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Trying to get RL-FlashFS working on LPC2300

Perdrix

I'm building some code to read the SD Card on an MCB2300.   I'm using the RL-FlashFS library.

I have configured CCLK to 48MHZ and PCLK_MCI to CCLK, and changed the #defines in MCI_LPC23xx.c to read:

#define __MCLK    48000000
#define __CPUCLK  48000000

My code to initialise the card reads:

	uint32_t retv = finit(NULL);

The SD LED on the MCB2300 board comes on when the call is made and then there's a *long* pause and eventually the function returns a value of 2.

I'm using 4.74 of the library and uVision 5

Help please, I am totally baffled.

Thanks, David

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  • 0

    The code is busy waiting in the ReadBlock function in source file MCI_LPC23xx.c:

    static BOOL ReadBlock (U32 bl, U8 *buf, U32 cnt) {
  /* Read one or more 512 byte blocks from Flash Card. */
  U32 i;

  /* Set MCI Transfer registers. */
  MCI_DATA_TMR  = DATA_RD_TOUT_VALUE;
  MCI_DATA_LEN  = cnt * 512;

  /* Start DMA Peripheral to Memory transfer. */
  DmaStart (DMA_READ, buf);
  MCI_DATA_CTRL = 0x9B;

  for (i = DMA_TOUT; i; i--) {
    if (GPDMA_RAW_INT_TCSTAT & 0x01) {
      /* Data transfer finished. */
      return (__TRUE);
    }
  }
  /* DMA Transfer timeout. */
  return (__FALSE);
}

    After 10M iterations it gives up and returns FALSE.

    Surely I'm not the first to hit this issue?

    D.

Reply
  • 0

    The code is busy waiting in the ReadBlock function in source file MCI_LPC23xx.c:

    static BOOL ReadBlock (U32 bl, U8 *buf, U32 cnt) {
  /* Read one or more 512 byte blocks from Flash Card. */
  U32 i;

  /* Set MCI Transfer registers. */
  MCI_DATA_TMR  = DATA_RD_TOUT_VALUE;
  MCI_DATA_LEN  = cnt * 512;

  /* Start DMA Peripheral to Memory transfer. */
  DmaStart (DMA_READ, buf);
  MCI_DATA_CTRL = 0x9B;

  for (i = DMA_TOUT; i; i--) {
    if (GPDMA_RAW_INT_TCSTAT & 0x01) {
      /* Data transfer finished. */
      return (__TRUE);
    }
  }
  /* DMA Transfer timeout. */
  return (__FALSE);
}

    After 10M iterations it gives up and returns FALSE.

    Surely I'm not the first to hit this issue?

    D.

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