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'[PIC] USB host mode?'
2006\05\16@232155 by Zik Saleeba

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I'm looking at using an 18f2550 to interface to a Canon Powershot
camera. I was looking into the USB specs in the 18f2550 data sheet and
it wasn't clear to me if it supports USB host mode or if it's only
good for USB client mode. Since I'm connecting to the camera's USB
client I need host mode at the microcontroller end. The data sheet
only seems to mention "connecting to a host" which doesn't sound
promising. Does anyone know?

Thanks,
Zik

2006\05\16@233156 by Herbert Graf

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On Wed, 2006-05-17 at 13:21 +1000, Zik Saleeba wrote:
> I'm looking at using an 18f2550 to interface to a Canon Powershot
> camera. I was looking into the USB specs in the 18f2550 data sheet and
> it wasn't clear to me if it supports USB host mode or if it's only
> good for USB client mode. Since I'm connecting to the camera's USB
> client I need host mode at the microcontroller end. The data sheet
> only seems to mention "connecting to a host" which doesn't sound
> promising. Does anyone know?

The PICs that support USB only support it as an end point. There is zero
support for host mode.

TTYL

2006\05\16@234246 by Bob Axtell

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Herbert Graf wrote:
> On Wed, 2006-05-17 at 13:21 +1000, Zik Saleeba wrote:
>  
>> I'm looking at using an 18f2550 to interface to a Canon Powershot
>> camera. I was looking into the USB specs in the 18f2550 data sheet and
>> it wasn't clear to me if it supports USB host mode or if it's only
>> good for USB client mode. Since I'm connecting to the camera's USB
>> client I need host mode at the microcontroller end. The data sheet
>> only seems to mention "connecting to a host" which doesn't sound
>> promising. Does anyone know?
>>    
>
> The PICs that support USB only support it as an end point. There is zero
> support for host mode.
>
> TTYL
>
>  
There are very few choices. Cypress has a couple of host mode chips. But
there is a lot of
grief associated with host mode, such as enumeration, ram space, etc
etc. Phillips might have something
by now.

Microchip (correctly) sees little advantage in pursuing such a lofty
goal. I agree.

--Bob

2006\05\16@234350 by Zik Saleeba

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Thanks Herbert. Serious bummer, but thanks.

Cheers,
Zik

On 17/05/06, Herbert Graf <spam_OUTmailinglist2TakeThisOuTspamfarcite.net> wrote:
{Quote hidden}

> -

2006\05\17@040622 by Dan Smith

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On 5/17/06, Zik Saleeba <.....zikKILLspamspam@spam@zikzak.net> wrote:
> I'm looking at using an 18f2550 to interface to a Canon Powershot
> camera. I was looking into the USB specs in the 18f2550 data sheet and
> it wasn't clear to me if it supports USB host mode

Have a look at the MAX3421E from Maxim - datasheet at
http://pdfserv.maxim-ic.com/en/ds/MAX3421E.pdf

It's a USB peripheral/host controller with an SPI Interface.

Dan

2006\05\17@042136 by Alan B. Pearce

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>There are very few choices. Cypress has a couple of
>host mode chips. But there is a lot of grief associated
>with host mode, such as enumeration, ram space, etc
>etc. Phillips might have something by now.
>
>Microchip (correctly) sees little advantage in pursuing
>such a lofty goal. I agree.

But somewhere along the line supporting USB-to-go must be a viable option,
and sounds like what the OP could really do with.

2006\05\17@045747 by Bob Axtell

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Dan Smith wrote:
> On 5/17/06, Zik Saleeba <zikspamKILLspamzikzak.net> wrote:
>  
>> I'm looking at using an 18f2550 to interface to a Canon Powershot
>> camera. I was looking into the USB specs in the 18f2550 data sheet and
>> it wasn't clear to me if it supports USB host mode
>>    
>
> Have a look at the MAX3421E from Maxim - datasheet at
> http://pdfserv.maxim-ic.com/en/ds/MAX3421E.pdf
>
> It's a USB peripheral/host controller with an SPI Interface.
>
> Dan
>
>  
Dan, the problem with Maxim... besides the fact that they never have
parts... is that
they don't have drivers lined up for this part, either. But maybe it can
be used somehow.

