mmc_sd_mem.c File Reference

#include "config.h"
#include "conf_sdmmc.h"
#include "mmc_sd_mem.h"
#include "mmc_sd.h"

Include dependency graph for mmc_sd_mem.c:

Go to the source code of this file.

Functions

void mmc_sd_mem_init (void)
Ctrl_status mmc_sd_test_unit_ready (void)
Ctrl_status mmc_sd_read_capacity (U32 _MEM_TYPE_SLOW_ *u32_nb_sector)
Bool mmc_sd_wr_protect (void)
Bool mmc_sd_removal (void)
Ctrl_status mmc_sd_read_10 (U32 addr, U16 nb_sector)
Ctrl_status mmc_sd_write_10 (U32 addr, U16 nb_sector)
 This fonction initialise the memory for a write operation.
Ctrl_status mmc_ram_2_mmc (U32 addr, U8 *ram)
 This fonction initialise the memory for a write operation from ram buffer to MMC/SD (1 sector).
Ctrl_status mmc_mmc_2_ram (U32 addr, U8 *ram)
 This fonction read 1 sector from MMC/SD to ram buffer.

Variables

xdata U32 MMC_SD_DISK_SIZE
volatile U32 mmc_sd_last_address
bit mmc_sd_init_done
U8 mmc_sd_presence_status = 0
bit mmc_sd_init_done

Detailed Description

This file contains the interface routines of Data Flash memory.

Author:
Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file mmc_sd_mem.c.

Function Documentation

void mmc_sd_mem_init ( void   ) 

This function initializes the hw/sw ressources required to drive the MMC_SD.

Warning:
Code:?? bytes (function code length)
Parameters:
none 
Returns:
none
/

Definition at line 79 of file mmc_sd_mem.c.

Referenced by mmc_mmc_2_ram(), mmc_ram_2_mmc(), mmc_sd_read_10(), mmc_sd_read_capacity(), and mmc_sd_write_10().

00080 {
00081    mmc_sd_init();        // Init the SPI bus and the MMC/SD card
00082 }

Here is the caller graph for this function:

Ctrl_status mmc_sd_test_unit_ready ( void   ) 

This function tests the state of the MMC_SD memory and sends it to the Host. For a PC, this device is seen as a removable media Before indicating any modification of the status of the media (GOOD->NO_PRESENT or vice-versa), the function must return the BUSY data to make the PC accepting the change

Warning:
Code:?? bytes (function code length)
Parameters:
none 
Returns:
Ctrl_status Media is ready -> CTRL_GOOD Media not present -> CTRL_NO_PRESENT Media has changed -> CTRL_BUSY /

Definition at line 100 of file mmc_sd_mem.c.

00101 {
00102   Sdmmc_access_signal_on();
00103   switch (mmc_sd_presence_status)
00104   {
00105     case MMCSD_REMOVED:
00106       mmc_sd_init_done = FALSE;
00107       if (OK == mmc_sd_mem_check())
00108       {
00109         mmc_sd_presence_status = MMCSD_INSERTED;
00110         Sdmmc_access_signal_off();
00111         return CTRL_BUSY;
00112       }
00113       Sdmmc_access_signal_off();
00114       return CTRL_NO_PRESENT;
00115 
00116     case MMCSD_INSERTED:
00117       if (OK != mmc_sd_mem_check())
00118       {
00119         mmc_sd_presence_status = MMCSD_REMOVING;
00120         mmc_sd_init_done = FALSE;
00121         Sdmmc_access_signal_off();
00122         return CTRL_BUSY;
00123       }
00124       Sdmmc_access_signal_off();
00125       return CTRL_GOOD;
00126 
00127     case MMCSD_REMOVING:
00128       mmc_sd_presence_status = MMCSD_REMOVED;
00129       Sdmmc_access_signal_off();
00130       return CTRL_NO_PRESENT;
00131 
00132     default:
00133       mmc_sd_presence_status = MMCSD_REMOVED;
00134       Sdmmc_access_signal_off();
00135       return CTRL_BUSY;
00136   }
00137 
00138   Sdmmc_access_signal_off();
00139   return CTRL_BUSY;
00140 /*
00141   if (OK==mmc_sd_mem_check())
00142   {
00143     if (mmc_sd_status_changed == FALSE)
00144     {
00145       mmc_sd_status_changed = TRUE;
00146       return CTRL_BUSY;     // BUSY token must be returned to indicate a status change !
00147     }
00148     else
00149       return CTRL_GOOD;     // the 2nd time the host will ask for unit_ready, we can answer GOOD if we have returned BUSY first !
00150   }
00151   else
00152   {
00153     if (mmc_sd_status_changed == TRUE)
00154     {
00155       mmc_sd_status_changed = FALSE;
00156       return CTRL_BUSY;     // BUSY token must be returned to indicate a status change !
00157     }
00158     else
00159       return CTRL_NO_PRESENT;
00160   }
00161 */
00162 }

