Color Touchscreen and LC

[Constantin]

Hi guys and gals,

Has anyone here tried to use the color touchscreen with the Teensy LC? Can it be done or will one quickly run out of RAM?

 

[defragster]

I ran my sample touchcode old example "IntTouchPaintDebLC" on the Teensy LC and it worked. Recompiling now I get these stats.

Using : #include "Adafruit_ILI9341.h"

It runs more slowly with adafruit than ILI9341_t3 - but RAM doesn't seem to be a killer issue.

On a T_3 the compile reports this::

Sketch uses 28,608 bytes (10%) of program storage space. Maximum is 262,144 bytes.
Global variables use 5,140 bytes (7%) of dynamic memory, leaving 60,396 bytes for local variables. Maximum is 65,536 bytes.

Same code compiled for LC reports this::

Sketch uses 20,184 bytes (31%) of program storage space. Maximum is 63,488 bytes.
Global variables use 2,656 bytes (32%) of dynamic memory, leaving 5,536 bytes for local variables. Maximum is 8,192 bytes.

 

[defragster]

My GitHub samples https://github.com/Defragster/XPT2046_Touch_Examples may no longer contain this but swapping in as needed this makes it work:

#define LC 1 // comment out to use ILI9341_t3

#if LC
#include "Adafruit_ILI9341.h"
#else
#include <ILI9341_t3.h>
#endif

#ifdef LC
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
#else
ILI9341_t3 tft = ILI9341_t3(TFT_CS, TFT_DC);
#endif

I pulled it out because going to multi-file sketch meant this code was needed in two places.

 

[Constantin]

You guys are awesome! Thank you!