Simple example how to use the block device

#include "mbed.h"
#include "BD_SD_DISCO_F746NG.h"

DigitalOut led (LED1);

// Instantiate the Block Device for sd card on DISCO-F746NG
BD_SD_DISCO_F746NG bd;
uint8_t block[512] = "Hello World!\n";

int
main () {
  Serial pc (SERIAL_TX, SERIAL_RX);
  pc.baud (115200);
  printf ("Start\n");

  // Call the BD_SD_DISCO_F746NG instance initialisation method.
  printf ("sd card init...\n");
  if (0 != bd.init ()) {
    printf ("Init failed \n");
    return -1;
  }

  printf ("sd size: %llu\n", bd.size ());
  printf ("sd read size: %llu\n", bd.get_read_size ());
  printf ("sd program size: %llu\n", bd.get_program_size ());
  printf ("sd erase size: %llu\n\n", bd.get_erase_size ());

  printf ("sd erase...\n");
  if (0 != bd.erase (0, bd.get_erase_size ())) {
    printf ("Error Erasing block \n");
  }

  // Write some the data block to the device
  printf ("sd write: %s\n", block);
  if (0 == bd.program (block, 0, 512)) {
    // read the data block from the device
    printf ("sd read: ");
    if (0 == bd.read (block, 0, 512)) {
      // print the contents of the block
      printf ("%s", block);
    }
  }

  // Call the BD_SD_DISCO_F746NG instance de-initialisation method.
  printf ("sd card deinit...\n");
  if (0 != bd.deinit ()) {
    printf ("Deinit failed \n");
    return -1;
  }

  // Blink led with 2 Hz   
  while (true) {
    led = !led;
    wait (0.5);
  }
}