Read text files from pen drive usb

atmega64 · Joined: 23 Feb 2005 Posts: 298 Location: ITALY

Hi,
you may, kindly, give me an example on how to read a text file stored on a USB pen drive?
I can do it with an ATmega8?

thanks

(BASCOM-AVR version : 2.0.7.6 )

atmega64 · Joined: 23 Feb 2005 Posts: 298 Location: ITALY

I'll explain the application, I need to create:

I have to write and read a 5-digit number on a support to be given to various people ...

I thought about using a smartcard ...

some change to this application that I could find to make my case?

http://www.mcselec.com/index.php?option=com_content&task=view&id=100&Itemid=57

AdrianJ · Joined: 16 Jan 2006 Posts: 2483 Location: Queensland

I note you started two topics almost identical for this.

USB is way too complicated to implement in small AVRs.

See the very long thread about how it can be done: http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&t=7537

My suggestion would be SD or microSD card and AVR-DOS.

SD card is gross overkill for the storage required, but the cards are cheap, and so are the connectors. You could do the same with a small eeprom, but it would have to be mounted in a holder of some sort, and a matching connector.

AdrianJ · Joined: 16 Jan 2006 Posts: 2483 Location: Queensland

As a further off-the-wall thought. Create a PCB with a matrix of X-Y connections, say about 8 * 8 wires. Provide the AVR with a 16 way connector, 8 pins to each of two ports. Use a different connection matrix on each PCB issued - just solder bridges across some of the junctions. That gives you 256 possible different patterns. Then scan the matrix like a keyboard to recover the connection pattern. Issue one to each person.

StigOE · Joined: 16 Oct 2007 Posts: 41

I didn't quite understand what your need actually is, but if you need to give something to your customers which you can later verify to make sure they are 'genuine', how about Dallas/Maxim 1-wire buttons? They're easy to read and each have a unique serial number.

JC · Joined: 15 Dec 2007 Posts: 586 Location: Cleveland, OH

To read a USB thumb drive you need a device that can act as a USB Host.

There are only a couple of AVR's that support USB Host Mode.

See this Thread on AVR Freaks: http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=132871

JC

atmega64 · Joined: 23 Feb 2005 Posts: 298 Location: ITALY

Hi,

@edit by MOD ........

I must, of necessity, use a PenDriveUSB, formatted FAT32 ...

I need to read only 6 numbers ...

Please I need a valid way to follow ...

Thank you.

MWS · Joined: 22 Aug 2009 Posts: 2262

@Edit by MOD.....

I believe you expect some pre-made copy/paste code - but that's expected wrong.

kimmi · Joined: 24 Feb 2006 Posts: 1922 Location: Denmark

In the Italian BASCOM-AVR forum

You got all most same answers as here ,

atmega64 · Joined: 23 Feb 2005 Posts: 298 Location: ITALY

Very good,

I think the VNC1 is a solution to try ...

what do you think of this example?

http://www.mcselec.com/index.php?option=com_content&task=view&id=279&Itemid=57

MWS · Joined: 22 Aug 2009 Posts: 2262

Evert :-) · Joined: 18 Feb 2005 Posts: 2156

AdrianJ · Joined: 16 Jan 2006 Posts: 2483 Location: Queensland

I have this really bright shiny new shovel, and its really good at digging holes, and I really like it, and lots of other people have them too. But I want to dig a hole 4 miles wide and 6 miles deep, please tell me how to do that !

Twisted Evil

In my opinion you are trying to use the wrong tool for the job.

atmega64 · Joined: 23 Feb 2005 Posts: 298 Location: ITALY

MWS · Joined: 22 Aug 2009 Posts: 2262