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sys/ztimer: add support for timers running at a 500kHz frequency#21553

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aabadie merged 1 commit intoRIOT-OS:masterfrom
aabadie:ztimer_500k
Jun 19, 2025
Merged

sys/ztimer: add support for timers running at a 500kHz frequency#21553
aabadie merged 1 commit intoRIOT-OS:masterfrom
aabadie:ztimer_500k

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@aabadie aabadie commented Jun 17, 2025 •
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Contribution description

I'm working on a port for a custom chip in which the peripheral timer runs at 500kHz. I applied this patch to make ztimer work correctly over it.
Maybe there's a better way, e.g with less code duplication.

Testing procedure

Run tests/sys/ztimer_msg on the custom chip:

With this PR 
$ BUILD_IN_DOCKER=1 make BOARD=scum-devkit -C tests/sys/ztimer_msg/ --no-print-directory flash test
Launching build container using image "docker.io/riot/riotbuild@sha256:21c416fbbb94a99c3d9c76341baf5a9740608b1d1af89967127c7a171248fd7b".
docker run --rm --tty --user $(id -u) --platform linux/amd64 -v '/usr/share/zoneinfo/Europe/Paris:/etc/localtime:ro' -v '/work/riot/RIOT:/data/riotbuild/riotbase:delegated' -v '/home/aabadie/.cargo/registry:/data/riotbuild/.cargo/registry:delegated' -v '/home/aabadie/.cargo/git:/data/riotbuild/.cargo/git:delegated' -e 'RIOTBASE=/data/riotbuild/riotbase' -e 'CCACHE_BASEDIR=/data/riotbuild/riotbase' -e 'BUILD_DIR=/data/riotbuild/riotbase/build' -e 'BUILD_IN_DOCKER=/data/riotbuild/riotbase/tests/sys/ztimer_msg/1' -e 'RIOTPROJECT=/data/riotbuild/riotbase' -e 'RIOTCPU=/data/riotbuild/riotbase/cpu' -e 'RIOTBOARD=/data/riotbuild/riotbase/boards' -e 'RIOTMAKE=/data/riotbuild/riotbase/makefiles'      -e 'BOARD=scum-devkit' -e 'DISABLE_MODULE=' -e 'DEFAULT_MODULE=test_utils_interactive_sync test_utils_print_stack_usage' -e 'FEATURES_REQUIRED=' -e 'FEATURES_BLACKLIST=' -e 'FEATURES_OPTIONAL=' -e 'USEMODULE=ztimer_usec' -e 'USEPKG='  -w '/data/riotbuild/riotbase/tests/sys/ztimer_msg/' 'docker.io/riot/riotbuild@sha256:21c416fbbb94a99c3d9c76341baf5a9740608b1d1af89967127c7a171248fd7b' make 'BOARD=scum-devkit'    
Building application "tests_ztimer_msg" for "scum-devkit" with CPU "scum".

