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

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1answer
50 views

how can i make programmable DVR [on hold]

I want to make a device that records video and saves it to a micro SD card but I also want to be able to do many things with the video I save for example; the device will always record even when the ...
-5
votes
0answers
42 views

Facing issue in writing Lower sectors of SD card [on hold]

I'm using SD card for data storage. If I start writing data from 10th sector of SD card when I reach 25th sector my 10th sectors data start corrupting. But same data storage I tried with higher sector ...
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votes
2answers
66 views

LEDs on 3.3V serial and sd card select lines

How would i go about connecting indicator LEDs to the serial lines from my MCU(a Parallax Propeller) to a MAX3232 and the chip select line for a SD card? I want the LEDs to light up when the lines are ...
0
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1answer
79 views

Meaning of micro-sd card symbols

I hope this is the right stackexchange site to ask this question. I'd like to now the meaning of these symbols, visible in the front of two different micro sd cards of the same model: Backgroung (...
0
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0answers
56 views

Atmel ARM, USB, and an SD Card as a MSD?

I'm currently trying to run the SAM L21 as both a CDC and an MSD over USB. Thankfully there is example code here to get me started. I can move files into the on-board ram just like any other storage ...
0
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0answers
26 views

SDHC initialization problem

For days I work on this and I have no solution. My ACMD 41 constantly returns 0x01. Here's my code. Can someone help me with this, I really need someone who worked on this. ...
2
votes
0answers
271 views

Did I just break an SD card Size Adapter with software? [migrated]

I am wondering whether what apparently just happened here is possible. I used dd to erase the MBR of a microSD Card in my built-in Card Reader, which only accepts ...
0
votes
0answers
5 views

Why do microSD cards have less than advertised space? [migrated]

I bought a new 32GB microSD card. Windows says the free space is 29.3GB in Properties for the drive. Why? I expected 1024x1024x1024x32 = 34,359,738,368 bytes. I can accept 0.5GB for the file system, ...
1
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0answers
41 views

Two-wire communication (I2C) between Arduino Micros [migrated]

I am attempting to communicate data via I2C between two Arduino Micros, but can't seem to get the "slave" device to detect a Wire.onRecieve() event. Per the specification on this site [http://www....
0
votes
1answer
71 views

What is wear leveling in SD cards? How I can check my sd card has wear leveling or not? [closed]

I searched on internet. Still I'm not clear about wear leveling can somebody explain this concept?
1
vote
4answers
195 views

A Guaranteed Way to Corrupt SD Card

I am working on an embedded Linux project that it is important to be sure that the file system won't be destroyed when some unexpected thing occurs (e.g., power failure during a write operation on SD ...
1
vote
0answers
50 views

STM32F401 SDIO with DMA

Please need help in: Do somebody have a a working code that writes to sd card via sdio using FatFs and DMA?( data logger) In a poling mode (without DMA) I am writing to .bin file and getting error ...
0
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2answers
102 views

How does an SD card communicate with a computer? [closed]

Could someone please give me a concise explanation to how an SD card sends and receives data from a computer. Does it do this one bit at a time? How does the computer/SD card combine these individual ...
1
vote
1answer
53 views

More energy efficient: writing in a SD card or transmitting by BLE for long period?

I need to store about 1 adc sample per second on a wireless project for about 10 hours. The problem is the energy. What is more efficient a constant transmission on BLE or writting each second on a SD ...
0
votes
2answers
78 views

SD card Sector size

I am working with SD card using AVR microcontroller. My question is, can we change the sector size of SD cards or it is fixed 512 bytes in SD card's case? What things should be considered if I want to ...
0
votes
0answers
37 views

Enabling DDR in SD/MMC causes problems? CMD 11 gives a response, but the voltage switch won't complete

I am trying to enable DDR on an SD card (specification above 2.0). The procedure in the specifications is as follows Execute CMD0 to make the card idle. Execute CMD8 to enable ask about the voltage ...
3
votes
1answer
73 views

