mem_task.c

来自「ATMEL全套MP3设计资料」· C语言 代码 · 共 608 行 · 第 1/2 页

      if (gl_mem_tick >= MEM_DELAY_TIME)
      { /* go to transfer state */
        func_state = mmc_setup_card(MMC_CARD2);
        if (func_state == MMC_ERROR)
        {
          mem_state = MEM_MMC2_ERROR;
        }
        else
        {
          if (func_state == MMC_END)        /* end of execution */
          {
            gl_memory = MEM_MMC;
            if (File_mount() == OK)         /* mount file system */
            {
              mem_state = MEM_MMC2_IDLE;
            }
            else
            {
              mem_state = MEM_MMC2_ERR_FMT; /* memory not formatted */
            }
            print_mem(SYMB_MMC2);           /* print MMC2 symbol */
          }
          gl_mem_tick = MEM_FUNCT_TIME;     /* init delay timer */
        }
      }
      break;
    }

    case MEM_MMC2_IDLE:
    {
      break;
    }

    case MEM_MMC1_ERROR:
    {
      if (mem_force_mmc)
      {
        mem_state = MEM_MMC1_INIT;
      }
      else
      {
        Mmc_disable();
        mem_state = MEM_MMC2_INIT;
      }
      break;
    }

    case MEM_MMC2_ERROR:
    {
      if (mem_force_mmc)
      {
        mem_state = MEM_MMC2_INIT;
      }
      else
      {
        Mmc_disable();
        mem_state = MEM_DF_INIT;
      }
      break;
    }

    case MEM_DF_ERR_FMT:
    {
      break;
    }

    case MEM_MMC1_ERR_FMT:
    {
      break;
    }

    case MEM_MMC2_ERR_FMT:
    {
      break;
    }
  }
}


/*F**************************************************************************
* NAME: mem_status
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*   memory status:  MEM_BUSY:   install in progress
*                   MEM_READY:  install done
*                   MEM_FORMAT: install done but memory not formated
*----------------------------------------------------------------------------
* PURPOSE: 
*   Return memory status
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
Byte mem_status (void)
{
  if ((mem_state == MEM_DF_IDLE) ||
      (mem_state == MEM_MMC1_IDLE) ||
      (mem_state == MEM_MMC2_IDLE))
  {
    return (MEM_READY);
  }
  if ((mem_state == MEM_DF_ERR_FMT) ||
      (mem_state == MEM_MMC1_ERR_FMT) ||
      (mem_state == MEM_MMC2_ERR_FMT))
  {
    return (MEM_FORMAT);
  }
  else
  {
    return (MEM_BUSY);
  }
}


/*F**************************************************************************
* NAME: mem_check_card
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*   OK: card present or on-board memory
*   KO: card not present
*----------------------------------------------------------------------------
* PURPOSE: 
*   Start card status checking
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit mem_check_card (void)
{
  switch (mem_state)
  {
    case MEM_MMC1_IDLE:
    case MEM_MMC1_ERR_FMT:
    {
      return (mmc_check_presence(MMC_CARD1));
    }

    case MEM_MMC2_IDLE:
    case MEM_MMC2_ERR_FMT:
    {
      return (mmc_check_presence(MMC_CARD2));
    }

    default:
    {
      return OK;
    }
  }
}


/*F**************************************************************************
* NAME: mem_card_select
*----------------------------------------------------------------------------
* PARAMS:
*   force:  - TRUE:  continue selecting MMC1 in case of error
*           - FALSE: select next device in case of error
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   Mass storage memory selection
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*   Call from mass storage routines:
*     - when Test_Unit returns not ready
*     - when exiting download mode for mounting new FAT
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void mem_card_select (bit force)
{
  mem_force_mmc = force;
  mem_state = MEM_MMC1_INIT;
}


/*F**************************************************************************
* NAME: mem_select_next
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   Select next on-board or card memory
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void mem_select_next (void)
{
  switch (mem_state)
  {
    case MEM_DF_IDLE:
    case MEM_DF_ERR_FMT:
    {
      mem_state = MEM_MMC1_INIT;
      break;
    }
    case MEM_MMC1_IDLE:
    case MEM_MMC1_ERR_FMT:
    {
      mem_state = MEM_MMC2_INIT;
      break;
    }
    case MEM_MMC2_IDLE:
    case MEM_MMC2_ERR_FMT:
    {
      mem_state = MEM_DF_INIT;
      break;
    }
  }
}


/*F**************************************************************************
* NAME: mem_select_format
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*   File system mount status
*----------------------------------------------------------------------------
* PURPOSE:
*   Re-mount memory after format or mass storage update 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit mem_select_format (void)
{
  gl_mem_tick = MEM_WRITE_TIME;

  switch (mem_state)
  {
    case MEM_DF_ERR_FMT:
    case MEM_DF_IDLE:
    {
      while (gl_mem_tick != MEM_TIME_OUT)
      {
        if (File_mount() == OK)             /* check if format ok */
        {
          mem_state = MEM_DF_IDLE;
          return OK;
        }
      }
      return KO;
    }

    case MEM_MMC1_ERR_FMT:
    case MEM_MMC1_IDLE:
    {
      while (gl_mem_tick != MEM_TIME_OUT)
      {
        if (File_mount() == OK)             /* check if format ok */
        {
          mem_state = MEM_MMC1_IDLE;
          return OK;
        }
      }
      return KO;
    }

    case MEM_MMC2_ERR_FMT:
    case MEM_MMC2_IDLE:
    {
      while (gl_mem_tick != MEM_TIME_OUT)
      {
        if (File_mount() == OK)             /* check if format ok */
        {
          mem_state = MEM_MMC2_IDLE;
          return OK;
        }
      }
      return KO;
    }

    default:
    {
      return KO;
    }
  }
}