Questions tagged [eeprom]

Acronym: Electrically Erasable, Programmable Read-Only Memory. Sometimes used with Flash parts that are similar to old EEPROM parts.

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134 views

Secure storage of Data in external EEPROM

I am working in designing of a prepaid energy meter. One of the most things I should store are (private key, credit and cumulative energy). The private key is stored only once. The credit and ...
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2answers
787 views

Single I2C EEPROM 24C02 uses all eight addresses by itself

I was scanning for a used address by I2C EEPROM (24C02). Contrary to my expectations, it returned all eight possible addresses (0x50-0x57) instead of the hardwired one. I thought the problem was in a ...
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1answer
63 views

EEPROM Interface confusion with Address?

So im researching how to interface with a EEPROM Chip via I2C with an AVR (Still learning a lot of the interfacing). Anyways, the AT24C16 for instance (or that family of EEPROM) seem pretty popular. ...
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47 views

Programmatically verifying EEPROM pins connected

I can't find really much about it online, but am curious if there is any bit-fiddling like tricks to verify all pins on a EEPROM are properly soldered/connected (particularly address pins on a ...
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2answers
758 views

Reading image, sound, binary file from nonvolatile memory for FPGA

For applications that require design on FPGA which shall make use of several image files, sound files or other forms of files, can they be simply included in the FPGA design configuration file? In any ...
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1answer
2k views

Pointer Size using eeprom.h with ATmega328p in AVR-GCC

I am working on a project that randomly reads and writes large blocks of data from EEPROM, based on user input. I have used the EEPROM before, but I never really thought about this. In the operations ...
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3answers
532 views

Storing An Led's Previous state when power is removed with eeprom now

A while ago I asked a question about having 2 push buttons, and an LED and you set the led to an on or off state with the two buttons, and then remove the power, and when turned back on, the led ...
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2answers
352 views

Changing the standard “message” on PIC24F shown on Android

I am working on an android accessory development. Currently whenever I plugin my Android device to the PIC24F (which I had programmed in the PIC24F) but I haven't installed in the Android phone It ...
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1answer
207 views

EEPROM Read Operation Always Returns 0xFF

I'm working with a AT24C04 EEPROM which communicates with a LPC1768 MCU on a I2C bus. I try to write a 8 bit data (0xF0) on the 0x00 Address of the memory but when I want to read the content of this ...
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1answer
124 views

Help understanding table in SAM E54 Datasheet

I apologize if this isn't the right place to ask this question, but I'm having trouble interpreting a table in the SAM E54 datasheet. I am trying to configure the size of the SmartEEPROM on an ...
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1answer
451 views

STM32L0 Hangs on writing EEPROM

I've got an STM32L073RZ and I'm attempting to write a 4 byte value to the internal 6 KB EEPROM. I'm running MbedOS 5.11.4 but attempting to use the HAL for this. Here's the code: ...
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1answer
679 views

Emulated EEPROM using STM32F030K6T6

I've got a project I'm working that is using an STM32F030K6T6. I've followed STM's example of emulated eeprom for the STM32F0xx microcontrollers, but am hitting a Hard Fault when the EEPROM_Init ...
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1answer
348 views

Help identifying a microprocessor?

I've recently started trying to reverse engineer my old car's ECU (2001 Holden Jackaroo/Isuzu Trooper with a 3.0L diesel 4jx1 engine), purely as a learning experience. I've managed to identify and ...
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1answer
177 views

SPI software select not staying low

...and a few other things. I am working my way through Geoffrey Brown's book Discovering the STM32 Microcontroller and it's largely been smooth so far. I've come across an exercise where the reader ...
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1answer
718 views

How does a memory map of a 1K EEPROM look like? [closed]

I am using a 1Kbit: The device is organized as one block of 128 x 8-bit memory. I want to understand how to it's organized and how addresses are structured? Example: I want to store the world "...
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3answers
152 views

How to build a larger ROM using smaller parts?

How can i build a 1024-bit ROM using 512-bit and smaller ROM's? Is it good idea to use a 2:1 MUX and that selects on of 2 512-bit ROM's?
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222 views

simplify external I/O memory access with small micro

I was reading atmel's AT28C256 datasheet and it states for a write operation: A low pulse on WE or CE input initiates a write cycle. The address is latched on the falling edge of WE or CE whichever ...
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1answer
191 views

How to count EEPROM wear cycles when flipping an address back and forth?

