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MMC
Comp.Arch.Embedded is a worldwide Usenet news group that is used to discuss various aspects of Embedded Systems development.
We found 169 threads matching "mmc"
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The most relevant threads are listed first
MMC modes of operation
2005-01-05 23:22:00
Hi all,
I hope someone can help me out with a simple question about interfacing
to an MMC/SD card.
I wish to talk to card via MMC mode. Does that mean that pin 1 of the
MMC card should be driven with a logic high signal, or should be it be
left floating?
I understand that by driving a lo...
about mmc device controller
budflora - 2008-04-24 07:36:00
Dear all,
I am studying mmc spec these days. And i'm trying to design a mmc device
controller, and want to integrate with a nand flash controller which has
been finished. of course, a processor is needed. i am wondering command
decoding and response handling and the implementation of MMC spec is ...Atmega16 and MMC
terry - 2004-11-07 01:26:00
In ATMega16, I want to ask how to use SPI with a MMC card.
I have seen that there are 4 pins in ATMega16 which implements SPI. They are
SS, MOSI, MISO, SCK.
For a MMC card, the 4 pin assignments are
1 CS
2 Din
5 SCK
7 Dout
Is the SS pin of ATmega16 connected to CS of MMC or else?
...SD / MMC on AT91SAM7S256
Peter Pippinger - 2007-08-21 17:24:00
Hello NG,
i have the SAM7-P256 DEV-Board from Olimex.
But if i open and compile the mmc demo - it doesn=B4t work.
http://www.olimex.com/dev/soft/arm/SAM7/MMC.zip
Is there something i have to change after downloading it?
Thanks for any help.
Regards,
Peter
...Re: about mmc device controller
2008-04-24 14:12:00
On Apr 24, 4:36 am, "budflora" wrote:
> Dear all,
> I am studying mmc spec these days. And i'm trying to design a mmc device
> controller, and want to integrate with a nand flash controller which has
> been finished. of course, a processor is needed. i am wondering command
> decoding ...Re: Any Tool to Write-Protect microSD? (or SD)
Paul Taylor - 2007-02-08 01:40:00
On Thu, 08 Feb 2007 06:00:42 +0000, Tom wrote:
> you will have to write your own
> software to access that particular register.
Some example code can be found on the internet for general writing to a
mmc with spi. Quickest route might be to start with that, to see how
others have done it...using mmc for voice recording
chimpi - 2008-12-17 06:35:00
hey folks,
i have been working on the construction of a voice recorder using memory
of MMC and ATmega 16 as the controller associated...i am using the MMC in
SPI mode... since the sampling rate of the data is quite high... so i dont
use any buffer memory before storing data to MMC, i keep the mmc...Re: about mmc device controller
budflora - 2008-04-24 21:12:00
> On Apr 24, 4:36 am, "budflora" wrote:
> > Dear all,
> > I am studying mmc spec these days. And i'm trying to design a mmc
device
> > controller, and want to integrate with a nand flash controller which
has
> > been finished. of course, a processor is needed. i am wondering
command
> ...MMC specification
Fonze - 2004-07-22 09:05:00
Hello,
I'me currently working on a embedded datalogger which writes data on a
MMC card.
the CPU is an MSP 430 from TI, communicating through SPI.
Does anyone have the complete MMC (multimedia card) specification?
Even version 2.2 would be sufficient for me...
I've looked for it a while, bu...Writing data to a sector of MMC card
Pelos @ Home - 2006-09-03 13:51:00
Hi,
I'm collecting and saving small amount of data (about 64 bytes) once per
5 minutes on MMC sector. I put my data into increment pointer in SRAM
memory, but I can't wait to fill 512B buffer. I have to save my data
(512B buffer) on each collected data due to power lost. If I fill 512B
SRAM...MMC cards, who created the standard behind them (if any)
The Eighth Doctor - 2005-03-16 17:48:00
Hello from the Eighth Doctor
One of my staff, with my blessing, is investigating the possiblty of using CF, or
MMC cards for file storage on an embedded system project that he's designing.
I know, (vaguely), who invented the first CF card, and who started the standard
behind them. We've got ...Where may I get a copy of MMC specification?
Kelvin @ SG - 2004-02-20 21:45:00
Hi, there:
Where may I get a MMC card specification? It seems mmca.org asks for $
in order to download the specs...but I don't want to pay that...
Kelvin
...Re: Need a SD (memory card) controller chip.
2006-12-10 11:25:00
In article , Stef wrote:
> In comp.arch.embedded,
> Peter Dickerson wrote:
> > "Stef" wrote in message
> > news:893c$45794128$54f63171$29655@publishnet.news-service.com...
