How to use large array on DM648 with CCS3.3

maoyang wu

Hi, I've define a large array( unsigned char array[1024*1024*50]; ), and this array is a global variable. In the program, I use memset function to set the values

unsigned char *src;
unsigned char value=0x11;
src=(unsigned char *)(&array[0]);
for(i=0;i<=9;i++)
{
memset(src,value,1024*1024*5);
src+=1024*1024*5;
value+=0x11;
}

when we debug the program, and the results are: while i=0 and 1, the values in the array[] has changes and are same with the value variable, besides, another address in the heap has changed also,and its values is same, too. while i=2,3,4,5, 8 and 9,the values are normal, and only the array[] has changed. however, i=6 and 7, we can watch the value in the array[] isn't the value we assigned. what causes that and how to solve that, besides, what's the maxium length of an array? thank you!

by the way, the version of ccs is ccs3.3, and BIOS's version is 5.31.02

over 13 years ago

0 George Mock over 13 years ago

TI__Guru**** 244930 points

This C code is simple. Because of the memset call, the loop is not software pipelined. That means the generated code is simpler than usual. Thus, it is very unlikely there is some compiler bug here. Try this code out with a simulator in Code Composer Studio. Of course, be sure the simulator is properly configured to support a large amount of memory. My guess is that this will work fine on the simulator. If so, that means there is some sort of hardware problem. I'm no expert on hardware issues. But the first thing I would check is the configuration of the memory.

Thanks and regards,

-George

0 maoyang wu over 13 years ago in reply to George Mock

Intellectual 615 points

Thank, George. we'll try on the EVM board first, then on simulator.

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How to use large array on DM648 with CCS3.3