Ctrl_status mmc_sd_read_capacity ( U32 _MEM_TYPE_SLOW_ *  u32_nb_sector  ) 

This function gives the address of the last valid sector.

Warning:
Code:?? bytes (function code length)
Parameters:
*u32_nb_sector number of sector (sector = 512B). OUT
Returns:
Ctrl_status Media ready -> CTRL_GOOD Media not present -> CTRL_NO_PRESENT /

Definition at line 176 of file mmc_sd_mem.c.

00177 {
00178 //   mmc_sd_check_presence();   // ommited because creates interferences with "mmc_sd_test_unit_ready()" function
00179    Sdmmc_access_signal_on();
00180    if (mmc_sd_init_done == FALSE)
00181    {
00182       mmc_sd_mem_init();
00183    }
00184    if (mmc_sd_init_done == TRUE)
00185    {
00186      *u32_nb_sector = mmc_sd_last_block_address;
00187      Sdmmc_access_signal_off();
00188      return CTRL_GOOD;
00189    }
00190    else
00191    {
00192      Sdmmc_access_signal_off();
00193      return CTRL_NO_PRESENT;
00194    }
00195 }

Bool mmc_sd_wr_protect ( void   ) 

This function returns the write protected status of the memory.

Only used by memory removal with a HARDWARE SPECIFIC write protected detection !!! The customer must unplug the memory to change this write protected status, which cannot be for a MMC_SD.

Warning:
Code:?? bytes (function code length)
Returns:
FALSE -> the memory is not write-protected (always) /

Definition at line 209 of file mmc_sd_mem.c.

00210 {
00211    return FALSE;
00212 }

Bool mmc_sd_removal ( void   ) 

This function tells if the memory has been removed or not.

Parameters:
none 
Warning:
Code:?? bytes (function code length)
Returns:
FALSE -> The memory isn't removed /

Definition at line 224 of file mmc_sd_mem.c.

00225 {
00226   return FALSE;
00227 //  return ((OK == mmc_sd_check_presence()) ? FALSE : TRUE);
00228 }

Ctrl_status mmc_sd_read_10 ( U32  addr,
U16  nb_sector 
)

This function performs a read operation of n sectors from a given address on. (sector = 512B)

DATA FLOW is: MMC_SD => USB

Warning:
Code:?? bytes (function code length)
Parameters:
addr Sector address to start the read from
nb_sector Number of sectors to transfer
Returns:
Ctrl_status It is ready -> CTRL_GOOD A error occur -> CTRL_FAIL

Definition at line 250 of file mmc_sd_mem.c.

00251 {
00252 bit status;
00253    if (mmc_sd_init_done == FALSE)
00254    {
00255       mmc_sd_mem_init();
00256    }
00257    if (mmc_sd_init_done == TRUE)
00258    {
00259      Sdmmc_access_signal_on();
00260      mmc_sd_read_open(addr);
00261      status = mmc_sd_read_sector(nb_sector);
00262      mmc_sd_read_close();
00263      Sdmmc_access_signal_off();
00264      if (status == OK)
00265         return CTRL_GOOD;
00266      else
00267         return CTRL_NO_PRESENT;
00268    }
00269    else
00270      return CTRL_NO_PRESENT;
00271 }

Ctrl_status mmc_sd_write_10 ( U32  addr,
U16  nb_sector 
)

This fonction initialise the memory for a write operation.

