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Microntroller USB mobile interface


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cyberdyne

Sun Sep 21 2008, 12:18AM

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hi frndsz,
i am currently doing a project on developing a USB interface between a 8051 microcontroller and a mobile phone,the mobile phone uses a usb data cable .I know there are few chips like FTDI to make things easier.i have few doubts regarding it.
1.Can we send the same AT commands via the serial port(8051) to FTDI chip which will send to the mobile via the data cable?Will the command work correctly?
2.Are the ftdi chips very expensive to buy or better make the interfaces on our own?
3.Does the chip need any special driver to run properly?

i would like to thank Mr.Ajay who initially helped me to make a serial interface which is now working perfectly .

sashijoseph

Mon Sep 22 2008, 07:31PM

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for your project you would need a microcontroller with usb-host capabilities.Then you would need to implement a USB stack on it.Only then will you be able to communicate with other (slave) usb devices.
Simply interfacing with a FTDI won't work.

Check out this thread...
http://www.8051projects.net/lofiversion/t9363/microcontroller---pen-drive-interfacing.html

[ Edited Mon Sep 22 2008, 07:33PM ]

Let there be music........

cyberdyne

Tue Sep 23 2008, 04:31AM

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thanks sathish for ur reply.Yesterday i downloaded the data sheet of ftdi232r from the website and pls c the circuit.Correct me if it is wrong as i dont have much expertise in this area

cyberdyne

Tue Sep 23 2008, 04:35AM

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sorry the link is
http://rapidshare.com/files/147675645/untitled.bmp.html

ExperimenterUK

Tue Sep 23 2008, 01:55PM

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@cyberdyne

USB needs a host and a device, that is a master and a slave.

The master does a lot more work than a slave and is more complex.

Your ftdi232r is a mini slave, sending serial data to and from
the 8051, but it has to have a master on other other end of the USB line.

Your phone is another slave, so it will not work.

There are chips that will act as a master and be controlled by a micro,
which would probably work with a 8051.

They tend to be expensive and come in complex surface mount packages.
Google" usb host controllers" [edited to add "host"]

Microchip's 24F and 32F ranges have PICs with built in USB hosts,
these would probably be cheaper, and easier to work with.

It is quite an ambitious project either way

I'd be interested to hear how you get on.

[ Edited Wed Sep 24 2008, 01:53PM ]

Learning all the time

Ajay

Wed Sep 24 2008, 07:29AM

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there is also 18F ICs with onchip USB interface like 18F4550.

www.rickeyworld.info
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Obey forum rules!
Respect others!

cyberdyne

Wed Sep 24 2008, 07:57AM

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thanks frnds for the reply.which one of the above mentioned is the easiest as i have no prior knowledge about PIC.any option with 8051 will greatly help for programming purpose.

cyberdyne

Wed Sep 24 2008, 08:02AM

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how abt this option frnds Atmel's AT83C5134.Will this work properly it says it has inbuilt usb controller features.any suggestions !

ExperimenterUK

Wed Sep 24 2008, 02:06PM

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cyberdyne wrote ...

how abt this option frnds Atmel's AT83C5134.Will this work properly it says it has inbuilt usb controller features.any suggestions !

The AT83C5134 has a USB "device" interface.. IE a slave.. so no good.
The same goes for the Microchip 18F range.

You need to look for the words "Host" or "OTG" (On The Go), these are masters.
The Atmel 90USB647 and 90USB1287 should be OK.

This plug in module should most of the work for you, and there will be others.
http://www.dontronics-shop.com/ftdi-vdip1-mcu-to-usb-host-controller-development-module.html

Meanwhile here are links to chips to consider
http://www.lvr.com/usbchips.htm

Which is the best setup ?
I'd go for a plug in module.
After that a micro with built in Host..
Microchip or Atmel etc.. no idea

.. probably very similar.

By the way..it's probably better to edit your last post rather than post again immediately
to add something.

[ Edited Wed Sep 24 2008, 05:14PM ]

Learning all the time

cyberdyne

Thu Sep 25 2008, 05:51AM

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thanks Experimenter! the Atmel 90USb series are really gud.Do u need a separarte programmer for this or the older ones for 89c51 are ok.I glad to inform that my project was selected for the practical implementation at my college with support from a local hospital.So i will be needing a lot of these similar pieces can u suggest me the most cheapest one as i will be intially spending the amount for the development till their acceptance

thank u