mci.CheckMedia

#include <file_config.h>

U32 CheckMedia  (             /* Optional, NULL if not existing */
    void);

The function CheckMedia checks the SD/MMC Memory Card status. It reads the Card Detect (CD) and Write Protect (WP) digital inputs. If CD and WP digital inputs from SD Card socket are not connected, this function can be omitted. In this case, enter NULL for CheckMedia into the MCI Driver control block.

The function is part of the MCI Driver. The prototype is defined in the file File_Config.h. Developers must customize the function.

The CheckMedia function returns the or-ed status of the following values:

• M_INSERTED
  SD Card is inserted in the socket.
• M_PROTECTED
  SD Card is read-only. Lock slider is in position Locked.

mci.BusMode, mci.BusSpeed, mci.BusWidth, mci.Command, mci.Delay, mci.Init, mci.ReadBlock, mci.SetDma, mci.UnInit, mci.WriteBlock

/* MCI Device Driver Control Block */
MCI_DRV mci0_drv = {
  Init,
  UnInit,
  Delay,
  BusMode,
  BusWidth,
  BusSpeed,
  Command,
  ReadBlock,
  WriteBlock,
  NULL,
  CheckMedia                              /* Can be NULL if not existing */
};

/* Read CardDetect and WriteProtect SD card socket pins. */
static U32 CheckMedia (void)  {
  U32 stat = 0;

  if (!(IOPIN0 & 0x04))  {
    stat |= M_INSERTED;                   /* Card is inserted (CD=0). */
  }
  if ((IOPIN0 & 0x20))  {
    stat |= M_PROTECTED;                  /* Write Protect switch is active (WP=1). */
  }
  return (stat);
}

/* MCI Device Driver Control Block with omitted CheckMedia */
MCI_DRV mci0_drv = {
  Init,
  UnInit,
  Delay,
  BusMode,
  BusWidth,
  BusSpeed,
  Command,
  ReadBlock,
  WriteBlock,
  NULL,
  NULL
};