ESP8266 Community Forum

I have some large arrays in my sketch (24 bit image data) and I've run out of ram. I'm using a Wemos D1 R2.
It looks like using spiffs is the best way to store them - is that a good way to go?

I can save a text file into a data folder and read it in my sketch, output it to the serial monitor.
I'm wondering the best way to read the data into an array.
A text file means parsing each byte and converting it into numerical values. This seems inefficient.
I guess I could write the file from a sketch byte by byte - this would make it easier.

Any hints or pointers,

Thanks

It is not clear what you wish to do with this array which is actually an image.
Are you sending it to a LCD display or a Web page ?

SPIFFS.read() and SPIFFS.write() can handle binaries bytes directly, so you can have a buffer with specific size, such as 1024 or 2048, and simply loop until end-of-file.

Take a look at this post which describes how to send files to browser :
viewtopic.php?p=57118#p57118

I want to load the image data into an array so I can loop through it and send it to a strip of LEDS for a persistence of vision display. Each array has 7744 24 bit colour values. I read them from the array 44 at a time and send them out to the pixels.

Thanks for the example but I don't really understand it, sorry.
Is there an example of the write function somewhere?

Sorry if the code didn't help you.

For POV, @mkeyno is trying to do similar things, search about his posts ...

From what I've remember, he got stuck about SPIFFS speed performance, but I suggest him to use Plain Flash Raw Read instead.
Maybe he achieve some steps forwards since then...