File content as of revision 3:33086de19b14:

#include "mbed.h"
#include "SD_DISCO_F746NG.h"

SD_DISCO_F746NG sd;

DigitalOut led_green(LED1);
DigitalOut led_red(LED2);

Serial pc(USBTX, USBRX);

#define BLOCK_START_ADDR         0     /* Block start address      */
#define NUM_OF_BLOCKS            5     /* Total number of blocks   */
#define BUFFER_WORDS_SIZE        ((BLOCKSIZE * NUM_OF_BLOCKS) >> 2) /* Total data size in bytes */
 
uint32_t aTxBuffer[BUFFER_WORDS_SIZE];
uint32_t aRxBuffer[BUFFER_WORDS_SIZE];
/* Private function prototypes -----------------------------------------------*/
void SD_main_test(void);
void SD_Detection(void);

static void Fill_Buffer(uint32_t *pBuffer, uint32_t uwBufferLenght, uint32_t uwOffset);
static uint8_t Buffercmp(uint32_t* pBuffer1, uint32_t* pBuffer2, uint16_t BufferLength);
 
int main()
{
    uint8_t SD_state = MSD_OK;
    pc.printf("\n\nuSD example start:\n");
    led_red = 0;
  
    SD_state = sd.Init();
    if(SD_state != MSD_OK){
        if(SD_state == MSD_ERROR_SD_NOT_PRESENT){
            pc.printf("SD shall be inserted before running test\n");
        } else {
            pc.printf("SD Initialization : FAIL.\n");
        }
        pc.printf("SD Test Aborted.\n");
    } else {
        pc.printf("SD Initialization : OK.\n");

        SD_state = sd.Erase(BLOCK_START_ADDR, (BLOCK_START_ADDR + NUM_OF_BLOCKS - 1));

        /* Wait until SD card is ready to use for new operation */
        while(sd.GetCardState() != SD_TRANSFER_OK){
        }
        if (SD_state != MSD_OK){
            pc.printf("SD ERASE : FAILED.\n");
            pc.printf("SD Test Aborted.\n");
        } else {
            pc.printf("SD ERASE : OK.\n");
          
            /* Fill the buffer to write */
            Fill_Buffer(aTxBuffer, BUFFER_WORDS_SIZE, 0x2300);
          
            SD_state = sd.WriteBlocks(aTxBuffer, BLOCK_START_ADDR, NUM_OF_BLOCKS, 10000);
            /* Wait until SD card is ready to use for new operation */
            while(sd.GetCardState() != SD_TRANSFER_OK){
            }

            if (SD_state != MSD_OK){
                pc.printf("SD WRITE : FAILED.\n");
                pc.printf("SD Test Aborted.\n");
            } else {
                pc.printf("SD WRITE : OK.\n");
            
                SD_state = sd.ReadBlocks(aRxBuffer, BLOCK_START_ADDR, NUM_OF_BLOCKS, 10000);
                /* Wait until SD card is ready to use for new operation */
                while(sd.GetCardState() != SD_TRANSFER_OK){
                }

                if (SD_state != MSD_OK){
                    pc.printf("SD READ : FAILED.\n");
                    pc.printf("SD Test Aborted.\n");
                } else {
                    pc.printf("SD READ : OK.\n");
                    if(Buffercmp(aTxBuffer, aRxBuffer, BUFFER_WORDS_SIZE) > 0){
                        pc.printf("SD COMPARE : FAILED.\n");
                        pc.printf("SD Test Aborted.\n");
                    } else {
                        pc.printf("SD Test : OK.\n");
                        pc.printf("SD can be removed.\n");
                    }
                }
            }
        }
    }
  
    while (1) {
    }
} 

/**
  * @brief  Fills buffer with user predefined data.
  * @param  pBuffer: pointer on the buffer to fill
  * @param  uwBufferLenght: size of the buffer to fill
  * @param  uwOffset: first value to fill on the buffer
  * @retval None
  */
static void Fill_Buffer(uint32_t *pBuffer, uint32_t uwBufferLength, uint32_t uwOffset)
{
  uint32_t tmpIndex = 0;

  /* Put in global buffer different values */
  for (tmpIndex = 0; tmpIndex < uwBufferLength; tmpIndex++ )
  {
    pBuffer[tmpIndex] = tmpIndex + uwOffset;
  }
}
 
/**
  * @brief  Compares two buffers.
  * @param  pBuffer1, pBuffer2: buffers to be compared.
  * @param  BufferLength: buffer's length
  * @retval 1: pBuffer identical to pBuffer1
  *         0: pBuffer differs from pBuffer1
  */
static uint8_t Buffercmp(uint32_t* pBuffer1, uint32_t* pBuffer2, uint16_t BufferLength)
{
  while (BufferLength--)
  {
    if (*pBuffer1 != *pBuffer2)
    {
      return 1;
    }

    pBuffer1++;
    pBuffer2++;
  }

  return 0;
}