--Bob

2006\05\17@062518 by Zik Saleeba

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Bob, I have to agree. The Cypress and Maxim parts look good but
neither seem to have much software support. Since all I want to do is
trigger the camera's shutter it seems like a disproportionate amount
of work to have to develop a whole USB stack. If Cypress or Maxim
provided drivers I'd be a lot keener.

I'll probably end up rigging an RC servo to physically press the
shutter button. It's not my idea of an elegant solution but it's
better than nothing. I'd love to do the USB solution since it means I
can easily change the camera over but I guess that'll have to wait for
another revision.

Thanks everyone for your helpful responses!

Cheers,
Zik

On 17/05/06, Bob Axtell <.....engineerKILLspamspam.....cotse.net> wrote:
{Quote hidden}

> -

2006\05\17@070223 by Mike Harrison

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On Wed, 17 May 2006 20:25:18 +1000, you wrote:

>Bob, I have to agree. The Cypress and Maxim parts look good but
>neither seem to have much software support. Since all I want to do is
>trigger the camera's shutter it seems like a disproportionate amount
>of work to have to develop a whole USB stack. If Cypress or Maxim
>provided drivers I'd be a lot keener.
>
>I'll probably end up rigging an RC servo to physically press the
>shutter button. It's not my idea of an elegant solution but it's
>better than nothing. I'd love to do the USB solution since it means I
>can easily change the camera over but I guess that'll have to wait for
>another revision.

Doesn't the camera have an IR remote control..? This would be rather easier to simulate.....

2006\05\17@070235 by Alan B. Pearce

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>I'll probably end up rigging an RC servo to
>physically press the shutter button.

Is there not a connector for the electrical equivalent of a cable release?

2006\05\17@071417 by Xiaofan Chen

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On 5/17/06, Zik Saleeba <zikspamspam_OUTzikzak.net> wrote:
> Bob, I have to agree. The Cypress and Maxim parts look good but
> neither seem to have much software support. Since all I want to do is
> trigger the camera's shutter it seems like a disproportionate amount
> of work to have to develop a whole USB stack. If Cypress or Maxim
> provided drivers I'd be a lot keener.
>
> I'll probably end up rigging an RC servo to physically press the
> shutter button. It's not my idea of an elegant solution but it's
> better than nothing. I'd love to do the USB solution since it means I
> can easily change the camera over but I guess that'll have to wait for
> another revision.
>
> Thanks everyone for your helpful responses!
>
> Cheers,
> Zik

Check out Atmel AVR AT90USB647/1287 with USB on the go function.
http://www.atmel.com/dyn/products/product_card.asp?part_id=3875

Regards,
Xiaofan

2006\05\17@072114 by Zik Saleeba

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No it doesn't unfortunately. I could always dump it and go for a
camera family which has good image quality and consistently supports
the same kind of remote but unfortunately I haven't been able to find
any. (I want to be able to prototype with a cheaper camera and
potentially move up to a better camera later) In the end I'll just
settle for whatever I can make work I guess.

Cheers,
Zik

On 17/05/06, Mike Harrison <@spam@mikeKILLspamspamwhitewing.co.uk> wrote:
{Quote hidden}

> -

2006\05\17@073907 by Zik Saleeba

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You'd think a remote shutter release connector would be handy wouldn't
you? But like most compact digital cameras the only external
electrical connectors it has are power and USB. Maybe high end cameras
are more helpful.

Cheers,
Zik

On 17/05/06, Alan B. Pearce <KILLspamA.B.PearceKILLspamspamrl.ac.uk> wrote:
> >I'll probably end up rigging an RC servo to
> >physically press the shutter button.
>
> Is there not a connector for the electrical equivalent of a cable release?
>
> -

2006\05\17@074415 by Howard Winter

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Alan,

On Wed, 17 May 2006 12:02:31 +0100, Alan B. Pearce wrote:

> >I'll probably end up rigging an RC servo to
> >physically press the shutter button.
>
> Is there not a connector for the electrical equivalent of a cable release?

