Data Sheet

Check to make sure this returns a True value, which means the driver was found. If it wasn't, make

sure you have the hardware SPI jumpers set up right: for Leonardo/Mega the ICSP jumpers get

closed.

Now you can call

if (! ts.bufferEmpty())

to check if there's any data in the buffer. The touchscreen driver will store touchpoints at all times.

When you're ready to get the data, just check if there's any data in the buffer. If there is, you can

call

TS_Point p = ts.getPoint();

To get the oldest point from the buffer. TS_Point has .x .y and .z data points. The x and y points

range from 0 to 4095. The STMPE610 does not store any calibration data in it and it doesn't know

about rotation. So if you want to rotate the screen you'll need to manually rotate the x/y

points! The z point is 'pressure' and ranges from 0 to 255, we don't use it here but you can

experiment with it on your own, the harder you press, the lower the number.

Since data from the STMPE610 comes in 0-4095 but our screen is 320 pixels by 240 pixels, we can

use map to convert 0-4095 to 0-320 or 0-240. Something like

p.x = map(p.x, 0, 4095, 0, tft.width());

p.y = map(p.y, 0, 4095, 0, tft.height());

However, the touchscreen is a bit bigger than the screen, so we actually need to ignore presses

beyond the touchscreen itself. We found that these numbers reflected the true range that overlaps

the screen

#define TS_MINX 150

#define TS_MINY 130

#define TS_MAXX 3800

#define TS_MAXY 4000

So we use

p.x = map(p.x, TS_MINX, TS_MAXX, 0, tft.width());

p.y = map(p.y, TS_MINY, TS_MAXY, 0, tft.height());

instead.

One last point (pun intended!) since the touchscreen driver stores points in a buffer, you may want