I'm trying to determine the life of some EEPROM. I will be erasing a byte (setting to 0x00, clearing a parity bit) as frequently as I will be writing to it. So if setting it to 0x00 counts as a wear ...
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1answer
133 views

Microcontroller reset

I am facing a problem of micro controller reset, I am thinking of implementing the following to find the function in which it happens, then the root cause. As soon as I enter a function I will ...
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1answer
2k views

Help identifying this chip (EEPROM?)

I have a circuit board from a Stratasys UPrint SE filament cartridge, and I'm trying to talk to the EEPROM on it. This board is unlike other Stratasys boards that I've seen people hacking with, and ...
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2answers
6k views

Is there any tool to read/write EEPROM of STM32L from the host?

I'm using STM32L152RTC6 (link to similar MCU line) with a built-in EEPROM (8k). I wonder if there's any tool that allows me to read/write the EEPROM from the host side, other than programming the MCU ...
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652 views

Play PCM stored in EEPROM without microcontroller

Is it possible to connect digital-to-audio converter with a EEPROM storing PCM data to play that data with a speaker? I am interested in a solution that does not employ any kind of microcontroller. ...
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1answer
214 views

What does “full array operation” mean for EEPROM?

What is full array operation as shown in data sheet of AT24C08B: Two-wire Serial EEPROM (page3)? What is application of that full array operation? Please help to clarify.
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4k views

Unable to use compiler built-in functions to write to dsPIC EEPROM

As I mentioned here, I've been having issues with EEPROM on dsPIC30F6012A. Since my old EEPROM library was difficult to analyze and support, I went back to square one and rewrote it using the new (...
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1answer
101 views

Where can I find the EEPROM memory in STM32 Nucleo F401RE?

I'm looking for to store and read values on STM32 Nucleo F401RE and I need to find which sector and begin address to start with. I did watch a tutorial how to do, but he's using another STM32 board. ...
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1answer
103 views

EEPROM returns 0 while trying to read anything

I'm using a CC2652r to try to read and write to an MX25R8035F EEPROM using SPI. I'm using the build in SPI driver to try and communicate with the EEPROM but while the drivers says it succeeded the ...
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1answer
453 views

Put saved data in flash of STM32 at the end of all other sections

I want to emulate EEPROM over flash of STM32F103. Is there a way to use all free flash instead of the only page? How can I initialize starting point of my EEPROM emulation so that it would be after ...
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3answers
136 views

DALI Commissioning reduction

Is there any way I can reduce the DALI commissioning? I have an Occupancy sensor, photo sensor and a switch which are DALI devices. So every time when I turn on the device it goes for commissioning ...
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2answers
99 views

Analog Bistable Memory

I am looking for a device which I do not know exists. I would like to store the state of a number of analog switches, perhaps driven by a D Type Flip Flop. I'd like to drive the flip flop and set ...
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1answer
87 views

Would a parallel EEPROM ever output a value that it does not contain?

I understand that when the address input to a parallel EEPROM changes from A to B, the output may show results that aren't the contents of either A or B, for a few nanoseconds. Are these spurious ...
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1answer
77 views

How to select specific programmer from multiple when using flashrom

I have 4 CH341A programmers connected to my laptop. They are all connected to the same USB hub. Reading the content of a SPI EEPROM works fine. How do I select the programmer (of these 4) to be used ...
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1answer
335 views

I2C-ATMEGA328p as Master and 24LC256 as slave

So i am trying to establish a connection between ATMEGA328p as Master and 24LC256 EEPROM Chip using I2C protocol. Clock is set to 100KHz SDA and SCK lines are pulled up to Vcc using 4.7K Ohm ...
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237 views

Shift address of eeprom? [closed]

I'm working with a device that reads and writes to an eeprom via I2C. It automatically uses a starting address at the bottom (beginning) and I cannot change this. But this device uses a fairly small ...
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1answer
254 views

