9067)
add a doc for wch saving the irq stack as stack-512 (#10063)
Tools
Delete the tools/kconfiglib folder and use pip to install kconfiglib.
Let cmake generator get more param from rtconfig.py (#9139)
remove kconfig-frontends
fix the issue of the missing link flags added in Sconscript (#8957)
fix env toolchain path parse issue (#8936)
fix the issue of cc detection failure in Windows (#8914)
Address the incompatibility of str.decode() between Python 3 and Python 2 in tools/keil.py.
test kconfiglib is installed and info how to install
mkdist and sdk_dist support the kconfiglib syntax.
Add requirements.txt for python packages
Verify l4 platform, fix scons --dist
ci.attachconfig.yml is used in combination with scons
fix missing some flags added in Sconscript
get some info from env to save time (#10062)
iar.py fix scons --target=iar --dist (#9997)
pkgs --update-force instead of pkgs --update (#10042)
Fix cppcheck fail error in lwp.c (#9912)
Add sdk_cfg.json setting for env CC detection (#9890)
Add clangd support (#9772)
Add more c++ src file type (#9776)
Add zig target Support (#9787)
Fix the issue of missing commands in compile_commands.json(#9856)
Update workspace by compile_commands.json (#9781)
cmake: fix processing groups with similar name (#9667)
vsc: Add project.json generation in vsc.py (#9632)
fix the SDK path issue in env script.(#9362)
disable tools check temporarily
Add --cdb to make compile_commands.json.
set at_device package as strict mode
add workflow to check env 1.5.x stable version
fix doxygen ci grammar error
fix menuconfig error on vscode console (#8843)
Added clang-format configuration, supporting automatic code formatting via IDE or script.
fix EXEC_PATH exists, but the CC does not.
Add toolchain detection in sdk packages (#8827)
disable doxygen check
remove Jenkinsfile
Unify the invocation of kconfiglib with scons --menuconfig, --pyconfig, and --pyconfig-silent.
Add install env script
add RTduino libraries check
add footprint information when compiling
Unify env-related interfaces in tools and optimize env partial path splicing (#9185) ,
fix: add gd32h759i-start to CI,
add the keil ci check for runner
env_utility: [tools] fix the SDK package path issue
CMake: Generator re-write and bug fixes.
Action
use env install script to install env
remove env-v1.5.x checking
add bsp to bsp_buildings.yml
Resolve the issue of pull_request_template.md being accidentally moved to the issue_template directory (#9021)
Update the issue template to use an issue form format (#9011)
Revert "[action] add cvitek/c906_little ci" (#9945)
ci script associated with auto_utest. (#9933)
remove spell_check
update bsp_buildings.yml
set runner to ubuntu22.04 (#9874)
Remove rockchip/rk3568 because of the complie time
Attachconfig adapts yml syntax features (#9629)
Recursive folder lookup attachconfig.yml
Add toolchain stup script (#9453)
add cppcheck new feature(#9425)
Add summary for easy viewing of error messages(#9426)
add cppcheck project and action debug(#9401)
Supplementary part bsp, Component's label.(#9350)
add toolchain download link
Documents
Doxygen :
Fix some doxygen error.
add prefix for groups (#9991)
add prefix for page name (#9989)
create framework to unify markdown and source code part (#9946)
Introduce how to build & run doxygen on ubuntu (#9821)
Doxygen attach github pages (#9859)
Update doxygen rtthread_logo.png (#9861)
Add pwm、touch、can、i2c、spi、pin、dac、rtc、adcdriver example for doxygen
DFS :
finsh : fix the wrong comments for FINSH_USING_SYMTAB macro in markdown files.
Update STM32 BSP production tutorial
add driver example for doxygen (#9446)
fix source code catalog Name itemUtest
Remove useless code And Update mem documentation
fix dead link to contribution_guide.md in README.md README_es.md README_de.md
Utest
add device find (#8959)
remove delay for on thread testing (#9053)
Implementation of some test cases has been added.
Add implementation of more test case for rt_memcpy (#9823)
Add implementation of rt_memcmp test cases (#9823)
Add implementation of uassert_ptr_equal and uassert_ptr_not_equal (#9823)
Add rt_memcpy utest case (#9815)
Add rt_memset test case (#9831)
Add float operators uassert_float_equal and uassert_float_not_equal (#9868)
Add workqueue_tc (#9850)
Add rt_sprintf family functions test cases (#9820)
add mutex_pi_tc(#9353)
add smp testcases(#9356)
precise & readable mm fault type (#9047)
fix twice operation of uassert;(#9911)
fix an issue where macros are output directly when UTEST_UNIT_RUN is nested (#9868)
Optimize the utest to support new CI (#9815)
Remove rt_kprintf from TC_rt_sprintf.c (#9823)
make RT_USING_CI_ACTION to be clear RT_USING_CI_ACTION will select RT_UTEST_USING_AUTO_RUN and RT_UTEST_USING_ALL_CASES(#9889)
fix race in mutex tc & add recurse lock tc(#9365)
feat: print progress on testing
BSP
Some driver issues have been resolved and some driver support has been added...