SD card ACMD42 command

According to SD card datasheets, there is an internal pull-up resistor on the DAT3 line, and we can use this line to detect the card. Additionally, the ACMD42 command is described that it is used to ...
1
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2answers
53 views

SD Card Pin State During Hot Insertion

I'm working on a project in which I'm forced to connect an SD card to a shared SPI bus with some other peripherals. I need to make sure a hot insertion event won't corrupt any ongoing data transfer on ...
1
vote
1answer
163 views

eMMC interface : Parallel vs SDIO

I want to use an eMMC card for my application. After searching on different websites,I was not able to find any parallel interface supported eMMC chip. Is parallel interface available for eMMC chip?...
2
votes
1answer
96 views

Is it possible to read erased flash memory?

In hard disks, a "quick format" does nothing to the actual data on the disk - just clears the FAT (file allocation table), which then appears as a "blank disk" to the user. Therefore, it is fairly ...
1
vote
1answer
182 views

FatFs: Why am I not able to properly read sector 0?

Background: I am using an nRF52832 Development Kit with this microSD card in this breakout board. The card is powered at 3 V (I've tested running off the dev kit regulator and an external power supply)...
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votes
1answer
60 views

Make sd card WRITE/read only

I'm a noob trying to find a solution to make a sd card write/read only? Like creating files is possible but to delete something you have to format the whole card. You only can delete everything or ...
1
vote
0answers
75 views

Is it possible to emulate an SD as a slave?

What I want to do is put a dummy SD card (the connector going directly to the device with a cable going to a micro controller) into a device so that when the device tries to write a file the micro ...
1
vote
1answer
47 views

SD Card Reset Issue

I've got an issue where I'm playing around with the SPI commands to get SD card comms working but it seems that if I send something the card doesn't like I get in a condition where it can't reset. ...
2
votes
2answers
207 views

How can I write high-speed A/D data to an SD card?

I want to use a microcontroller and A/D converter to do some high-frequency (~100 kHz) long-term (minimum of five second buffer, looping until triggered) data logging. It looks like a good way to do ...
0
votes
1answer
69 views

SD Card Reader with LPC43xx

I am trying to implement an sd card reader on lpc43xx devices. For this I can make use of the LPCopen examples that use the ROM based drivers. However for some reason the ROM based driver example ...
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votes
1answer
497 views

STM32F7 FATFS and SD card Write problems

I have an STM32F7 discovery board and have an image in the SDRAM which I want to store on the SD card as BMP file. I am using chan's FATFS module with the sddiskio module and the BSP library from ST, ...
0
votes
2answers
177 views

Error initiating microSD card in SPI mode

I am trying to interface a 32 GB microSD card with PIC32MX795F512L using SPI communication. SPI communication is working fine as I have tested it by shorting the Data Input and Output line and ...
0
votes
1answer
146 views

Writing large volume of data to SD card

I'm planning to make a data logger project with 3-axis sensor and SD card. I would like to store 3200 samples per every second on SD card. Currently I could able to store only 630 samples per second. ...
1
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1answer
115 views

SD Card Trace Inductance and Capacitance

Most (if not all) SD card datasheets contain the following requirements, which I gather are copied from the standard: 16nH max trace inductance for f < 20 MHz 40pF max line capacitance Two ...
2
votes
2answers
76 views

Will cutting only the Power Lines damage the Data Lines or the Device?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. Will only disconnecting the Vcc OR Ground Wires damage the Connected Device or the Data Wires? I currently have a USB ...
1
vote
1answer
238 views

What is the way to detect sd card insertion/removal?

I am interfacing 32GB Micro SD card with PIC32MX795F512L. I am following the examples provided in Lucio de Jasio book. In one of their example, they are using ...
0
votes
1answer
68 views

How to set SD card clock frequency between 100 kHz - 400 kHz

I am interfacing a 32 GB microSD card with PIC32MX795F512L. I am following the examples provided in Lucio de Jasio's book. As the author has described that to set a 250 kHz, they are ...
6
votes
1answer
561 views

What does SWITCH pin do on a microSD connector?

