ppera
Newbie level 2
I did some search about subject (thread). It looks as too complicated and not recommended. However, with helps of some newer special designed chips maybe not.
Using for instance USBN9603 - lot of registers, hard to make driver. Chip is available even in my place for some 8 Euros.
FT245 should be easier - but for me it's not clear: can it be used as USB host?
There are some Cypres and Philips chips, probably same problem as by USBN9603
I found today USBWiz - custom designed multifunction USB adapter:
**broken link removed**
It looks very promising, has even FAT filesystem support, and can communicate via standard UART. Additionally it can work with MMC and SD cards.
I made already IF for IDE drives, and I can use IDE FLASH or CF cards with them. But USB looks as good challenge, and most future proof, plus PEN-drives are cheapest at moment, and will be...
Can some expert judge how long would be code with 8-bit CPU or microcontroler to low level FLASH USB disk read/write - I mean without filesystem, just logical sector access?
According to what I saw wee need following main routines (calls):
Enumeration
Reading attached USB descriptor
Reading drives parameters - as geometry, size
Sector read/write
Drive reset
Last three should be SCSI type commands/calls
Probably I missed some steps, but it depends much from used USB adapter chip.
Or just go on solution with USBWiz?
Using for instance USBN9603 - lot of registers, hard to make driver. Chip is available even in my place for some 8 Euros.
FT245 should be easier - but for me it's not clear: can it be used as USB host?
There are some Cypres and Philips chips, probably same problem as by USBN9603
I found today USBWiz - custom designed multifunction USB adapter:
**broken link removed**
It looks very promising, has even FAT filesystem support, and can communicate via standard UART. Additionally it can work with MMC and SD cards.
I made already IF for IDE drives, and I can use IDE FLASH or CF cards with them. But USB looks as good challenge, and most future proof, plus PEN-drives are cheapest at moment, and will be...
Can some expert judge how long would be code with 8-bit CPU or microcontroler to low level FLASH USB disk read/write - I mean without filesystem, just logical sector access?
According to what I saw wee need following main routines (calls):
Enumeration
Reading attached USB descriptor
Reading drives parameters - as geometry, size
Sector read/write
Drive reset
Last three should be SCSI type commands/calls
Probably I missed some steps, but it depends much from used USB adapter chip.
Or just go on solution with USBWiz?
