Lpc2000

rtstofer wrote:

>--- In lpc2000@yahoogroups.com, Tom Walsh <tom@o...> wrote:
>  
>
>>rtstofer wrote:
>>
>>    
>>
>>>--- In lpc2000@yahoogroups.com, "Martin Maurer" 
>>>      
>>>
><mailingliste@c...> 
>  
>
>>>wrote:
>>> 
>>>
>>>      
>>>
>>>>Try
>>>>
>>>>http://alumnus.caltech.edu/~pje/rdcf2.txt
>>>>
>>>>It works !
>>>>
>>>>Regards,
>>>>
>>>>       Martin
>>>>   
>>>>
>>>>        
>>>>
>>>It looks like rdcf2 is quite complete and includes a test suite.  
>>>      
>>>
>It 
>  
>
>>>supports FAT12 and FAT16 and the documentation is very good.
>>>
>>>It can also be built under DOS with TurboC so I can play with it 
>>>      
>>>
>on 
>  
>
>>>my DOS box before I port it to the LPC2106.
>>>
>>>Moving back to FAT16 versus getting nowhere with FAT32 seems like 
>>>      
>>>
>a 
>  
>
>>>good tradeoff.
>>>
>>> 
>>>
>>>      
>>>
>>The alloc() and free() function calls have to be written out.  
>>    
>>
>Otherwise 
>  
>
>>we are in danger of fragmenting the RAM on the LPC2000 processors.
>>
>>TomW
>>    
>>
>
>Yes but many implemtations allocate storage for a predefined maximum 
>number of open files.  Not a big deal, these are microcontrollers, 
>not workstations.
>
>I need to correct myself re: RDCF2.  I compiled it and it executes 
>well when installed on a floppy and interacting with a floppy.
>
>It does not work from my hard drive whether interacting with the HD 
>where it fails completely or the floppy where it gets just about 
>everything wrong.
>
>I traced the hard drive failure to the first call to absread where 
>the code is trying to read absolute sector 0.  I have to think about 
>this but I think it is incorrect.  In any event, the call fails.
>
>Another limitation to RDCF2 is a 32 MB limit so the code is for a 
>very early version of FAT.  From the very first paragraph of the doc 
>file: "RDCF is a reentrant and ROMable DOS-compatible file system 
>designed for use with floppy diskettes and hard disk partitions that 
>do not exceed 32 Mbytes in size."
>
>Anyway, scrap that version; it doesn't really work.
>
>  
>
No, there is code in there to adapt between 12bit & 16bit FATs..  It 
does appear to be working, I'm writing files onto a 128Meg MMC image.  
More testing is needed before I'm confident that what I reworked is 
doing what it should: write a bunch of 32Meg files and verify contents.

TomW



-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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