Tagged Questions

Secure Digital (SD), a memory card standard. Has multiple form factors (Standard, MiniSD and MicroSD/Transflash) and multiple capacity ratings (SDSC, SDHC, SDXC). Also extends to SDIO, which allows peripherals in sd form factor to attach to a host, similar to USB.

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2
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0answers
54 views

Conformal coating and micro SD card sockets

I have a embedded computer design which uses a low profile micro sd card socket as an extra option in addition to an on board solid state disk as storage/booting mediums. In manufacture the board is ...
0
votes
2answers
51 views

A NAND flash sector suddenly goes bad. What happens to the file using that sector?

I can read a lot about how NAND flash can be checked for bad sectors, which are flagged and won't be read/written to in the future, but happens at the moment a sector goes bad? Any file that was using ...
0
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1answer
49 views

Retrieving data recorded by an IoT sensor

If an IoT object records data (accelerometer, gyroscope, ...) in memory, what would be the smartest way to retrieve these data after, let's say, 2-3 days? Store in JSON format on an SD Card? Store ...
1
vote
1answer
75 views

SD Card 4-bit Mode License

The Micro (STM23F4xx) I'm using happens to include a SDIO peripheral that is supposed to support the 4-bit parallel bus SD Card protocol. I'm aware that the SD Association holds patents on the ...
0
votes
1answer
81 views

SD Card Access Library

I am accessing my SD card using SPI. But I've found this to be slow and I am also sad that when there is a faster protocol already supported by my SD card I am using a slower version. Is there a C ...
1
vote
1answer
102 views

How to write on SD card smaller than sector size (512 bytes)

I am writing a library for FAT file system management on STM32 for learning purpose. I want to use a SD/MMC card connected through SPI bus. I do some tests with a disk image on PC (I emulate ...
0
votes
2answers
215 views

Interfacing FPGA and a storage device

I'm doing this project called "High data rate logger". The requirements for this project is to sample the 2 analog signals simultaneously. 2x channel 14-bit ADC Store 60 MSps (mega samples per ...
2
votes
2answers
153 views

Writing to SD Card cheaply

So, here's the scenario: I have an Arduino and an SD card. Unfortunately, I don't have one of the fancy shields, and I don't have the time to order one. As we know, Arduinos run on 5V, and SD cards ...
1
vote
1answer
199 views

How to add a password to an SD card?

I want to build an embedded system that reads external data and logs it to a file saved in an SD card. However this system is accessed through a password and I want either the SD card or the file in ...
1
vote
2answers
259 views

How about soldering microSD card directly to PCB?

I know that microSD cards are typically not designed for this type of use, but has anyone tried this? Would it be possible in production ( >1000 units), that is, would any PCBA service be able to do ...
0
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2answers
100 views

Buffer management for SD card in SPI mode

I'm looking into implementing storage of large audio files onto an SD card. I'll be using SPI to access the card to avoid any patents by the SD card mafia. I'll be generating a lot of data, about ...
0
votes
0answers
77 views

Is a file system something that is implemented in hardware or software?

The context of this question is that I would like to be able to take an SPI flash IC and store audio files on it. The reason I need a file system, specifically FAT, is because I'm using an OGG Decoder ...
0
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0answers
73 views

Cost effective high quality audio recording & playback design

For a few days now, I'm looking for a cost effective way for recording a few minutes of audio in high quality 44.1KHz @ 24bit and be able to save a bunch of these "tracks". I thought to use SRAM + ...
0
votes
1answer
103 views

Designing Flash Memory to USB Mass Storage bridge

I've been scratching my head at this for a while now. I'm trying to build a device that records audio using a VS1053 encoder IC to some sort of SPI flash memory. I want to be able to download the ...
1
vote
2answers
331 views

Difference between 1-bit, 4-bit and 8-bit SDIO

Please help me understand the significance of 8-bit SDIO over 1-bit and 4-bit SDIO. Let me know the pros and cons of each type. Wiki or SDIO specification document does not discuss this.
2
votes
3answers
82 views

Is the slide-lock on an SD card optional?

When enabling the write lock on the side of an SD card, is the write protection a physical limit on the SD card, or a flag sent to the reader or OS telling it to please not write?
5
votes
3answers
1k views

Is it possible to use an SD card without a file system?

