arduino i2c eeprom programmer

I considered using a generic tool such as the Bus Pirate to program the EEPROMS or even investing in a generic programmer (there are a wide range available on eBay that support various MCU chips as well as EEPROMs). I'm using iBurner3.2 I2C Bus EEPROM Programmer to write and read from an I2C EEPROM MEMORY (24LC16B) using COM Port, I want to simulate the behavior of this specific I2C EEPROM… The TGL-6502 project uses an SPI EEPROM (the Microchip 25AA1024) to simulate the ROM exposed to the 6502 processor. Because of this they are all in LOW states (0v). The 24LC256, as the last 3 digits imply, gives an additional 256 kilobits of EEPROM to an arduino micrcontroller. Topic: I2C EEPROM programmer (Read 10609 times) previous topic - next topic. The test data is stored in a serial I2C EEPROM AT24C512. Welcome to the new look for the Garage Lab site - after 2 years I thought it was time…, Using some patience and taking some extra time to double check things can save a lot of problems in…. Both RTC and EEPROM communicate with the arduino sketches. ATtiny85 pin 8 to +5V (or +3.3V, but I used 5) ATtiny85 pin 4 to GND ATtiny85 pin 5 to EEPROM pin 5 (with 4.7k pull-up resistor to +5V) ATtiny85 pin 7 to EEPROM pin 6 (with 4.7k pull-up resistor to +5V) ATtiny85 pin 2 to Serial LCD EEPROM pins 1-4 to GND EEPROM pin 7 to GND EEPROM pin 8 to +5V The pull-up resistors are necessary when using the ATtiny85. So EEPROM is useful for data that should be stored between sessions (or logged in a data logging application). The tool currently provides all the functionality I need to work on the TGL-6502 but there are obviously a few enhancements that can be made. To get the content into the ROM I added a simple serial protocol to the TGL-6502 firmware but as the firmware grew this functionality had to be dropped to free up some of the limited flash memory so I had to find an alternative method. This interrupt seemed to be causing issues with the SPI communications so I disabled it in the init() function: In this case I'm not using any of the timer functions so it doesn't effect the rest of the code. Syntax. Same as above. This is the smallest amount of memory that can be written at once, once again I use the number of bits to determine the size (eg: a 32 byte page is 6 bits, 256 bytes is 8). So adding 24LC256 chip for EEPROM expansion is a significant one. If there is a partial page still in the RAM buffer it will be filled with the current contents of the EEPROM and written. If the buffer only contains a partial page the rest of the contents will be filled with whatever is already in the EEPROM allowing you to do partial page writes to patch the data in the EEPROM rather than doing a complete rewrite. The 24LC256 EEPROM chip can be obtained for a little over $1 on ebay. Arduino EEPROM vs Flash. Links to software, and explanation of how to enable english language within the gui. The USI (Universal Serial Interface) module on the ATtiny is used to implement both I2C and SPI but you can only use one protocol at a time. I wound up migrating the serial implementation from my tinytemplate library for the ATtiny85 and using that instead which gives me reliable communications at 57600 baud. Go Down. This EEPROM use 2bits for … There were a few hardware limitations of the ATtiny that needed to be worked around in software though. github.com/SpenceKonde. EEPROM stands for Electronically Erasable Programmable Read-Only Memory. Support for I2C devices is built in to the hardware but not yet implemented in the firmware. Using the ZIF socket reduces the risk of damaging the pins on the EEPROM - I had an 18 pin socket in my parts collection already, you can swap it out for two 8 pin DIP sockets if you want. The EEPROM memory has a specified life of 100,000 write/erase cycles, so you may need to be careful about how often you write to it. That software, along with the EEPROM programmer’s hardware are described in detail in the following video. This is an 8-pin DIP serial EEPROM. The programming utility for Windows could be extended to support Intel HEX format files as well as raw binary which would be useful for dealing with output from linkers. The interface is pretty straightforward. Note that the write command will buffer data into RAM until it has a full page to write to the EEPROM - you must use the DONE command to terminate a write sequence to ensure all data has actually been written. none Note. Thanks for for taking care of our observations. A lot of modern microcontrollers – such as the ATmega328 – contain some built-in EEPROM, but that doesn't mean that you can't add more! To make development a bit easier I am using an Arduino core for the ATtiny84 and the firmware is implemented as an Arduino sketch. This could be interesting in situations where you want a tag that can be re-written dynamically when connected to a controller. The TGL-6502 project uses an SPI EEPROM (the Microchip 25AA1024) to simulate the ROM exposed to the 6502 processor. The SCL pin, pin 6, of the EEPROM connects to analog pin 5 on the arduino. The format of the WRITE command is similar to the response from the READ command - a 3 byte address, a sequence of data bytes and a 2 byte checksum. Nonvolatile memory, as you may have guessed by now, retai… I didn't have a lot of luck with the Arduino SoftwareSerial library, I could not get reliable serial communications working at any speed. Attaching an EEPROM to the Arduino is quite simple and the easiest way to do that is via the I2C bus. This is a small ATtiny84 based device to program I2C and SPI EEPROM chips over a serial port. The checksum is simply a sum of all bytes in the response (excluding the checksum itself) and the lowest 16 bits of the value is used as the checksum. To get the content into the ROM I added a simple serial protocol to the TGL-6502 firmware but as the firmware grew this functionality had to be dropped to free up some of the limited flash memory so I had to find an alternative method. As described earlier, Flash memory (PROGMEM) has a lower lifetime than EEPROM. This RFID tag is really unique: it works with mobile phones just like other RFID tags, but you can reprogram it over I2C. Firstly, include the Wire library headers somewhere near the top of your sketch: /* Use 24LC256 EEPROM to save settings */ #include Then add some functions to read and write bytes from the EEPROM (I only care about individual bytes but there is a page write feature in the chip too). The repository includes a simple Windows GUI utility to control the programmer in the software/eeprog directory. The details of each command are described below, you can use a serial terminal to talk directly to the programmer but don't include the '<' and '>' characters shown in the examples - they are used to indicate the direction of the data. One problem I did have in this project is the timer interrupts - the Arduino library uses an interrupt triggered by TIMER0 for timing functions (delay(), millis() and the like). If tied to VSS 0x50. The 24C32 EEPROM uses I2C interface for communication and shares the same I2C bus as DS3231. Basic programmer. I2C_EEPROM. Each one of these is used to hardcode in the address. Example It gives great EEPROM expansion. (The Compiler IDE-1.8.0 does not like. the value stored in that location (byte) Example There are 5 available commands, outlined below: With the exception of RESET the first character of the response will indicate success ('+') or failure ('-') and there may be additional information between the result character and the end of the line. I2C EEPROM programmer - Page 2. All write sequences must be terminated with this command. EEPROM. If a jumper is shorted with solder, that sets the address. But I really only have weekends to learn the Arduino. Reading and writing to a 24LC512 external EEPROM chip with Arduino. This chip has enough IO lines to do everything needed, more than enough flash to allow for more complex firmware and is small enough to keep the board fairly compact. You send a command terminated by a line feed character and wait for a response terminated by a line feed character. Interfacing with I2C EEPROM. If you make the changes yourself (or add interesting new functionality) please send me a pull request and I'll add them to the main repository. Only two can be used in a single circuit. Some are compatible with 24-series, some are compatible with 25-series... First, run this i2c scanner program, and verify that you can see the address of the eeprom and it is what the code expects which is 0x50.

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