> > >
> > > I think you've got it backwards. SD cards wil work in MMC slots in most
> > > case...miniSD, SD, MMC : some new questions
Kaushik - 2005-10-18 06:20:00
hi all,
i have gone through some of the questinos regarding miniSD, SD and MMC
on net. here is my set of questions:
1. what is terminal guard?( usually mentioned as a difference between
miniSD and SD)
2. does miniSD have write protection switch?
3. if no(to question 2), why is it called 'mini...CRC calculations for MMC card
2006-01-18 14:55:00
Hi,
I am developing an MMC driver using SPI mode.
The driver is already working with CRC checking disabled (default).
I would like to use or at least support (through a configuration
option) the generation and checking of CRCs.
I found in an application note from Sharp (for LH79520)
two C ...MMC LCD Interfacing in ATMega16
techie.embedded@gmail.com - 2006-10-27 17:42:00
Hi
Can someone lead me to some tutorial or some sample codes to write data
into my MMC, read & display onto LCD. I'm using an ATMega16 MCU & my
compiler is WinAVR.
thanks heaps.
techie.
...SD/MMC Diagnostics
Ram - 2006-08-13 10:12:00
Hi,
Im trying to write a test for SD/MMC card on power up.
As soon as the board gets powered up - i want to test if SD/MMC card
is working fine.
How does one go about doing it?.
1) I am able to detect and initialise the card and read the Card
details like vendor id...
How ...SD/MMC card driver for LPC2378
Hima - 2008-04-04 14:01:00
Hi,
I´m trying to write a block-driver for mmc/sd cards on the LPC2378, using
the 4-bit mode.
Does anybody have some experience in writing such a driver and
is there any sample code available to use as a starting point?
Regards,
Hima
...Temporizzazioni MMC
Haldo - 2005-06-14 13:51:00
Ciao a tutti!
Qualcuno ha un'idea delle temporizzazioni necessarie per le memorie MMC?
Mi spiego meglio, qualcuno conosce il transfer rate per una scrittura
continua su questi dispositivi? (riferendosi a una MMC "media" odierna,
da 512MBytes).
Vorrei realizzare un datalogger, che abbia una ...MP3 files on MMC
kvpatel_2000 - 2005-06-01 08:27:00
I am using Atmel AT8xC51SND1C and would like to read and write MP3 files t
MMC cards. Can any one point me to link or project that doing anythin
similar to this. I would like to use the finished code if possible.
This message was sent using the comp.arch.embedded web interface o
www.Em...MMC stream write rate
2006-09-21 04:38:00
Dear All,
What's the max practical stream write rate on MMC card ?
Which brand is the fastest one ?
Kind regards,
Yuri
...SD-MMC writing FAT
Rocky - 2006-12-30 07:53:00
Hi All,
I am starting some work that would be using an SD card (in MMC-SPI
mode) and I was hoping to use a PIC or similar low memory chip.
The idea was to use Lewin Edward's DOSFS (www.zws.com) as it only
requires about 1KB RAM.
The problem is that according to the SANDISK spec one can do...FAT16/32 system on a MMC card
terry - 2004-11-07 23:08:00
Hi,
Could anyone give me source code example to implement FAT16/32 file
system on a MMC card? I used Atmega32.
Thanks!
...SD / MMC - extension kit ?
Martin Maurer - 2004-02-14 11:50:00
Hello,
can someone tell me if the following exists:
I want to test / debug / monitor a SD / MMC - card. Usually the SD card goes
completely into the slot. Is there some kind of extension, with some test
points for each pin, and perhaps again a SD connector for the real card. It
is a bit diffi...Re: SD CARD
Repzak - 2005-05-20 18:24:00
"Mirarefin" wrote in message
news:Hb2dnZu1ufj7ihPfRVn_vA@giganews.com...
> Hi.
> Iam starting to work with SD card.
> but I have some questions.
>
> I am reading sandisk SD manual ;tell me if it is enough to communicate
> data with SD card and if not direct me to the necessary do...Migrating from MMC to SD card
Stef - 2004-10-28 06:24:00
Hi all,
We currently have a (client's) product that uses an MMC (SPI mode) for
datastorage, the client would like to change this to SD card.
After searching the web, I did find the SD card simplified physical
layer spec, but not much else. The www.sdcard.org site keeps giving me
timeouts. I...Embedded Filesystems Library problem...
Pawel K - 2007-06-22 09:23:00
Hello,
I use EFSL v0.2.8 stable from http://efsl.be with ATMEGA 128.
I can mount FS, open & write/read file but i have 1 problem. First close
file, unmount fs, remove MMC from socket.
I put mmc in socket, initialise file system again and
my program freeze, what wrong?
--
--
Pozrdawiam
P...File system requirements for SD and MMC cards?
