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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0answers
24 views

SD Card Buffer in FreeRTOS

One of my tasks in project is resposible for gathering information about values measured from sensors and write information in .txt file on SD Card. I've got question, how would be the most correct ...
1
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1answer
104 views

My For loop isn't exiting and I don't know why

I'm programming an ATMEGA328p on a breadboard and using an arduino board to do the USB to Serial conversion. Part of some code I'm writing involves a for loop that is being used to take the 8 bit ...
1
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0answers
20 views

Problems initializing SD card with MSP430

I've been working on some code to talk to an SD card with the MSP430. I can't get the card to enter into idle mode, and I'm actually pretty stumped as to why. I've looked at the microcontroller output ...
0
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2answers
39 views

SDXC Card Reader with LPC1822

in my application I have an SD Card reader using the NXP LPC1822 microcontroller. It works very good with all SD- and SDHC-Cards I've tested so far. Only thing that does not work is SDXC. I already ...
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2answers
143 views

Most carefull way to concatenate strings in C

My firmware in one cycle per 10 second is moving string to the output (csv file on SD card). The problem is that string sometimes in non-deterministic way is changing adding values that shouldn't be ...
1
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1answer
68 views

A USB SD card reader on your own PCB

I'm actively looking for a solution about this since nearly 2 months: I need to build a USB SD card reader slot for my project www.samplerbox.org. I tried various solutions: buy some cheap USB SD ...
0
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1answer
52 views

File transfer between two gsm modem

I'm wanting to build a system that will store value on a SD card to form .CSV file , that this is not a problem. There will be about 1000 value recorded daily.I'm wanting to send this values to a pc ...
5
votes
2answers
488 views

What does it mean when components in schematics do not connect?

I'm fairly new to the whole Arduino world, and I'm just really curious about this schematic that I came across... I can read the basics of a schematic, but this one has me puzzled. What are the ...
0
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1answer
44 views

Arduino to read file data from SD storage board, and PC user to update same file via usb cable as needed

I have a project where in the finished product (sketch loaded to Arduino and it's running on its own), Arduino needs to regularly read data from a text file stored on a SPI Micro SD storage board (the ...
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1answer
47 views

microSDXC Card not responding to SD Interface commands in 3.3V mode

I want to interface a 64GB microSDXC Card via 50MHz SD Bus mode (not UHS, 400kHz during initialization). My initialization sequence works fine with the regular 2 GB SD card from my phone up to ACMD41, ...
0
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1answer
60 views

STM32 and SDCard: space management

My task is to gather measurement from peripheries of STM32F4 on SDCard and I started reading about this. Could you double check if I'm correct: Single block memory on my SDCard is 512 bytes, so ...
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0answers
41 views

Audio recorder takes more time than expected

I'm building an Audio recorder with PIC32, that store the recorded audio in a SD card. I have a problem that happeans with both the compiler mikroC (using swap file) and MPLAB X IDE (using fatfs ...
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2answers
155 views

SPI Troubleshooting, Teensy, Arduino, and tri-state

I'm trying to get my SPI bus devices up and running on a custom circuit board that I've soldered together. Unfortunately, I neglected to add probe testing spots on this particular circuit board, and ...
1
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1answer
104 views

Adapt fatFS library to PIC32

I'm developing an application with PIC32MX, that record 3 WAV sounds and store theme into SD. Unfortunately the speed that I have reach is 155 kB/s and is insufficient for my application. Then I have ...
0
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2answers
76 views

SD card logic levels

I'd like to use an SD card using an SPI interface. My microcontroller uses GPIO logic levels of 2.8V. Do I need a level shifter, or can I connect the card directly? I've had a look at the Physical ...
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votes
1answer
238 views

What's the absolute cheapest way to make a 4K HDMI recorder [closed]

I'm looking to build my own 4K HDMI recorder, because the products currently on the market are just to expensive for me. As my title says, I'm trying to do that in the most low-cost way possible. ...
0
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0answers
78 views

SD card PIC interface

I wonder if anyone can answer this question. I am working on a project whereby I would like to interface an SD card using a PIC. I already have the PIC16F887. The circuit will basically connect to an ...
0
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0answers
187 views

SDHC + SPI - “illegal command” when trying to read

I was given a supposedly non-working MicroSDHC 16GB Kingston and I am trying to salvage any data from it. I am interfacing it with BusPirate in SPI mode. I can sucessfuly initialize the card, but ...
0
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1answer
116 views

Atmega328 to SD card issues [duplicate]

I am working on a board that includes an Atmega328 which needs to read data from an SD card. I am having problems. Here is a diagram: I believe the issue may stem from the voltage divider that is ...
2
votes
1answer
339 views

MicroSD card SPI with ATmega32 [closed]

I want to communicate with a microSD card with an ATmega32 using SPI. I make a simple SPI loopback, and it works fine. Now, how can I communicate with the microSD card to write and read simple bytes ...
0
votes
3answers
128 views

Level Translator for AVR and microSD

I want to connect a microSD card in my AVR ATMEGA32, through SPI, which its operate with 5V. The microSD card i think that operates with 3.3V so, it is must to connected via bidirectinal level ...
2
votes
0answers
88 views

Conformal coating and micro SD card sockets

I have a embedded computer design which uses a low profile micro sd card socket as an extra option in addition to an on board solid state disk as storage/booting mediums. In manufacture the board is ...
0
votes
2answers
63 views

A NAND flash sector suddenly goes bad. What happens to the file using that sector?

