using mmc for voice recording

Started by chimpi in comp.arch.embedded9 years ago 1 reply

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...

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 initialized to a page and keep on sending the samples to the card... and when a page is full ...a n...


Re: about mmc device controller

Started by budflora in comp.arch.embedded9 years ago 3 replies

> 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 > > ...

> 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 and response handling and the implementation of MMC spec is all > > implemented j


AT91RM9200 - problem with SD/MMC

Started by Pelos in comp.arch.embedded11 years ago 2 replies

Hi. 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...

Hi. 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: MMC CPU 8 -> PB3 7 -> PA29 6 -> GND 5 -> PA27 4 -> +3v3 3 -> GND 2 -> PA28 1 -> PB5 9 -> PB4 I added pullup (1


about mmc device controller

Started by budflora in comp.arch.embedded9 years ago

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...

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 all implemented just by hardware or processor will share part of job. which solution is better? I ho...


MMC specification

Started by Fonze in comp.arch.embedded13 years ago 2 replies

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...

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, but couldn't find it. I saw sandisk doc, but I have a problem which needs precise timing specs which...


Atmega16 and MMC

Started by terry in comp.arch.embedded13 years ago 3 replies

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,...

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? Thanks!


Writing few bytes to MMC

Started by zaheershamsi in comp.arch.embedded10 years ago

Hi everybody! 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...

Hi everybody! 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 protocol. This is the code which I am following for writing single block. /*-------------------------------------------------------------------- MMC Reset, MMC Initialize, 1 block ...


SD / MMC on AT91SAM7S256

Started by Peter Pippinger in comp.arch.embedded10 years ago 1 reply

Hello NG, i have the SAM7-P256 DEV-Board from Olimex. But if i open and compile the mmc demo - it doesn=B4t...

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


Temporizzazioni MMC

Started by Haldo in comp.arch.embedded12 years ago 3 replies
MMC

Ciao a tutti! Qualcuno ha un'idea delle temporizzazioni necessarie per le memorie MMC? Mi spiego meglio, qualcuno conosce il transfer rate per...

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 banda di 150KBytes/sec in scrittura sulla MMC, e mi chiedevo se con queste memorie la cosa fosse ...


MMC cards, who created the standard behind them (if any)

Started by The Eighth Doctor in comp.arch.embedded13 years ago 1 reply
MMC

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...

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 a supplier selected for both the cards, and the adapter. But the MMC card is a tricky beast. We'd ...


SD/MMC Diagnostics

Started by Ram in comp.arch.embedded11 years ago 1 reply
MMC

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...

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 does one read/write into the card without a block driver/fs support?. Any ideas - Suppose i w...


Where may I get a copy of MMC specification?

Started by Kelv...@ SG in comp.arch.embedded14 years ago 5 replies
MMC

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...

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


MMC LCD Interfacing in ATMega16

Started by tech...@gmail.com in comp.arch.embedded11 years ago 6 replies

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 &...

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 card driver for LPC2378

Started by Hima in comp.arch.embedded9 years ago 4 replies
MMC

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...

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


MP3 files on MMC

Started by kvpatel_2000 in comp.arch.embedded12 years ago 1 reply

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...

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.EmbeddedRelated.com


Writing data to a sector of MMC card

Started by Pelo...@ Home in comp.arch.embedded11 years ago 4 replies

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...

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 buffer - I use next MMC sector. I use SPI mode and sector data is set to 512 bytes. I need to inv...


MMC stream write rate

Started by Anonymous in comp.arch.embedded11 years ago 1 reply
MMC

Dear All, What's the max practical stream write rate on MMC card ? Which brand is the fastest one ? Kind regards, Yuri

Dear All, What's the max practical stream write rate on MMC card ? Which brand is the fastest one ? Kind regards, Yuri


FAT16/32 system on a MMC card

Started by terry in comp.arch.embedded13 years ago 5 replies

Hi, Could anyone give me source code example to implement FAT16/32 file system on a MMC card? I used Atmega32. Thanks!

Hi, Could anyone give me source code example to implement FAT16/32 file system on a MMC card? I used Atmega32. Thanks!


SD-MMC writing FAT

Started by Rocky in comp.arch.embedded11 years ago 6 replies

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...

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 sector writes of 512 bytes, but that an erase will operate on 32 sectors. This means that to upda...


Migrating from MMC to SD card

Started by Stef in comp.arch.embedded13 years ago 12 replies

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...

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 also get the impression that I will need to become a member before I can view any usefull stuff on...