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STM32F4 Camera with STM32F7 Discovery board?

Forum|Forum|9 years ago
February 19, 2017
6 replies
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Posted on February 19, 2017 at 20:59

Hi all,

I'm trying to use the camera

STM32F4DIS-CAM

with my STM32F7 Discovery board, with Keil uVision IDE. I have downloaded STM32Cube, and in the examples there is a BSP directory, with BSP drivers examples, including a camera.c for the camera. All the drivers are working well (LCD, Touchscreen, audio, sram...), but the programm stops when the Camera example starts. It seems that the initialization is OK, I can see 'QQVGA camera stream', but then nothing happens, the stream is only a white screen, and the touch actions do not work (change brighness, contrast...). The 'user button' also do not work anymore...

Do you have an idea of the way I should follow to solve such problem?

Thank you.

Best regards,

This topic has been closed for replies.

Best answer by Xav Cachan

Posted on March 01, 2017 at 19:11

Hi all,

I have finally found a solution: it seems that the stm32f7xx_it.c (version 1.1.0) in the BSP camera example of STMCube for STM32F7 is badly written. As a conclusion, the programm goes into infinite loop and the screen is white.

For my solution, all the changes have to be done in stm32f7xx_it.c file (maybe ST should modify the file included in the STMCube_FW_F7 package):

1. at the beginning of the file, include the camera handler with

/* Camera handler declared in 'stm32746g_discovery_camera.c' file */

extern DCMI_HandleTypeDef hDcmiHandler;

2. Modify the function DMA2_Stream1_IRQHandler as follows:

void DMA2_Stream1_IRQHandler(void)

{

//BSP_CAMERA_DMA_IRQHandler();

HAL_DMA_IRQHandler(hDcmiHandler.DMA_Handle);

}

3. Modify the function DCMI_IRQHandler as follows:

void DCMI_IRQHandler(void)

{

//BSP_CAMERA_IRQHandler();

HAL_DCMI_IRQHandler(&hDcmiHandler);

}

Everything works fine now for me. Hope it will help.

(Thanks to Aditya Manglik web site, it gives some interesting hints!)

Best regards,

Xavier

I

Imen.D

ST Technical Moderator

Posted on February 22, 2017 at 19:42

Hi

cachan.xav

‌,

Maybe you should check and look more carefully atyour configuration. Then,I suggest you to debug, localize where the code hangs/stop,and the kind of message gives.

This will help toidentify what is the problem that you have.

Otherwise, you can share your code and debugger screenshot,thatwillbe easier for user forum to understand the issue andhelp you.

PleaseKeep me informed about your progresson this problem.

Regards

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks

Xav CachanAuthor

Associate

Posted on February 22, 2017 at 21:09

Thank you Imen for your answer ! I am so happy that someone tries to help !

For my project, I have only downloaded STM32Cube package, and opened the

uVision STM example proposed in the BSP directory. Then I have just

validated the camera.c in the main file, connected the camera to the

board, and tried to execute the code. Nothing else has been changed in

the configuration, so I do not understand what can be wrong.

I have tried to debug, please see the attached file. It seems that the

programm calls DMA2_Stream1 IRQ, but the corresponding ASM code shows

that we then stay in an infinite loop (instruction in 0x08001dD4C is

branch on ... 0x08001D4C).

If you have any idea...

Thank you again.

Best regards,

Xavier

Le 22/02/2017 à 19:45, IMEN D a écrit :