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/* ram_image.c by Steve Rhoads 11/7/05 
 * This program take the ram_xilinx.vhd file as input
 * and the code.txt file as input.
 * It then creates ram_image.vhd as output with the
 * initialization vectors set to the contents of code.txt.
 
 UPDATED: 09/07/10 Olivier Rinaudo (orinaudo@gmail.com)
 new behaviour: 8KB expandable to 64KB of internal RAM
 to be used with new ram_image.vhd enabling expandable 
 internal ram.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
//1MB buffer
#define BUF_SIZE (1024*1024)
//we have (up to) 8 blocks composed by 4 RAMB16_S9 instance (one per byte)
//each RAMB have 64 hex rows -> max=8*4*64
#define RAM_BLOCKS (8)
#define RAM_SPLIT (4)
#define RAM_ROWS (64)
#define RAM_ROWS_TOTAL (RAM_BLOCKS*RAM_SPLIT*RAM_ROWS)
#define RAM_DWORDPERROW (8)
 
 
int main(int argc, char *argv[])
{
   FILE *file;
   int i, iposinrow, iblock, irowinsplit, index, size, count;
   char *buf, *ptr, *ptr_list[RAM_ROWS_TOTAL], text[80];
   unsigned int *code;
 
   if(argc < 4)
   {
      printf("Usage: ram_image <in.vhd> <in_code.txt> <out.vhd>\n");
      printf("Usage: ram_image ram_xilinx.vhd code.txt ram_image.vhd\n");
      return 0;
   }
 
   buf = (char*)malloc(BUF_SIZE);
   code = (unsigned int*)malloc(BUF_SIZE);
 
   //Read ram_xilinx.vhd
   file = fopen(argv[1], "rb");
   if(file == NULL)
   {
      printf("Can't open '%s'!\n", argv[1]);
      return -1;
   }
   size = fread(buf, 1, BUF_SIZE, file);
   fclose(file);
 
   //Read code.txt
   file = fopen(argv[2], "r");
   if(file == NULL)
   {
      printf("Can't open '%s'!\n", argv[2]);
      return -1;
   }
   //store DWORDs in code buffer
   for(count = 0; count < RAM_ROWS_TOTAL*RAM_DWORDPERROW; ++count)
   {
      if(feof(file))
      {  
         count--;
         break;
      }   
      fscanf(file, "%x", &code[count]);
   }
   fclose(file);
 
   //Find 'INIT_00 => X"'
 
   //start at buf, then seek next occurence
   ptr = buf;
   for(i = 0; i < RAM_ROWS_TOTAL; ++i)
   {
      sprintf(text, "INIT_%2.2X => X\"", i % RAM_ROWS);
      ptr = strstr(ptr, text);
      if(ptr == NULL)
      {
         printf("ERROR: Can't find '%s', block %d, instance %d in '%s'!\n",
            text, (i/(RAM_SPLIT*RAM_ROWS)),
            (i%(RAM_SPLIT*RAM_ROWS))/RAM_ROWS, argv[1]);
         return -1;
      }
      ptr_list[i] = ptr + strlen(text);
   }
 
   //Modify vhdl source code
   iposinrow = RAM_DWORDPERROW*8-2; //start filling from end of line
   iblock = 0;
   irowinsplit = 0;
   for(i = 0; i < count; ++i)
   {
      sprintf(text, "%8.8x", code[i]);
      index = iblock*RAM_ROWS*RAM_SPLIT+irowinsplit; 
 
      ptr_list[index][iposinrow]              = text[0];
      ptr_list[index][iposinrow+1]            = text[1];
      ptr_list[index+RAM_ROWS][iposinrow]     = text[2];
      ptr_list[index+RAM_ROWS][iposinrow+1]   = text[3];
      ptr_list[index+RAM_ROWS*2][iposinrow]   = text[4];
      ptr_list[index+RAM_ROWS*2][iposinrow+1] = text[5];
      ptr_list[index+RAM_ROWS*3][iposinrow]   = text[6];
      ptr_list[index+RAM_ROWS*3][iposinrow+1] = text[7];
      iposinrow -= 2;
      if(iposinrow < 0)
      { 
        iposinrow = RAM_DWORDPERROW*8-2; //reset row
        irowinsplit++;
        if (irowinsplit>RAM_ROWS-1)
        { 
          irowinsplit = 0;
          iblock++;
        }
      } 
   }
 
   //Write ram_image.vhd
   file = fopen(argv[3], "wb");
   if(file == NULL)
   {
      printf("Can't write '%s'!\n", argv[3]);
      return -1;
   }
   fwrite(buf, 1, size, file);
   fclose(file);
   free(buf);
   free(code);
   return 0;
}