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WAi.11
WAi.11
Associate II
June 19, 2020
Question

Question upon STM32F103, DCMI and PAL driver

  • June 19, 2020
  • 3 replies
  • 1625 views

Hello everyone~ Hope you guys are doing well.

I am recently working on OV2640 with STM32F103. As far as I discovered, most of the source code I found on the internet are OV2640 with F4 or F7 series, which are compatible with DCMI. And obviously F103 does not have DCMI, so my question is:

What is the way to control OV2640 without DCMI?

The second question is about the PAL library. During my searching for the solution of the aforementioned problem, I discovered someone use PAL library to control GPIO. I would like to know the difference between ordinary GPIO Library and PAL library. It would be great if there are some experts here giving me insights upon this question.

This topic has been closed for replies.

3 replies

waclawek.jan
waclawek.jan
Super User
June 19, 2020

Why do you think it may be possible to capture output from a camera on the 'F103?

The DCMI is used for a reason.

JW

WAi.11
WAi.11Author
Associate II
June 22, 2020

I agree with the point that DCMI exists for a reason. but on the other hand, I searched for solution and did find one or two solutions on the internet, using the PAL driver:

http://qyx.krtko.org/wiki/ov2640-stm32/index

that gives me hope to used OV2640 with F103, and I am asking here to see if it is feasible.

Tesla DeLorean
Tesla DeLorean
Guru
June 19, 2020

Perhaps the part has a data sheet or manual describing the expectations, and modes of operation?

If you can't manage the high data rates, FIFO's can be used for stills/frames, some camera's used to integrate these, or provide slower bandwidth methods to pull the internal frame buffers.

http://www.averlogic.com/AL422B.asp

DMA could be used on a bank of GPIO pins.

You could use a newer part, not the 12+ year old one, that supports the features you need.

HAL?

Probably some app notes or guides about migrating from SPL to HAL. https://www.st.com/en/development-tools/spl2ll-converter.html

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WAi.11
WAi.11Author
Associate II
June 22, 2020

What I want to achieve is capture a photo successfully per a minute. I think the data ate doesn't matter that much.

And PAL literally mean PAL (Ports Abstraction Layer). As mentioned I found someone using PAL and was curious about the difference it and ordinary GPIO Library.

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