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DM648 problem on calling memcpy

maoyang wu
Intellectual 615 points

Hi, everyone. In my program, there are two tasks(task1 and task2) and one global variable(unsigned char array[3][1920*1080]). In task1, we copy data from the video driver to the array[3][1920*1080], and the data in the array[3][1920*1080] is right. In task2, we copy data from array[3][190*1080] to a local variable(unsigned char array_local[3][1920*1080]) by calling the function memcpy()(memcpy(array_local,array,3*1920*1080)),However, some data in the array_local[3][1920*1080] is wrong. Besides, we use the loop to copy(for(i=0;i<=2;i++) for(j=0;j<=1920*1080-1;j++) array_local[i][j]=array[i][j];)),the result is same with that by calling memcpy(). what causes the failure of data copying, please help me.  Thank you.

  • 0
    TI__Mastermind 32475 points

    HI,

    You said that in Task2 you copy data from a global variable to a local variable.  Are you sure that you have enough stack for the local variable?
    How big is your Task2 stack because I wouldn't be surprise that the stack is overflowing.

    Ideally, you want to allocate memory from a heap for this instead of using a local variable and global variables.  Just my 2 cents.

    Judah

  • 0 in reply to judahvang
    Intellectual 615 points

    Thank you for you reply, Judah. the stacksize of task2 is 20*1024*1024. However, if the stacksize is bigger(for example 30*1024*1024), the program run wrong during BIOS_init, because we find the main() function cannot run.