I'm doing a project on PIC, which needs a large amount of memory to store data. I want to use an SD card as the memory storage element. I don't want any type of file system. I googled the interfacing ...
2
votes
2answers
225 views

Interfacing 3.3V SD card MISO output to ATmega328P

I am attempting to write data to a SD card from a ATmega328P micro controller with no luck. I've narrowed down the source of the problem to the MISO output of my SD card breakout board, which doesn't ...
2
votes
0answers
144 views

SPI SDHC Initialization Timing Problems

I Have a 16GB Wi-Fi SD HC Card from Transcend. I try to initialize the card via SPI using an Arduino Uno, sending CMD0, arg: 0 , CRC: 0x95 response:0xFF but the expected response ...
2
votes
1answer
315 views

Low power temperature logging to an SD card

I want a make a low-power data logger, for now just to read a digital temperature sensor (DS18B20) and write the data to an SD card. The device will be asleep most of the time and just wake up from ...
0
votes
1answer
222 views

The difference between storage patterns in RAM or SD cards from EEPROM [closed]

I have used EEPROM to store data in embedded systems. I would like to know about the pattern of RAM and SD cards which were used to store data. Is it that complex in terms of using RAM or SD cards? I ...
4
votes
2answers
263 views

MicroSD card won't return any data on read command

I just want to clarify with everyone that I have exhausted all of my search options looking for an answer, and still cannot find the answer to my problem. I am trying to interface a micro sd card ...
6
votes
5answers
614 views

Why is data stored on a NAND chip irretrievable if cracked?

All data recovery companies, regardless of skill, unanimously say that if the memory chip of a device has just a hair line crack, data recovery is impossible. Not unlikely, not expensive, but ...
0
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0answers
70 views

Codec to Audio Processing Chip to SD Card

I posted a previous question about a project I am working on that will take a microphone output, send it through this codec and output the now digital signal via the SPI, process it using this audio ...
1
vote
1answer
121 views

Does MCU RAM size affect quality of WAV read from SD?

I'm planning to build a cheap and compact WAV audio player that reads audio from a Petit-FatFs microSD card. The Petit-FatFs filesystem is designed for use with devices with less than 512B RAM. My ...
1
vote
1answer
277 views

Designing a large 7-Segment display

I'm trying to design a product that have the following features for mass production, and I'm asking from your experience, how to get the lowest price for the components, quality of the chips in terms ...
1
vote
0answers
282 views

Arduino with RFID and SD [closed]

I want to duplicate an RFID card. Everything except for that what have an only read state. I thought: I save all the data of the card (which one I want to duplicate) on an SD card with an RFID RC 522 ...
1
vote
2answers
837 views

How can I hardware protect a microSD from writing to

I have a beagle bone black board and I want to make the card read-only so no modifications go to the microSD card. How can I achieve that? I have searched over internet for this. SD card have a ...
1
vote
2answers
97 views

6 way switch to USB card reader

I am looking for a way to redirect 6 pcb traces with a push of a single button. There is micro controller with a SD card connected and I would like to access the SD from a computer without needing to ...
4
votes
1answer
370 views

SD card access slows down with many files

I'm working on a data logger application using a MSP430F5529 running at 2 MHz and a SD card using FatFs. The SPI interface is already running at maximum frequency. However I am seeing very erratic ...
0
votes
1answer
2k views

Send SD data connected to Arduino to a Webhost using FTP [closed]

Sorry, I'm not very expert in drawing schematics, so this is the best I can do! I want to connect my arduino to GSM/GPS Shield offered by Cookinghacks.com ...
0
votes
2answers
396 views

STM32 custom bootloader: how to verify the firmware?

Using a custom SDIO/FAT in the application bootloader for a STM32 chip, is it possible to make the jump from the bootloader to the new firmware fail-safe? I would like to verify the new firmware ...
2
votes
1answer
364 views

Capacitor charging-like signal on SPI port's MOSI line

I'm using Texas Instruments Tiva C Launchpad to communicate with a micro SD and micro SDHC cards. The development board uses TM4C123GH6PM chip and I'm using TI RTOS's FatFS example for the Launchpad ...
2
votes
1answer
486 views

STM32F4Discovery, an HTTP server and a web page on the SD card

I have an STM32F4Discovery board, and I have implemented an HTTP server on it using the LwIP v1.41 stack. I also have implemented a microSD card reader with SDIO and FatFs, and USB FS as a mass ...
1
vote
2answers
419 views

Connect a microSD reader to a LilyPad USB, where are the digital ports?

