I have an SD card in a camera. I want to use a controller to work the
camera. The construction of the camera doesn't lend itself to just
putting a scope on the SD card while it is working.

What I would like is some way to tell the controller that the picture
the camera just finished taking is in memory and it is OK to shut off
the camera. Is there some handshaking line that I could use to tell
when the card is being accessed and when it is just sitting there
waiting?
--


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On a sunny day (Sun, 09 Mar 2008 14:40:55 -0500) it happened default
<default@defaulter.net> wrote in <0se8t391mf5mtsm9pc5k93r7bn7umrckoo@4ax.com>:

>I have an SD card in a camera. I want to use a controller to work the
>camera. The construction of the camera doesn't lend itself to just
>putting a scope on the SD card while it is working.
>
>What I would like is some way to tell the controller that the picture
>the camera just finished taking is in memory and it is OK to shut off
>the camera. Is there some handshaking line that I could use to tell
>when the card is being accessed and when it is just sitting there
>waiting?

The card has a CS (Chip Select) line, when no activity there for some time
you could take that as 'done', but there is a lot more to SD card protocols.

default wrote:
>
> I have an SD card in a camera. I want to use a controller to work the
> camera. The construction of the camera doesn't lend itself to just
> putting a scope on the SD card while it is working.
>
> What I would like is some way to tell the controller that the picture
> the camera just finished taking is in memory and it is OK to shut off
> the camera. Is there some handshaking line that I could use to tell
> when the card is being accessed and when it is just sitting there
> waiting?
> --

Perhaps this is the wrong approach. Most digital cameras have a USB port
and expose a camera control protocol in addition to the contents of
their SD card here.

There are some open source projects you can look at which will lead you
to documentation on specific camera interfaces. GPhoto is one (used on
Linux) I am familiar with.

--
Paul Hovnanian paul@hovnanian.com
-----------------------------------------------------------------------
Procrastinators: The leaders for tomorrow.

On Mar 9, 2:40=EF=BF=BDpm, default <defa...@defaulter.net> wrote:
> I have an SD card in a camera. =EF=BF=BDI want to use a controller to work=
the
> camera. =EF=BF=BDThe construction of the camera doesn't lend itself to jus=
t
> putting a scope on the SD card while it is working.
>
> What I would like is some way to tell the controller that the picture
> the camera just finished taking is in memory and it is OK to shut off
> the camera. =EF=BF=BDIs there some handshaking line that I could use to te=
ll
> when the card is being accessed and when it is just sitting there
> waiting?
> --
>
> ----=3D=3D Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet N=
ews=3D=3D----http://www.pronews.comThe #1 Newsgroup Service in the World! >1=
00,000 Newsgroups
> ---=3D - Total Privacy via Encryption =3D---

One idea -- possibly not the best?

Can you just use the flash on the camera as an "input" to your
controller to know that the camera just took a picture, and then wait
a reasonable pre-determined period after that flash for the SD to do
it's thing? (In other words, set it up to use the flash, even if you
don't need it for exposure, and key off the flash with a
phototransistor.)

Note: I am assuming that the controller is not instructing the camera
to take the picture and that the camera does that by itself in
response to some other stimulus. Otherwise, this would be a rather
circular approach. -mpm

On Sun, 9 Mar 2008 14:14:15 -0700 (PDT), mpm <mpmillard@aol.com>
wrote:

>On Mar 9, 2:40?pm, default <defa...@defaulter.net> wrote:
>> I have an SD card in a camera. ?I want to use a controller to work the
>> camera. ?The construction of the camera doesn't lend itself to just
>> putting a scope on the SD card while it is working.
>>
>> What I would like is some way to tell the controller that the picture
>> the camera just finished taking is in memory and it is OK to shut off
>> the camera. ?Is there some handshaking line that I could use to tell
>> when the card is being accessed and when it is just sitting there
>> waiting?
>> --
>>
>> ----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----http://www.pronews.comThe #1 Newsgroup Service in the World! >100,000 Newsgroups
>> ---= - Total Privacy via Encryption =---
>
>One idea -- possibly not the best?
>
>Can you just use the flash on the camera as an "input" to your
>controller to know that the camera just took a picture, and then wait
>a reasonable pre-determined period after that flash for the SD to do
>it's thing? (In other words, set it up to use the flash, even if you
>don't need it for exposure, and key off the flash with a
>phototransistor.)
>
>Note: I am assuming that the controller is not instructing the camera
>to take the picture and that the camera does that by itself in
>response to some other stimulus. Otherwise, this would be a rather
>circular approach. -mpm

