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Clean up TFT / Touch code (#18296)

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This commit is contained in:
Victor
2020-06-15 22:51:12 -03:00
committed by GitHub
parent 884e2146a1
commit 6d571a547c
4 changed files with 37 additions and 9 deletions
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36
Marlin/src/feature/touch/xpt2046.cpp
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@ -25,6 +25,29 @@
#include "../../inc/MarlinConfig.h"
#include "../../lcd/dogm/ultralcd_DOGM.h" // for LCD_FULL_PIXEL_WIDTH, etc.
/*
* Draw and Touch processing
*
* LCD_PIXEL_WIDTH/HEIGHT (128x64) is the (emulated DOGM) Pixel Drawing resolution.
* TOUCH_SCREEN_WIDTH/HEIGHT (320x240) is the Touch Area resolution.
* LCD_FULL_PIXEL_WIDTH/HEIGHT (320x240 or 480x320) is the Actual (FSMC) Display resolution.
*
* - All native (u8g) drawing is done in LCD_PIXEL_* (128x64)
* - The DOGM pixels are is upscaled 2-3x (as needed) for display.
* - Touch coordinates use TOUCH_SCREEN_* resolution and are converted to
* click and scroll-wheel events (emulating of a common DOGM display).
*
* TOUCH_SCREEN resolution exists to fit our calibration values. The original touch code was made
* and originally calibrated for 320x240. If you decide to change the resolution of the touch code,
* new calibration values will be needed.
*
* The Marlin menus are drawn scaled in the upper region of the screen. The bottom region (in a
* fixed location in TOUCH_SCREEN* coordinate space) is used for 4 general-purpose buttons to
* navigate and select menu items. Both regions are touchable.
*
* The Marlin screen touchable area starts at LCD_PIXEL_OFFSET_X/Y (translated to SCREEN_START_LEFT/TOP)
* and spans LCD_PIXEL_WIDTH/HEIGHT (scaled to SCREEN_WIDTH/HEIGHT).
*/
// Touch screen resolution independent of display resolution
#define TOUCH_SCREEN_HEIGHT 240
#define TOUCH_SCREEN_WIDTH 320
@ -33,8 +56,13 @@
#define BUTTON_AREA_TOP 175
#define BUTTON_AREA_BOT 234
#define SCREEN_START_TOP ((LCD_PIXEL_OFFSET_Y) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
#define TOUCHABLE_Y_HEIGHT (BUTTON_AREA_TOP - (SCREEN_START_TOP))
#define SCREEN_START_TOP ((LCD_PIXEL_OFFSET_Y) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
#define SCREEN_START_LEFT ((LCD_PIXEL_OFFSET_X) * (TOUCH_SCREEN_WIDTH) / (LCD_FULL_PIXEL_WIDTH))
#define SCREEN_HEIGHT ((LCD_PIXEL_HEIGHT * FSMC_UPSCALE) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
#define SCREEN_WIDTH ((LCD_PIXEL_WIDTH * FSMC_UPSCALE) * (TOUCH_SCREEN_WIDTH) / (LCD_FULL_PIXEL_WIDTH))
#define TOUCHABLE_Y_HEIGHT SCREEN_HEIGHT
#define TOUCHABLE_X_WIDTH SCREEN_WIDTH
#ifndef TOUCH_INT_PIN
#define TOUCH_INT_PIN -1
@ -98,10 +126,10 @@ uint8_t XPT2046::read_buttons() {
: WITHIN(x, 242, 305) ? EN_C
: 0;
if (x > TOUCH_SCREEN_WIDTH || !WITHIN(y, SCREEN_START_TOP, BUTTON_AREA_TOP)) return 0;
if (x > TOUCH_SCREEN_WIDTH || !WITHIN(y, SCREEN_START_TOP, SCREEN_START_TOP + SCREEN_HEIGHT)) return 0;
// Column and row above BUTTON_AREA_TOP
int8_t col = x * (LCD_WIDTH) / (TOUCH_SCREEN_WIDTH),
int8_t col = (x - (SCREEN_START_LEFT)) * (LCD_WIDTH) / (TOUCHABLE_X_WIDTH),
row = (y - (SCREEN_START_TOP)) * (LCD_HEIGHT) / (TOUCHABLE_Y_HEIGHT);
// Send the touch to the UI (which will simulate the encoder wheel)