FAT32 problem

[Chawee]

Hi,

i using the FAT and MMC/SD driver from CCS. The Fat-init is ok, also i can use the mmc/sd commands for example to read ot the card data. All this works fine. But if i try the "ex-fat.c" examples, nothing happend. I use the dir command but i only get the output " -/ "
Also all other examoles doesn´t work.
I using a 1 GB Kingston SD-CARD (FAT32 Format )and i put a few textfiles to the root.

Could anyone help me?

Chawee

[Chawee]

Hello,

no one have an idea, which could be my problem. My SD-CARD is formatted with 512Bytes Blocksize.
All the SD_CARD functions works probarly, only the fat makes problem. If i call the function for FAT Indformation, i only get zeros.

Please help me

Chawee

[Evan]

I now also am and your similar question(I alone have tested mmcsd.c am do not have the question )
I thought is the CCSC fat.c->fat_init() error.Has not obtained bpbstart!!!
EX:CCSC LIBcode:
signed int fat_init()
{
:
:

// initialize the media
ec += mmcsd_init();
//******************************
!!!-->Must jump DBR ,==>obtained bpbstart!!!

Other examples :
bpbstart=0;
mmc_open_block(0x00000000);
mmc_skip(0xE3); //0xe3=227 X2=454 从主引导记录里读到分区的起始扇区(从这个地址读到逻辑地址的0扇区)
mmc_read();

bpbstart=((int16) data_hi<<8);
bpbstart+=data_lo;
mmc_cancel_block();

//------------BPB-------------FAT32---------------------------------------------
//bpbstart:256mb=101
mmc_open_block((int32) bpbstart); // 打开主引导区 //
mmc_skip(5);
mmc_read();
BPB_bytspersec=data_hi; //11 每扇区字节数
mmc_read();
BPB_bytspersec=BPB_bytspersec+((int16) data_lo<<8); //11.12
BPB_SecPerClus=data_hi; //13 每簇扇区数
mmc_read();
BPB_ResvdSecCnt=((int16) data_hi<<8)+data_lo; //14.15 保留扇区数，从DBR到FAT的扇区数


//********************************

// start filling up variables
ec += mmcsd_read_data(11, 2, &Bytes_Per_Sector);
ec += mmcsd_read_data(13, 1, &Sectors_Per_Cluster);
ec += mmcsd_read_data(14, 2, &Reserved_Sectors);
ec += mmcsd_read_data(16, 1, &FATs);
:
:
//************************************
I am sorry, my english is very poor
Evan 中国.

[Chawe]

Hi Evan,

i´m sorry, but i don´t understand what you want to tell me. I have to change something at the code?

Chawee

[Evan]

Hi Chawe

I think the reason is that when FAT-INT() is running, it is still in MBR zone instead of BPB zone, so all the data you got are 0. Now what you have to do is check that if it has entered into BPB zone.