Looking how to switch between array argument into a function

Projects Programming
1

​h​ello all...
I plowed the web without finding... but in fact I obviously did not know how to formulate the request correctly

so :
I succesffully load images stored in arrays such as "const unsigned short SUNSET[1024] = {......}" using a "drawImage(const uint16_t *data)" method. ( "drawImage(SUNSET)" for the method call )

then so far so good.

But I have a lot of images and I'm looking for the syntax that would allow me to pass the reference of a requested image to the display function, for example:
"drawImage(image_number44)" instead of "drawImage(SUNSET)"

Would you mind telling me how we do that?? (argh the pointers!)
Many thanks in advance

2

if you meant "I would like to put my image arrays into an array so that I can iterate through them" then either:

  • create a 2D array -> maybe not ideal since you image array sizes may vary
  • or a array of pointer.

the latter seems to be more suitable.

hope that helps...

3

First, those images must be stored in flash, with a syntax similar to:

const unsigned char IMAGE_BLACK_0[5808] PROGMEM = { /* 0X01,0X01,0X08,0X01,0XB0,0X00, */

And you would repeat the array matrix by simply incrementing the name of the array:
IMAGE_BLACK_0, IMAGE_BLACK_1, IMAGE_BLACK_2, ...

The main program would call the named array as:

epd.DisplayFrame(IMAGE_BLACK_0, IMAGE_RED);
epd.DisplayFrame(IMAGE_BLACK_1, IMAGE_RED);
epd.DisplayFrame(IMAGE_BLACK_2, IMAGE_RED);

Many of the vendor's graphic examples show this in detail. Just extend their examples.

The code above was snatched from a 3-color eInk display:
https://github.com/Seeed-Studio/Grove_Triple_Color_E-lnk_2.13/blob/master/examples/Eink_factory_code_213/Eink_factory_code_213.ino

4 
const unsigned short MOONRISE[] = {......};
const unsigned short SUNSET[] = {......};

const unsigned short *images[] =
{
MOONRISE,
SUNSET
}

drawImage(images[0]);  // MOONRISE
drawImage(images[1]);  // SUNSET
1 Like
5

Seems like all the answers match...
the last one is turnkey! I try this right away and I report
thank you already to you three

EDIT Works fine !! many thanks !! have a good evening

6

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