//---------------------------------------------------------------------------------
void sdmmcValueHandler(u32 value, void* user_data) {
//---------------------------------------------------------------------------------
int result;
switch(value) {
case SDMMC_HAVE_SD:
result = sdmmc_read16(REG_SDSTATUS0);
fifoSendValue32(FIFO_SDMMC, result);
break;
case SDMMC_SD_START:
if (sdmmc_read16(REG_SDSTATUS0) == 0) {
result = 1;
} else {
sdmmc_controller_init();
result = sdmmc_sdcard_init();
}
fifoSendValue32(FIFO_SDMMC, result);
break;
case SDMMC_SD_IS_INSERTED:
result = sdmmc_cardinserted();
fifoSendValue32(FIFO_SDMMC, result);
break;
case SDMMC_SD_STOP:
break;
}
}
int mount() {
uint8_t i;
uint32_t temp;
int8_t partition;
sdmmc_controller_init();
temp = sdmmc_sdcard_init() ;
if (sdmmc_sdcard_readsectors(0,1,(void*)§)) return FAT_ERR_SDREAD; // Error reading MBR
else {
temp=sect[510] + (sect[511]<<8);
if(temp!=0xAA55) return FAT_ERR_MBR; // Check failed
else {
partition=-1;
for(i=0; i<4; i++) { // Max four partition to check
switch (sect[450+i*16]) { // Partition type
case 0x06: // FAT 16 CHS
temp=sect[447+i*16]*63+sect[448+i*16]-1;
if ((partition==-1) && temp) {
partition=i;
fat.LBA_Begin=temp;
fat.FAT_RecordLen=16;
}
break;
case 0x0B: // FAT 32 CHS
temp=sect[447+i*16]*63+sect[448+i*16]-1;
if ((partition==-1) && temp) {
partition=i;
fat.LBA_Begin=temp;
fat.FAT_RecordLen=32;
}
break;
case 0x0C: //FAT 32 LBA
temp=sect[454+i*16]+(sect[455+i*16]<<8)+(sect[456+i*16]<<16)+(sect[457+i*16]<<24);
if ((partition==-1) && temp) {
partition=i;
fat.LBA_Begin=temp;
fat.FAT_RecordLen=32;
}
break;
case 0x0E: // FAT 16 LBA
temp=sect[454+i*16]+(sect[455+i*16]<<8)+(sect[456+i*16]<<16)+(sect[457+i*16]<<24);
if ((partition==-1) && temp) {
partition=i;
fat.LBA_Begin=temp;
fat.FAT_RecordLen=16;
}
break;
default:
break;
}
if (partition==-1) return FAT_ERR_PARTITION; // No valid partition found
else {
if (sdmmc_sdcard_readsectors(fat.LBA_Begin,1,(void*)§)) return FAT_ERR_SDREAD; // Error reading FAT ID
else {
temp=sect[510]+(sect[511]<<8);
if(temp!=0xAA55) return FAT_ERR_FATID; // Check failed
else {
fat.BPB_BytsPerSec=sect[11]+(sect[12]<<8);
fat.BPB_SecPerClus=sect[13];
fat.BPB_RsvdSecCnt=sect[14]+(sect[15]<<8);
fat.BPB_NumFATs=sect[16];
fat.BPB_RootDirEnt=sect[17] + (sect[18]<<8);
if (fat.FAT_RecordLen==16) {
fat.BPB_RootDirEnt=sect[17] + (sect[18]<<8);
fat.BPB_FATS=sect[22]+(sect[23]<<8);
fat.BPB_RootClus=2;
} else {
fat.BPB_RootDirEnt=0;
fat.BPB_FATS=sect[36]+(sect[37]<<8)+(sect[38]<<16)+(sect[39]<<24);
fat.BPB_RootClus=sect[44]+(sect[45]<<8)+(sect[46]<<16)+(sect[47]<<24);
}
curfatsect=fat_begin_lba(fat);
if (sdmmc_sdcard_readsectors(curfatsect,1,(void*)&fatsect)) return -1;
rootdirsect = lba_addr(fat.BPB_RootClus);
return changedir("\\");
}
}
}
}
}
}
}
