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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27 views

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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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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30 views

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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55 views

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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46 views

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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45 views

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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42 views

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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58 views

What will happen if two SD card readers are connected to the same SD card?

The title is somewhat misleading. Specifically, what I'm trying to do is to connect the SD card inside of my Nintendo 3DS to a USB C port which can be used for charging (so I don't need to keep ...
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MicroSD card performance deteriorates after long-term read-only usage

I'm using a STM32L432 microcontroller to read data from a microSD card via SPI. In my application, I'm playing a sound file with a length of 10 s in loop. I found out that after the application ran ...
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How different are the eMMC and SD Card protocols?

The eMMC protocol is freely available on the JEDEC website. The SD Card (4-bit) protocol is not publicly available. Many sources imply compatibility between SD Cards and eMMC, apart from differing bus ...
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Role of resistors in SCLK-CS-DI-DOUT lines in SD card circuit

hope everyone is safe and well. I want to design a microSD card circuit. I searched for a reference design I noticed that they add a resistors in series in SCLK-CS-DI-DOUT lines.Catalex-Micro-SD-Card-...
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64 views

Which pull-up resistors to connect when microSD is interfaced in 1-bit data bus width mode (SDMMC, STM32)?

I am going to interface a microSD with STM32H7 (via the SDMMC interface). The SDMMC supports either 1-bit or 4-bit data bus width. If I use the 1-bit mode, do I still need the pull-ups on D[3:1] ...
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mcp3008 and sd card module error

I am making a datalogger arduino based, it reads from the adc mcp3008 and save on the sd card ADC and SD Module uses SPI . when the adc is used alone it works fine . but when adding the sd module to ...
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Samd51 fatfs driver with sd card backend stuck in an infinite loop

I am trying to use the FatFs module in the Atmel start for my project with the samd51j19a chip. The clock is @ 120mhz and the sd card is wired according to the diagram on the PINMUX. The program ...
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102 views

Interfacing SD card (SDSC) with Arduino Mega 2560 without SD module

I have just got into the idea of storing multiple scripts in an SD card, and using a custom driver written to the board to execute those scripts on demand. I have a 2GB SD card, and an Arduino Mega ...
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1answer
42 views

Interfacing 3-5V power source with 3.3V SD-card

I'm trying to find a reliable way to connect my nRF52840 BLE-module to a 3.3V SD-card. The application is going to run on a lithium-ion battery and power is extremely budgeted. The nRF52840 module can ...
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1answer
181 views

Read and Write file from SD Card with fpga

I'm working on a simple project with Quartus in which I've tried to implementent a NIOS II processor for read from and write to a SD Card. Here it is the schematic The C code is ...
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73 views

Talking to SD card *adapter* from FPGA

I have an FPGA (Lattice ICE40UP5K) at hand and need to do some SD card I/O with it. There are tutorials about interfacing with an SD card with an FPGA, but they typically concern with the case where ...
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85 views

Schematic check

I made my first schematic for an electronics project. Since this is the first time there'll probably be a lot of beginner mistakes and it would be really helpful if someone could check it for wiring ...
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101 views

STM32 SD SPI FR_DISK_ERR

Hi I am working on STM32F103c8t6 MCU.I am trying to run sd card with spi wiht this library https://github.com/eziya/STM32_SPI_SDCARD do every thing like youtube video and my connection is like video ...
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1answer
106 views

MicroSD to USB adapter

My goal is to make a MicroSD to USB adapter myself. With this question, I saw that I can use a USB2240 controller chip to connect my µSD card to my computer. In ...
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microSD card voltage level- reverse engineering design

Goal: Adding (back) a microSD socket to a camera that does not have one. The microSD pads are laid out and appear to be fully connected. Ground is to the ground plane, the data lines are with ...
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112 views

flash SPI memory vs USB SD card

i need to be able to update this memory storage device 1000 times per second via MCU in small 8 byte of data chunks trasnfers, and then read back the data into the PC. Should I go for the USB SD card ...
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107 views

Use MicroSD to SD adapter for read Memory Stick Micro M2

While searching in my personal affairs I found a Memory Stick Micro M2 (Sony) which I believe I was using in a phone. Unfortunately I no longer have the adapter ...
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63 views

STM32WB - sensor data sent via BLE and saved on SD card (SPI)

I have an STM32WB and I am trying to get the data from some pressure, temperature and humidity sensors through DMA and send them to my Android via BT, while at the same time saving it as well on a SD ...
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142 views

Open multiple files on SD Card using FatFs

The code is to log data in multiple files on SD card. The problem is that the SD card only opens and saves 1 file. When the if condition occurs in the 2nd time, the old file is deleted and the SD card ...
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79 views

Switch power on/off when SD card is inserted/removed in slot

I have ESP32 and I'm using it to read/write data from an SD card that is directly connected over SPI. This works fine. Now I want to switch on the ESP32 automatically by switching on the 3.3v power ...
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Part number / manufacturer of microSD connector of Raspberry PI zero