That would be self defeating but thanks for the suggestion. Just
charging the flash capacitor would sap more energy than running the
camera longer to allow for the pix to go into memory. I want to avoid
a modification that prevents the camera from functioning normally.

The controller is telling the camera to take a shot - the length of
time it takes to get the picture from the shutter click and safely
into memory varies, and the controller doesn't have a clue when it is
finished.
--


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---= - Total Privacy via Encryption =---

On Sun, 9 Mar 2008 13:05:05 -0800, "Michael A. Terrell"
<mike.terreIl@earthlink.net> wrote:

>
>"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
>news:fr1h5v$fte$1@news.datemas.de...
>> The card has a CS (Chip Select) line, when no activity there for some
>> time
>> you could take that as 'done', but there is a lot more to SD card
>> protocols.
>
>
>
>CS is only a momentary access line, not a good source to detect "Finish"
>signal.
>
I've done some reading looks like the chip select line has to be low
to write to the card. With only one card, however, it can probably
stay low 24/7 and work OK.

>Default, you have to look at the power line of your SD card or your Camera
>power source, if you want the external controller to shut off the camera
>then you're having a difficult task, it should be the other way around.

The controller does shut off the camera - I just want to make sure the
picture is safely in memory before it shuts it off.
--


----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
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---= - Total Privacy via Encryption =---

On Mar 9, 7:40=A0pm, default <defa...@defaulter.net> wrote:
> I have an SD card in a camera. =A0I want to use a controller to work the
> camera. =A0The construction of the camera doesn't lend itself to just
> putting a scope on the SD card while it is working.
>
> What I would like is some way to tell the controller that the picture
> the camera just finished taking is in memory and it is OK to shut off
> the camera. =A0Is there some handshaking line that I could use to tell
> when the card is being accessed and when it is just sitting there
> waiting?
> --
>
> ----=3D=3D Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet N=
ews=3D=3D----http://www.pronews.comThe #1 Newsgroup Service in the World! >1=
00,000 Newsgroups
> ---=3D - Total Privacy via Encryption =3D---

Dead easy the LED flashes until the picture is in memory !

On a sunny day (Sun, 09 Mar 2008 19:04:29 -0500) it happened default
<default@defaulter.net> wrote in <nju8t3d5joashidtfl7b1uq95dflirlu2l@4ax.com>:

>On Sun, 9 Mar 2008 13:05:05 -0800, "Michael A. Terrell"
><mike.terreIl@earthlink.net> wrote:
>
>>
>>"Jan Panteltje" <pNaonStpealmtje@yahoo.com> wrote in message
>>news:fr1h5v$fte$1@news.datemas.de...
>>> The card has a CS (Chip Select) line, when no activity there for some
>>> time
>>> you could take that as 'done', but there is a lot more to SD card
>>> protocols.
>>
>>
>>
>>CS is only a momentary access line, not a good source to detect "Finish"
>>signal.
>>
>I've done some reading looks like the chip select line has to be low
>to write to the card. With only one card, however, it can probably
>stay low 24/7 and work OK.
>
>>Default, you have to look at the power line of your SD card or your Camera
>>power source, if you want the external controller to shut off the camera
>>then you're having a difficult task, it should be the other way around.
>
>The controller does shut off the camera - I just want to make sure the
>picture is safely in memory before it shuts it off.

Well, there should be a maximum time it takes, so timer.
OTOH you could use a PIC to monitor the other SDcard lines for change (interrupt on change),
after it stops changing it would be ready.

