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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0
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1answer
64 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
108 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 ...
5
votes
5answers
314 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 ...
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0answers
29 views

Running a program from SD card - Zynq 0720

I've been trying to test a simple hello world program on the Zynq 0720 with a TE0701-03 carrier board. I have followed tutorials online on how to do this but simply, I have created a boot image for ...
0
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0answers
31 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
80 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
202 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
148 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
159 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
72 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
168 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
411 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
198 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
153 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
0answers
246 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
173 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
187 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
83 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
215 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
62 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
0answers
99 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
252 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
68 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
335 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
146 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
123 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
195 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
2answers
2k 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
356 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
186 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
274 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 ...
1
vote
0answers
153 views

Data logger using ARM 9 (Friendly ARM Mini 2440 kit)

I have been working on this kit for the past month and have simulated some basic programs using Keil (non os using just C). I was assigned a project of making a data logger which stores the data in ...
3
votes
1answer
304 views

Ferrite bead for use for filtering a microSD card's Vcc

I am hoping to use a microSD card in an AVR project and am just trying to find values for all my components. However, I am not sure what value of ferrite to use here. The few microSD schematics that ...
-1
votes
1answer
84 views

Easiest & cheapest way to use embedded filesystem on SD card [closed]

I want to build a cheap, basic project which logs data to an SD card that can be removed and read using a normal card reader in a computer. Requirements are fairly basic so performance is not ...
4
votes
1answer
62 views

SD Comms Resetting Processor

I have implemented an SD/FAT combination on a Renesas RL78/G13 processor. The SD card is being driven using SPI. The code has been proven to work on two custom target boards using a 2GB card - the SD ...
7
votes
1answer
562 views

Does an SD card in SPI mode respect chip select/slave select? Seems to be resetting in my application

I have an application where I have a microcontroller (NXP LPC1343) which is connected to an FPGA via 16-bit SPI. There is also an SD card using the same SPI port (MISO/MOSI) but with a different CS/SS ...
1
vote
1answer
146 views

Renesas RL78 SPI Baudrate Change

I am using an Renesas RL78 and SPI to communicated with an SD card. I have the driver working using the single command Baudrate of 400kBaud when sending both commands and data. Of course, this is ...
2
votes
2answers
325 views

Has anyone seen power cycle corruption in industrial SD cards?

I am using a micro SD card in a new embedded Linux system (choice of SD was not mine, was made by the hardware guys). I have seen a problem before where power cycling of a system without doing a ...
0
votes
2answers
380 views

What Happens when Read or Write Failures Occur on SD Card?

I have been happily backing up and copying SD (including microSD and SDHC) cards from a Linux PC using the following commands: ...
1
vote
1answer
183 views

SD card socket with MMC and Atmel

I'm trying to include an SD card slot in one of my designs. The whole SD format seems confused at best, and I can't seem to find a definitive answer to what I need to wire up. Apparently the easiest ...
2
votes
2answers
1k views

Controlling an LED's intensity with a text file from an SD card

I want to control the intensity of an LED by reading a text file. Here is an example of a text file: 255,100,255,50,100,20,10,200,50,90,85,200,0,0,0,255 My ...
1
vote
1answer
194 views

Arduino - Log Data to SD Card with Computer

I have an Arduino R3 Uno and I was wondering if I can log data to it using a computer's SD card slot, since I don't have an SD card shield. Any suggestions? Thanks!!!
3
votes
1answer
185 views

Problem stacking accelerometer and SD card shields on Arduino UNO

I have an ADXL345 accelerometer on a Makershield stacked on top of a Seeed SD card shield. Both of those are stacked on an Arduino UNO R2. I've got each working individually, but when stacked they ...
4
votes
1answer
991 views

How to properly open and close files “inside” a member function? [closed]

I am using Arduino Uno and the Ethernet Shield with a 2GB SD Card. I have the following working code intended to be used to write data on the SD Card (note: the SD Library is properly initialized and ...
2
votes
0answers
646 views

Corrupted files generated by Arduino with SD library. How to avoid that?

I have a sketch that runs on an Arduino Ethernet (that comes with an SD card reader and, of course, an Ethernet interface). There is a unique place in this sketch where I write to a file on the SD ...
6
votes
1answer
290 views

Occasionally the first byte of data from an SD card SPI read is bad

The device I am developing is an SD card storage add-on to a retro computer, SanDisk Ultra II 1.0 GB SD card in an SD card socket (I have no idea if the brand is significant, it just happens to ...
-3
votes
2answers
310 views

Small device that runs Linux [closed]

I want to make a small device that boots Linux off of an SD card for ARM or x86. I am trying to build this from scratch. I downloaded Linux (kernel.org) and compiled it on Ubuntu. What kind of SD ...
15
votes
2answers
361 views

Is SPI safe to be interrupted?

I'm writing to a microSD card from within my firmware, but it's the lowest priority task, so it can be interrupted by other tasks while it's in the middle of reading/writing. Now suppose I ...
5
votes
1answer
519 views

Diagnosing SD card failures

I have an embedded device using an SD card. Occasionally I see SD cards fail, and I need to understand the failure mode. Are there tools, perhaps for specific manufacturers, that help me understand ...
1
vote
1answer
111 views

MicroSDHC “WP_VIOLATION” recurring Error

I have a few 8 gigabyte MicroSDHC cards that are being used as the nonvolatile storage in a data logging hardware application. The data being stored is going to be in a raw format, rather than in a ...