Do somebody know what is the part number / manufacturer of microSD card of Raspberry PI zero? I would like to include it on my Digikey cart if possible. Schematics does not show the part number... ...
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162 views

USB2244 enumeration failure

I have a PCB with a USB2244 USB to SDIO bridge IC connected to a Raspberry Pi Compute Module 3+. I (think I) designed based on the schematic circuit for the USB224x evaluation kit EVB-USB2240-IND. ...
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192 views

STM32WB55 connection to SD card with SPI FR_NOT_READY

I am very new at this and I don't understand a lot, so please be patient. I have an STM32WB55 to which I need to connect an SD module to store data from some sensors in SPI mode. I basically followed ...
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38 views

STM32 Nucleo board, SD card displaying symbols instead of numbers

Devices: STM32F4 The SD is working and the data is saving on the SD, but the problem is that the integers are displayed as symbols in this SD. So I think that the problem is that the function I used ...
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75 views

SD Card detect switch circuit diagram

I need to work on a design for an SD card connector. I'm having some trouble understanding the 'SD card detect' Switch and 'Write Protect' switch operation. Unfortunately, I don't have a physical ...
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550 views

SD card via SPI: pull-up resistors or dedicated IC?

It's common to find SD card connected to MCU via pull-up resistors, like in the schematics above: Recently I have read that newer SD card to achieve high write/read speeds needs to have sharps edges ...
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Boost converter for powering SD card

I want to use a switching boost converter that has 3.3V output in order to power an SD card. Also, the input voltage is a CR2477 battery, with voltage ranging from 2 to 3 volts. I have seen that an SD ...
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37 views

Do “standing”/90° MicroSD card slots exist?

For a rather cramped design, I need a way to hold a MicroSD card in a "standing"/"upright" position (90° to the PCB, rather than "flat"/"parallel" like most sockets). The card will be plugged and ...
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SD card SPI initialization Check Pattern Fail

I'm trying to interface a Swissbit 512MB (S-450u Series) SD card (datasheet here) with an ARM microcontroller through the card's SPI interface. The datasheet for this card says it's fully compliant ...
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SD card reader, had to add 1k resistor to make it work, why?

I was having a problem making my sd card reader work with Arduino Mega, I tried a lot of things to no avail until I read somewhere that I should try putting a 10k or 1k resistor in series with the ...
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66 views

Where is load-leveling data stored on a MicroSD card?

Reading this question on load-leveling of writes on a MicroSD card, Is it true that a SD/MMC Card does wear levelling with its own controller?, it prompted me to wonder where on the MicroSD card is ...
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132 views

Can I use the 1.8 inch TFT LCD SD slot for other purposes other than displaying images on the display?

Can I use the 1.8 inch TFT LCD SD slot for other purposes other than displaying images on the display? For example, storing text files on that SD card (that's on the display's SD slot)? Can I use that ...
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45 views

Can unwritten (but presumably otherwise usable/functional) blocks on an SD ever fail to be readable?

Does an SD come from "the factory" with all of its ECC (or spare area) set correctly? Sometimes when I blindly dd (copy) an entire SD card (that is only partially ...
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77 views

Errors in SPI communication with SD card due to heat

Given is a PCB with a STM32L432KCU6 and a microSD card connected to it via SPI at 40 MHz in SPI Mode 0. The communication is protected by CRC which is calculated by the microSD card on the fly. When ...
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1answer
57 views

Wear leveling and supply of voltage

Does anyone know if a NAND flash device (e.g. microSD) has to be continuously supplied with energy for its wear leveling algorithms work as designed? Or, if it doesn't matter if the device is (safely) ...
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56 views

SD card sharing between atmega2560 and sim800

I am designing a data logging system that uploads its data via 2G, and downloads new firmware from a server to the SD card, which the mcu boots from. So far, I have achieved Over The air update by ...
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1answer
677 views

Write endurance: Is there a difference between eMMC and Micro SD Card?

I have seen several forum posts (link 1, link 2) debating whether eMMC offers an endurance advantage over SD cards for embedded applications. My understanding was that the write endurance problem is ...
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37 views

Monitoring SD/TF Card status while interfacing with separate host

I'm working on project that requires taking several terabytes worth of RAW photos on DSLR controlled by a microcontroller. Initially the plan was to use a small Linux SBC running some kind of control ...
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1answer
140 views

PCB sound memory for toys [closed]

I want to build a toy. The initial build will be a prototype but if the idea 'sells,' I want to build en-masse. For the prototype, as I do not have (beyond what I learnt at Uni) industry experience, ...
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83 views

How to modify an SD card so it will be read only?

I checked SD card pins and their descriptions and saw that there is a "data input" and a "data out". If I covered, removed the data in pin, would it block all the writing requests to the card?
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119 views

Sandisk micro sd card not detected. How to diagnose the problem without knowledge about the sd card protocol? [closed]

Seems to be a common problem with Sandisk micro sd cards. Just a little before or after the warrenty period, the micro sd card suddently stop to be recognized. I mean phones and external card reader ...

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