FAT32 Reading/Writing with 8051: how?

[cbsirio]

Hi all,
I have to read/write files to an harddisk connected to a 8051 uP.

The hard disk is formatted in FAT32.

I was searching for "C" source (no asm) to read/WRITE files in this device...

Can someone help me ?

Many thanks in advance.

Sirio.

 

[klug]

Hi,

That question was here before, may be it will be usefull:

**broken link removed**

73! klug.

 

[year]

FAT32 ....
8051 has to compute 4 bytes arithmetic.
U may check cpu power that can be or not....

 

[cbsirio]

Klug: Thank you, but the link you posted have only "asm" reference...
I was searching for "C" source library or piece of code to extract them.


Year: I have no to hurry up... I have enough time to make the necessary calculations: I need about 10 kb/s of speed ...

Thanks again, Sirio.

 

[year]

And One More...

And also needs lots of SRAM to handle file read and write because of FAT size, as far as I know.

Please check MS home page and DDK...

 

[Jørd]

Well, here https://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2002/rjk18/index.htm actually is some C code to do some simple FAT32 access. Though not originally intended for '51 use, it might get you a starting point.

 

[binnyr]

HI:
Check out this site. Its based on AVR microcontrollers. Again this will prove to be a good starting point.

**broken link removed**

You can go thru the C code in the download sections...

Binny

 

[year]

I saw the web...
Very good sample to learn. I agree.

But writing function is not easy at HDD.
Anyway, you will know after you do...

These are points
- MBR
- PBS
- ROOT DIRECTORY ENTRY
- FAT1, FAT2 area
- LONG FILE NAME
- SUB DIRECORY(FOLDER)
- SUB DIECORY ENTRY

WINHEX is good tool to know FAT file system.

 

[cbsirio]

Very very nice!

And also, I have found a very nice document about FAT32, as suggested from "year" on microsoft site!

**broken link removed**

And I also see the two links posted ! Great!!

Many thanks to all... It's WORK time now! :wink:

Bye! Sirio

 

[year]

Hi cbsirio,

Now you seems like finding right way.

OK, that is not easy but can not be impossible...

Be success.

 

[Dspnut]

Hi all,

There is an on-going project described in an article (Circuit Cellar, Issue 150). The title is " Construct an ATA Hard Drive Controller". I believe that the author (Fred Eady) mentioned about FAT16, FAT32 read/write in his article. This article may be a good starting point for your project. Unfortunately, the microcontroller used in this project is ATmega128 (not your favorite 8051s ). However, the source code is written in C-language. I think that it should be easy to port this code to 8051 MCUs.

Hope this helps.

 

[cbsirio]

Hello Dspnut,

Excuse me for my question ... but what is Circuit Cellar ?

I know Electronic Express, but I have no idea on what is this... Is a periodic?
How can I find it ?

It seems to be very interesting, so, can you be more specific, please? :sm7:

Thank you!!

Again ... thanks all! :sm9:

 

[Dspnut]

Hi..cbsirio

Circuit Cellar is a (IMHO) very popular electronic and embedded system magazine. You can read some online articles here at

https://www.circuitcellar.com

Also look around in the MCU fileman.... :wink:

 

[Dspnut]

Hi..all,
In case that someone may want to take a look at the souce-code of the "Construct an ATA Hard Drive Controller" project. Here is the attached code (sorry no schematics ). Please keep in mind that this is an on-going project. So you will find that this source code is not yet completed. Let's wait for Mr. Fred Eady to publish his new article.

 

[dainis]

Look Ethernu project:
h**p://w*w.ethernut.de/en/index.html

Added: Cool IDE diskdrive and Compact Flash interface done by Michael Fischer. Supports FAT32 with long filenames

 

[tcsa35]

Hi,

Look this, may be work

h**p://www.ucos-ii.com/contents/products/file_system.html

 

[dainis]

Hi,

Look this, may be work

h**p://www.ucos-ii.com/contents/products/file_system.html

There is only available trial library without source code for:
"From this page you will be able to download a Visual C++ compiled library and sample code for the Windows environment"

 

[tufudamien]

ATA commands

/Deleted. Post links instead of files.
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ftp://ftp.t13.org/project/d1153r18.pdf
ftp://ftp.t13.org/project/d1321r3.pdf
(klug)/