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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18 views

UHS-I SD cards - to switch the supply or not?

I am currently in the process of bringing up a board with i.MX RT1060 and an SD card slot. IO voltage switching is working as intended, but we are not able to go above roughly 70 MHz. I am confused ...
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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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sd controller behaving unexpectedly

I'm trying to get a data logger working, using the micro SD card socket on my Altera FPGA board. I'm using an sd controller provided for an MIT course (sd_controller.v), but I can't get the writing to ...
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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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155 views

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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33 views

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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59 views

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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118 views

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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41 views

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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84 views

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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SD Card detect, help

I have a SD card socket in a server that i can't get to work right (it wa damaged when i got it). As far as i read i need to connect CD (Card Detect) to GND if the card is inserted so i did and it ...
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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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143 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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33 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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87 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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27 views

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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170 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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94 views

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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59 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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131 views

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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88 views

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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120 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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66 views

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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205 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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48 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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266 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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92 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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91 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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172 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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137 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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146 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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184 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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82 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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225 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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97 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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228 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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290 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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48 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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100 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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