Bare-metal app: copy big data from memory to array

thuanpham — Thu, 11 Apr 2013 13:26:10 GMT

Hello,

I have an image buffer in the memory and I want to read each frame at one time by using memcpy to copy from memory to an 3 dimensions array with size 82x62x3 but the program stuck at the call of memcpy function.

Here is my code:

Int8U buf[82][62][3];

memcpy(buf, (Int8U *)IMAGE_BUFFER_BASE_ADDRESS, IMAGE_FRAME_SIZE);

(where IMAGE_FRAME_SIZE=82x62x3=15252 bytes)

Could you give me any suggestion?

Thank you.

Re: Bare-metal app: copy big data from memory to array

ioseph_martinez — Wed, 12 Jun 2013 14:05:37 GMT

Hello,

Probably you already got it solved but let me shoot some ideas:

First, is IMAGE_BUFFER_BASE_ADDRESS a valid address? was this allocated somewhere? have access through MMU, have you tried accessing (read/write) with the CPU?

Secondly: memcpy with CPU is very simple, you can do it your own to debug more easily:

int8U ptr1;ptr2;

ptr1 = buf;

ptr2= IMAGE_BUFFER_BASE_ADDRESS;

for(i=0; i<IMAGE_FRAME_SIZE; i++)

{

ptr1[i] = ptr2[i];

}

Run the code above and check where it fails... if it fails at the begining, is very likely your memory is not being correctly allocated or addressed (ie. IMAGE_BUFFER_BASE_ADDRESS is invalid address)

topic Re: Bare-metal app: copy big data from memory to array in i.MX Processors

Bare-metal app: copy big data from memory to array

Re: Bare-metal app: copy big data from memory to array