Arduino Pro Mini on Low memory

Using Arduino Microcontrollers
1

Hi guys,
I've a code of which i want to run on Arduino Pro mini, but the space in Atemga328p-Au is not enough to hold my code it's showing me this error in console

Sketch uses 31,806 bytes (98%) of program storage space. Maximum is 32,256 bytes.
Global variables use 2,203 bytes (107%) of dynamic memory, leaving -155 bytes for local variables. Maximum is 2,048 bytes.

shall i use external flash memory.?

Please Help

Thanks

2

shall i use external flash memory.?

Maybe, depends on the nature of the data and it's use but external memory of any kind is not a good substitute for internal and often not a substitute at all.

I know it's a large program, but can you attach the file, it's quite likely that someone more experienced can point to areas that can be optimized.

3

You basically can't store variables or run code from external flash. The memory can only be used to store data. Like if you have a code with lots of messages being printed on the serial, those messages you ight be able to store on the Flash, but you'll need to also write some code and a buffer to read and print back to the user.

Have you tried to optimise your code already? Things like using uint8_t instead of unsigned int where it suits. Reducing the number of Serial.print, and using the F() macro as well.

Have a look on this doc from Atmel Application Notes | Microchip Technology

If you're using lots of libraries might worth checking alternatives or removing any unused feature. Many libraries are very hungry for memory.

4

Might be time to go to a '1284P with 128K flash and 16K SRAM
http://www.crossroadsfencing.com/BobuinoRev17/

931×914 335 KB

Or a thru hole version
1002×582 70.8 KB

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Don't forget basic memory use optimization - Gammon Forum : Electronics : Microprocessors : Putting constant data into program memory (PROGMEM)

6

Show us your code, maybe we can find a few hundred bytes of sram. Did you use the 'F()' macro ?
Did you try the newest Arduino IDE 1.6.10 ? It has -flto enabled by default, that makes smaller code and less usage of sram.

7

mudassir9999:
Hi guys,
I've a code of which i want to run on Arduino Pro mini, but the space in Atemga328p-Au is not enough to hold my code it's showing me this error in console

shall i use external flash memory.?

Please Help

Thanks

If you do not know what is causing your storage issues... just move up the product line to an Arduino Mega2560 or one of the 3rd party 1284 boards.

If you want to optimize the existing program, then DrAzzy/Koepel make good suggestions ... start reading and studing coding techniques.

Ray

8

Hello Guys thank you for your replies
I've optimized my code upto my levels now it's using

Sketch uses 27,434 bytes (85%) of program storage space. Maximum is 32,256 bytes.
Global variables use 1,853 bytes (90%) of dynamic memory, leaving 195 bytes for local variables. Maximum is 2,048 bytes.

But still there's a problem of stability

@Crosswords thank you for your suggestion, Can i have a bootloader of it on internet.?

Thanks

9

"Can i have a bootloader of it on internet.?"
I don't know what that means.
I bootload the chips before I send them.
You can add 1284P to the IDE for programming, check out how here
https://forum.arduino.cc/index.php?topic=402335.0

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