does arduino nano have eeprom

 


 
Now the size of this ee problem is one kilobyte for 1024 bytes. Now it has a hundred thousand write erase cycles, so they do wear out and it’s non volatile. So if you cycle the power after you program, you EEPROM your data will be intact. Now, if you need a bigger e, probably one kilobyte – you could use one of these serial ee problems. I can see on the breadboard now the size ranges from 128 bytes to 128 kilobytes, which is quite a bit of memory and they come in the 8 pin dip package, so you can read board it easily. Now the Arduino Nano talks to the serial a EEPROM through a synchronous data link, so a clock is involved and this was made by microchip so it’s using the micro wire protocol. So if you need to use an external serial, a EEPROM in your project here are some of the common synchronous communications protocols that are available. So the first one is, I squared C, sometimes called I to see it has two control lines: a serial clock and a serial data line and a data line is bi directional, and this protocol was invented by Philips, which is the European company. The second one is SPI by Motorola it has a serial clock, a master out, a master in and a slave select line, and the third one has micro wire, which is very similar to SPI that’s by national semiconductor. It has a serial in serial out a serial clock and a chip select that both micro, wire and SPI use external pins to select multiple slave devices.

Microwire uses the chip select an SPI uses, the SS pin the slave select, and I squared C has its own. Addressing scheme built into the protocol to select multiple slave devices, okay, to read or write data to the onboard, a EEPROM on the atmega328p microcontroller. We need to ask there three registers: microcontroller an address register, a data register and a control register. Now the address register is used to enter the address location where the data byte is to be read from or written to now the data register is where the data byte is entered, for a write, operation or read from on a read operation and the control register Does all the housekeeping for the readwrite execution now I’m going to write all my code and forth so it’s interactive now have total control over the e EEPROM on my computer keyboard. Ok, here’s the data sheet for that mega 328p microcontroller. So we’re going to have a look at those three registers that we need access to to control the onboard a EEPROM. The first thing we see here is the e EEPROM address, register and there’s two 8 bit registers ones, labeled address, register, hi and that’s at address location, hex, 42 and the next one is address register low, which is as address hex 41. So this is where we enter the address location where the data byte is to be read from or written to. So, if we move down, we could see the EEPROM data register then 8 bit register, which is that address text 40.

This is where the data byte is entered for a write, operation or read from on a read operation as we go down to the third register, that’s our control register. Now this does all our housekeeping in our configuration for the readwrite execution. So you continue down. We can see bits four and five sets the mode and the mode of we’re using is the first one. There it’s called erase and write in one operation. If we continue on down, we can see bit 1 and bit to our right enables so that will start the right execution and if we continue on down to bit 0 that’s called the EEPROM read enable and I will start the read operation: ok here’s, my code, It’S written in forth, so I could control the e EEPROM interactively from my cable bored. So the first thing we see here, I’m assigning address values to address register low, an address register, high and I’m signing address values to the data register and the control register. So the first fourth word we see here is in it EEP ROM. That sets the mode that sets the mode to erase then right. So when I type in it EEP ROM bit for and bit five of the control register will be reset now. The next two words II, write and II read is the heart of this code, so on e right, if I type a byte value on the keyboard, n, then type an address and then type E right.

This byte value will be written into this address so also on e. You read if I type an address on the keyboard and type E, you read, will return back this byte value which would be from this address. So these two words II write and you read: I can use them as building blocks to build other commands, so the next command is e dump. So if I type in address you’ll return, the next 16 bytes from that address so it’s, basically a one mind, dump so II show will dump all the EEPROM. So I could see the whole EEPROM and one in one glance and erase will erase the whole EEPROM and II fill by type of byte value and type II II fill. The problem will be filled with that byte value. Okay, I have my code up and running on the Nano, so I could send it. Some commands interactively from the keyboard, so I’ll send each show which will dump the whole EEPROM on the screen. So now the EEPROM is all erased, so they’re, all one they’re, all one values, so this is a decimal dump for 255, gets FF, so change that the hex and I’ll do it again and there’s the whole dump of the EPROM and it’s totally erased all the Values are ffs, so next I’ll fill the EEPROM with the hex value a5. It takes a while don’t have a look there’s a holy problem filled with a 5, so I’ll erase that again, we’ll have a look so now let’s use erase to gain so I’ll.

Send a value to the address location, 3, f, 0 else into a 5. Now I’ll just do a one line dump now, if you see 3f0 location, is now a five, so I’ve written that to that location.

 
 

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official.arduino
2019-10-25T18:08:03+0000

Last weekend we announced that we’re working on a new development environment with advanced features. Let’s take a deeper look at what is in store for the Arduino Pro IDE!
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2019-10-25T15:12:36+0000

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Comment (9)

  1. This looks like exactly what I am looking for. I have currently set up a
    bread board with a ardruino nano 2 – 74LS595 shift registers (For 11 Address Lines)
    and a 28C16 ROM.

    I am having problems reading the data in off the data(I/O) pins. (8 I/O pins)

    I have manually programmed my EEPROM with a 0,1,2,3 at addresses 0,1,2,3. I can tell all my wiring and ROM are working correctly as when I set my Serial.println(readEEPROM(0)); to 0,1,2,3 I get the correct LEDs to light up on my data (I/O) pins.

    So I am sure that it must be a coding problem. At this point I only want to be able to read data in.

    This is my current code. The addressing portion is working. It is the reading in, that is the problem.

    https://drive.google.com/open?id=0B6LIgQzDkH8fUDR1eEloWlc3TlU

    1. Single step through your code and check the address/data values to/from the 28C16 are correct using a digital probe.
      Also ensure that pins CE and OE are low and pin WE is high when you read the data lines while addressing the EEPROM.

    2. Thanks for the suggestion. I was able to find the problem. It ended up being something very simple.

      When you set Serial.begin(57600);
      and you open your Serial Monitor, you have to set your Serial Monitor to 57600 at the bottom right.

      This one drove me crazy. I tried everything, twice or three times,
      and I do not remember what made me see or change that setting
      but that is all it took.

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