Atmega328 and Atmega168 MCUs haven't an external memory interface, which will took away 19 I/O pins if exists. Project owner will be notified upon removal. the linked linux project uses the original code that is the inspiration for the ASM version you see here. And 32K is the biggest SRAM IC, that could been used without losses, due to internal RAM and registers address space of 8 Kb and without bank switching. RTCMemory: A class to facilitate the management of data persistence across different memory hierarchy (RAM, RTC memory and flash memory) on ESP8266; RTCVars: This library eases the storage of variables in reset-safe RTC memory. please! You can declare multiple arrays or simple variables: It's possible to use external memory for example with some libraries: Create an account to leave a comment. Can’t simply tie them to fix level as the address pins are also used for sending commands. Sure people will continue to hack on it but anyone starting from scratch will be much better served by more modern architectures like ARM. Perhaps use the Xmem system.. Ahh.. here’s the link: Really cool. RadxaRock $100 <- Very green board with a growing community. But pretty much precludes generic real-time I/O. The arduino due has plenty of IO for interfacing. 1st. And gives you ready-made drivers to access consumer peripherals that can do something useful with all the data it will be processing. There’s no need to reinvent the wheel, but you can’t design the next big sports car if you don’t understand wheels. Test program from this page gives an example. Yes, that is too much to ask. 3.3V logic level This library enables you to read and write those bytes. Now, I had a bad 74LS373 latch - and guess what - I read back the lower 8 address bits = same as extected data value => test program said all is ok! That took my hours to find that out! - Use a larger Arduino module. Needing 130-odd pins wiring up is probably a hindrance to the hobbyist market, and the borderline-magickal routing requirements. WE figured this because this site’s name is HACKADAY! Notice that the ‘duinos have been migrating mostly to SMT packages only. These all make atmega look sick in comparison. And I use a mega for my #Arduino Desktop. Don’t think they make 16MBytes in that format, but still, it’s in the same sortof ballpark. My footprints on the F silkscreen have the U shaped notch at the 1 end and also the 1 copper pad is square. choose option 1 in menuconfig SPIRAM_USE_MEMMAP to enable this mode. Enrico Gueli has added a new log for TV Speaker IR. Between 2 & 3, you are spending a lot of time talking to the chip. WARNING: using this kind of RAM will put your Arduino CPU to refresh the SIMM RAM data part of the time. Hi, dmitry the external RAM could be mapped like native ram, and use malloc or free functions?. It means that your sketches (programs) could run a little slower than before. Compatible GPIO pins, move critical function to RAM with IRAM Perhaps only command-line options will be needed. Connect the 30-pin SIMM RAM like schematic.txt file explains. Enrico Gueli has updated the project titled TV-to-MusicCast IR controller. The Arduino IDE helps by estimating the static ram required (variables etc) but it can’t know how the stack and heap will effect things. Back at the height of RAM pricing, just a little while before VLSI chips adopted the pricing model of jellybeans. Where are these microcontroller RAM parties you mention? Would it be possible to cut a slot in the shield so the debugger cable can reach  down to the ICSP pins on the Mega 2560? They are also the hardest to diagnose. Second 74LS373 was also bad - but third one was fine and now it runs as expected. led to a simple hack that allows full use on the Mega. Haven’t had such a good laugh for years…. lol). Not a member? We make this dedication for the benefit * of the public at large and to the detriment of our heirs and * successors. They are both clock edges, so actual clock rate is 1/2. His work was actually based on the great Linux on the 8bit ATMEGA168 hack from [Dmitry Grinberg] but some tweaks were required to make it work with [Rapfael]’s SIMM but also to port it to the Arduino platform. Aaah, I remember those! Then again there probably aren’t many uses for 16MB of data on a microcontroller like that, otherwise they’d make them that way. PS: Now my apple 1 emulator also has 32k memory ;-). hack, as in poorly executed modification FFS Why not have the arduino page the memory so that it can get EVEN MORE than 32k? The Mega 2560 board can be programmed with the Arduino Software (IDE).For details, see thereference and tutorials.. Learn about the communication methods between two or more Arduinos using UART or I2C. You could always code bare metal, and then you can do whatever you want with all its capabilities. Suppose we need an array