df_mem.c

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//_____  I N C L U D E S ___________________________________________________

#include "config.h"                         // system configuration
#include "df_mem.h"
#include "df.h"

//_____ D E F I N I T I O N ________________________________________________

// Global value to manage the write protection on DataFlash
Bool g_b_df_protected = FALSE;
Bool g_b_df_protected_last = FALSE;

void  df_check_init( void );


//_____ D E C L A R A T I O N ______________________________________________


void df_mem_init(void)
{
   df_init();        // Init the DF driver and its communication link.
}


Ctrl_status df_test_unit_ready(void)
{
   if( g_b_df_protected != g_b_df_protected_last )
   {
      g_b_df_protected_last = g_b_df_protected;
      return CTRL_BUSY;
   }
   return( (OK==df_mem_check()) ? CTRL_GOOD : CTRL_NO_PRESENT);
}


Ctrl_status df_read_capacity( U32 _MEM_TYPE_SLOW_ *u32_nb_sector )
{
#ifdef DF_4_MB              // AT45DB321 memories
   *u32_nb_sector = ((DF_NB_MEM*4*1024L*1024L)/512)-1;
#endif
#ifdef DF_8_MB              // AT45DB642 memories
   *u32_nb_sector = ((DF_NB_MEM*8*1024L*1024L)/512)-1;
#endif
   return df_test_unit_ready();
}


Bool  df_wr_protect(void)
{
   return g_b_df_protected;
}


Bool  df_removal(void)
{
   return FALSE;
}



//------------ STANDARD FUNCTIONS to read/write the memory --------------------

Ctrl_status df_read_10( U32 addr , U16 nb_sector )
{
   U8 status = OK;
#if   (DF_NB_MEM == 1)     // 1 DATAFLASH
   df_read_open(addr);                    // wait device is not busy, then send command & address
   status = df_read_sector(nb_sector);             // transfer data from memory to USB
   
#else                      // 2 or 4 DATAFLASH
   U32   next_sector_addr = addr;
   U16   nb_sectors_remaining = nb_sector;
   
   #ifdef DF_4_MB             // 512B PAGES
   while( (nb_sectors_remaining != 0) && (status == OK))
   {
      df_read_open(next_sector_addr);     // wait device is not busy, then send command & address
      status = df_read_sector(1);                  // transfer the page from memory to USB
      df_read_close();
      nb_sectors_remaining--;
      next_sector_addr++;
   }
   #else                      // 1024B PAGES
   while( (nb_sectors_remaining != 0) && (status == OK))
   {
      df_read_open(next_sector_addr);     // wait device is not busy, then send command & address
      if ((LSB0(next_sector_addr)&0x01) == 0)
      {
        if (nb_sectors_remaining == 1)
        {
           status = df_read_sector(1);
           df_read_close();
           nb_sectors_remaining--;
           next_sector_addr++;
        }
        else
        {
          status = df_read_sector(2);
          df_read_close();
          nb_sectors_remaining -= 2;
          next_sector_addr += 2;
        }
      }
      else
      {
        status = df_read_sector(1);
        df_read_close();
        nb_sectors_remaining--;
        next_sector_addr++;
      }
   }
   #endif
#endif
   
   df_read_close();
   if(status == KO)
      return CTRL_FAIL;
   return CTRL_GOOD;
}


Ctrl_status df_write_10( U32 addr , U16 nb_sector )
{
#if   (DF_NB_MEM != 1)                 // if more than 1 memory, variables are needed for zones mangement
   U32   next_sector_addr = addr;
   U16   nb_sectors_remaining = nb_sector;
#endif

   if( g_b_df_protected ) return CTRL_FAIL;

#if      (DF_NB_MEM == 1)  /* 1 DATAFLASH */
   df_write_open(addr);                    // wait device is not busy, then send command & address
   if( KO == df_write_sector(nb_sector) )  // transfer data from memory to USB
   {
      df_mem_init();
      return CTRL_FAIL;
   }
#else                      /* 2 or 4 DATAFLASH */
   #ifdef DF_4_MB       // 512B PAGES
   while (nb_sectors_remaining != 0)
   {
      df_write_open(next_sector_addr);     // wait device is not busy, then send command & address
      if( KO == df_write_sector(1))        // transfer the page from memory to USB
      {
         df_mem_init();
         return CTRL_FAIL;
      }
      df_write_close();
      nb_sectors_remaining--;
      next_sector_addr++;
   }
   #else                // 1024B PAGES
   while (nb_sectors_remaining != 0)
   {
      df_write_open(next_sector_addr);     // wait device is not busy, then send command & address
      if ((LSB0(next_sector_addr)&0x01) == 0)
      {
        if (nb_sectors_remaining == 1)
        {
          if( KO == df_write_sector(1))    // transfer the page from memory to USB
          {
             df_mem_init();
             return CTRL_FAIL;
          }
          df_write_close();
          nb_sectors_remaining--;
          next_sector_addr++;
        }
        else
        {
          if( KO == df_write_sector(2))    // transfer the page from memory to USB
          {
             df_mem_init();
             return CTRL_FAIL;
          }
          df_write_close();
          nb_sectors_remaining -= 2;
          next_sector_addr += 2;
        }
      }
      else
      {
        if( KO == df_write_sector(1))      // transfer the page from memory to USB
        {
           df_mem_init();
           return CTRL_FAIL;
        }
        df_write_close();
        nb_sectors_remaining--;
        next_sector_addr++;
      }
   }
   #endif
#endif
   df_write_close();                    // unselect memory
   return CTRL_GOOD;
}


//------------ Standard functions for read/write 1 sector to 1 sector ram buffer -----------------


Ctrl_status    df_df_2_ram( U32 addr, U8 *ram)
{
   df_read_open(addr);
   df_read_sector_2_ram(ram);
   df_read_close();
   return CTRL_GOOD;
}


Ctrl_status    df_ram_2_df(U32 addr, U8 *ram)
{
   df_write_open(addr);
   df_write_sector_from_ram(ram);
   df_write_close();
   return CTRL_GOOD;
}

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