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cpu, boards: add stm32c0 #20939

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@jparker324
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Adding updated STM32C0 targets per https://www.st.com/en/microcontrollers-microprocessors/stm32c0x1.html

image

Supported cpu targets now include STM32C011, STM32C031, STM32C051, STM32C071, STM32C091, and STM32C092.

Added board targets stm32c0116-dk and stm32c0316-dk, further resolving issue #19210, and nucleo-c071rb (https://www.st.com/en/evaluation-tools/nucleo-c071rb.html).

General reference issue #19264

@github-actions github-actions bot added Platform: ARM Platform: This PR/issue effects ARM-based platforms Area: doc Area: Documentation Area: build system Area: Build system Area: boards Area: Board ports Area: cpu Area: CPU/MCU ports Area: Kconfig Area: Kconfig integration labels Oct 23, 2024
@jparker324 jparker324 marked this pull request as draft October 23, 2024 19:55
@jparker324 jparker324 marked this pull request as ready for review October 23, 2024 20:14
@github-actions github-actions bot added Area: tests Area: tests and testing framework Area: examples Area: Example Applications labels Oct 24, 2024
@jparker324 jparker324 force-pushed the stm32c0-additions branch 2 times, most recently from b030b16 to 9fbb04a Compare October 24, 2024 17:15
@jparker324 jparker324 marked this pull request as draft October 24, 2024 17:23
@jparker324 jparker324 marked this pull request as ready for review October 25, 2024 13:29
@benpicco
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benpicco commented Nov 4, 2024

Very nice!
Can you please split up the commit into one for the CPU changes, one for each new board and then another one for the Makefile.ci updates?

Thank you!

@jparker324
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Very nice! Can you please split up the commit into one for the CPU changes, one for each new board and then another one for the Makefile.ci updates?

Thank you!

@benpicco updated commits 👍

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benpicco reviewed Nov 13, 2024
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@benpicco benpicco left a comment •
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sorry to nitpick, but please further split up the commits, one per board. And then one for the CPU, so you have

  • cpu/stm32: add new STM32C0 lines
  • boards/nucleo-c071rb: add support
  • boards/stm32c0116-dk: initial support
  • boards/stm32c0116-disco: initial support
  • treewide: add new stm32c0 boards to Makefile.ci

Do you have some test output?
The periph tests would be most interesting (tests/periph/spi, tests/periph/i2c, tests/periph/uart), and since this line had some issues there in the past, I'd check especially tests/periph/rtc and tests/periph/rtt

boards/stm32c0116-dk/dist/openocd.cfg
source [find interface/stlink-v2.cfg]
source [find target/stm32c0x.cfg]

#reset_config srst_only
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Can be dropped?

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Looking into this, the lines-

source [find target/stm32c0x.cfg]
reset_config srst_only
$_TARGETNAME configure -rtos auto

are included in https://github.com/RIOT-OS/RIOT/blob/master/boards/common/stm32/dist/stm32c0.cfg so I'm betting they can be removed from the various C0 board openocd.cfg files?

boards/stm32c0116-dk/dist/openocd.cfg
Comment on lines +5 to +7
#reset_config srst_only

#$_TARGETNAME configure -rtos auto
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Why commented out?

boards/nucleo-c031c6/include/periph_conf.h
* Table 11, page 20.
*
* STM32C031C6 do not have internal channel for VBAT, more details provided
* in the MCU datasheet - section 3.14, page 20.
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Is this no longer true?

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It is true that C0 does not have an internal channel for VBAT. It is not true that more details are provided in the datasheet.

At the time of the initial C011 and C031 support, this was a relevant difference from other ST parts (like the G0 family), but now it seems that it's common to all the C0 family parts. I figured it wasn't good practice to list all the things the micro doesn't have as that list would forever be incomplete. :)

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kfessel commented Dec 4, 2024 •
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formal: <area of work>: is missing for title and commits just saw @benpicco already said that and provided possible titles

https://github.com/RIOT-OS/RIOT/blob/master/CONTRIBUTING.md#commit-conventions

@kfessel kfessel changed the title including additional stm32c0 cpu and board targets cpu, boards: add stm32c0 Dec 4, 2024
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crasbe commented Feb 17, 2025

I accidentally intentionally bought a Nucleo-C071RB last week, so I can give this a test.

Unfortunately it does not compile for me:

RIOT/tests/periph/adc$ BOARD=nucleo-c071rb make hexfile -j12
Traceback (most recent call last):
  File "/home/cbuec/riot-stm32c0/RIOT/cpu/stm32/dist/irqs/gen_vectors.py", line 147, in <module>
    main(PARSER.parse_args())
  File "/home/cbuec/riot-stm32c0/RIOT/cpu/stm32/dist/irqs/gen_vectors.py", line 138, in main
    context = parse_cmsis(args.cmsis_dir, args.cpu_line)
  File "/home/cbuec/riot-stm32c0/RIOT/cpu/stm32/dist/irqs/gen_vectors.py", line 63, in parse_cmsis
    with open(cpu_line_cmsis, 'rb') as cmsis:
FileNotFoundError: [Errno 2] No such file or directory: '/home/cbuec/riot-stm32c0/RIOT/build/stm32/cmsis/c0/Include/stm32c071xx.h'
make: *** [/home/cbuec/riot-stm32c0/RIOT/cpu/stm32/Makefile.include:109: /home/cbuec/riot-stm32c0/RIOT/cpu/stm32/vectors/STM32C071xx.c] Error 1
make: *** Waiting for unfinished jobs....

The cause of this is that an old CMSIS version is loaded. Fron the RIOT/build/stm32/cmsis/c0/Release_Notes.html
image

The support for the C071 was only added in Version 1.2.0: https://github.com/STMicroelectronics/cmsis-device-c0/commits/main/Include/stm32c071xx.h

These lines have to be updated:

RIOT/cpu/stm32/Makefile.cmsis

Lines 6 to 7 in 26e46ae

# v1.1.0
PKG_VERSION_c0=7e32bf9d8117ee4c8f6a1d138b814fc24bf4c906 

# v1.3.0
PKG_VERSION_c0=517611273f835ffe95318947647bc1408f69120d

With that change, the tests/periph/adc test compiles and runs on the C071RB Nucleo.

@crasbe crasbe mentioned this pull request Feb 19, 2025
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crasbe commented Apr 23, 2025

@jparker324 are you still interested in getting this merged? I think it only requires small changes (like a rebase after #21135 to reflect the new examples folder structure).

This was referenced Oct 9, 2025
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crasbe commented Oct 10, 2025

Closed as this is replaced by #21775 and #21776.

@crasbe crasbe closed this Oct 10, 2025
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