I can read a lot about how NAND flash can be checked for bad sectors, which are flagged and won't be read/written to in the future, but happens at the moment a sector goes bad? Any file that was using ...
0
votes
1answer
67 views

Retrieving data recorded by an IoT sensor

If an IoT object records data (accelerometer, gyroscope, ...) in memory, what would be the smartest way to retrieve these data after, let's say, 2-3 days? Store in JSON format on an SD Card? Store ...
1
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1answer
142 views

SD Card 4-bit Mode License

The Micro (STM23F4xx) I'm using happens to include a SDIO peripheral that is supposed to support the 4-bit parallel bus SD Card protocol. I'm aware that the SD Association holds patents on the ...
0
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1answer
142 views

SD Card Access Library

I am accessing my SD card using SPI. But I've found this to be slow and I am also sad that when there is a faster protocol already supported by my SD card I am using a slower version. Is there a C ...
1
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1answer
549 views

How to write on SD card smaller than sector size (512 bytes)

I am writing a library for FAT file system management on STM32 for learning purpose. I want to use a SD/MMC card connected through SPI bus. I do some tests with a disk image on PC (I emulate ...
0
votes
2answers
580 views

Interfacing FPGA and a storage device

I'm doing this project called "High data rate logger". The requirements for this project is to sample the 2 analog signals simultaneously. 2x channel 14-bit ADC Store 60 MSps (mega samples per ...
2
votes
2answers
341 views

Writing to SD Card cheaply

So, here's the scenario: I have an Arduino and an SD card. Unfortunately, I don't have one of the fancy shields, and I don't have the time to order one. As we know, Arduinos run on 5V, and SD cards ...
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1answer
241 views

How to add a password to an SD card?

I want to build an embedded system that reads external data and logs it to a file saved in an SD card. However this system is accessed through a password and I want either the SD card or the file in ...
1
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2answers
778 views

How about soldering microSD card directly to PCB?

I know that microSD cards are typically not designed for this type of use, but has anyone tried this? Would it be possible in production ( >1000 units), that is, would any PCBA service be able to do ...
0
votes
2answers
147 views

Buffer management for SD card in SPI mode

I'm looking into implementing storage of large audio files onto an SD card. I'll be using SPI to access the card to avoid any patents by the SD card mafia. I'll be generating a lot of data, about ...
0
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0answers
105 views

Is a file system something that is implemented in hardware or software?

The context of this question is that I would like to be able to take an SPI flash IC and store audio files on it. The reason I need a file system, specifically FAT, is because I'm using an OGG Decoder ...
0
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0answers
78 views

Cost effective high quality audio recording & playback design

For a few days now, I'm looking for a cost effective way for recording a few minutes of audio in high quality 44.1KHz @ 24bit and be able to save a bunch of these "tracks". I thought to use SRAM + ...
0
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1answer
262 views

Designing Flash Memory to USB Mass Storage bridge

I've been scratching my head at this for a while now. I'm trying to build a device that records audio using a VS1053 encoder IC to some sort of SPI flash memory. I want to be able to download the ...
2
votes
2answers
2k views

Difference between 1-bit, 4-bit and 8-bit SDIO

Please help me understand the significance of 8-bit SDIO over 1-bit and 4-bit SDIO. Let me know the pros and cons of each type. Wiki or SDIO specification document does not discuss this.
2
votes
3answers
139 views

Is the slide-lock on an SD card optional?

When enabling the write lock on the side of an SD card, is the write protection a physical limit on the SD card, or a flag sent to the reader or OS telling it to please not write?
5
votes
3answers
3k views

Is it possible to use an SD card without a file system?

I'm doing a project on PIC, which needs a large amount of memory to store data. I want to use an SD card as the memory storage element. I don't want any type of file system. I googled the interfacing ...
2
votes
2answers
435 views

Interfacing 3.3V SD card MISO output to ATmega328P

I am attempting to write data to a SD card from a ATmega328P micro controller with no luck. I've narrowed down the source of the problem to the MISO output of my SD card breakout board, which doesn't ...
2
votes
0answers
356 views

SPI SDHC Initialization Timing Problems

I Have a 16GB Wi-Fi SD HC Card from Transcend. I try to initialize the card via SPI using an Arduino Uno, sending CMD0, arg: 0 , CRC: 0x95 response:0xFF but the expected response ...
2
votes
1answer
448 views

Low power temperature logging to an SD card

I want a make a low-power data logger, for now just to read a digital temperature sensor (DS18B20) and write the data to an SD card. The device will be asleep most of the time and just wake up from ...
0
votes
1answer
408 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
477 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 ...
7
votes
5answers
1k 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 ...
0
votes
0answers
108 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
143 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
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1answer
297 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 ...
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0answers
520 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
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2answers
2k 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
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2answers
125 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 ...