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112 lines
4.1 KiB
112 lines
4.1 KiB
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include "../../inc/MarlinConfig.h"
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#if HAS_TOUCH_XPT2046
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#include "touch_buttons.h"
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#include "../scaled_tft.h"
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#include HAL_PATH(../../HAL, tft/xpt2046.h)
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XPT2046 touchIO;
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#include "../../lcd/marlinui.h" // For EN_C bit mask
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/**
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* Draw and Touch processing
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*
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* LCD_PIXEL_WIDTH/HEIGHT (128x64) is the (emulated DOGM) Pixel Drawing resolution.
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* TOUCH_SENSOR_WIDTH/HEIGHT (320x240) is the Touch Area resolution.
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* TFT_WIDTH/HEIGHT (320x240 or 480x320) is the Actual (FSMC) Display resolution.
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*
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* - All native (u8g) drawing is done in LCD_PIXEL_* (128x64)
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* - The DOGM pixels are is upscaled 2-3x (as needed) for display.
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* - Touch coordinates use TOUCH_SENSOR_* resolution and are converted to
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* click and scroll-wheel events (emulating of a common DOGM display).
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*
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* TOUCH_SCREEN resolution exists to fit our calibration values. The original touch code was made
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* and originally calibrated for 320x240. If you decide to change the resolution of the touch code,
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* new calibration values will be needed.
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*
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* The Marlin menus are drawn scaled in the upper region of the screen. The bottom region (in a
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* fixed location in TOUCH_SCREEN* coordinate space) is used for 4 general-purpose buttons to
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* navigate and select menu items. Both regions are touchable.
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*
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* The Marlin screen touchable area starts at TFT_PIXEL_OFFSET_X/Y (translated to SCREEN_PCT_LEFT/TOP)
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* and spans LCD_PIXEL_WIDTH/HEIGHT (scaled to SCREEN_PCT_WIDTH/HEIGHT).
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*/
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// Touch sensor resolution independent of display resolution
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#define TOUCH_SENSOR_WIDTH 320
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#define TOUCH_SENSOR_HEIGHT 240
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#define SCREEN_PCT_WIDE(X) ((X) * (TOUCH_SENSOR_WIDTH) / (TFT_WIDTH))
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#define SCREEN_PCT_HIGH(Y) ((Y) * (TOUCH_SENSOR_HEIGHT) / (TFT_HEIGHT))
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#define SCREEN_PCT_LEFT SCREEN_PCT_WIDE(TFT_PIXEL_OFFSET_X)
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#define SCREEN_PCT_TOP SCREEN_PCT_HIGH(TFT_PIXEL_OFFSET_Y)
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#define SCREEN_PCT_WIDTH SCREEN_PCT_WIDE((GRAPHICAL_TFT_UPSCALE) * (LCD_PIXEL_WIDTH))
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#define SCREEN_PCT_HEIGHT SCREEN_PCT_HIGH((GRAPHICAL_TFT_UPSCALE) * (LCD_PIXEL_HEIGHT))
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// Coordinates in terms of 240-unit-tall touch area
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#define BUTTON_AREA_TOP 175
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#define BUTTON_AREA_BOT 234
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TouchButtons touch;
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void TouchButtons::init() { touchIO.Init(); }
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uint8_t TouchButtons::read_buttons() {
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#ifdef HAS_WIRED_LCD
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int16_t x, y;
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if (!touchIO.getRawPoint(&x, &y)) return 0;
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x = uint16_t((uint32_t(x) * XPT2046_X_CALIBRATION) >> 16) + XPT2046_X_OFFSET;
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y = uint16_t((uint32_t(y) * XPT2046_Y_CALIBRATION) >> 16) + XPT2046_Y_OFFSET;
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#if (TFT_ROTATION & TFT_ROTATE_180)
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x = TOUCH_SENSOR_WIDTH - x;
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y = TOUCH_SENSOR_HEIGHT - y;
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#endif
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// Touch within the button area simulates an encoder button
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if (y > BUTTON_AREA_TOP && y < BUTTON_AREA_BOT)
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return WITHIN(x, 14, 77) ? EN_D
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: WITHIN(x, 90, 153) ? EN_A
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: WITHIN(x, 166, 229) ? EN_B
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: WITHIN(x, 242, 305) ? EN_C
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: 0;
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if ( !WITHIN(x, SCREEN_PCT_LEFT, SCREEN_PCT_LEFT + SCREEN_PCT_WIDTH)
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|| !WITHIN(y, SCREEN_PCT_TOP, SCREEN_PCT_TOP + SCREEN_PCT_HEIGHT)
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) return 0;
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// Column and row above BUTTON_AREA_TOP
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int8_t col = (x - (SCREEN_PCT_LEFT)) * (LCD_WIDTH) / (SCREEN_PCT_WIDTH),
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row = (y - (SCREEN_PCT_TOP)) * (LCD_HEIGHT) / (SCREEN_PCT_HEIGHT);
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// Send the touch to the UI (which will simulate the encoder wheel)
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MarlinUI::screen_click(row, col, x, y);
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#endif
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return 0;
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}
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#endif // HAS_TOUCH_XPT2046
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