I'm trying to connect a microSD card connector to my project (Molex 502774) and am slightly confused by the extra pins (nails?) provided. One of them is marked DETECT NAIL and the other one is SWITCH ...
0
votes
2answers
95 views

What extra circuitry is recommended for a plain micro SD card adapter

I intend to use an SD card to record the movement (X,Y,C) of an animal for a research purpose. I am using the Texas Instruments ARM Cortex-M4 TM4C123GH6PM launchpad along with a Sparkfun Micro-SD ...
0
votes
1answer
359 views

Do SD cards operating at 1.8V save any power compared to 2.7 - 3.6V?

Excuse me if I'm repeating my previous question, but it wasn't getting any answers probably because it was too broad. So, let me narrow the question down to just UHS SD cards that can operate at 1.8V ...
3
votes
1answer
155 views

For variable voltage devices, namely SD cards, how much power do you save by using a lower voltage?

I'm designing a computer vision system and my 3 main components are microcontroller (VDD = [1.8V, 3.6V]) microSD card (4 bit mode, VDD = [2.7V, 3.6V] according to SD 2.0 standard) cheap cell phone ...
2
votes
0answers
86 views

Atmel ARM Boot from MicroSD card

I studying the Atmel's ATSAME70Q19 Datasheet and i'm a little confused about boot operation mode from HSMCI. In Page 892, "38.11 HSMCI Boot Operation Mode" there's a reference which says: In ...
0
votes
2answers
144 views

Noisy Logic Level Converter for SD Card

I have designed a Arduino shield that is designed to be placed in the field and log data from a sensor which it then saves to an SD card. In order to log this data, I must convert 5v SPI to 3v3 of ...
1
vote
1answer
99 views

High Speed Data Acquisition with SD Card Write

I am collecting data from several dozen sensors over an 8 MHz SPI bus at 400 Hz. It is critical that the sensors are sampled at this rate with no lost packets. In order to do this, I have a timer (...
2
votes
2answers
142 views

NO CD pin in SD card module by LC Studio?

I have a SD card module by LC Studio. I am interfacing it with PIC32. This module consist of 6 pins: CS MOSI MISO CLK 3v3 GND ...
1
vote
1answer
595 views

Card Detect Pin of SDHC Interface

I am working on a design with a processor which has I2C SCL line & SDHC_CD(Card Detect) pins multiplexed. I need to use I2C line. I am giving SD Card for boot code of processor. I have below ...
6
votes
10answers
3k views

How to make 1 bit permanent memory circuit?

I would like to make a simple circuit to store or save 1 bit of data. The circuit should be able to remember the state of an LED ( on or off ) even if the supply is disconnected from the circuit. I ...
0
votes
2answers
324 views

Use SDIO pheripheral for quad SPI flash memory

I am currently doing a project using the STM32F103 micro-controller. The project requires external flash memory to store images and data for later showing on LCD. The problem I have is that I want ...
3
votes
4answers
495 views

Operating an SD card module with only two pins

My standard SD card module uses four pins: SDCS, MOSI, SCK, and MISO. However, I can only dedicate two pins of my ATtiny85 to operate it. Is there a way I can do this without using more ICs, such as ...
0
votes
0answers
128 views

Command Response SD Card Timing in SD Mode

I'm making a SD card stack and I'm currently starting to implement the SD mode. In SPI mode a card is able to receive the command, put the DO/MISO line in '1' while is taking care of the response and ...
0
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2answers
125 views

Printing SD Card File contents on LCD

This is a part of my program which reads data from SD card File and Display that on LCD screen. ...
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votes
1answer
255 views

Replacing SD card reader on a Raspberry Pi B+

I recently purchased a Raspberry Pi B+. However, the micro SD Card reader had a defective spring loading mechanism, so the card would not lock in place (a new Pi is now on the way!) However, I would ...
1
vote
2answers
144 views

How to correctly connect a MicroSD card to an FPGA device

I want to ask how to correctly connect a MicroSD card to an FPGA device(not spi version), consider all FPGA pins will be floating for an amount of time before FPGA is configured. I've found a lot of ...