mmcmain.c

LPC2148 SD读写源代码,这个程序实现了对 SD卡的读写操作

/*----------------------------------------------------------------------
www.mcu123.com
--------------------------------------------------------------------*/

#include <LPC214X.H>                     /* LPC214x definitions */

#include "type.h"
#include "spi_mmc.h"
#include "mmcmain.h"

extern BYTE MMCWRData[MMC_DATA_SIZE];
extern BYTE MMCRDData[MMC_DATA_SIZE];

/* Main Program */

int main (void) {
  DWORD i, BlockNum = 0;

  PINSEL1 = 0x40004000;
  IODIR1  = LED_MSK;                /* LED's defined as Outputs */

  SPI_Init();						/* initialize SPI for MMC card */
  IOSET1 = LED_CFG;
  if ( mmc_init() != 0 )//MMC 初始化
  {	
	IOSET0 = SPI_SEL;				/* set SSEL to high */
	while ( 1 );					/* Very bad happened */	
  }

  /* write, read back, and compare the complete 64KB on the MMC 
   * card each block is 512 bytes, the total is 512 * 128 */
  for ( BlockNum = 0; BlockNum < MAX_BLOCK_NUM; BlockNum++ )
  {
	IOCLR1 = LED_MSK;
	IOSET1 = LED_WR;
	if ( mmc_write_block(BlockNum) == 0 )
	{
	   IOCLR1 = LED_MSK;
	   IOSET1 = LED_RD;
	   mmc_read_block(BlockNum);
	}
	else
	{
       IOSET0 = SPI_SEL;					/* set SSEL to high */
  	   while ( 1 );							/* Very bad happened */
	}

	for ( i = 0; i < MMC_DATA_SIZE; i++ )	/* Validate */
	{
	  if ( MMCRDData[i] != MMCWRData[i] )
	  {
		IOSET0 = SPI_SEL;					/* set SSEL to high */
		while ( 1 );						/* Very bad happened */
	  }
	}
	for ( i = 0; i < MMC_DATA_SIZE; i++ )	/* clear read buffer */
		MMCRDData[i] = 0x00;
  }

  IOCLR1 = LED_MSK;
  IOSET1 = LED_DONE;
  while (1);                                /* Loop forever */

}