Reader Class Reference

#include <sdcard.h>

Public Member Functions
int	openfile (const char *filename)
void	begin (dirent &de)
void	nextcluster ()
void	skipcluster ()
void	skipsector ()
void	seek (uint32_t o)
void	readsector ()
void	readsector (byte *dst)

Data Fields
sdcard	SD
uint32_t	cluster
uint32_t	offset
uint32_t	size
byte	sector

Detailed Description

Definition at line 302 of file sdcard.h.

Member Function Documentation

begin()

void Reader::begin ( dirent &  de )

inline

Definition at line 323 of file sdcard.h.

                         {
    size = de.size;
    cluster = de.cluster;
    if (SD.type == FAT32)
      cluster |= ((long)de.cluster_hi << 16);
    sector = 0;
    offset = 0;
  }

nextcluster()

void Reader::nextcluster ( )

inline

Definition at line 331 of file sdcard.h.

                     {
    if (SD.type == FAT16)
      cluster = SD.rd2(SD.o_fat + 2 * cluster);
    else
      cluster = SD.rd4(SD.o_fat + 4 * cluster);
#if VERBOSE
    Serial.print("nextcluster=");
    Serial.println(cluster, DEC);
#endif
  }

openfile()

int Reader::openfile ( const char *  filename )

inline

Definition at line 305 of file sdcard.h.

                                       {
    int i = 0;
    byte dosname[11];
    dirent de;
 
    dos83(dosname, filename);
    do {
      SD.rdn((byte*)&de, SD.o_root + i * 32, sizeof(de));
      // Serial.println(de.name);
      if (0 == memcmp(de.name, dosname, 11)) {
        begin(de);
        return 1;
      }
      i++;
    } while (de.name[0]);
    return 0;
  }

readsector() [1/2]

void Reader::readsector ( )

inline

Definition at line 361 of file sdcard.h.

                    {
    if (sector == SD.sectors_per_cluster) {
      sector = 0;
      nextcluster();
    }
    uint32_t off = SD.o_data + ((long)SD.cluster_size * cluster) + (512L * sector);
#if VERBOSE
    Serial.print("off=0x");
    Serial.println(off, HEX);
#endif
    SD.cmd17(off & ~511L);
// Serial.println(2 * (micros() - t0), DEC);
    sector++;
    offset += 512;
  }

readsector() [2/2]

void Reader::readsector ( byte *  dst )

inline

Definition at line 376 of file sdcard.h.

                             {
    readsector();
    for (int i = 0; i < 64; i++) {
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
      *dst++ = SPI.transfer(0xff);
    }
    SPI.transfer(0xff);   // consume CRC
    SPI.transfer(0xff);
    SD.desel();
  }

seek()

void Reader::seek ( uint32_t  o )

inline

Definition at line 353 of file sdcard.h.

                        {
    while (offset < o) {
      if ((sector == SD.sectors_per_cluster) && ((o - offset) > (long)SD.cluster_size))
        skipcluster();
      else
        skipsector();
    }
  }

skipcluster()

void Reader::skipcluster ( )

inline

Definition at line 341 of file sdcard.h.

                     {
    nextcluster();
    offset += SD.cluster_size;
  }

skipsector()

void Reader::skipsector ( )

inline

Definition at line 345 of file sdcard.h.

                    {
    if (sector == SD.sectors_per_cluster) {
      sector = 0;
      nextcluster();
    }
    sector++;
    offset += 512;
  }

Field Documentation

cluster

uint32_t Reader::cluster

Definition at line 392 of file sdcard.h.

offset

uint32_t Reader::offset

Definition at line 393 of file sdcard.h.

SD

sdcard Reader::SD

Definition at line 304 of file sdcard.h.

sector

byte Reader::sector

Definition at line 395 of file sdcard.h.

size

uint32_t Reader::size

Definition at line 394 of file sdcard.h.

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The documentation for this class was generated from the following file:

• D:/eclipse-workspace/BridgeTek/EveApps/EveApps/common/application/Arduino/sdcard.h