Kaushik - 2005-10-13 01:31:00
Hi all,
I would like to use SD and MMC cards on an ARM evaluation board with
AMX os. What are the requirements that a file system should have to
support these devices? for eg:ECC calculation, Multivolume., etc. are
these any special features which they have to support?(for eg., to
support a ...Re: AVR + USB Memory stick
Carsten - 2005-12-26 11:38:00
On 26 Dec 2005 08:14:33 -0800, "larwe" wrote:
>
> > I need to log around 300MBytes of data. USB memory sticks are cost effective
> > storage mediums. Is there a simple way to interface a USB memory stick with
> > an ATMEL microcotroller?
>
> No. Use a CompactFlash card.
Use a SD/M...SD Card License question
dom - 2007-11-18 07:10:00
Hello,
I'm thinking about adding a microSD Slot to a very tiny device.
The Problem is, that www.sdcard.org seems to charge a lot of "protection
money" if you implement anything with SD Cards that's going to be sold.
(something like $3000/year)
The device does not need ANY specific SD feature...What NAND flash do people use?
Alan Nishioka - 2008-03-24 17:15:00
I am currently using an MMC/SD card that I want to replace with a chip
(for simplicity, no socket, price).
Is there any popular NAND flash device that I might replace it with?
I have found:
1. SST NANDrive: IDE interface, 128MB-8GB
2. ONFI (Hynix, Intel, Micron, ie. everybody but Samsung) NAN...MMC timings and write speed
Haldo - 2005-06-14 13:41:00
Hi all!
I'm just beginning a new project which involves a PIC microcontroller
and a MultiMedia Card.
I was wondering which are the timings for these cards for a sustained
write. I need to store a data stream at 150KBytes/sec on the card, but I
can't figure out what the minimum write speed ...Re: SD Card driving recipe desperately needed / SanDisk problems
Stef - 2007-02-19 03:46:00
In comp.arch.embedded,
analox wrote:
> Hey all,
>
> I am having problems using Sandisk SD cards in my embedded
> application. (SPI mode, one data line, interfacing consists of
> CS,CKK,DI,DO)
> Many other makes (eg Kingston) work fine here, but the customer wants
> Sandisk (due to ...Re: Can anyone identify the manufacturer of this Chip ?
Antti - 2007-06-21 07:09:00
On Jun 21, 1:01 pm, Jan Panteltje wrote:
> On a sunny day (Thu, 21 Jun 2007 17:27:08 +1000) it happened Mark McDougall
> wrote in
> :
>
> > Gene S. Berkowitz wrote:
>
> > > According to the manufacturer (Century Corp, Japan), it stripes the data
> > > across the multiple ca...Re: Help writing a USB driver
Tom Lucas - 2006-10-10 12:04:00
"Mercy" wrote in message
news:1160494713.481397.164650@h48g2000cwc.googlegroups.com...
>
> larwe wrote:
> > You don't want to do this. Use a removable flash storage medium like
> > SD.
> >
> > Implementing host-side USB is not a trivial exercise and should only
> > be
> > under...Re: ARM7 with external memory
Frank-Christian Kruegel - 2006-05-02 12:21:00
On Tue, 2 May 2006 17:16:54 +0200, "Henrik [6650]" wrote:
> My reason for requesting large flash/ram sizes is that I need to do quite a
> lot of dataprocessing and storing. I plan on using SQLite and use SPI flash
> for storage. For the GUI I plan to maintain rather large amounts of
> datao...sdcard access problem to lpc2378
raveendran - 2008-09-02 08:00:00
Hi,
i am new to arm lpc2378 processor. i want access sdcard in lpc 2378
processor. i downloaded example code for version chaN 0.05/nxp 1.4/mt 0.3,
i am running this code and given command to processor- di 0 :command for
initialization of sdcard i am getting this output. pls help me what is the
pro...Re: RF link to embedded system
Tom Lucas - 2006-04-13 10:11:00
"Marian Staw" wrote in message
news:e1jhue$fcr$2@atlantis.news.tpi.pl...
> Hello.
>
> I developing embedded system based on ARM7 core and i want to transfer
> lots of data(about 128 MB)from system to PC via RF link.
> Do you know good RF module with min. 500kbps date rate and 10 m ...File systems on SD card details.
Ted - 2004-12-25 20:41:00
Hello,
Id like to know more about filesystems on SD/MMC cards in detail.
Can anyone suggest the right procedure to learn how to access the SD
cards for storing retrieving information..
Thanks in advance.
...3.3v <> 5v interfacing @ 15Mhz
Alison - 2006-11-25 06:12:00
Hi,
Please may I ask for assistance? I need a reliable method of interfacing an
SPI SD/MMC card to a dsPIC. At the moment I'm using a 1k8/3k3 voltage
divider on the 5v ----> 3.3v signals, and connecting the 3.3v ----> 5v
signals straight to port.
It's working ok upto about 3-5Mhz, with ...