Hi,
I am working on MCB2300 (with LPC2378 processor). I have written a small function that will read the values into a matrix. But when the control comes to fread it completely hangs up, nothing can be done. Below is the my function which is giving problem
void loadImage(FILE* arq, unsigned char** Matrix){ int i,j; unsigned char tmp; long pos = 51; fseek(arq,0,0); for (i=0; i<300; i++){ for (j=0; j<400; j++){ pos+= 3; fseek(arq,pos,0); fread(&tmp,3,1,arq); Matrix[i][j] = tmp; } } }
Its working fine in GNU C. But when I have tried to use the same code in Keil uVision4, its is not working. Please let me know how to sort this problem
Again, that's meaningless!
You need to state precisely what did happen - and why you consider that to be "not working"!
What, exactly, failed?
How did it fail?
What debugging have you done to find the cause of the failure?
I have already tried previously by allocating one big chunk of memory for a three-dimensionsl array:
unsigned char bitmap[height][width][3]
So it's actually 320 x 240 x3 = 675K
I have defined a matrix like below
unsigned char bitmap[320][240]
After that I allocated the some elements into that matrix before reading pixel values to make sure whether all elements in the matrix are initialised in the following manner
for (i=0;i<320;i++){ for (j=0;i<240;j++){ bitmap[i][j]=j; } }
After this I am trying to print the values read in to the matrix using printf statement inthe following manner
for (i=0;i<320;i++){ for (j=0;i<240;j++){ printf(" %d ", bitmap[i][j]); } }
Once done I have compiled it. Compilation is done but I could n't run it. Nothing is printed
You keep ignoring my suggestions. What's the point in posting about your problems when you ignore the responses? How much RAM do you have? Do you have enough of it to hold your bitmap? If you define a variable at function scope (a so-called automatic variable), memory for it will be allocated on the stack. I am certain that your stack is not large enough to hold a variable that is 75 Kbytes in size. Hence, the program will not work.
My default heap size in startup file is Heap_Size EQU 0x00000800.
I have increased the heap size step by step and tested on images with different sizes. When I have set the heap size to 0x 00007000 , the final image that worked is of size 26.3 KB (109 x 82 x 3). But if I change heap value further it is not working. But my required image size is much larger. What things I need to do so that I can change heap value further and ensure it works with large images?
My IRAM1 settings are default (IRAM1: 0x40000000 Size: 0x8000)
OK, this is the 3rd time I'm asking this: how much RAM do you have? This is important for your application, as you should have realized by now. You indicated that you have 32 Kbytes of RAM. Obviously, this is too little.
In fact, you seem to ignore all responses from all posters!
"Compilation is done but I could n't run it"
There you go again - a meaningless statement!
Why couldn't you run it?
What, exactly, prevented you from running it?
What debugging have you done to find the problem?
Stop fooling around. 320*200*3 = 64000*3.
The processor don't have enough internal RAM to handle it.
The processor doesn't even have RAM memory regions that are neighbour to each other to allow a single memory allocation of the full size, since the 64kB of main RAM is not neighbour to USB or Ethernet RAM or to the two 64kB external memory banks. And the two 64kB external memory banks are not neighbour either.
Do you have external RAM connected? How much? If yes - how have you convinced the RTL to place 128kB heap in external RAM and 64kB heap in internal RAM?