void sd_read(char *a)
{
uint8_t cmd0_response = sd_cmd0();
if(cmd0_response == 1)
sprintf(a, "SD: %02x OK ", cmd0_response);
else
sprintf(a, "SD: %02x FAIL", cmd0_response);
}
rt_uint8_t sd_init(void)
{
//-- SD controller & card initialize
int i;
/* Important notice for MMC test condition */
/* Cmd & Data lines must be enabled by pull up resister */
SDIPRE = PCLK/(INICLK)-1;
SDICON = (0<<4) | 1; // Type A, clk enable
SDIFSTA = SDIFSTA | (1<<16);
SDIBSIZE = 0x200; /* 512byte per one block */
SDIDTIMER=0x7fffff; /* timeout count */
/* Wait 74SDCLK for MMC card */
for(i=0; i<0x1000; i++);
sd_cmd0();
/* Check SD card OCR */
if(sd_ocr() == RT_EOK)
{
rt_kprintf("In SD ready\n");
}
else
{
rt_kprintf("Initialize fail\nNo Card assertion\n");
return RT_ERROR;
}
RECMD2:
SDICARG = 0x0;
SDICCON = (0x1<<10)|(0x1<<9)|(0x1<<8)|0x42; /* lng_resp, wait_resp, start, CMD2 */
if(sd_cmd_end(2, 1) == RT_ERROR)
goto RECMD2;
SDICSTA = 0xa00; /* Clear cmd_end(with rsp) */
RECMD3:
SDICARG = 0<<16; /* CMD3(MMC:Set RCA, SD:Ask RCA-->SBZ) */
SDICCON = (0x1<<9)|(0x1<<8)|0x43; /* sht_resp, wait_resp, start, CMD3 */
if(sd_cmd_end(3, 1) == RT_ERROR)
goto RECMD3;
SDICSTA=0xa00; /* Clear cmd_end(with rsp) */
RCA = (SDIRSP0 & 0xffff0000 )>>16;
SDIPRE=PCLK/(SDCLK)-1; /* Normal clock=25MHz */
if( SDIRSP0 & 0x1e00 != 0x600 )
goto RECMD3;
sd_sel_desel(1);
sd_delay(200);
sd_setbus();
return RT_EOK;
}
int sd_init()
{
UBYTE timeout;
spi_set_speed(0x7f); // min speed
// wait a bit
spi_assert_cs();
for(timeout=0x10; timeout>0; --timeout) {
spi_send_byte(0xff);
}
spi_deassert_cs();
spi_send_byte(0xff);
spi_send_byte(0xff);
spi_assert_cs();
// go into idle state
timeout = 0xff;
while (sd_cmd0() != 0x01) {
if (timeout==0) {
spi_deassert_cs();
return FALSE;
}
timeout = timeout-1;
}
if (sd_cmd8() == 0x01) {
// SD card V2+
#ifdef DEBUG_SD
debug_puts("SD card V2+\n");
#endif
// initialize card
timeout = 0xff;
while ((sd_acmd41(0x40)&1)!=0) {
if (timeout==0) {
spi_deassert_cs();
return FALSE;
}
timeout = timeout-1;
}
// read OCR
if (sd_cmd58()!=0) {
spi_deassert_cs();
return FALSE;
}
} else {
// SD card V1 or MMC
if (sd_acmd41(0x00)<=1) {
// SD V1
#ifdef DEBUG_SD
debug_puts("SD V1\n");
#endif
timeout = 0xff;
while ((sd_acmd41(0x00)&1)!=0) {
if (timeout==0) {
spi_deassert_cs();
return FALSE;
}
timeout = timeout-1;
}
} else {
// MM Card : fail
#ifdef DEBUG_SD
debug_puts("MMC\n");
#endif
spi_deassert_cs();
return FALSE;
}
}
spi_deassert_cs();
spi_set_speed(0x00); // max speed
return TRUE;
}