Using OV9655 camera by STM32F429 (DCMI)

[A319]

Good morning,

Yes true. I've fixed this. (I hope it's working)

File patch crt0_v7m.s

Code: Select all

Reset_Handler:
                /* Interrupts are globally masked initially.*/
                cpsid   i

                /* PSP stack pointers initialization.*/
                ldr     r0, =__process_stack_end__
                msr     PSP, r0

+                b LoopCopyDataInit1
+CopyDataInit1:
+                ldr  r3, =__ram4_start__
+                ldr  r3, [r3, r1]
+                str  r3, [r0, r1]
+                adds  r1, r1, #4
+LoopCopyDataInit1:
+                ldr  r0, =__ram4_start__
+                ldr  r3, =__ram4_end__
+                adds  r2, r0, r1
+                cmp  r2, r3
+                bcc CopyDataInit1

#if CRT0_INIT_FPU == TRUE
                /* FPU FPCCR initialization.*/
                movw    r0, #CRT0_FPCCR_INIT & 0xFFFF
                movt    r0, #CRT0_FPCCR_INIT >> 16
                movw    r1, #SCB_FPCCR & 0xFFFF
                movt    r1, #SCB_FPCCR >> 16
                str     r0, [r1]
                dsb
                isb

http://www.st.com/web/en/resource/techn ... 083249.pdf Page 20...21

But I wonder how the linker knows, that initialization code is missing in the startup section. The error still is still occurring.

Sven

[Giovanni]

Hi,

That code looks too complex, try using the same snippet that initializes the data segment.

Anyway, I am going to introduce a standard initialization/copy mechanism in startups soon™.

Giovanni

[mobyfab]

Giovanni,

That would be really cool, as there is a lot of memory types on modern MCUs (SDRAM, Quad SPI Flash, CCM...)

No more ninja startup/linker files

[A319]

Hi,

No more ninja startup/linker files

ROFL Actually I'm really impressed about the power of ChibiOS.

I'll wait for the CCM implementation. Hope this will happen very soon
Meanwhile I've added some descriptive informations on the Markdown file and added ChibiOS as a git submodule, so there's no need to do many changes in order to use this example.

https://github.com/DL7AD/STM32F429-DCMI

Sven