I have a double data type pointer and size is about 512KB. I am trying to copy the data present in double data type pointer to char array.

My code looks as shown below:

double *DDR = (double *)0x90000000;
char array[524288];

How to copy the data present in DDR pointer to char array.

CodePudding user response：

Unless special restrictions apply to the memory area referred to by the absolute address 0x90000000, you can just use memcpy:

#include <string.h>

   ...
   double *DDR = (double *)0x90000000;
   char array[524288];
   memcpy(array, DDR, sizeof(array));
   ...

Alternately, you can use a loop:

   double *DDR = (double *)0x90000000;
   char array[524288];
   double *dp = (double *)array;
   for (size_t i = 0; i < sizeof array / sizeof double; i  ) {
       dp[i] = DDR[i];
   }

The compiler might actually generate the same code for both approaches.