"make" -C /data/riotbuild/riotbase/pkg/cmsis/ 
"make" -C /data/riotbuild/riotbase/pkg/scum-sdk/ 
"make" -C /data/riotbuild/riotbase/build/pkg/scum-sdk/sdk/bsp -f /data/riotbuild/riotbase/pkg/scum-sdk/scum-sdk.mk
"make" -C /data/riotbuild/riotbase/boards
"make" -C /data/riotbuild/riotbase/boards/common/init
"make" -C /data/riotbuild/riotbase/boards/scum-devkit
"make" -C /data/riotbuild/riotbase/core
"make" -C /data/riotbuild/riotbase/core/lib
"make" -C /data/riotbuild/riotbase/cpu/scum
"make" -C /data/riotbuild/riotbase/cpu/cortexm_common
"make" -C /data/riotbuild/riotbase/cpu/cortexm_common/periph
"make" -C /data/riotbuild/riotbase/cpu/scum/periph
"make" -C /data/riotbuild/riotbase/drivers
"make" -C /data/riotbuild/riotbase/drivers/periph_common
"make" -C /data/riotbuild/riotbase/sys
"make" -C /data/riotbuild/riotbase/sys/auto_init
"make" -C /data/riotbuild/riotbase/sys/div
"make" -C /data/riotbuild/riotbase/sys/frac
"make" -C /data/riotbuild/riotbase/sys/isrpipe
"make" -C /data/riotbuild/riotbase/sys/libc
"make" -C /data/riotbuild/riotbase/sys/malloc_thread_safe
"make" -C /data/riotbuild/riotbase/sys/newlib_syscalls_default
"make" -C /data/riotbuild/riotbase/sys/preprocessor
"make" -C /data/riotbuild/riotbase/sys/stdio
"make" -C /data/riotbuild/riotbase/sys/stdio_uart
"make" -C /data/riotbuild/riotbase/sys/test_utils/interactive_sync
"make" -C /data/riotbuild/riotbase/sys/test_utils/print_stack_usage
"make" -C /data/riotbuild/riotbase/sys/tsrb
"make" -C /data/riotbuild/riotbase/sys/ztimer
   text	   data	    bss	    dec	    hex	filename
  15452	    232	   4700	  20384	   4fa0	/data/riotbuild/riotbase/tests/sys/ztimer_msg/bin/scum-devkit/tests_ztimer_msg.elf
scum-programmer --port /dev/ttyACM0 --calibrate /work/riot/RIOT/tests/sys/ztimer_msg/bin/scum-devkit/tests_ztimer_msg.bin
Starting Scum Programmer
Firmware size:     15684B
Loading firmware to RAM: 100%|██████████████████████████████| 16384/16384 [00:00<00:00, 32868.92B/s]
Booting SCuM...    ✔
Calibrating...     ✔
Done in 1.817s
r
/work/riot/RIOT/dist/tools/pyterm/pyterm -p "/dev/ttyUSB0" -b "19200" -ln "/tmp/pyterm-aabadie" -rn "2025-06-17_13.40.33-tests_ztimer_msg-scum-devkit" --no-reconnect --noprefix --no-repeat-command-on-empty-line 
Twisted not available, please install it if you want to use pyterm's JSON capabilities
Connect to serial port /dev/ttyUSB0
Welcome to pyterm!
Type '/exit' to exit.
READY
s
START
main(): This is RIOT! (Version: 2025.07-devel-412-g26d4e-scum_support)
This is thread 2
sending 1st msg
now=3:496168 -> every 2.0s: Hello World
sending 2nd msg
now=3:524840 -> every 5.0s: This is a Test
This is thread 3
sec=4 min=0 hour=0
now=5:516988 -> every 2.0s: Hello World
sec=5 min=0 hour=0
sec=6 min=0 hour=0
now=7:531188 -> every 2.0s: Hello World
sec=7 min=0 hour=0
now=8:547196 -> every 5.0s: This is a Test
sec=8 min=0 hour=0
now=9:545386 -> every 2.0s: Hello World
sec=9 min=0 hour=0
sec=10 min=0 hour=0
now=11:559584 -> every 2.0s: Hello World
sec=11 min=0 hour=0
sec=12 min=0 hour=0
now=13:562968 -> every 5.0s: This is a Test
now=13:579016 -> every 2.0s: Hello World
sec=13 min=0 hour=0
sec=14 min=0 hour=0
now=15:600258 -> every 2.0s: Hello World
sec=15 min=0 hour=0
sec=16 min=0 hour=0
now=17:614986 -> every 2.0s: Hello World
sec=17 min=0 hour=0
now=18:579266 -> every 5.0s: This is a Test
sec=18 min=0 hour=0
now=19:629724 -> every 2.0s: Hello World
sec=19 min=0 hour=0
sec=20 min=0 hour=0
now=21:644462 -> every 2.0s: Hello World
sec=21 min=0 hour=0
sec=22 min=0 hour=0
now=23:595576 -> every 5.0s: This is a Test
now=23:659190 -> every 2.0s: Hello World
sec=23 min=0 hour=0
sec=24 min=0 hour=0
now=25:673938 -> every 2.0s: Hello World
sec=25 min=0 hour=0
sec=26 min=0 hour=0
now=27:688688 -> every 2.0s: Hello World
sec=27 min=0 hour=0
now=28:611890 -> every 5.0s: This is a Test
sec=28 min=0 hour=0
now=29:703436 -> every 2.0s: Hello World
sec=29 min=0 hour=0
sec=30 min=0 hour=0
now=31:718186 -> every 2.0s: Hello World
sec=31 min=0 hour=0
sec=32 min=0 hour=0
now=33:628206 -> every 5.0s: This is a Test
now=33:732926 -> every 2.0s: Hello World
sec=33 min=0 hour=0
sec=34 min=0 hour=0
now=35:747678 -> every 2.0s: Hello World
sec=35 min=0 hour=0
sec=36 min=0 hour=0
now=37:762430 -> every 2.0s: Hello World
sec=37 min=0 hour=0
now=38:644518 -> every 5.0s: This is a Test
Without this PR 
$ BUILD_IN_DOCKER=1 make BOARD=scum-devkit -C tests/sys/ztimer_msg/ --no-print-directory flash test
Launching build container using image "docker.io/riot/riotbuild@sha256:21c416fbbb94a99c3d9c76341baf5a9740608b1d1af89967127c7a171248fd7b".
docker run --rm --tty --user $(id -u) --platform linux/amd64 -v '/usr/share/zoneinfo/Europe/Paris:/etc/localtime:ro' -v '/work/riot/RIOT:/data/riotbuild/riotbase:delegated' -v '/home/aabadie/.cargo/registry:/data/riotbuild/.cargo/registry:delegated' -v '/home/aabadie/.cargo/git:/data/riotbuild/.cargo/git:delegated' -e 'RIOTBASE=/data/riotbuild/riotbase' -e 'CCACHE_BASEDIR=/data/riotbuild/riotbase' -e 'BUILD_DIR=/data/riotbuild/riotbase/build' -e 'BUILD_IN_DOCKER=/data/riotbuild/riotbase/tests/sys/ztimer_msg/1' -e 'RIOTPROJECT=/data/riotbuild/riotbase' -e 'RIOTCPU=/data/riotbuild/riotbase/cpu' -e 'RIOTBOARD=/data/riotbuild/riotbase/boards' -e 'RIOTMAKE=/data/riotbuild/riotbase/makefiles'      -e 'BOARD=scum-devkit' -e 'DISABLE_MODULE=' -e 'DEFAULT_MODULE=test_utils_interactive_sync test_utils_print_stack_usage' -e 'FEATURES_REQUIRED=' -e 'FEATURES_BLACKLIST=' -e 'FEATURES_OPTIONAL=' -e 'USEMODULE=ztimer_usec' -e 'USEPKG='  -w '/data/riotbuild/riotbase/tests/sys/ztimer_msg/' 'docker.io/riot/riotbuild@sha256:21c416fbbb94a99c3d9c76341baf5a9740608b1d1af89967127c7a171248fd7b' make 'BOARD=scum-devkit'    
Building application "tests_ztimer_msg" for "scum-devkit" with CPU "scum".

