Secure Digital, a memory card standard.
3
votes
1answer
37 views
SD Comms Resetting Processor
I have implemented an SD/FAT combination on a Renesas RL78/G13 processor. The SD card is being driven using SPI.
The code has been proven to work on two custom target boards using a 2GB card - the SD ...
6
votes
1answer
101 views
Does an SD card in SPI mode respect chip select/slave select? Seems to be resetting in my application
I have an application where I have a microcontroller (NXP LPC1343) which is connected to an FPGA via 16-bit SPI. There is also an SD card using the same SPI port (MISO/MOSI) but with a different CS/SS ...
1
vote
1answer
30 views
Renesas RL78 SPI Baudrate Change
I am using an Renesas RL78 and SPI to communicated with an SD card. I have the driver working using the single command Baudrate of 400kBaud when sending both commands and data.
Of course, this is ...
1
vote
0answers
59 views
Has anyone seen power cycle corruption in industrial SD cards?
I am using a micro SD card in a new embedded Linux system (choice of SD was not mine, was made by the hardware guys). I have seen a problem before where power cycling of a system without doing a ...
0
votes
2answers
109 views
What Happens when Read or Write Failures Occur on SD Card?
I have been happily backing up and copying SD (including microSD and SDHC) cards from a Linux PC using the following commands:
...
1
vote
1answer
97 views
SD card socket with MMC and Atmel
I'm trying to include an SD card slot in one of my designs. The whole SD format seems confused at best, and I can't seem to find a definitive answer to what I need to wire up.
Apparently the easiest ...
1
vote
1answer
103 views
Arduino - Log Data to SD Card with Computer
I have an Arduino R3 Uno and I was wondering if I can log data to it using a computer's SD card slot, since I don't have an SD card shield. Any suggestions? Thanks!!!
3
votes
1answer
98 views
Problem stacking accelerometer and SD card shields on Arduino UNO
I have an ADXL345 accelerometer on a Makershield stacked on top of a Seeed SD card shield. Both of those are stacked on an Arduino UNO R2.
I've got each working individually, but when stacked they ...
4
votes
1answer
181 views
How to properly open and close files “inside” a member function? [closed]
I am using Arduino Uno and the Ethernet Shield with a 2GB SD Card. I have the following working code intended to be used to write data on the SD Card (note: the SD Library is properly initialized and ...
2
votes
0answers
256 views
Corrupted files generated by Arduino with SD library. How to avoid that?
I have a sketch that runs on an Arduino Ethernet (that comes with an SD card reader and, of course, an Ethernet interface).
There is a unique place in this sketch where I write to a file on the SD ...
5
votes
1answer
176 views
Occasionally the first byte of data from an SD card SPI read is bad
The device I am developing is an SD card storage add-on to a retro computer, SanDisk Ultra II 1.0 GB SD card in an SD card socket (I have no idea if the brand is significant, it just happens to ...
3
votes
0answers
99 views
Diagnosing SD card failures
I have an embedded device using an SD card. Occasionally I see SD cards fail, and I need to understand the failure mode.
Are there tools, perhaps for specific manufacturers, that help me understand ...
1
vote
0answers
60 views
MicroSDHC WP_VIOLATION stuck on
I have a few 8 gigabyte MicroSDHC cards that are being used as the nonvolatile storage in a data logging hardware application. The data being stored is going to be in a raw format, rather than in a ...
3
votes
5answers
181 views
Text editing memory management
I'm building a PIC-based text editing 'laptop'. I have an SD card connected to the PIC and am using a keyboard and an LCD screen.
My problem is that I want to edit real big files like for example ...
2
votes
1answer
220 views
EEPROM or SD card storage for a general logger application?
If you need to store data, let's say numbers (one byte each), and you need a capacity for at least 100,000 readings in a low power sensor (3.3 V and less than 20 mA in stand-by operation), ...
4
votes
2answers
258 views
SD card as ROM memory in a microcontroller
Can I use an SD card as ROM for my microcontroller? What other options are there if I want a large amount of ROM memory (cheap)?
0
votes
1answer
285 views
PIC, SPI problem with SD card and other devices
I'm using a PIC24H as a master connected with a microSD card, ENC28J60 and a MCP28S08 port expander. I'm using the FatFs library for a microSD card and the Microchip TCP/IP stack for ENC28J60.
