main.c

读SD卡

#include <stdio.h>
#include <sys/unistd.h>
#include <io.h>
#include <string.h>

#include "system.h"
#include "alt_types.h"
#include "altera_avalon_pio_regs.h"

#include "sdconfig.h"
#include "sdcmd.h"
#include "sdcrc.h"
#include "sddriver.h"
#include "sdhal.h"

/*****************************************/


int main(void)
{
  alt_u8 SDCBuff[SD_BLOCKSIZE];
  alt_u8 find_boot = 0;
  alt_u32 card_capacity;
  int i;
  printf("\nExp21 - SD Card Initiate and Read test!");
  
  if(SD_Initialize() == SD_NO_ERR)
	{
    printf("\nSD card initialize successfully!");
    printf("\nStart read SD card infomation now...");

		//读取卡的第启动扇区
    i = 0;
    do{
      if(SD_ReadBlock(i, SDCBuff) == SD_NO_ERR)    //打印分区表信息
      {
        if(SDCBuff[0] == 0xEB)
        {
          find_boot = 1;
          break;
        }
      }
    }
    while(i++ < 256);   //在前256个扇区中寻找起始扇区
   
    if(find_boot)    //打印分区表信息
    {
      printf("\nStart boot sector is: %d", i);
      printf("\nMaster bootstrap loader code (Hex):");
      for(i=0; i<SD_BLOCKSIZE; i++)
      {
        if(i % 16 == 0)
          printf("\n");
        printf("%02X ", SDCBuff[i]);
      }
      
      //打印分区表信息
      printf("\n===============================================");
      printf("\nJMP Insturction: %02X %02X %02X", SDCBuff[0], SDCBuff[1], SDCBuff[2]);
      printf("\nBytes/Sector: %d", SDCBuff[0x0c]*256+SDCBuff[0x0b]);
      printf("\nSectors/Cluster: %d", SDCBuff[0x0d]);
      printf("\nReserved Sectors: %d", SDCBuff[0x0f]*256+SDCBuff[0x0e]);
      printf("\nNumber of FATs: %d", SDCBuff[0x11]*256+SDCBuff[0x10]);
      card_capacity = (SDCBuff[0x23]<<24)|(SDCBuff[0x22]<<16)|(SDCBuff[0x21]<<8)|SDCBuff[0x20];
      printf("\nCard's Sectors: %u", card_capacity);
      printf("\nCard's Capacity: %u Bytes",card_capacity*SD_BLOCKSIZE);
      printf("\n... ...");
    }
    else
        printf("\nFind start boot sector fail!");
	}
  else
    printf("\nSD card initialize failed!");

	while(1);
	return 0;
}