M24LR16-E I2C EEPROM not detected during I2C scanning device

I am using the M24LR16-E EEPROM which is an I2C device: http://www.st.com/content/ccc/resource/technical/document/datasheet/56/58/3c/91/80/a4/49/89/DM00031737.pdf/files/DM00031737.pdf/jcr:content/...
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1answer
306 views

Reading and Writing to FRAM fails

I'm using the following eeprom FM25CL64 http://www.tme.eu/at/Document/f170062ad2f9464359d3dc53837256d8/fm25cl64ds_r3_2.pdf I try to write data, read data by polling but it stays in infinite loop and ...
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318 views

ATmega48PA power consumption during EEPROM write

PLEASE, PLEASE! My question is about power consumption of the CPU during EEPROM write NOT about the power supply! PLEASE! Thank you! I have a device (ATmega48PA) powered through a 150k resistor ...
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2answers
3k views

PIC32 and I2C EEPROM interface problems

I am writing code for a PIC32MX250F128B to interface with the Microchip 24LC02B EEPROM with I2C interface. I have followed the datasheet of the EEPROM, the PIC32 and section 24 of the PIC32 family ...
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1answer
401 views

Check content of EEPROM during run-time like Visual Studio

In Visual Studio, when we try to read memory location, we add breakpoints and run step by step to see what is getting read or written to a memory location. Is there a similar way, we can do it in ...
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4answers
1k views

ATmega328p and USB conection to PC

I posted the same question on StackOverflow and I was redirected here. For my project I need to be able to program the eeprom of an Atmega 328p via an USB to PC. I tried to incorporate an USBasp ...
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1answer
757 views

Writing 3 bytes data in EEPROM

In pic18f45k80, the datasheet says one can read and write a byte (8bit) data in EEPROM. I need to write 3 bytes data at once and read it back at once because that 3 bytes data consists of two ...
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1answer
1k views

Arduino EEPROM store multiple data

I just need a small help to completed my project. As my output is printing 2 result but only 1 output is saving to the eeprom. How can I save multiple data into eeprom? I'm just showing the setup and ...
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1answer
381 views

Working principle of floating gate tunneling oxide

Floating gate tunneling oxide (FLOTOX) is used in electrically alterable rom. Tunneling of charge takes place through tunneling oxide into the floating gate. What is the working principle of this? How ...
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1answer
816 views

How to effectively tackle long page write in EEPROM

I'm using C18 compiler and 24LC256 EEPROM. I would like to know how to handle Rollover case in terms of large EEPROM write.I'm writing a Routine that writes 120 Bytes every half an hour and i would ...
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1answer
778 views

Parallel NOR Flash ROM in-system programming issue (Micron M29F160)

I'm attempting to program a Micron M29F160 Flash ROM (datasheet) that is memory-mapped into a larger system, and I want to program it from the external interface of that system, but I can't seem to ...
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35 views

understanding data semantics and diagram

According to http://www.auto-diagnostics.info/pdf/ford_eectch98.pdf page 10, "The 8361 ROM chip contains 8k bytes of program memory plus 128 bytes of additional RAM." I found two diagrams ...
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47 views

PIC16F7X I2C Issues With 24AA01/24LC01B EEPROM

I have an existing PCB that is no longer supported by the manufacturer and has been plagued with software issues for years. So i don't have much control over how the board is laid out and what ...
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48 views

How to program i2c eeprom by hand?

I have a 24c02 eeprom and I want to program it. But I don't have Arduino or any microcontroler. I saw a video about program eeprom by hand, but they are parallel eeprom. This is the link of that video:...
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166 views

Replacing SD card by using EEPROM

I am using the mbed platform and to be specific, NUCLEO L073RZ. To log data, I am using SDFileSystem.cpp that is officially supported by mbed (you can find the link ...
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2answers
85 views

Separate calibration values from program

I am working on a device with an internal pump. Due to small differences in the pump's motor speed, I have to calibrate the pump. The result is a value between 0 and 1 (PWM duty cycle). The PWM is ...
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162 views

Problems programming a 29GL256

I've been experimenting with Python scripts and using an Teensy 2.0 ++ to program different flash memories. So far I've found a script to program a 29GL128, which works perfectly, but I'm trying to ...

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