All ...
2
votes
1answer
71 views
Buffering Micro-SD data for power saving useful?
I have a datalogger which has only 4KB of SRAM, and because of that it needs to flush its buffer to MicroSD every second. Would adding external SRAM to create a larger buffer safe any significant ...
3
votes
1answer
101 views
Advantage of SanDisk iNAND?
I'm looking for a low-power microSD card for a datalogger, when I came across SanDisk's iNAND technology. What are some real-world advantages of those vs. microSD cards, except for their smaller ...
-1
votes
2answers
166 views
Connecting an USB disk to a LilyPad Arduino [closed]
I'm trying to connect a small USB disk or a microSD card to a LilyPad Arduino project, but I cannot find the shields to do that. Do they exist and if so, would be possible to be done?
I have found ...
8
votes
0answers
385 views
How can V-USB screw up the built-in SPI of an ATmega328p?
I'm working on a V-USB project that shows up as a Keyboard using an ATmega328p. The USB part is working great (it's not my first V-USB project), but after I start the V-USB stack with ...
2
votes
1answer
227 views
SD card sector address vs. physical location
I'm curious as to how SD cards map the supplied sectors for read/write to physical locations in the flash memory. Is this the real physical address, or is it just a virtual address that the SD ...
1
vote
1answer
412 views
SD Card initialize problem
I use a SainSmart UNO with LCD4884 and HC-SR04 Distance sensor and an Arduino Shield Plus SD (SD-card module with RTC-DS1307) to measure the water level of a well. The calculation and LCD4884 display ...
8
votes
5answers
1k views
Does magnetism affect SD cards?
Would a strong magnet have any effect whatsoever on a thumb drive (I'm assuming not) or on an SD card? It seems unlikely, but I'm hoping someone can give me a definitive answer, since I'd rather not ...
4
votes
1answer
358 views
MicroSD flash block size
I'm working on a low-power application with data storage on a microSD card. In the interest of minimizing power consumption, I'm planning to buffer data to RAM before writing, and I suspect that the ...
3
votes
2answers
113 views
What gives some flash memory a higher speed rating than other flash memory?
What gives some SD/MMC cards a much higher speed class rating than other SD/MMC cards?
Why are some solid-state "disks" (SSDs) much faster than other SSDs?
I'm hoping that I can take at least some ...
1
vote
0answers
113 views
DVSDK OMAPL138 Software Developer
I want to develop and run a program on the development kit
"Zoom™ OMAP-L138 EVM"
with the DVSDK, but I can not boot the Linux image from the SD Card.
I followed the guide "OMAPL138 Software ...
-5
votes
2answers
661 views
msp430 - adc data to sd card
my question is to establish a connection between sensors and MSP430 with the ADC pins. Then taking those data to store it in SD card. SD card is in SPI mode. I want to graph these data on Excel or ...
6
votes
1answer
437 views
Are there problems accessing a microSD card via SPI when there are other slave SPI devices?
I'm working on a design that has a CPU with only one SPI port. I have multiple (3) slaves connected to this port, one of which is a microSD card.
Here is a report from an engineer who says that SD ...
8
votes
2answers
1k views
Why is SPI Flash memory so limited in max size, and cost way more (per MB) than SD flash memory?
For example:
SPI Flash largest size is 512MB at $9/ea: SPI Flash prices
vs
2GB of microSD $3/ea (some with $1 shipping): microSD prices
3
votes
5answers
1k views
SD card emulation
Problem description:
I've built a MSP430F2370 based 15693 RFID tag reader/writer .
The main board has a daughter board, shaped as a SD card,
which connects to a SD card holder/reader.
We were ...
3
votes
2answers
389 views
Extracting images from a camera in real-time
Me and a group of students are building a UAV and we want to put a high quality camera in it (i.e. a decent ~100mm zoom lens) and interface the imagery with on board processing. I have looked around ...
3
votes
2answers
139 views
Is it normal for a micro SD card to have higher write speed for the first blocks?
I'm using a micro SD card of 4Gb from Kingston in an embedded project and I'm accessing it with a low level SPI driver.
Everything is running just fine, except for a weird behavior: after a given ...
13
votes
5answers
4k views
Is it true that a SD/MMC Card does wear levelling with its own controller?