"make" -C /data/riotbuild/riotbase/pkg/cmsis/ 
"make" -C /data/riotbuild/riotbase/pkg/scum-sdk/ 
"make" -C /data/riotbuild/riotbase/build/pkg/scum-sdk/sdk/bsp -f /data/riotbuild/riotbase/pkg/scum-sdk/scum-sdk.mk
"make" -C /data/riotbuild/riotbase/boards
"make" -C /data/riotbuild/riotbase/boards/common/init
"make" -C /data/riotbuild/riotbase/boards/scum-devkit
"make" -C /data/riotbuild/riotbase/core
"make" -C /data/riotbuild/riotbase/core/lib
"make" -C /data/riotbuild/riotbase/cpu/scum
"make" -C /data/riotbuild/riotbase/cpu/cortexm_common
"make" -C /data/riotbuild/riotbase/cpu/cortexm_common/periph
"make" -C /data/riotbuild/riotbase/cpu/scum/periph
"make" -C /data/riotbuild/riotbase/drivers
"make" -C /data/riotbuild/riotbase/drivers/periph_common
"make" -C /data/riotbuild/riotbase/sys
"make" -C /data/riotbuild/riotbase/sys/auto_init
"make" -C /data/riotbuild/riotbase/sys/div
"make" -C /data/riotbuild/riotbase/sys/frac
"make" -C /data/riotbuild/riotbase/sys/isrpipe
"make" -C /data/riotbuild/riotbase/sys/libc
"make" -C /data/riotbuild/riotbase/sys/malloc_thread_safe
"make" -C /data/riotbuild/riotbase/sys/newlib_syscalls_default
"make" -C /data/riotbuild/riotbase/sys/preprocessor
"make" -C /data/riotbuild/riotbase/sys/stdio
"make" -C /data/riotbuild/riotbase/sys/stdio_uart
"make" -C /data/riotbuild/riotbase/sys/test_utils/interactive_sync
"make" -C /data/riotbuild/riotbase/sys/test_utils/print_stack_usage
"make" -C /data/riotbuild/riotbase/sys/tsrb
"make" -C /data/riotbuild/riotbase/sys/ztimer
   text	   data	    bss	    dec	    hex	filename
  15892	    232	   4716	  20840	   5168	/data/riotbuild/riotbase/tests/sys/ztimer_msg/bin/scum-devkit/tests_ztimer_msg.elf
scum-programmer --port /dev/ttyACM0 --calibrate /work/riot/RIOT/tests/sys/ztimer_msg/bin/scum-devkit/tests_ztimer_msg.bin
Starting Scum Programmer
Firmware size:     16124B
Loading firmware to RAM: 100%|██████████████████████████████| 16384/16384 [00:00<00:00, 33208.26B/s]
Booting SCuM...    ✔
Calibrating...     ✔
Done in 1.813s
r
/work/riot/RIOT/dist/tools/pyterm/pyterm -p "/dev/ttyUSB0" -b "19200" -ln "/tmp/pyterm-aabadie" -rn "2025-06-17_13.44.35-tests_ztimer_msg-scum-devkit" --no-reconnect --noprefix --no-repeat-command-on-empty-line 
Twisted not available, please install it if you want to use pyterm's JSON capabilities
Connect to serial port /dev/ttyUSB0
Welcome to pyterm!
Type '/exit' to exit.
READY
s
START
main(): This is RIOT! (Version: 2025.07-devel-411-g919bab-scum_support)
This is thread 2
sending 1st msg
now=3:523096 -> every 2.0s: Hello World
sending 2nd msg
now=3:551768 -> every 5.0s: This is a Test
This is thread 3
sec=4 min=0 hour=0
now=5:544140 -> every 2.0s: Hello World
sec=5 min=0 hour=0
sec=6 min=0 hour=0
now=7:558618 -> every 2.0s: Hello World
sec=7 min=0 hour=0
now=8:574346 -> every 5.0s: This is a Test
sec=8 min=0 hour=0
now=9:573092 -> every 2.0s: Hello World
sec=9 min=0 hour=0
sec=10 min=0 hour=0
now=11:587568 -> every 2.0s: Hello World
sec=11 min=0 hour=0
sec=12 min=0 hour=0
now=13:590394 -> every 5.0s: This is a Test
now=13:606608 -> every 2.0s: Hello World
sec=13 min=0 hour=0
sec=14 min=0 hour=0
now=15:627962 -> every 2.0s: Hello World
sec=15 min=0 hour=0
sec=16 min=0 hour=0
now=17:642968 -> every 2.0s: Hello World
sec=17 min=0 hour=0
now=18:606970 -> every 5.0s: This is a Test
sec=18 min=0 hour=0
now=19:657982 -> every 2.0s: Hello World
sec=19 min=0 hour=0
sec=20 min=0 hour=0
now=21:673006 -> every 2.0s: Hello World
sec=21 min=0 hour=0
sec=22 min=0 hour=0
now=23:623558 -> every 5.0s: This is a Test
now=23:688020 -> every 2.0s: Hello World
sec=23 min=0 hour=0
sec=24 min=0 hour=0
now=25:703050 -> every 2.0s: Hello World
sec=25 min=0 hour=0
sec=26 min=0 hour=0
now=27:718078 -> every 2.0s: Hello World
sec=27 min=0 hour=0
Timeout in expect script at "child.expect(r"now=\d+:\d+ -> every 5.0s: This is a Test")" (tests/sys/ztimer_msg/tests/01-run.py:26)