I dunno how sophisticated you are, as you cross post to basics, there
are many ways to do this.
The delay being the simplest.

On 10 mrt, 06:57, "Jamie" <jamie_the_big_shit_of_a...@charter.net>
wrote:
> "Marra" <cresswellave...@talktalk.net> wrote in messagenews:6b3dc0ef-3f85-43bc-82fb-d5ff5279c866@n77g2000hse.googlegroups.com...

> Dead easy the LED flashes until the picture is in memory !
>
> Good point dundfuck, the question is, how do you get to the LED in a camera? Break it with a hammer?

Photo transistor sucked against it, you know.

On Mon, 10 Mar 2008 09:30:34 -0700 (PDT), panteltje@yahoo.com wrote:

>On 10 mrt, 06:57, "Jamie" <jamie_the_big_shit_of_a...@charter.net>
>wrote:
>> "Marra" <cresswellave...@talktalk.net> wrote in messagenews:6b3dc0ef-3f85-43bc-82fb-d5ff5279c866@n77g2000hse.googlegroups.com...
>
>> Dead easy the LED flashes until the picture is in memory !
>>
>> Good point dundfuck, the question is, how do you get to the LED in a camera? Break it with a hammer?
>
>Photo transistor sucked against it, you know.
>

Jan, You just replied to a forgery.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On Mon, 10 Mar 2008 09:43:47 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

>On Mon, 10 Mar 2008 09:30:34 -0700 (PDT), panteltje@yahoo.com wrote:
>
>>On 10 mrt, 06:57, "Jamie" <jamie_the_big_shit_of_a...@charter.net>
>>wrote:
>>> "Marra" <cresswellave...@talktalk.net> wrote in messagenews:6b3dc0ef-3f85-43bc-82fb-d5ff5279c866@n77g2000hse.googlegroups.com...
>>
>>> Dead easy the LED flashes until the picture is in memory !
>>>
>>> Good point dundfuck, the question is, how do you get to the LED in a camera? Break it with a hammer?
>>
>>Photo transistor sucked against it, you know.
>>
>
>Jan, You just replied to a forgery.
>
> ...Jim Thompson

Oooops! I just replied to someone forging Jan

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On a sunny day (Mon, 10 Mar 2008 09:43:47 -0700) it happened Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
<89pat3djkdt1do64s9ah737laqcpplh0mf@4ax.com>:

>On Mon, 10 Mar 2008 09:30:34 -0700 (PDT), panteltje@yahoo.com wrote:
>
>>On 10 mrt, 06:57, "Jamie" <jamie_the_big_shit_of_a...@charter.net>
>>wrote:
>>> "Marra" <cresswellave...@talktalk.net> wrote in
>>> messagenews:6b3dc0ef-3f85-43bc-82fb-d5ff5279c866@n77g2000hse.googlegroups.com...
>>
>>> Dead easy the LED flashes until the picture is in memory !
>>>
>>> Good point dundfuck, the question is, how do you get to the LED in a camera? Break it with a hammer?
>>
>>Photo transistor sucked against it, you know.
>>
>
>Jan, You just replied to a forgery.

Yes, possible, I posted via google groups this time for a change,
and the whole thread seemed messed up somehow.

I see postings condemning aioe.org, that is not correct, I use aioe.org
a lot, it is an open server, so killing aioe.org will also kill the good postings.
Message ID changes with every posting, it comes from a random generator, except
perhaps when the guy forges the headers, but message ID is added in aioe.org,
I do not see how he could do that unless he had hacked that server.
Best perhaps just to ignore the bad guy.
I should have, but 'sucked against it, you know' was my hint at him/her/it.

On a sunny day (Mon, 10 Mar 2008 09:52:27 -0700) it happened Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
<kopat3p3v34vk3fs60egrjmf2ia7te2d1k@4ax.com>:

>>>Photo transistor sucked against it, you know.
>>>
>>
>>Jan, You just replied to a forgery.
>>
>> ...Jim Thompson
>
>Oooops! I just replied to someone forging Jan

No you did not