After Touch Screen Calibration

[dhionnystrauss]

[RudolphRiedel]

Hello, check my examples, in the tft.c there is calibration code.

EVE_cmd_dlstart();
EVE_clear_color_rgb(BLACK);
EVE_clear(1, 1, 1);
EVE_cmd_text((EVE_HSIZE/2), 50, font_size, EVE_OPT_CENTER, "Please tap on the dot.");
EVE_cmd_calibrate();
EVE_display();
EVE_cmd_swap();
EVE_execute_cmd();

In short, CMD_CALIBRATE needs to be the last command in the display list since the EVE chip takes over at this point.
And you need to wait for the calibration to finish which requires user interaction.

In you snippet above you start a display list, issue CMD_calibrate, immediately start a new display list,
I wonder if that even executes CMD_CALIBRATE.

And after the code executed you can read back the calibration values to store them.

[RudolphRiedel]

That is more personal preference, this worked out ok for me and I kept it.
The refresh needs to be slower than the framerate with is 60Hz typically -> 16.667ms.
So I put my scheduler on 5ms to count 20ms.

An alternative would be to use 1ms ticks, do the main tasks in the first 18 tickts, read the touch, refresh the screen, repeat.

[dhionnystrauss]

Rudolph, I tried to download this Example and run it in PlatformIO, but it showed Errors because it seems it was developed for Espressif-IDF. So, I am trying to set up the Example in PlatformIO based on the EVE_HelloWorld_Arduino_PlatformIO_ESP32_EVE_NHD_50 Okay. I will ask you for some details regarding this. Okay. Thank you.

[RudolphRiedel]

The "static background" thing is an example on how to optimize display list refresh, put all the things that are not changing in a display list snippet and add that to the current list, for the most part this save SPI traffic.
To take that further, one could have multiple snippets for different things, as long as the snippet is longer than the 12 bytes needed to transfer the cmd_append you are reducing the SPI traffic.

[dhionnystrauss]

I wanted to mention you, as I used before in some small screens, it was showing all the Screen dynamic and actually it was Okay. Would this be possible just for starting for the FT812?

[RudolphRiedel]

Whatever works for you, I originally developed this when I was still using 8 bit controllers without DMA and limited SPI clock, I needed to keep the screen updates taking not more than 1ms in order to make the rest of the application also work.

[RudolphRiedel]

I don't believe you really need my help to figure that out. :-)
My example code for Arduino is using loop() in a non blocking way using millis() for the timing, just use your version of read_touch() and displaytft() in a similar manner.

[dhionnystrauss]

Do you mean this example /EVE_Test_Arduino_PlatformIO/src/EVE_Test.cpp Rudolph? Thank you so much.

[RudolphRiedel]

Yes, that is what I am generally using for Arduino.

[RudolphRiedel]

You are running within loop() as fast as it can go, so you are very likely running the refresh faster than the display can handle.
For starters, put in a delay(20) after the displaytft(); call to see if that makes a difference.

On a unrelated note, what's up with all the EVE_cmd_romfont(1, 34); lines?

[dhionnystrauss]

Hello Rudolph, I wanted to greet you. Also, wish you a wonderful Weekend. Greetings!