of 8192 float values to write values from some probes. If only grandma would have let you come up from the basement! The RAM famine of the early 90s, it was terrible! Log In. Learn more, Using SIMMs To Add Some Extra RAM On Your Arduino UNO,,,,,, Arduino-Storage. Have a read of [link][/link] for the why and how. The shield based on that design was sold for near 50$ as long as good MEGA clones cost less then 10$. Or if not "RAM", some volatile memory (let's call it "RAM2") that would be 10 times faster than reading an SD card. Commands are synchronous, so you’ll need extra cycles to toggle the clock. I think elm-chan should get some cred here too ;-), I must have a ton or so of old SIMMs that I really should have thrown away ten years or so ago. Remember RAM compression software, too? Using external RAM with WROVER WROVER External RAM modes mode 1. RasPi *kind* of does this but not reallllly. we come here to share non practacle projects because we all like reading about non practacle things. Volatile memory is usually in the form of RAM or Random Access Memory. a member for this project? i appreciate it. Hardware components: Arduino UNO × 1: Buy from Newark; Buy from Adafruit; Buy from Arduino Store; Buy from CPC; ATmega2560-16CU × 1: Story . Not sure why anyone want to access large memory array in a 8-bit processors. to get you to do shoddy work on the job. The microcontroller on the Arduino and Genuino AVR based board has EEPROM: memory whose values are kept when the board is turned off (like a tiny hard drive). At $24 with a QVGA LCD that thing is a steal! The DUE board pins out the data bus on the extended digital headers along with the control signals NCS1 and NWR. In any case, 40 Kb continuous address space is much bigger then internal 8 Kb. The Arduino gives you a taste of the power of embedded system. The second way is to place heap memory area to external memory: At the begining we set 2 internal avr-libc variables to the external memory boundaries: After that simple variables as objects, declared at the module level or inside functions will be placed at the 8192 bytes of AVR internal RAM, but all dynamic variables and objects will be placed at external memory. all of those struggle barely reachiung ~500KB/s with most of the time spent refreshing. The memory interface makes for a fun weekend project, and I don’t feel bad soldering to the DIMM (yes, you can do this with somewhat more modern memory too) just for kicks since it was going to be ewaste anyway. An Arduino UNO Flash and RAM update with the ATmega2560 as DIL 28 variant. Speed versus power consumption : the old dilemma... Looks very useful. Proof of concept? The idea of doing this with an AVR is at least 10 years old though. Our guess it that an SPI / I2C IO extender could lift this limitation. But if the MCU clock is slower or RAM access time is not a bottleneck, I think it's possible to use 70 ns RAM with 2 clocks wait state settings. Ordinarily this would require a lot of pins: 16 for the address lines, 8 for the data lines plus another 2 at least for the control lines. YOU are the weird one here! Yes, at least Atmega1280, Atmega2560, Atmega128 and some legacy mcus has an external memory interface with 8 bit data bus and 16 bit address, but the address bus requires a buffer because most and least signed address bytes are placed on the bus sequentionally to save pins. wait, is it because you only refresh 256KB? Well, his comment helped me at least. To make the experience fit your profile, pick a username and tell us what interests you. nobody is forcing you to read this site EVERY DAY. This is not for bit-banging in software. ;). I have often though of ideas like this but never got around to working out how to make it happen. The test program supplied at above link is using the following test: for (uint16_t i = 0; i<32768; ++i) {    extmem = i & 0xFF;  }  for (uint16_t i = 0; i<32768; ++i) {    if (extmem != (i & 0xFF))      return false;  }  return true;}The problem here is and was in my case, that the data value is the SAME as the lower 8-bit of the address!Thats a bad idea with a multiplexed data/address bus. We’re using a 256kbit eeprom which is actually 32kbytes of space. ... Usually this is expensive (a few KB of external RAM costs in general more than the MCU) and requires also advanced hardware and software skills. You are thinking of DDR with terminations. Combine the two and get the best of both worlds. I glad if my humble efforts were useful. If your program is failing in an otherwise inexplicable fashion, the chances are good you have crashed the stack due to a SRAM shortage. 