samples: fs: littlefs: add sample on stm32h747i-disco board

[mkaricheri]

This adds the required conf and dts overlays required for the application on stm32h747i-disco board

Build the application as

west build -p always -b stm32h747i_disco_m7
samples/subsys/fs/littlefs/ --
-DOVERLAY_CONFIG=boards/stm32h747i_disco_m7.conf -DCONF_FILE=prj_blk.conf

Here is the console log on STM32H747i-disco board with this commit

*** Booting Zephyr OS build zephyr-v3.5.0-500-gc00ed3858b2a ***
Sample program to r/w files on littlefs
I: LittleFS version 2.5, disk version 2.0

uartI: FS at SDMMC: is 31116288 0x200-byte blocks with 512 cycle
I: sizes: rd 512 ; pr 512 ; ca 512 ; la 2048
:~$ /SDMMC:: bsize = 512 ; frsize = 512 ; blocks = 31116288 ; bfree = 31116284

Listing dir /SDMMC: ...
[FILE] boot_count (size = 1)
[FILE] pattern.bin (size = 547)
/SDMMC:/boot_count read count:58 (bytes: 1)
/SDMMC:/boot_count write new boot count 59: [wr:1]
------ FILE: /SDMMC:/pattern.bin ------
3b aa aa aa aa aa aa aa 3c aa aa aa aa aa aa aa
3d aa aa aa aa aa aa aa 3e aa aa aa aa aa aa aa
3f aa aa aa aa aa aa aa 40 aa aa aa aa aa aa aa
41 aa aa aa aa aa aa aa 42 aa aa aa aa aa aa aa
43 aa aa aa aa aa aa aa 44 aa aa aa aa aa aa aa
45 aa aa aa aa aa aa aa 46 aa aa aa aa aa aa aa
47 aa aa aa aa aa aa aa 48 aa aa aa aa aa aa aa
49 aa aa aa aa aa aa aa 4a aa aa aa aa aa aa aa
4b aa aa aa aa aa aa aa 4c aa aa aa aa aa aa aa
4d aa aa aa aa aa aa aa 4e aa aa aa aa aa aa aa
4f aa aa aa aa aa aa aa 50 aa aa aa aa aa aa aa
51 aa aa aa aa aa aa aa 52 aa aa aa aa aa aa aa
53 aa aa aa aa aa aa aa 54 aa aa aa aa aa aa aa
55 aa aa aa aa aa aa aa 56 aa aa aa aa aa aa aa
57 aa aa aa aa aa aa aa 58 aa aa aa aa aa aa aa
59 aa aa aa aa aa aa aa 5a aa aa aa aa aa aa aa
5b aa aa aa aa aa aa aa 5c aa aa aa aa aa aa aa
5d aa aa aa aa aa aa aa 5e aa aa aa aa aa aa aa
5f aa aa aa aa aa aa aa 60 aa aa aa aa aa aa aa
61 aa aa aa aa aa aa aa 62 aa aa aa aa aa aa aa
63 aa aa aa aa aa aa aa 64 aa aa aa aa aa aa aa
65 aa aa aa aa aa aa aa 66 aa aa aa aa aa aa aa
67 aa aa aa aa aa aa aa 68 aa aa aa aa aa aa aa
69 aa aa aa aa aa aa aa 6a aa aa aa aa aa aa aa
6b aa aa aa aa aa aa aa 6c aa aa aa aa aa aa aa
6d aa aa aa aa aa aa aa 6e aa aa aa aa aa aa aa
6f aa aa aa aa aa aa aa 70 aa aa aa aa aa aa aa
71 aa aa aa aa aa aa aa 72 aa aa aa aa aa aa aa
73 aa aa aa aa aa aa aa 74 aa aa aa aa aa aa aa
75 aa aa aa aa aa aa aa 76 aa aa aa aa aa aa aa
77 aa aa aa aa aa aa aa 78 aa aa aa aa aa aa aa
79 aa aa aa aa aa aa aa 7a aa aa aa aa aa aa aa

7b aa aa aa aa aa aa aa 7c aa aa aa aa aa aa aa
7d aa aa aa aa aa aa aa 7e aa aa aa aa aa aa aa
7f aa e4
I: /SDMMC: unmounted
/SDMMC: unmount: 0

[github-actions]

Hello @mkaricheri, and thank you very much for your first pull request to the Zephyr project!
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[erwango]

Thanks for pushing this change. This lokks globally ok, but some changes are required.
While you're at it, would you mind adding a test entry in sample.yaml to ensure this will be actually built regularly in CI ?

[mkaricheri]

sample.yaml

I did add an entry, but not sure. Please check the update

[erwango]

Thanks for making the changes.
Some additional comments (I'd like we can get to the minimum working configuration)

[erwango]

Do you actually need those shell related config ?
(How is that specific to this board ?)

[mkaricheri]

removed in my latest update

[erwango]

This won't work. Since you need specific args to the build command, you need to specify them and hence create a new test variant:

  sample.filesystem.littlefs.stm32h747i_disco_m7_sdmmc:
    build_only: true
    platform_allow: stm32h747i_disco_m7
    extra_args:
      - OVERLAY_CONFIG=boards/stm32h747i_disco_m7.conf
      - CONF_FILE=prj_blk.conf

[mkaricheri]

OK, I don't know how to do this. Thanks for the snippet. I will add it,

[mkaricheri]

@erwango I have reworked the commit with all of your comments addressed per my understanding. Could you review when you have a chance and approve or let me know what else is needed?

Thanks
Murali

[erwango]

Thanks for the changes.
Approved

[mkaricheri]

Hi @de-nordic would you please review and approve if this looks good? Thanks

[de-nordic]

LittleFS sample configuration OK.

[github-actions]

Hi @mkaricheri!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