I am attempting to connect a microSD breakout board to a LilyPad Arduino USB. The microSD board has previously been connected to an Arduino Duemilanove. In the Duemilanove setup, the following ...
2
votes
3answers
306 views

Recognizing low-pass filters

Does the capacitor in this circuit serve as a low-pass filter? The premise of the circuit is to be a small SD card based music player. The write up, Simple SD Audio Player with an 8-pin IC, says ...
1
vote
1answer
148 views

Is Atheros AR6102 all I need for my Wi-Fi SD card reader?

I was recently asked to create an iPhone app to allow the user to view, download and remove photos from an SD card. We can't use the card reader originally chosen, and for some reason I thought it ...
1
vote
2answers
372 views

Why does Arduino SD card module only work when multimeter attached?

I have an Arduino Mega and the SD card module found at this link: http://www.ebay.com.au/itm/SD-Card-Module-Slot-Socket-Reader-Arduino-ARM-MCU-Read-And-Write-/180868021964#vi-content I am using this ...
-1
votes
1answer
82 views

3g internet,sms unit and sd card unit [closed]

I am writing down the requirements i need to make a simple device which uses a micro-controller.The plan is simple.I have split the device core components into two. Component 1 ...
2
votes
2answers
146 views

Bigger resistors in place of a level shifter on a SD reader?

This item, a MMC/SD card reader module with 3V3 LDO and 10k pull-ups, has a schematic with an interesting tidbit in a big red box: Change R3, R4, R5, R6 resistance [from 2R7] to 330-470 [ohms], ...
6
votes
1answer
307 views

How to make a device in miniSD or microSD form factor?

I would like to design and get produced a device in miniSD or microSD card form factor. This is not actually a memory card, it just uses that connector. There are other devices like that, for ...
0
votes
0answers
89 views

Which microSD card socket is compatible with -40 … +70°C temperature range?

I have an industrial-grade microSD card, which is specified with a temperature of -40 ... +70°C. I need a push/push socket or similar socket with locking functionality. I searched for such a socket, ...
5
votes
2answers
769 views

Micro SD card power circuit failure

Description I am designing a system in which there's a circuit that controls the power applied to a micro SD card (enable/disable). The circuit is the following: The power control circuit is done ...
0
votes
0answers
214 views

Sniffing SD-card

I have the BeagleBone Black and HackHD camera. The camera stores its video on an SD card. How would one go around to pick up a file being written to HackHD SD card on BeagleBone (or any other embedded ...
1
vote
0answers
176 views

Voltage Translator (74HC4050) Voltage Fluctuations

I have a simple circuit with a simple problem that I just can not fix. I have a 74HC4050D hooked up to an SD card. I have a 0.1uf on the 5V line and 2.2uf on the 3.3V line. Whenever a signal is sent ...
0
votes
3answers
346 views

Why do we send some dummy data before sending any command to a microSD card?

I am interfacing a microSD card with a microcontroller. The following code snippet is taken from Application note 189 (AN189), MMC DATA LOGGER EXAMPLE on page no. 30. The MMC_Command_Exec() basically ...
4
votes
3answers
4k views

What is the correct command sequence for microSD card initialization in SPI?

I am trying to interface a microSD card (2 GB, Kingston, Sandisk) with a Silicon Labs C8051F931 controller. I am very much confused about the sequence which I have to follow for initialization. ...
1
vote
1answer
502 views

Mass storage mode for an SD card connected to a MSP430G2553 chip?

Right now I have a program that stores values obtained from the on chip ADC to a SD card. The card is connected like the diagram shown in this PDF: http://www.ti.com/lit/an/slaa281b/slaa281b.pdf I ...
0
votes
0answers
289 views

SD Card for Two Devices at Once - Possible?

Is it possible for an SD card to be used by two devices at once? In this scenario there is one device that has an SD slot and it periodically writes files to the card in its slot. I need to find a ...
-1
votes
1answer
355 views

Micro SDHC 32GB -> USB -> Arduino

The majority of Arduino Projects I've seen that involve using an SD card use 1 pin for ground and 4 for communicating and 1 for powering(3.3v)(if I'm not mistaken), when you insert said card into an ...