Less memory on new firmware?

OpenMV Boards
1

Hello,
I was porting a program made for a “OPENMV4P with STM32H743” running on the 4.3.1 (may 2022) firmware.
It allocates 2 frame buffers with a sensor.WQXGA2 framesize.

        sensor.dealloc_extra_fb()
        sensor.dealloc_extra_fb()
        
        # Allocate frame buffers for reference and original images
        self.img_ref_fb = sensor.alloc_extra_fb(self.image_width, self.image_height, self.sensor_pixformat)
        self.img_ori_fb = sensor.alloc_extra_fb(self.image_width, self.image_height, self.sensor_pixformat)

When I try to allocate this much using the 4.6.20 firmware I get “out of fast frame buffer stack memory”. How (or where ?) could I use this much memory with the new firmware? also I’m not sure I understood what were frame buffers.

2

Yeah, we reduced the frame buffer stack so the heap could be larger.

This means that doing what you want is not possible without firmware customization. You can edit the heap/frame buffer stack size here: openmv/boards/OPENMV4P/omv_boardconfig.h at master · openmv/openmv · GitHub

And reduce the heap here: openmv/boards/OPENMV4P/omv_boardconfig.h at master · openmv/openmv · GitHub

Note that we have 27MB for the FB stack already… however, what you are trying to do requires like 30MB+.

…

Reducing to WQXGA might be advised.