LPC Microcontrollers中的主题 Re: Sgpio camera error

Sgpio camera error

dimitrissideris — Tue, 07 Feb 2017 13:34:23 GMT

Hi there,

I am trying to get a camera work at my custom PCB.

The uC is 4367 and the camera is OV7670.

I followed the example from here:

AN11343: SGPIO camera module design using LPC4300 | www.LPCware.com

This example works in dual core M0 and M4.

I changed the code according to my needs and used only M4.

Is there any problem with that whatosoever?

I dont think so because there is also an example with one core setup

AN11196: Camera interface design using SGPIO | www.LPCware.com

Currently i am under heavy development and in a state that i migrated the code from example 11343 to my code and this error occurs.

arm-none-eabi-gcc -nostdlib -L"C:\Users\d.sideris\Desktop\LPC_workspace\LpcOpen\lpc_chip_43xx\Debug" -L"C:\Users\d.sideris\Desktop\LPC_workspace\LpcOpen\lpc_board_nxp_lpcxpresso_4337\Debug" -Xlinker -Map="periph_sgpio_camera.map" -Xlinker --gc-sections -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -mthumb -T "periph_uart_Debug.ld" -o "periph_sgpio_camera.axf" ./example/src/cr_startup_lpc43xx.o ./example/src/ov7670.o ./example/src/sgpio_camera.o ./example/src/sysinit.o -llpc_board_nxp_lpcxpresso_4337 -llpc_chip_43xx

c:/nxp/lpcxpresso_8.1.4_606/lpcxpresso/tools/bin/../lib/gcc/arm-none-eabi/5.2.1/../../../../arm-none-eabi/bin/ld.exe: periph_sgpio_camera.axf section `.bss' will not fit in region `RamLoc32'

c:/nxp/lpcxpresso_8.1.4_606/lpcxpresso/tools/bin/../lib/gcc/arm-none-eabi/5.2.1/../../../../arm-none-eabi/bin/ld.exe: region `RamLoc32' overflowed by 275540 bytes

collect2.exe: error: ld returned 1 exit status

make: *** [periph_sgpio_camera.axf] Error 1

I ve searched and read about ramloc32 ovlerflow but i didnt quite understand what i have to do to solve this.

So please I would very like some help!

The 11343 was migrated to the periph_uart lpcopen example because projects goal is to transfer camera data through uart.

So I read that default lpcopen projects have "little memory" occupied. I dont know if this is valid. How can i check and configure what memory is occupied?

Re: Sgpio camera error

dimitrissideris — Wed, 08 Feb 2017 09:06:28 GMT

any help please?

Re: Sgpio camera error

converse — Wed, 08 Feb 2017 09:25:23 GMT

The error means that your application is too large to fit into the available memory - by 275k! It is trying to load it into the 32k SRAM region of memory.

The error indicates that it is caused by the .bss section, which is for zero-initialised data, so I would guess that you have defined a very big array in your code.

Re: Sgpio camera error

dimitrissideris — Wed, 08 Feb 2017 11:17:53 GMT

i can't find anything like a big array.

Any other clue?

Re: Sgpio camera error

dimitrissideris — Wed, 08 Feb 2017 11:35:11 GMT

When i code an uninitialized array which is too big, compilers generates:

error: size of array 'ridiculously_long_variable' is too large

Re: Sgpio camera error

converse — Wed, 08 Feb 2017 13:24:03 GMT

There is something causing you code to be 275k too large. If you can't find it, attach you project and I'll take a look for you.

Re: Sgpio camera error

dimitrissideris — Fri, 10 Feb 2017 09:19:08 GMT

Really? That would be very helpful!

Sorry for the delayed answer. I had to be off desk for a couple of days.

check example/src

Re: Sgpio camera error

converse — Fri, 10 Feb 2017 15:48:50 GMT

Well, it didn't take long to find...

The large array is:

US_RcvBuf g_rcvDbBuf;

US_RcvBuf is a union, that is 320x240x2x2 - 300k. (307200 bytes)

You are going to struggle to fit that into a 32k memory region. The largest block of contiguous RAM on this part if 40k.

Re: Sgpio camera error

dimitrissideris — Mon, 13 Feb 2017 09:05:40 GMT

Thanx a lot for the help!

So, if i would like to handle camera how would i do that if ram can handle only 40k max?

Can you please take a look here? This is the application note of what i am trying to do. I use this code as my basecode so that i can adjust it to my needs.

AN11343: SGPIO camera module design using LPC4300 | www.LPCware.com

Thanx a lot in advance!

Re: Sgpio camera error

converse — Mon, 13 Feb 2017 09:37:06 GMT

I don't know the application (and I do not want to), but the MCB4300 has a lot of external memory connected to the LPC4357 (16MB NOR Flash, 4MB Quad-SPI Flash, 16 MB SDRAM). I guess that is what the AN is using. So, if you want to have a large frame buffer, presumably you are going to need to do the same and connect an external memory device to your MCU, using the EMC.

Good luck with your project.

Re: Sgpio camera error

dimitrissideris — Mon, 13 Feb 2017 09:42:32 GMT

Thanx for the help.