Added some new BSPs
ST:
STM32H730 (#9962) 、stm32h723-st-nucleo board (#9738) 、stm32f407-lckfb-skystar、 stm32h7s7-st-disco、FK407M2-ZGT6
Infineon：
HT32:
HC32:
mm32f526x:
gd32:
gd32e503v-eval
gd32h759i-start bsp
renesas:
ra6e2-fpb
RZN2L-RSK(#9450) 、RZT2M-RSK、EtherKit
rpi4b:
canaan:
HPMicro:
fix pin ofw variable init. fixup errno passing on sys_mkdir() (#9007) Check the validity of the killpg signo parameter (#9981) Fix the problem of user mode parameter space occupying heap address space (#10014)
Fix the return value error when killing (pid < -1) Fixed the problem of not being able to find pid by file name (#9935) Kconfig: LWP_DEBUG default as n (#9921) add comments for lwp system calls. (#9934) fix TTYSUP_CFLAG did not include CBAUD flag (#9773) add signal kill all functionality (#9654) add system reboot and process teardown support (#9654) use c99 to implement traversal (#9654)
Fixup possible memory leaking on close() in pty Uncheck the specific cpu category that restricts rv in the script(#9438) remove extra check in sys_bind(#9412) fixup devfs porting layer of terminal (#8797)
fixup: uninitialized argument vector element Implementation of setpgrp and fix mmap2 problems (#9308) add error log when tid depleted, and return correct errno when clone failed (#9327)
fixup: compiler warning on cvitek risc-v cause by unsupport vDSO on rv64
fix exec and mount error code Fix logic error in POSIX thread local storage when looking for posix thread handle (#8790)
fix legacy macros will be added if cannot get the IAR version
Fix the issue of incorrect return of invalid parameters in aio_write
Fix incorrect naming of triggered Add procfs and fix ref count check error;(#9206) Separate dfs fs data structure ops;(#9205) Fix DFS_V2 error and FAL warning during compilation (#9826) Add support for dfs remount functionality (#9654) Fix dfs_devfs_open memory leak (#9899) Set errno according to POSIX (#9654) fixup: aligned proto of lseek to manual(#9447) Fix symlink system call return value is not expected(#9326) Fix link system call return value issue(#9325) Fix rmdir system call return value does not meet user expectations(#9328) Fix dup system call return value for user mode(#9324) remove duplicate lseek in devfs(#8859) fix symlink, relative path resolution(#8755)
add dfs pwrite pread Collecting some config to sub-menu (#9654) Add support for SERIAL_V2 (#9860) ;Fix the issue of data loss after socket disconnection for large data transmission volume;Fix the at socket semaphore release exception Fix the bug that udp communicates with multiple addresses for one socket、DNS locking prevents multithreading confusion 、Achieve at_gethostbyname_r、stability optimization(#9403)
netdb add at_gethostbyname_r
_gethostbyname_by_device
**lwip: **
Add support for independent dns services for multiple network devices (#9433) ;Hook functions are provided to provide greater flexibility for unknown Ethernet protocolsfix lwip poll macro conflict(#9434)
components: net: lwip: port: add netdev callback on link status change setting
Support import SoC CLK config
Support clock subprobe in OFW
Support driver depends fix auto
Add general sdhci driver it support pio&&sdma (#9649)
Add support PIC mailbox in AMP (#9762)
Add ms sleep for link status change
Make SoC Kconfig import easy
Basic PCI/PCIe (Peripheral Component Interconnect Express) bus
Extended drivers MISC interface
Merge ofw_parse and request_chan, use strict mode for device DMA pool
Fixup:
Fixup pin propname check
Fixup pin flags get from OFW and pin depend auto
Fixup PCI device ofw private node for MSI
Fixup pinctrl depend auto
Fixup MSI first IRQ read offset
Fixup PCI MSI global irq map
Fixup bitmap to new type (#9774)
Fixup block value init (#9774)
Fix smart uninitialized buffer on mount(2) (#9636)
Fix DFS partition memory leak (#9841)
Fixup platform request will deadlock
add comments for rv64 sv39 mmu APIs. (#10053) fix the PPN length error in GET_PPN(pte). (#10020)
fixup for parameter passing on backtrace
resolve compilation issues in cpuport. h under smp
add build script for vector module, use general vector support code for virt64
correct the alignment check of pv_offset
fix the issue of long jmp with call
Support riscv vector
Fix the system fails to boot properly if ARCH_USING_ASID=y when using ASID in the RV64 MMU
Add c908 cpu Optimize the judgment condition for selecting vendor directory in rv build script(#9455) feat: remove redundant codes under virt64, c906(#9154) feat: unify low-level bringups(#9181)
feat: unify interrupt & IO on rv64
feat: unify mmu related works
feat: unify context on c906, virt64
fit into common64 fixup for parameter passing on backtrace (#8655)
fixup for parameter passing on backtrace
adapt to rv64ilp32 toolchain