Hello,
I am facing with a big problem with my tool based on LP2478 and NAND Flash with FAT Filesystem placed on the EMC bus together with a RAM.
The emFile version is 3.22a

My flash was obsolete and I have changed it for a new compatible one.
In this link I have included the two datasheet, NEW and OLD Nand FLASH.
drive.google.com/drive/folders…dhCsgp_KPeA0W?usp=sharing

I have problem with bad read: I have uploaded a screenshot of my device with the filesystem full LOG enabled.

the Busy pin is sampled via a GPIO pin in this way:

OPTIMIZE int FS_NAND_HW_X_WaitWhileBusy(U8 Unit, unsigned us)
{
//
// This function is called to check the busy pin of
// the NAND flash.
// When no busy pin is available this function should
// return 1, so the upper layer can check if NAND
// flash is busy.
//

/* while( FIO1PIN & (1 << 13) );// from high to low once
__asm
{
nop
nop
}*/
while( !(FIO2PIN & (1 << 12)) ); /* from low to high once */
return 0;

}


Verying from this:
EMC_STA_WAITWEN0 = 0x2;
EMC_STA_WAITOEN0 = 0x2;
EMC_STA_WAITRD0 = 0x1f;
EMC_STA_WAITPAGE0 = 0x1f;
EMC_STA_WAITWR0 = 0x1f;
EMC_STA_WAITTURN0 = 0xf;
EMC_STA_CFG0 = 0x00000081;

to this:

EMC_STA_WAITWEN0 = 0x0;
EMC_STA_WAITOEN0 = 0x0;
EMC_STA_WAITRD0 = 0x5;
EMC_STA_WAITPAGE0 = 0x2;
EMC_STA_WAITWR0 = 0x3;
EMC_STA_WAITTURN0 = 0x1;
EMC_STA_CFG0 = 0x00000081;


i have noticed that varying the EMC timing the problem changed: the problem is translated in the WRITING and the filesystem becomes corrupted and inusable (no more writing allowed). Unfortunately now I do not have screenshot of the error.

I tried to bypass the ECC error and reading single file I obtained only this error "Too few cluster allocated to file" (you can see this in the attachement file)



Anyone has some advices?
Thanks a lot.

Probably we found the problem:

the OLD NAND flash requires 1 bit ECC correction capabilities instead the ATO NAND flash is not 100% compatibile because requires 4 bit.
The our old file system version is only able to correct 1 bit.

We are working to solve this directly with support channel.

bye bye