MMC in Comp.Arch.Embedded
Comp.Arch.Embedded is a worldwide Usenet news group that is used to discuss various aspects of Embedded Systems development.
We found 69 threads matching "MMC"
You are looking at page 1 of 2.
The most relevant threads are listed first
So far in May, you have voted 0 times ou of a total of 20 votes by the community.
Please help us clean the archives from unuseful discussion threads by using the voting system! Details here.
budflora - 2008-04-24 07:36:00
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 ...
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
Is the SS pin of ATmega16 connected to CS of MMC or else?
Started by terry
9 years ago
Peter Pippinger - 2007-08-21 17:24:00
i have the SAM7-P256 DEV-Board from Olimex.
But if i open and compile the mmc demo - it doesn=B4t work.
Is there something i have to change after downloading it?
Thanks for any help.
chimpi - 2008-12-17 06:35:00
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...
I'me currently working on a embedded datalogger which writes data on a
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...
Started by Fonze
9 years ago
Pelos @ Home - 2006-09-03 13:51:00
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
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 MMC card specification? It seems mmca.org asks for $
in order to download the specs...but I don't want to pay that...
Started by Unknown 6 years ago
In article , Stef wrote:
> In comp.arch.embedded,
> Peter Dickerson wrote:
> > "Stef" wrote in message
> > news:email@example.com...
> > >
> > > I think you've got it backwards. SD car...
Kaushik - 2005-10-18 06:20:00
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...
firstname.lastname@example.org - 2006-10-27 17:42:00
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.
Ram - 2006-08-13 10:12:00
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...
Hima - 2008-04-04 14:01:00
IÂ´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?
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,
Vorrei realizzare un datalogger, che ...
Started by Haldo
8 years ago
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
Started by Unknown 7 years ago
What's the max practical stream write rate on MMC card ?
Which brand is the fastest one ?
Rocky - 2006-12-30 07:53:00
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...
Could anyone give me source code example to implement FAT16/32 file
system on a MMC card? I used Atmega32.
Started by terry
9 years ago
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...
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
Started by Stef
9 years ago
Pawel K - 2007-06-22 09:23:00
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?
Kaushik - 2005-10-13 01:31:00
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 ...
dom - 2007-11-18 07:10:00
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 ...
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...
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 ...
Started by Haldo
8 years ago
Umar Waqas - 2010-05-14 02:54:00
I am porting ARM PL180 SD/MMC controller. Its is working fine in
initialization, Read OCR, CSD etc. It also reads the block fine. Its
write block works fine for some blocks but then i receive TX under run
error in the status register. I am using block write.
I have tried the followin...
raveendran - 2008-09-02 08:00:00
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
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.
Started by Ted
8 years ago
Alison - 2006-11-25 06:12:00
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,...
engineer666 - 2008-01-16 08:59:00
anyone already worked with mmcm kingston ? im trying to put this working
several days, but i think that im losing this battle.
i sent the mmc commands but i havent response from memory... im using the
same circuit on proteus vsm and it works fine.
i need some help..
Anyone know of a readily available commercial product which can log
RS232 data & store it on a removable flash card i.e.. SD /MMC/ XD etc.
The instrument will be writing ASCII CSV strings.
I have a cct etc for an AVR but I need to buy a few in a hurry & just
have it work....
Started by Don
8 years ago
Pelos - 2007-01-25 04:06:00
I have problem with transmission between ARM and MMC/SD on my board.
I tested with 16MB SD from Panasonic and 256MB Kingston MMC.
Here is my board http://twarm.pelos.pl/viewtopic.php?t=2
I use kernel 2.6.19 with patches from maxim.org.za
The connections are:
8 -> PB3
zaheershamsi - 2007-07-30 07:10:00
Is it possible to write few bytes of data to MMC instead of writing a
block of 512 bytes. But remember I am asking it for SPI mode.
I know it is possible in Multimedia Card Mode but I am using SPI
This is the code which I am following for writing single block.
layaghi - 2005-12-31 09:43:00
I have a AT91RM9200 evaluation kit (AT91RM9200_EK).
I want to know how could I use any devices other than DataFlash card for
booting the board and downloading the Win CE image?
when I say "any devices other than DataFlash card" I mean onboard parallel
flash or the MMC,SDcard and so o...
wzab - 2008-05-10 17:19:00
I'm just working on the open source GPS logger with voice recording (to
facilitate recording tracks for the http://www.openstreetmap.org project).
The current architecture includes:
GPS module - http://www.f-tech.com.tw/datasheet/GPS/FGPMMOPA2.pdf -
first tests show, that it perform...
Brian Fairchild - 2005-09-14 07:56:00
Has anyone come across a device which will allow you to replace a
standard PC 1.44Mb floppy drive with something which will take
CF/SD/MMC cards. It'll need to emulate a floppy drive as there is no
chance to rewrite the embedded systerms hardware.
I've found the Fuji FD-A2 but that seems to ne...
Peter Dickerson - 2007-09-02 08:07:00
I have a SD card connector attached to a Sharp LH75410 ARM processor via SPI
using the SSP hardware. This has been working for ~9 months with a variety
of SD and MMC cards. However, recently I have found a couple of SD cards
that don't seem to work. I don't mean they don't initialize but that ...
solarst - 2009-04-03 06:31:00
Lots of questions, I hope someone can guide me in the right direction!
I'm looking for some help in designing a system that can take data from an
image sensor and store it in some sort of MMC/flash memory. It will be
part of a wearable device for monitoring diet/activity constantly during
I am having trouble finding SPI flash RAM with capacities greater than 4
MB (64 Mb). I know that there are MMC cards with 64 MB (256 Mb)
capacities, that can easily be interfaced to SPI, but I would like to
find the RAM without the packaging.
amerdsp - 2007-07-29 22:31:00
I am trying to design and implement a very simple camera that would
capture VGA quality images and store them to flash memory such as SD
I am seeking the advice of the experienced people out there about
the recommendations for a microcontroller and image sensor