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A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
Flash memory - jvoytovich - Oct 1 23:30:58 2008
Does anyone know what chips are used to provide the large memory size
of the flash drive units (ie, 1GB range)? I built a project using an
Atmel chip that was 8M in size, and that cost about $8. I wanted to
build a datalog board with about 50MB on-board.
Thanks.
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of the flash drive units (ie, 1GB range)? I built a project using an
Atmel chip that was 8M in size, and that cost about $8. I wanted to
build a datalog board with about 50MB on-board.
Thanks.
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
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Re: Flash memory - Phil Seakins - Oct 2 0:21:57 2008
I wonder if it wouldn't be easier and cheaper to just put a USB socket
on your board and use an off the shelf flash disk.
On 10/2/08, jvoytovich wrote:
>
> Does anyone know what chips are used to provide the large memory size
> of the flash drive units (ie, 1GB range)? I built a project using an
> Atmel chip that was 8M in size, and that cost about $8. I wanted to
> build a datalog board with about 50MB on-board.
>
> Thanks.
>
------------------------------------
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on your board and use an off the shelf flash disk.
On 10/2/08, jvoytovich
>
> Does anyone know what chips are used to provide the large memory size
> of the flash drive units (ie, 1GB range)? I built a project using an
> Atmel chip that was 8M in size, and that cost about $8. I wanted to
> build a datalog board with about 50MB on-board.
>
> Thanks.
>
------------------------------------
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Re: Flash memory - jvoytovich - Oct 2 1:53:45 2008
I thought about that - until I researched it. USB is fairly easy to
implement when you do it as a device (flash drive, etc). Doing it as a
host is a lot more difficult (and most of the PIC chips only support
the device mode).
Unless you've done that, and I've missed something here...
--- In p...@yahoogroups.com, "Phil Seakins" wrote:
>
> I wonder if it wouldn't be easier and cheaper to just put a USB socket
> on your board and use an off the shelf flash disk.
>
> On 10/2/08, jvoytovich wrote:
> >
> > Does anyone know what chips are used to provide the large memory size
> > of the flash drive units (ie, 1GB range)? I built a project using an
> > Atmel chip that was 8M in size, and that cost about $8. I wanted to
> > build a datalog board with about 50MB on-board.
> >
> > Thanks.
>
------------------------------------
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______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
implement when you do it as a device (flash drive, etc). Doing it as a
host is a lot more difficult (and most of the PIC chips only support
the device mode).
Unless you've done that, and I've missed something here...
--- In p...@yahoogroups.com, "Phil Seakins"
>
> I wonder if it wouldn't be easier and cheaper to just put a USB socket
> on your board and use an off the shelf flash disk.
>
> On 10/2/08, jvoytovich
> >
> > Does anyone know what chips are used to provide the large memory size
> > of the flash drive units (ie, 1GB range)? I built a project using an
> > Atmel chip that was 8M in size, and that cost about $8. I wanted to
> > build a datalog board with about 50MB on-board.
> >
> > Thanks.
>
------------------------------------
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Stellaris® MCU Family: New Parts, New Package, New Price.
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Re: Flash memory - Les Jones - Oct 2 3:47:48 2008
Hi,
Have you thought of using an "SD" card (Or other flash card.) and
interfacing that to the PIC. There was a design for a data logger in
the March 2008 issue of the "Elektor" magazine. The problem with this
design is that it is written in "MikroC" and this compiler is quite
expensive.
Les.
--- In p...@yahoogroups.com, "jvoytovich" wrote:
>
> Does anyone know what chips are used to provide the large memory size
> of the flash drive units (ie, 1GB range)? I built a project using an
> Atmel chip that was 8M in size, and that cost about $8. I wanted to
> build a datalog board with about 50MB on-board.
>
> Thanks.
>
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Have you thought of using an "SD" card (Or other flash card.) and
interfacing that to the PIC. There was a design for a data logger in
the March 2008 issue of the "Elektor" magazine. The problem with this
design is that it is written in "MikroC" and this compiler is quite
expensive.
Les.
--- In p...@yahoogroups.com, "jvoytovich"
>
> Does anyone know what chips are used to provide the large memory size
> of the flash drive units (ie, 1GB range)? I built a project using an
> Atmel chip that was 8M in size, and that cost about $8. I wanted to
> build a datalog board with about 50MB on-board.
>
> Thanks.
>
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: Flash memory - jvoytovich - Oct 2 11:05:17 2008
The SD card is an interesting idea. I'll look up the interface
requirements for that device.
I should have listed more requirements for my original design. The
project has a USB host chip that allows a flash drive to be plugged
in, at which time the data would be downloaded onto the flash drive.
The internal memory would only be used for "temporary" storage. This
was a work project, and we had an order for about 500 units, so cost
was somewhat of an issue. We had hoped to keep the parts cost to
around the $25 range.
I read somewhere (this may not be totally correct) that NAND flash
technology was used in flash drives as it is cheap, but also has many
defective cells. The drive controller detects this and marks blocks as
bad. That's way flash drive total size varies somewhat. One lawyer
actually sued flash drive manufacturers because he only fit 3,998
songs on his drive instead of the advertised 4,000. Now you'll hear a
disclaimer with each ad stating that actual storage capacity may vary.
Some people are such idiots.
--- In p...@yahoogroups.com, "Les Jones" wrote:
>
> Hi,
> Have you thought of using an "SD" card (Or other flash card.) and
> interfacing that to the PIC. There was a design for a data logger in
> the March 2008 issue of the "Elektor" magazine. The problem with this
> design is that it is written in "MikroC" and this compiler is quite
> expensive.
> Les.
> --- In p...@yahoogroups.com, "jvoytovich" wrote:
> >
> > Does anyone know what chips are used to provide the large memory size
> > of the flash drive units (ie, 1GB range)? I built a project using an
> > Atmel chip that was 8M in size, and that cost about $8. I wanted to
> > build a datalog board with about 50MB on-board.
> >
> > Thanks.
>
------------------------------------
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requirements for that device.
I should have listed more requirements for my original design. The
project has a USB host chip that allows a flash drive to be plugged
in, at which time the data would be downloaded onto the flash drive.
The internal memory would only be used for "temporary" storage. This
was a work project, and we had an order for about 500 units, so cost
was somewhat of an issue. We had hoped to keep the parts cost to
around the $25 range.
I read somewhere (this may not be totally correct) that NAND flash
technology was used in flash drives as it is cheap, but also has many
defective cells. The drive controller detects this and marks blocks as
bad. That's way flash drive total size varies somewhat. One lawyer
actually sued flash drive manufacturers because he only fit 3,998
songs on his drive instead of the advertised 4,000. Now you'll hear a
disclaimer with each ad stating that actual storage capacity may vary.
Some people are such idiots.
--- In p...@yahoogroups.com, "Les Jones"
>
> Hi,
> Have you thought of using an "SD" card (Or other flash card.) and
> interfacing that to the PIC. There was a design for a data logger in
> the March 2008 issue of the "Elektor" magazine. The problem with this
> design is that it is written in "MikroC" and this compiler is quite
> expensive.
> Les.
> --- In p...@yahoogroups.com, "jvoytovich"
> >
> > Does anyone know what chips are used to provide the large memory size
> > of the flash drive units (ie, 1GB range)? I built a project using an
> > Atmel chip that was 8M in size, and that cost about $8. I wanted to
> > build a datalog board with about 50MB on-board.
> >
> > Thanks.
>
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )