Questions tagged [sd]

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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Arducam cheap microSD adapter suggestion [closed]

I am pretty sure that the micro SDadapters sold on Amazon are not SPI compatible, also referring to Eli's guide. I tested them myself with Nano + OV2640 with Arduino. The adapter and camera work ...
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Schematic to work with an SD card

The application note AN10911 from NXP contains several schematics for working with SD cards, for example the schematic shown below. However, it also states: This schematic does not include details ...
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How long can a micro SD card hold data without being powered? [closed]

I lost a micro SD card few years ego, and I'm worried that someone may find it and misuse the data stored in it. How long can a micro SD card keeps the data without being powered, ignoring other ...
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Does an amplifier consume any power when nothing is connected? (GPD2846A built-in 2W amplifier) [closed]

The GPD2846A module has a built-in amplifier into it. However, I want to use it with my headphones which don't require 1-2W (they are definitely going to distort sound and possibly be damaged). So I ...
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SD Card Not Responding To Command 0 In SPI Mode

I am attempting to communicate with an SD card in SPI mode. I am running at 133kHz. I first send a hundred or so clock pulses over the course of a millisecond with the chip select signal high. I then ...
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Capturing High Speed I2S To SD Card

I've been working on a project that involves receiving two high speed I2S lines and writing the data off of them to an SD card. The interface has the word select and bit clock I2S lines shared between ...
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How does MMC compare to SD in terms of life expectancy?

There is supposedly new surface mount SD card ICs on the market (see https://hackaday.com/2020/12/29/new-part-day-sd-nand-are-surface-mount-chips-that-work-like-an-sd-card/) which I thought was ...
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What is the smallest capacity microSD ever produced?

With the microSD (a.k.a TransFlash) physical dimensions being fixed, flash memory manufacturers compete to fit as much capacity to this as possible, so there are a lot of articles documenting breaking ...
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What do OD and PP stand for in SD card frequency fOD and fPP?

It seems all SD card specifications mentioned two frequencies (fOD and fPP) as used in identification and data transfer mode respectively. What do the subscripts (OD and PP) mean?
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Problem interfacing SD card module + CAN Bus MCP2515 module simultaneously on arduino UNO

I am trying to log data received on CAN bus to SD card using arduino UNO. each module works perfectly on its on, but when joining both modules together the CAN bus receives data normally but the SD ...
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SD card module with ESP32

I'm using an SD card module with ESP32. My plan is to store configurations such as SSID and passwords. I tried the function with a text file which contains the text "Hello" and for ...
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Hotplugging issue in MicroSD Connector

I am facing a hotplugging issue in my SD Connector setup. When I plug and check, it reads, however, not when I remove and insert. What might be the reason behind this? Attached are the schematics for ...
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Data Logging Medium: SD Card or USB

I am on a project that requires data logging and I am using an STM32F1 MCU. The amount of data is around 400 bytes per log entry. One of the environmental conditions of the deployment is vibration. It ...
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Read MicroSD card with USB reader while it is connected to (powered-off) microcontroller

I have created a small breakout board, where a microSD card is inserted and I can access its signals. Now, when the necessary SD signals are connected to an AVR microcontroller via SPI, they ...
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Problem with SD card initialization with PIC18F452 using mikroC

I'm trying to write a text file to an SD card with a PIC18F452 using mikroC. I'm using a mikroC library named Mmc_FAT16 and I formatted the SD card to FAT, but I can't initialize the SD card. I tried ...
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Raspberry Pi CM4 SD card breakout

I am designing a carrier board for the RPi CM4 Lite (no eMMC) and having trouble understanding the documentation. The CM4 proved a SD_PWR_ON and ...
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How can I initialize/use SD cards with SPI?

I've seen various blog and forum posts, tutorials and application notes about accessing SD cards with microcontrollers using SPI, but I struggled a lot at different points when following them. In my ...
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ESP32-s2 Wroom. Are the SDMMC pins same as in ESP32 (not S2)

The documentation is not very clear. https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/sdmmc_host.html Are pins the same in the S2 variant?
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SD card socket just need to wire with pull-up resistors?

I have a question about Micro SD card and STM32F446RE wiring issues. I saw this schematic from ST forum. I would like to ask, when I wiring STM32F446RE with SD card socket (I mean connection part), ...
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Mass storage for timing critical applications

I am working on a data logger that requires measurements to be taken during narrow time windows. I have been storing the measurement data on SD cards, however, the write times are very inconsistent, ...
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Is clock presence required to extend an SD card's data retention?

The flash memory on SD cards is prone to data loss over time when unpowered. While typical specifications list "at least 10 years", in practice unrecoverable read errors are likely to occur ...
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Sequential writing from different hosts to one SD/SDIO

I was wondering if it is possible to access one SD card via two or more hosts via some sort of hub and write to it data sequentially (i.e host1 writes a bulk then hostN writes another bulk)
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Samsung 32GB Evo SDHC Not Responding Correctly to CMD55

I am using the fatfs module by elm-chan. I have a Samsung 32GB Evo SDHC and trying to initialize it according to the suggestions presented in this thread. My code is stuck at sending cmd55 without ...
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Correct Wiring for Adafruit 2.2" TFT display w/ sd card

Apologies for a potentially frowned upon question, but Adafruit's documentation for the 2.2" TFT display with sd card breakout is a little lacking. Essentially, they describe the display and sd ...
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CF Express to SD card adapter

Rather noob question here. I am wondering how large is the actual hardware for the SD native host interface. Would the hardware fit in the XQD or CF Express card form factor (in addition to the SD ...
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Electrical destruction of MicroSD

I'm trying to design a device to store my private keys. I can't code in a way to just use some flash chips, so I thought I'd use a MicroSD card for the storage as a module. I intend to create a method ...
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Detect SD card via SPI interface only?

Supposing a microSD connector on which there isn't a switch/pin to indicate that the card is inserted or not, I would like to know if it is possible to detect the presence/ausence of the card only via ...
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Is it possible to have two SPI controllers and one SPI peripheral?

I have one Raspberry Pi 3 Model A+ and one Raspberry Pi Pico. I want to allow both of these devices to write and read data from this sd card reader: https://www.adafruit.com/product/254 How should I ...
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ESD pins of CM1624

I am considering to design SD interface with a CPU. For ESD and EMI, there are some ICs that can prevent these issues with RLC filter and TVS diodes such as CM1624. What I am wondering about is that ...
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4 votes
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micro SD randomly stucked in a locked state and unable to force erase

I am using a MSP430F5438A microcontroller to read and write on a delkin 2GB micro SD card using SPI interface following the Part1_Physical_Layer_Simplified_Specification_Ver6.00. I could successfully ...
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Is a computer wired controlled sd card or USB flash drive feasible (like the Scylla cards connected with a laptop in prison break)?

Is a computer wired controlled sd card or USB flash drive feasible (like the Scylla cards connected with a laptop in prison break)? It means there is no storage on the flash drive itself. When a ...
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Killing an SD card by supplying 12 volts

I want to design a self-destruction circuit to destroy an SD card as a data protection procedure. Will supplying 12 volts to an SD card destroy it to a level that it won't be accessible again? (Can't ...
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NFC and micro memory SD card

I am not sure if this is right place for this question. NFC bandwidth can go up to 50KB per second, and there are NFC business cards that have EPROM up to 8kb. Is there possibility to put micro SD ...
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Is a NAND flash chip better for power saving purposes as a micro SD card?

I know, they are technically the same, but from what I read, NAND flash chips can be controlled better like putting it into standby and waking it up in the matter of a few nanoseconds, which could be ...
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SD card communication failure with USB2244 and TS3A27518E

friends! I'm facing a very peculiar issue on a hobby project of mine, and would appreciate any insight. The schematic for the relevant part of the project is attached at the end of this post. What I ...
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Looking for a Micro SD card that can start up in 1.8V signalling mode

With the SD 6.0 specification, SD card manufactures have the option to design cards that can autodetect and start up with 1.8V signal levels. I believe they still need to be powered from the nominal ...
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Solution to interface SD card with microcontroller using only 2 pins (I2C/SPI)

So I am trying to add an SD card to my circuit and unfortunately, all I have left are 4 GPIOs, but I was asked to try and find a solution to only use 2. So using 4 is a worst case scenario. I thought ...
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Sdcard stated bandwidth at max working hours

Sandisk and many sdcard companies state the amount of hours they can work without hitting wear issues. Usually they state this while recording Full HD video but they don't state how much mbps that is. ...
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why f_rename of fatfs is very slow?

I'am developing a datalogger with an stm32L496 + FreeRtos + FatFs. The data logger save data to a buffer and when is full, the buffer is saved in a file on an SDcard with the help of fatfs and the ...
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SD card breakout board

I'd like to read data from a SD card using a microcontroller (through SPI protocol). Looking for a slot for the SD card, I saw two different boards. https://www.adafruit.com/product/254 This one has ...
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uSD card accidentally wrong voltage

(initially using STM32H745 w/ CubeIDE) uSD card was working, but was getting some fifo underrun issues? so I started switching rising/falling edge, and flow control and stuff. Now the card doesn't ...
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Powering an ESP32-DevKit with 3 AA batteries

for my project i have to put quite some stress on my ESP32-devkit in addition to it needing to be a mobile device. I need to power the esp32, an SD-card reader, an LCD-display, two I2S-MEMS-mics and ...
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3 answers
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What replaces SD card in industrial applications

I am using a SOM (something with Zynq 7000) that boots from an SD. While SD provides a lot of storage, i can't use it in industrial applications in a long term- it is not rated for temperature range ...
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What's wrong with this SD card CMD0 logic analyzer trace?

I'm trying to talk to an SD card from an ESP8266, using one of the internal SPI drivers. No matter what I do, the card never responds to the initial CMD0 setup command. I think I'm sending the command ...
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STM8 - Micro SD Card [closed]

I have a STM8S003F3 and a Arduino Micro SD Card Module. I want to create a file inside the Micro SD card. How can I do it? Can you help me? Thank you in advance.
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Calculating SD card size from C_SIZE in CSR

I'm guessing I'm just reading something incorrectly here, but I can't make this add up. From the SD card spec, section 5.3.3 tells us how to calculate card size (C_SIZE) from the data in CSR (CMD9 ...
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MicroSD with STM32 and SPI mode - pull-ups and EMI filters

In the context of using the STM32F103C8T6 microcontroller I wonder I am thinking about the most practical and relevant method of the microsd application in the device from the point of device security....
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Do SDIO bus speeds need to match between two devices?

I have two devices that I'd like to use together, connected via their SDIO pins. The MCU can transfer data up to 200 MB/s with a 200 MHz clock speed (HS-200). The wireless module that I want to use ...
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microSD card communication problem

I am developing an embedded system and attaching a uSD-card to it in SD mode (not SPI). The requirement is such that I have to switch the uSD card connectivity between two ports so I am using 74HC4053 ...
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Flash or EEPROM

EEPROM vs SD Flash I am working on a Arduino program (a game, a slot machine) that needs to store 16 bitmaps (the slot machine symbols) that are 32 * 16 bytes each (total 8192 bytes). The bitmaps are ...
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