262,144 bits / 8 bits in a byte = 32,768 bytes. There are a number of things that you can do to reduce SRAM usage. Well, there’s the latest STM F4 Discovery board, it comes with 2GB of flash, 256K of onboard and 8MB of external RAM, a 2.4″ LCD screen with touch encoder and an ARM M4F (with hardware floating point) @180MHz for less than £25. I love the Arduino UNO with the DIL 28 ATmega328. If there was pain and frustration involved, it was not pointless, because some experience has been gained. based on your interests. 1. I am wondering if there are any other good ways to work with external memory. Or is it just stabbing in the dark like a mad man at something that, yes is possible, but makes you look like a raving lunatic for trying when there is a better way and has been for years? Tons of IO, some IO routable to one of the two DMA capable 200MHz real time coprocessors (PRU), 512MB RAM, 2GB onboard flash plus microSD, 1GHz Cortex-A8, HDMI out, Ethernet, USB HS host and device, onboard power controller with soft power off support and LiPo/LiIon charging. YEEEAAAH!! Debian, Android, Ubuntu, and many more Linux distros supported by a large community. Sorry, this design has no passthrough ICSP socket. As your Arduino projects get more sophisticated, they tend to grow to the point where memory limitations can become a problem. But you But you should first take a look through the next few pages to better understand Arduino memory and how it works. YOU are the misfit here! Hmm what version Kicad are you using? Parts: 1x MICROCHIP SST39SF010A-70-4C-PHE Flash Memory from Element 14. For 256 or 512K of SRAM there’s better options now. Of course, a sensible person would use a serial RAM on this type of micro, not a parallel one. Too dense pins maybe? In this new course, I will teach you how you can use your Arduino internal memory EPROM and how you can add extra memory to permanently store data with your Arduino. As you already linked, several people have already unofficially supported it. Like seeing if you can screw your feet down to the floor using sheet rock screws and a gold ol’ manual screwdriver… Completely pointless and hours of pain and frustration all so you can say “I new I could do it!” and hopefully post it to youtube to impress your hipster friends.Just imagine if these people dedicated all that effort and brain power into something useful!!! If you have the skills to actually use the features you spec’d it should be trivial for you to design and populate a board. You get a bit more RAM, but basically make the controller useless, because it is wasting all time refreshing the DRAM and all its pins are taken up by the RAM interface …. Arduino IDE sketch for testing the shield on different wait states. Programming the Arduino Nano Every. fast processor – check It adds 32Kb to internal 8Kb of Atmega2560 and allows to run much more complex programs on the board.Terminal-BASIC interpreter from, 8-32 channel TI ADS1299 Arduino shield for EEG, EMG, and EKG bio-signals acquisition. The library includes device drivers for SPI SRAM (23LC512/1024), 2-Wire EEPROM (AT24CXX) and internal EEPROM. you keep coming back to post, every day about how this site is not good enough for you. But now I’m glad I didn’t :-). Short answer: cost, power consumption, I/O flexibility, etc. 2x 74HC595 Shift Register from Adafruit. In the Arduino IDE versions prior to 1.6.2 you only had access to read, write, and update which only supported reading or … 04/28/2017 at 15:18. * * Anyone is free to copy, modify, publish, use, compile, sell, or * distribute this software, either in source code form or as a compiled * binary, for any purpose, commercial or non-commercial, and by any * means. [Rafael] just made a little library that allows you to interface these modules to the Atmega328p-based Arduino UNO in order to gain some memory space. like, 512k? Higher overhead. 1x MCP23008 I/O Expander from Adafruit. A simplest possible SRAM expansion for Arduino MEGA 2560 compatible boards. Therefore, there are two simplest ways to use external memory on Arduino MEGA. Many thanks for this pcb 32k memory expansion! Is that too much to ask? This project was CubieTruck $100 <- A20 based alternative with what appears to be good support But then we’d have fewer pictures of cats with bread mushed over their cute little heads and less arduinos running TRS-80 emulations. It communicates using the original STK500 protocol (reference, C header files). 200MHz parts (or slower parts?). And, I think, the extarnal RAM access time must be less then 30 ns to use no wait state operations on 16MHz clock (which in any case are 30% slower then operations with an internal SRAM). Dave's Dev Lab wrote a reply on ISA 8-Bit Video Experiments. Already have an account? 