#define SPI1_BASE             (APB2PERIPH_BASE + 0x3000UL)

typedef struct
{
  __IO uint32_t CR1;        /*!< SPI control register 1 (not used in I2S mode),      Address offset: 0x00 */
  __IO uint32_t CR2;        /*!< SPI control register 2,                             Address offset: 0x04 */
  __IO uint32_t SR;         /*!< SPI status register,                                Address offset: 0x08 */
  __IO uint32_t DR;         /*!< SPI data register,                                  Address offset: 0x0C */
  __IO uint32_t CRCPR;      /*!< SPI CRC polynomial register (not used in I2S mode), Address offset: 0x10 */
  __IO uint32_t RXCRCR;     /*!< SPI RX CRC register (not used in I2S mode),         Address offset: 0x14 */
  __IO uint32_t TXCRCR;     /*!< SPI TX CRC register (not used in I2S mode),         Address offset: 0x18 */
  __IO uint32_t I2SCFGR;    /*!< SPI_I2S configuration register,                     Address offset: 0x1C */
  __IO uint32_t I2SPR;      /*!< SPI_I2S prescaler register,                         Address offset: 0x20 */
} SPI_TypeDef;

mem_set(fp->buf, 0, _MAX_SS);    /* Clear sector buffer */

/* Fill memory block */
static
void mem_set (void* dst, int val, UINT cnt) {
    BYTE *d = (BYTE*)dst;
    do *d++ = (BYTE)val; while (--cnt);
}

static int open_test(void)
{
    /* Read a text file and display it */
        FIL fil;        /* File object */
        FRESULT fr;     /* FatFs return code */
        /* Open a text file */
        fr = f_open(&fil, "message.txt", FA_WRITE | FA_CREATE_ALWAYS);
        //if (fr) return (int)fr;
        rt_kprintf("the fr value in test is %d\r\n", fr);
        /*
        TCHAR *str = "hello";
        f_puts(str, &fil);
        */
        /* Close the file */
        f_close(&fil);
        return 0;
}
MSH_CMD_EXPORT(open_test, "open_test");