sdfat - fgets

hello there  ,

looking @ sample sdfat fgets, there way of altering (with button attached pin 8 when goes high, pressed) show next line, example loads lines in 1 go.

code: [select]

// demo of fgets function read lines file.
#include <spi.h>
#include <sdfat.h>

// sd chip select pin
const uint8_t chipselect = ss;

sdfat sd;
// print stream
arduinooutstream cout(serial);
//------------------------------------------------------------------------------
// store error strings in flash memory
#define error(s) sd.errorhalt(f(s))
//------------------------------------------------------------------------------
void demofgets() {
  char line[25];
  int n;
  // open test file
  sdfile rdfile("fgets.txt", o_read);

  // check open error
  if (!rdfile.isopen()) {
    error("demofgets");
  }

  cout << endl << f(
         "lines '>' end '\\n' character\n"
         "lines '#' not end '\\n' character\n"
         "\n");

  // read lines file
  while ((n = rdfile.fgets(line, sizeof(line))) > 0) {
    if (line[n - 1] == '\n') {
      cout << '>' << line;
    } else {
      cout << '#' << line << endl;
    }
  }
}
//------------------------------------------------------------------------------
void maketestfile() {
  // create or open test file
  sdfile wrfile("fgets.txt", o_write | o_creat | o_trunc);

  // check open error
  if (!wrfile.isopen()) {
    error("maketestfile");
  }

  // write test file
  wrfile.print(f(
                 "line crlf\r\n"
                 "line lf\n"
                 "long line require read\n"
                 "\n"  // empty line
                 "line @ eof without nl"
               ));
  wrfile.close();
}
//------------------------------------------------------------------------------
void setup(void) {
  serial.begin(9600);
  while (!serial) {}  // wait leonardo

  cout << f("type character start\n");
  while (serial.read() <= 0) {}
  delay(400);  // catch due reset problem

  // initialize sd card @ spi_half_speed avoid bus errors with
  // breadboards.  use spi_full_speed better performance.
  if (!sd.begin(chipselect, spi_half_speed)) {
    sd.initerrorhalt();
  }

  maketestfile();

  demofgets();

  cout << f("\ndone\n");
}
void loop(void) {}

many thanks,
pete

will offer bit of $ via paypal if can help?

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