Most current digital cameras don't have either the physical cable release connector, or an electrical
equivalent.  It's really annoying, especially when you consider how easy it would be to do!  Also rather
surprising when you see what some manufacturers used to charge for a switch, a few metres of cable, and a
connector - the latter proprietary so you couldn't get them elsewhere, cheaper!  I seem to remember paying
UK£30 for a 3 metre remote cable for my conventional Minolta SLR, and about the same for a 5 metre extension
cable...

My current digital still camera (Canon) doesn't even have a socket to connect external power - you have to buy
a dummy battery with a lead attached, which costs UK£45 including an AC adaptor.  I suppose it gets over the
possible problem of overcharging the Li-ion battery if it was in place when you were using external power, but
it's still a pain!

Cheers,


Howard Winter
St.Albans, England


2006\05\17@074913 by Mat Clayton

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Thinking slightly outside the box here, do you have to use a PIC?

http://webuser.fh-furtwangen.de/~dersch/gphoto/remote.html

The NSLU2 boxes are around ~£60, and very hackable, might even be cheaper
:p, don’t know if that helps. Mat


{Original Message removed}

2006\05\17@075123 by Zik Saleeba

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Thanks Xiaofan that's looking pretty darn good!

Cheers,
Zik

On 17/05/06, Xiaofan Chen <RemoveMExiaofancTakeThisOuTspamgmail.com> wrote:
{Quote hidden}

> -

2006\05\17@092710 by Alan B. Pearce

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>Thinking slightly outside the box here, do you have to use a PIC?
>
> http://webuser.fh-furtwangen.de/~dersch/gphoto/remote.html
>
>The NSLU2 boxes are around ~£60, and very hackable, might
>even be cheaper :p, don't know if that helps. Mat

Looks like the sort of arrangement Russell needs for his dual CF cards ...

2006\05\17@140307 by Peter

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I am almost 90% sure that all Powershots have IR remote control.

Peter

2006\05\17@161533 by Howard Winter

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Peter,

On Wed, 17 May 2006 21:03:04 +0300 (IDT), Peter wrote:

>
> I am almost 90% sure that all Powershots have IR remote control.

Mine is in your 10% uncertainty range, then!  :-)  It's the Powershot S50, and although it can be used for
remote capture (connect to a PC via USB and the software on the PC takes over the camera, allowing remote
control and image capture from the PC) there's no IR remote control - or even an IR sensor.

Cheers,


Howard Winter
St.Albans, England


2006\05\17@184258 by Zik Saleeba

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This one's a Powershot A310. I checked the manual - definitely no remote.

Cheers,
Zik

On 18/05/06, Peter <TakeThisOuTplpEraseMEspamspam_OUTactcom.co.il> wrote:
>
> I am almost 90% sure that all Powershots have IR remote control.
>
> Peter
> -

2006\05\17@184914 by Zik Saleeba

face picon face
Nice idea!

The application I have in mind here is aerial photography from a 2m
wingspan model plane. Size and weight are considerations which is why
I'm using a compact camera. The idea is to use a gumstix SBC running
linux connected via serial to the microcontroller. The microcontroller
takes care of the servos and various peripherals including the camera.

I don't think an NSLU2 would fit on my plane but it's a nice idea nonetheless.

Cheers,
Zik

On 17/05/06, Mat Clayton <RemoveMEmsc41spamTakeThisOuTcam.ac.uk> wrote:
> Thinking slightly outside the box here, do you have to use a PIC?
>
> http://webuser.fh-furtwangen.de/~dersch/gphoto/remote.html
>
> The NSLU2 boxes are around ~£60, and very hackable, might even be cheaper
> :p, don't know if that helps. Mat
>
>
> {Original Message removed}

2006\05\17@201803 by Henry Hallam

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The USBwiz ( http://www.ghielectronics.com/USBwiz.htm ) looks pretty
good although I haven't used it myself.  As well as its built-in,
really-easy-to-use drivers for mass storage devices and printers, you
can also control the endpoints and other USB magical things a bit more
directly (but still at quite an abstracted level) so with a bit of
hacking you should be able to control the camera.

Cheers

Henry

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