I can't find any reliable information about this. I don't have the full specification of the SD/MMC Card hardware.
Is it true? My high-level application doesn't need to be concerned with wear ...
2
votes
0answers
244 views
IC for recording video (from an image sensor) to a memory card [closed]
I am building a device that is recording a video feed to a memory card (SD).
I have been working with the DaVinci chip from TI but the footprint and the overall system (RAM, etc.) is still too big ...
4
votes
1answer
692 views
MMC/SD card interface - any access to wear levelling info? (counters, etc)
I don't suppose there's something in the MMC/SD card specification for retrieving any information on erase counts on an MMC/SD card, is there?
My goal is to get my embedded system to avoid writing to ...
4
votes
1answer
834 views
Problems reading data from a microSD card
I am trying to read a block of data from a standard capacity micro SD card, but the received data does not make any sense. Here is what I'm doing:
Initializing the card
Reading data
Setting CS low
...
7
votes
1answer
458 views
Are there any SD cards optimized for single block read/writes?
I have used SD cards for several embedded applications over the years. However, as cards have gotten larger, the single block read and write speeds have dropped. I suspect this is largely because ...
3
votes
2answers
1k views
Which Library for MicroSD cards with Arduino
I'm trying to use a MicroSD card with an Arduino (AtMega 328). I'm using the SPI interface.
I've tried using the Arduino SD wrapper, but whenever I #include the ...
2
votes
1answer
602 views
What type of camera is compatible with the Arduino Uno in which its pictures can be saved onto the SD card?
Researching interfacing a camera to the arduino, there is not a good amount of data out there. Do any of you know the ways to do this and successfully be able to save the picture to the SD card for ...
2
votes
1answer
1k views
Memory Card to USB IC?
Today I purchased a USB memory card reader. I cracked it open and saw that it basically only has an AU6477CL IC, which is based on the AU6370, which is a chip which takes SD/MMC/etc pins as input and ...
3
votes
5answers
939 views
Interface high quality camera to computer in real time?
I have a project that requires high quality video and stills to be acquired (almost) live with computer controls. By "almost" live, I mean that a 5 second delay is acceptable, but 5 minutes isn't. ...
8
votes
2answers
1k views
Do all microSD cards support SPI mode?
Have you ever encountered an SD card which does not support the SPI mode?
I know microSD are not required to but I believe all do support SPI.
EDIT: The information about optionality of SPI seems to ...
4
votes
2answers
2k views
Is it possible to use 4-pin mode for an SD card with a microcontroller instead of SPI mode?
Is it possible to use the 4-pin mode of an SD card when designing an interface with a microcontroller, or must you always use SPI mode? I am particularly thinking of a microcontroller such as a PIC24. ...
3
votes
1answer
2k views
SD card read/write problems in SPI mode
I am working on an NEC v850ES/JH3 controller for testing SD card driver in SPI mode.
We interfaced SD card slot directly to v850ES/JH3 controller without any pullup resistors.
Is it gives any negative ...
2
votes
1answer
238 views
Leakage current for an SD card host
I'm using a PIC24F to interface with an SD card in SPI mode. When the card is idle, the device still draws ~200 uA of current which is unacceptable for this device's purpose. To correct this, I am ...
7
votes
5answers
1k views
How do I protect SD card against unexpected power failures?
I am working on a device that uses the Microchip MDDFS library to store data to an SD card. The logger will log data at a maximum rate of 1 entry (56bytes) every minute. The problem is the device may ...
3
votes
2answers
2k views
GPS Data logger using MSP430
I'd like to make a GPS logger. I've got a GPS from Microsoft Streets and Trips. I read that it communicates at 4800 baud over RS232 at 3.3 or 5v. I've got an MSP430G2231 from the launchpad kit and I'm ...
2
votes
1answer
151 views
Micro SD cards & T-flash?
Something interesting I've noticed with cheap devices from China (such as iPhone clones and digital cameras and the like) is that the manuals always specify they are "T-flash" (TransFlash) compatible, ...
17
votes
5answers
2k views
Do I need to pay royalties to the SD card people if my device “just happens” to be compatible with SD cards? [closed]
I'm designing something which will use an SD card. The device will be able to read and write the cards, using publicly available specifications. Do I need to pay the SD card people?
