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

aabadie · 2025-06-17T11:48:49Z

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

riot-ci · 2025-06-17T12:02:49Z

Murdock results

✔️ PASSED

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

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

Artifacts

Documentation preview

sys/ztimer: add support for 500kHz timer frequency

bc24172

aabadie requested review from kaspar030 and bergzand as code owners June 17, 2025 11:48

github-actions bot added Area: timers Area: timer subsystems Area: sys Area: System labels Jun 17, 2025

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

benpicco approved these changes Jun 18, 2025

View reviewed changes

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 added this to the Release 2025.07 milestone Jul 14, 2025

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

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

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aabadie commented Jun 17, 2025 •

edited

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riot-ci commented Jun 17, 2025

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

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

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aabadie commented Jun 17, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Contribution description

Testing procedure

Issues/PRs references

Uh oh!

riot-ci commented Jun 17, 2025

Murdock results

Artifacts

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aabadie commented Jun 17, 2025 •

edited

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