2%??? Although SRAM shortages are probably the most common memory problems on the Arduino. I'v noticed this problem too while testing my boards and now I changed the test code with your corrections. For CH552, the internal one is only 256 bytes, and the external one is 1024 bytes. sounds pretty useful to me. So, why go through all the effort of officially designing something and coding in official support when most people wouldn’t buy the board? created on 04/28/2017 BASIC computer, based on the prototype board soldered version: x-tar-gz - look at the linked linux project! 23LCV1024? I think you can get DDR 400 i.e. please link me to a $10(how much that SIMM stick costs) SPI RAM in the 16MByte range. 46.39 kB - Another idea I had was to use not only RAM, but SRAM pin-compatible EEPROM chips, like the AT28C256. There is an outstanding design, based on the AS7C4096A 512 Kb SRAM IC. Because not all of us have reached the status of “Advanced God” when it comes to electronics. Needs more IO. The trick is to connect the data out lines to the address lines with 47 ohm resistors to reduce pin count and avoid shorting the RAM outputs to the MCU port when bashing through an address. i refresh all of ram, and do so in a very tight asm loop. How many I/O pins are used by the RAM? Can we get an Arduino like thing with lots of IO AND a fast processor AND megs of ram for $30 or so? go look at it. This Arduino library is for use with flash and FRAM memory chips that communicate using the SPI protocol. You can easily interface the external EEPROMs with the Arduino Boards using the I2C bus. The Arduino compatible External EEPROM chips are not that fast as the Arduino’s internal EEPROM, but if you need more capacity and larger write-cycle tolerance than the 100,000 writes then the Arduino External EEPROM is the only choice you are left with. Become a member to follow this project and never miss any updates, About Us Send me a message and I'd be very interested. No, it doesn't. Although using e.g. Reading – output row address, RAS low, output column address CAS low, switch your AVR port to input, read the data in, RAS and CAS high. You can use it to store files and log sensor data. Create a new linker script that and.bss into the address space occupied by external RAM. To cut down on this requirement the ATmega multiplexes the lower 8 address lines with the 8 data lines, saving on 8 pins. So yes, if you wanted 16MB RAM on an 8-bit MCU with only a couple of pins for actual I/O, then yes, this would be cheaper. I’m still amazed about that there isn’t a official Arduino based on the DIP version of ATmega1284P Computers and microcontrollers need memory to store data, either permanently or temporarily, and while this memory can come in a variety of forms it can be divided into two basic types – volatile and nonvolatile. 3. I thought these old rams were static not dynamic. Look at some of the smaller ARM chips like the STM32F10x or STM32F30x series. Mega gives you 8kB of fast RAM, it also locks you in Mega module - you can't just pop the chip out of it and use it elsewhere. 1. For example, what variable will come in and out of existence and when. (to satisfy #2.) It meets these requirements and even let’s you code in Arduino-like C++. * * In jurisdictions that recognize copyright laws, the author or authors * of this software dedicate any and all copyright interest in the * software to the public domain. Super important ground breaking and fun stuff! My God, people WHY?!? This site uses Akismet to reduce spam. Bet he’s the center of attention at every party he attends, With some hardware modifications you can free up a bunch of pins as well as cycles. Probably about half or a third of the price. Almost all code open source (GPU lib and power management coprocessor blobs, both optional), all design files open source, and all parts can be sourced in onesies. The obvious case is when the application program (the “sketch”) needs to store more data than will fit in available RAM. fan4tix has updated the project titled IV-25 VFD Display. No worries about the number of available IOs or keeping DRAM refreshed, and they are available in DIP packages for easy use in hobby projects. Privacy Policy The ATmega2560 on the Mega 2560 comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. Expert Showcase (no instructions) Over 7 days 25,900. Larger memory array means you are burning up lots of I/O and they need to be fast – can’t be from SPI or I2C. and you can! Or FRAM, if you want persistence. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Memory model: Unlike most modern architectures including AVR, MCS51 has 2 RAM regions, internal data memory, and external data memory. And 1MB of RAM on a serial connection is probably more use for a microcontroller than 16MB that uses up all the I/O pins. Manually allocate memory in external RAM (address starting from 0x3F800000 and up) you need to include memory management logic in your code. … Maybe some kind of LCD screen so you can actually get feedback as to what is going on. 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