mci.BusWidth

#include <file_config.h>

BOOL BusWidth  (
     U32 width);       /* SD/MMC Bus width */

The function BusWidth sets the bus width of the MCI interface.

The parameter width specifies the bus mode:

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

• If the 4-bit bus width mode is not supported in hardware, this function must fail for the width value of 4. The system will then use 1-bit bus width mode.

• __TRUE - on success.
• __FALSE - on failure.

mci.BusMode, mci.BusSpeed, mci.CheckMedia, 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 */
};

/* Set MCI Bus width. */
static BOOL BusWidth (U32 width) {

  switch (width) {
    case 1:
      MCI_CLOCK &= ~0x0800;
      return (__TRUE);

    case 4:
      MCI_CLOCK |= 0x0800;
      return (__TRUE);
  }
  return (__FALSE);
}