DATA FLOW is: USB => MMC_SD

(sector = 512B)

Parameters:
addr Sector address to start write
nb_sector Number of sectors to transfer
Returns:
Ctrl_status It is ready -> CTRL_GOOD A error occur -> CTRL_FAIL

Definition at line 287 of file mmc_sd_mem.c.

00288 {
00289   bit status;
00290    if (mmc_sd_init_done == FALSE)
00291    {
00292       mmc_sd_mem_init();
00293    }
00294    if (mmc_sd_init_done == TRUE)
00295    {
00296      Sdmmc_access_signal_on();
00297      mmc_sd_write_open(addr);
00298      status = mmc_sd_write_sector(nb_sector);
00299      mmc_sd_write_close();
00300      Sdmmc_access_signal_off();
00301      if (status == OK)
00302        return CTRL_GOOD;
00303      else
00304        return CTRL_NO_PRESENT;
00305    }
00306    else
00307      return CTRL_NO_PRESENT;
00308 }

Ctrl_status mmc_ram_2_mmc ( U32  addr,
U8 *  ram 
)

This fonction initialise the memory for a write operation from ram buffer to MMC/SD (1 sector).

DATA FLOW is: RAM => MMC

(sector = 512B)

Parameters:
addr Sector address to write
ram Ram buffer pointer
Returns:
Ctrl_status It is ready -> CTRL_GOOD A error occur -> CTRL_FAIL

Definition at line 326 of file mmc_sd_mem.c.

00327 {
00328 #if (MMC_SD_RAM == ENABLE)
00329    Sdmmc_access_signal_on();
00330    mmc_sd_check_presence();
00331    if (mmc_sd_init_done == FALSE)
00332    {
00333       mmc_sd_mem_init();
00334    }
00335 
00336    if (mmc_sd_init_done == TRUE)
00337    {
00338      mmc_sd_write_open(addr);
00339      if (KO == mmc_sd_write_sector_from_ram(ram))
00340      {
00341        mmc_sd_write_close();
00342        Sdmmc_access_signal_off();
00343        return CTRL_NO_PRESENT;
00344      }
00345      mmc_sd_write_close();
00346      Sdmmc_access_signal_off();
00347      return CTRL_GOOD;
00348    }
00349    Sdmmc_access_signal_off();
00350 #endif   // (MMC_SD_RAM == ENABLE)
00351      return CTRL_NO_PRESENT;
00352 }

Ctrl_status mmc_mmc_2_ram ( U32  addr,
U8 *  ram 
)

This fonction read 1 sector from MMC/SD to ram buffer.

DATA FLOW is: MMC => RAM

(sector = 512B)

Parameters:
addr Sector address to read
ram Ram buffer pointer
Returns:
Ctrl_status It is ready -> CTRL_GOOD A error occur -> CTRL_FAIL

Definition at line 366 of file mmc_sd_mem.c.

00367 {
00368 #if (MMC_SD_RAM == ENABLE)
00369    Sdmmc_access_signal_on();
00370    mmc_sd_check_presence();
00371    if (mmc_sd_init_done == FALSE)
00372    {
00373       mmc_sd_mem_init();
00374    }
00375 
00376    if (mmc_sd_init_done == TRUE)
00377    {
00378      mmc_sd_read_open(addr);
00379      if (KO == mmc_sd_read_sector_to_ram(ram))
00380      {
00381        mmc_sd_write_close();
00382        Sdmmc_access_signal_off();
00383        return CTRL_NO_PRESENT;
00384      }
00385      mmc_sd_read_close();
00386      Sdmmc_access_signal_off();
00387      return CTRL_GOOD;
00388    }
00389    Sdmmc_access_signal_off();
00390 #endif   // (MMC_SD_RAM == ENABLE)
00391    return CTRL_NO_PRESENT;
00392 }

Variable Documentation

xdata U32 MMC_SD_DISK_SIZE

volatile U32 mmc_sd_last_address

bit mmc_sd_init_done

Definition at line 54 of file mmc_sd.c.

U8 mmc_sd_presence_status = 0

Definition at line 62 of file mmc_sd_mem.c.

Referenced by mmc_sd_test_unit_ready().

bit mmc_sd_init_done

Definition at line 54 of file mmc_sd.c.

Generated on Fri Oct 31 14:31:31 2008 for ATMEL by  doxygen 1.5.3