mmc_sd_mem.c

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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
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//_____  I N C L U D E S ___________________________________________________

#include "config.h"                         // system configuration
#include "conf_sdmmc.h"
#include "mmc_sd_mem.h"
#include "mmc_sd.h"

//_____ M A C R O S ________________________________________________________


//_____ P R I V A T E    D E C L A R A T I O N _____________________________


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


//extern xdata U32 mmc_sd_mem_size;
extern            xdata U32 MMC_SD_DISK_SIZE;
extern volatile   U32 mmc_sd_last_address;
extern            bit mmc_sd_init_done;

U8                mmc_sd_presence_status = 0;
extern            bit mmc_sd_init_done;



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

void mmc_sd_mem_init(void)
{
   mmc_sd_init();        // Init the SPI bus and the MMC/SD card
}


Ctrl_status mmc_sd_test_unit_ready(void)
{
  Sdmmc_access_signal_on();
  switch (mmc_sd_presence_status)
  {
    case MMCSD_REMOVED:
      mmc_sd_init_done = FALSE;
      if (OK == mmc_sd_mem_check())
      {
        mmc_sd_presence_status = MMCSD_INSERTED;
        Sdmmc_access_signal_off();
        return CTRL_BUSY;
      }
      Sdmmc_access_signal_off();
      return CTRL_NO_PRESENT;

    case MMCSD_INSERTED:
      if (OK != mmc_sd_mem_check())
      {
        mmc_sd_presence_status = MMCSD_REMOVING;
        mmc_sd_init_done = FALSE;
        Sdmmc_access_signal_off();
        return CTRL_BUSY;
      }
      Sdmmc_access_signal_off();
      return CTRL_GOOD;

    case MMCSD_REMOVING:
      mmc_sd_presence_status = MMCSD_REMOVED;
      Sdmmc_access_signal_off();
      return CTRL_NO_PRESENT;

    default:
      mmc_sd_presence_status = MMCSD_REMOVED;
      Sdmmc_access_signal_off();
      return CTRL_BUSY;
  }

  Sdmmc_access_signal_off();
  return CTRL_BUSY;
/*
  if (OK==mmc_sd_mem_check())
  {
    if (mmc_sd_status_changed == FALSE)
    {
      mmc_sd_status_changed = TRUE;
      return CTRL_BUSY;     // BUSY token must be returned to indicate a status change !
    }
    else
      return CTRL_GOOD;     // the 2nd time the host will ask for unit_ready, we can answer GOOD if we have returned BUSY first !
  }
  else
  {
    if (mmc_sd_status_changed == TRUE)
    {
      mmc_sd_status_changed = FALSE;
      return CTRL_BUSY;     // BUSY token must be returned to indicate a status change !
    }
    else
      return CTRL_NO_PRESENT;
  }
*/
}


Ctrl_status mmc_sd_read_capacity( U32 _MEM_TYPE_SLOW_ *u32_nb_sector )
{
//   mmc_sd_check_presence();   // ommited because creates interferences with "mmc_sd_test_unit_ready()" function
   Sdmmc_access_signal_on();
   if (mmc_sd_init_done == FALSE)
   {
      mmc_sd_mem_init();
   }
   if (mmc_sd_init_done == TRUE)
   {
     *u32_nb_sector = mmc_sd_last_block_address;
     Sdmmc_access_signal_off();
     return CTRL_GOOD;
   }
   else
   {
     Sdmmc_access_signal_off();
     return CTRL_NO_PRESENT;
   }
}


Bool  mmc_sd_wr_protect(void)
{
   return FALSE;
}


Bool  mmc_sd_removal(void)
{
  return FALSE;
//  return ((OK == mmc_sd_check_presence()) ? FALSE : TRUE);
}



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

Ctrl_status mmc_sd_read_10( U32 addr , U16 nb_sector )
{
bit status;
   if (mmc_sd_init_done == FALSE)
   {
      mmc_sd_mem_init();
   }
   if (mmc_sd_init_done == TRUE)
   {
     Sdmmc_access_signal_on();
     mmc_sd_read_open(addr);
     status = mmc_sd_read_sector(nb_sector);
     mmc_sd_read_close();
     Sdmmc_access_signal_off();
     if (status == OK)
        return CTRL_GOOD;
     else
        return CTRL_NO_PRESENT;
   }
   else
     return CTRL_NO_PRESENT;
}


Ctrl_status mmc_sd_write_10( U32 addr , U16 nb_sector )
{
  bit status;
   if (mmc_sd_init_done == FALSE)
   {
      mmc_sd_mem_init();
   }
   if (mmc_sd_init_done == TRUE)
   {
     Sdmmc_access_signal_on();
     mmc_sd_write_open(addr);
     status = mmc_sd_write_sector(nb_sector);
     mmc_sd_write_close();
     Sdmmc_access_signal_off();
     if (status == OK)
       return CTRL_GOOD;
     else
       return CTRL_NO_PRESENT;
   }
   else
     return CTRL_NO_PRESENT;
}


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

Ctrl_status    mmc_ram_2_mmc(U32 addr, U8 *ram)
{
#if (MMC_SD_RAM == ENABLE)
   Sdmmc_access_signal_on();
   mmc_sd_check_presence();
   if (mmc_sd_init_done == FALSE)
   {
      mmc_sd_mem_init();
   }

   if (mmc_sd_init_done == TRUE)
   {
     mmc_sd_write_open(addr);
     if (KO == mmc_sd_write_sector_from_ram(ram))
     {
       mmc_sd_write_close();
       Sdmmc_access_signal_off();
       return CTRL_NO_PRESENT;
     }
     mmc_sd_write_close();
     Sdmmc_access_signal_off();
     return CTRL_GOOD;
   }
   Sdmmc_access_signal_off();
#endif   // (MMC_SD_RAM == ENABLE)
     return CTRL_NO_PRESENT;
}

Ctrl_status    mmc_mmc_2_ram( U32 addr, U8 *ram)
{
#if (MMC_SD_RAM == ENABLE)
   Sdmmc_access_signal_on();
   mmc_sd_check_presence();
   if (mmc_sd_init_done == FALSE)
   {
      mmc_sd_mem_init();
   }

   if (mmc_sd_init_done == TRUE)
   {
     mmc_sd_read_open(addr);
     if (KO == mmc_sd_read_sector_to_ram(ram))
     {
       mmc_sd_write_close();
       Sdmmc_access_signal_off();
       return CTRL_NO_PRESENT;
     }
     mmc_sd_read_close();
     Sdmmc_access_signal_off();
     return CTRL_GOOD;
   }
   Sdmmc_access_signal_off();
#endif   // (MMC_SD_RAM == ENABLE)
   return CTRL_NO_PRESENT;
}

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