If my above streaming approach fails, I could also try this. Wodzinski has added three new commands to the Optiboot boot loader that allow you to write pages or words or erase the memory. With a modified Optiboot boot loader by Marek Wodzinski, it has fairly recently become possible to write to Flash memory during runtime. An advantage would be that I could use an ordinary Satshakit for the device that is writing to the second because I would not need the larger memory of the Mighty (ATmega1284p).īut there is an alternative. A solution for this is to stream the hex data from the SD card and simultaneously write it out to the second device. The Flash memory cannot be written during program execution it is the same memory the program is burnt into beforehand.
![arduino mega pinout isp arduino mega pinout isp](https://arduino.pinout.guide/arduino_leonardo_pinout.png)
#Arduino mega pinout isp code
This means that, in particular, the hex code from the SD card cannot be read in its entirety into Flash memory, where it would rest until it is written out to another Arduino.
![arduino mega pinout isp arduino mega pinout isp](https://arduino.pinout.guide/arduino_promini_pinout.png)
There is a problem that is not immediately obvious: the data in the struct (see below) shall go to the Flash memory it is not being produced while the program is running. For information on what he improved, see the section "Changing the Code" on the Adafruit training website (above link) and the comments in adaStandalone.ino.Īt this time I realized that I had made a notional mistake. Tsao achieved this by changing the data format.
![arduino mega pinout isp arduino mega pinout isp](https://arduino.pinout.guide/arduino_leonardo_pinout_v2.png)
One highlight among his improvements is that the memory footprint of the hex code you feed the AVR with is now roughly half as large as that achieved by the guys at Adafruit. Another contributor, Mike Tsao, improved and extended Adafruit's further development and published the result by the name adaStandalone. The guys at Adafruit adapted Optiloader to be more flexible - so it can program any AVR with any HEX file. Optiloader is very specialized, as it lets you program only one chip (not a problem for my project) using one particular HEX file (a problem for my project). I want this function because, from a user's perspective, this looks as if he/she can select a game and then immediately play it on my video game system without the need to use a computer.īurning a hexadecimal file on an ATmega1284p using another ATmegaĪt the end of April, I did an extensive search on the An Adafruit forum user has developed a program by the name Optiloader that lets an Arduino, instead of a computer, program another chip, very fast. I am now going to check whether I can upload a hex file to a second Arduino-compatible MCU using the Atmega1284p. In the meantime, I have verified that the LED matrix panel works with the ATmega1284p. Moreover, we need to build our own board. I cannot use the Arduino Mega 2560, because I cannot solder its processor. I cannot use plain Arduino Uno's for these tasks, as they do not offer the necessary amount of memory. I want it to read hex code from an SD card and burn the hex code on-the-fly into another Arduino's flash ROM (or Arduino compatibles). Programming an Arduino with another ArduinoĪs my final project, I would like to build a video game system (VGS) with two ATmega1284p MCUs as its cores. I extended/modified an Arduino-as-ISP sketch such that it fulfils above mentioned functions.Use two SPI devices on one Arduino simultaneously.Attach an SD card reader via SPI to an Arduino, read a file from it and burn it on the second Arduino.
![arduino mega pinout isp arduino mega pinout isp](https://www.14core.com/wp-content/uploads/2015/07/Arduino-UNO-ISP-Bootload-Mini-Pro.jpg)
One serves as ISP programmer for the second. In preparation for my final project, I did following things that complete this assignment on networking (please also refer to this place).