OPTION SDCARD GP22
OPTION SYSTEM SPI GP10,GP11,GP12
OPTION LCDPANEL ILI9488W, LANDSCAPE,GP8,GP15,GP9,GP13
OPTION TOUCH GP16,GP17
GUI CALIBRATE 0, 3946, 211, -1287, 853

OPTION SDCARD GP22, GP5, GP18, GP19

STATUS disk_initialize (
BYTE pdrv /* Physical drive nmuber (0) */
)
{
BYTE n, cmd, ty, ocr[4];


if (pdrv != 0) return STA_NOINIT; /* Supports only single drive */
SD_SPI_SPEED=SD_SLOW_SPI_SPEED;
SPISpeedSet(SDSLOW);
deselect(); /* Initialize memory card interface */
for (n = 10; n; n--) xchg_byte(0xFF); /* 80 dummy clocks */
ty = 0;

if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
Timer1 = 1000; /* Initialization timeout of 1000 msec */
if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */
for (n = 0; n < 4; n++) ocr[n] = xchg_byte(0xFF); /* Get trailing return value of R7 resp */

if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
while (Timer1 && send_cmd(ACMD41, 0x40000000)); /* Wait for leaving idle state (ACMD41 with HCS bit) */
if (Timer1 && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
for (n = 0; n < 4; n++) ocr[n] = xchg_byte(0xFF);
ty = (ocr[0] & 0x40) ? CT_SD2|CT_BLOCK : CT_SD2; /* SDv2 */
}
}
} else { /* SDv1 or MMCv3 */
if (send_cmd(ACMD41, 0) <= 1) {
ty = CT_SD1; cmd = ACMD41; /* SDv1 */
} else {
ty = CT_MMC; cmd = CMD1; /* MMCv3 */
}
while (Timer1 && send_cmd(cmd, 0)); /* Wait for leaving idle state */
if (!Timer1 || send_cmd(CMD16, 512) != 0) /* Set read/write block length to 512 */
ty = 0;
}
}
CardType = ty;
deselect();
if (ty) { /* Function succeded */
SDCardStat &= ~STA_NOINIT; /* Clear STA_NOINIT */
SD_SPI_SPEED=Option.SDspeed*1000000;
SPISpeedSet(SDFAST);
}

return SDCardStat;
}