Issues/PRs references

None

@github-actions github-actions bot added Area: timers Area: timer subsystems Area: sys Area: System labels Jun 17, 2025
@crasbe crasbe added Type: enhancement The issue suggests enhanceable parts / The PR enhances parts of the codebase / documentation CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR labels Jun 17, 2025
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riot-ci commented Jun 17, 2025

Murdock results

✔️ PASSED

bc24172 sys/ztimer: add support for 500kHz timer frequency

Success Failures Total Runtime
10379 0 10379 09m:14s

Artifacts

@aabadie aabadie added this pull request to the merge queue Jun 19, 2025
Merged via the queue into RIOT-OS:master with commit 4db7d01 Jun 19, 2025
28 checks passed
@Teufelchen1 Teufelchen1 added this to the Release 2025.07 milestone Jul 14, 2025
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Reviewers

@benpicco benpicco benpicco approved these changes

@kaspar030 kaspar030 Awaiting requested review from kaspar030 kaspar030 is a code owner

@bergzand bergzand Awaiting requested review from bergzand bergzand is a code owner

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Labels

Area: sys Area: System Area: timers Area: timer subsystems CI: ready for build If set, CI server will compile all applications for all available boards for the labeled PR Type: enhancement The issue suggests enhanceable parts / The PR enhances parts of the codebase / documentation

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Milestone

Release 2025.07

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5 participants

@aabadie @riot-ci @benpicco @crasbe @Teufelchen1