drivers: video: ov7670: update the camera init sequence #91760
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avolmat-st,
josuah,
loicpoulain and
ngphibang
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This PR is meant to fix nxp-mcuxpresso/mcuxsdk-core#3 |
The previous initialization sequence fails to configure the module properly. Update the sequence using the code provided by vendor. The update is verified using the FRDM-MCXN947 SmartDMA camera case under samples/drivers/video/capture. Signed-off-by: Kate Wang <[email protected]>
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josuah
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Jun 17, 2025
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This works very well!
Photo of the ceiling old wooden beam taken with it, using the UVC branch:
west build samples/subsys/usb/uvc --board frdm_mcxn947/mcxn947/cpu0 --shield dvp_20pin_ov7670
It seems like there was an issue with how PCLK was driven. Good for us to know in the future.
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@KATE-WANG-NXP Thank you very much for helping fixing this (and @josuah for the test). |
ngphibang
approved these changes
Jun 18, 2025
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if fails at my board |
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Hi @KATE-WANG-NXP , could you please check the error @hakehuang mentioned? thanks. |
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It fails right at pritnting controls ... maybe address2line would help to debug ?. I don't have a valid mcxn947 board now to test unfortunately |
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Hi all. My toolchain info: └─▶ west build -b frdm_mcxn947/mcxn947/cpu0 --shield dvp_20pin_ov7670 -p
-- west build: generating a build system
Loading Zephyr default modules (Zephyr base).
-- Application: /home/marin/code/zephyrproject/zephyr/samples/subsys/usb/uvc
-- CMake version: 4.0.3-dirty
-- Found Python3: /home/marin/code/zephyrproject/.venv/bin/python3 (found suitable version "3.13.3", minimum required is "3.12") found components: Interpreter
-- Cache files will be written to: /home/marin/.cache/zephyr
-- Zephyr version: 4.1.99 (/home/marin/code/zephyrproject/zephyr)
-- Found west (found suitable version "1.3.0", minimum required is "0.14.0")
-- Board: frdm_mcxn947, qualifiers: mcxn947/cpu0
-- Shield(s): dvp_20pin_ov7670
-- ZEPHYR_TOOLCHAIN_VARIANT not set, trying to locate Zephyr SDK
-- Found host-tools: zephyr 0.17.0 (/home/marin/.local/share/zephyr-sdk/zephyr-sdk-0.17.0)
-- Found toolchain: zephyr 0.17.0 (/home/marin/.local/share/zephyr-sdk/zephyr-sdk-0.17.0)
-- Found Dtc: /home/marin/.local/share/zephyr-sdk/zephyr-sdk-0.17.0/sysroots/x86_64-pokysdk-linux/usr/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6")I've built sample with different log variants and they all exhibit different behavior. I've recorded logs from serial for all variants. Access to video device is done using Deferred loggingBuilt with Due to deferred logging lot of messages is being dropped. I've recorded couple of runs trying to catch fault and it USAGE FAULT is escalated in main thread. Two warning messages are always present Usage fault snippet from deferred logsImmediate loggingBuilt with This variant triggers stack overflow, again in main thread. Usage fault snippet from immediate logsMinimal loggingBuilt with This variant keeps running even though same warning messages are present as with deferred logging. Usage fault snippet from minimal logs |
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Thank you for the tests @marinjurjevic! I opened that issue for following-up on this: It seems related to timing more than the OV7670 but did not dive in-depth. |
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The previous initialization sequence fails to configure the module properly. Update the sequence using the code provided by vendor. The update is verified using the FRDM-MCXN947 SmartDMA camera case under samples/drivers/video/capture using command:
west build -b frdm_mcxn947/mcxn947/cpu0 samples/drivers/video/capture -DCONFIG_DEBUG_OPTIMIZATIONS=y -d n947_camera -DSHIELD="lcd_par_s035_8080;dvp_20pin_ov7670"