201 lines
6.5 KiB
C++
201 lines
6.5 KiB
C++
/**
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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 <http://www.gnu.org/licenses/>.
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*
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*/
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#include "../../inc/MarlinConfigPre.h"
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#if ENABLED(TOUCH_BUTTONS)
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#include "xpt2046.h"
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#include "../../inc/MarlinConfig.h"
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#if ENABLED(FSMC_GRAPHICAL_TFT)
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#include "../../lcd/dogm/ultralcd_DOGM.h" // for LCD_FULL_PIXEL_WIDTH, etc.
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#endif
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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_SCREEN_WIDTH/HEIGHT (320x240) is the Touch Area resolution.
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* LCD_FULL_PIXEL_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_SCREEN_* 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 LCD_PIXEL_OFFSET_X/Y (translated to SCREEN_START_LEFT/TOP)
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* and spans LCD_PIXEL_WIDTH/HEIGHT (scaled to SCREEN_WIDTH/HEIGHT).
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*/
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// Touch screen resolution independent of display resolution
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#define TOUCH_SCREEN_HEIGHT 240
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#define TOUCH_SCREEN_WIDTH 320
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// Coordinates in terms of touch area
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#define BUTTON_AREA_TOP 175
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#define BUTTON_AREA_BOT 234
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#define SCREEN_START_TOP ((LCD_PIXEL_OFFSET_Y) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
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#define SCREEN_START_LEFT ((LCD_PIXEL_OFFSET_X) * (TOUCH_SCREEN_WIDTH) / (LCD_FULL_PIXEL_WIDTH))
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#define SCREEN_HEIGHT ((LCD_PIXEL_HEIGHT * FSMC_UPSCALE) * (TOUCH_SCREEN_HEIGHT) / (LCD_FULL_PIXEL_HEIGHT))
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#define SCREEN_WIDTH ((LCD_PIXEL_WIDTH * FSMC_UPSCALE) * (TOUCH_SCREEN_WIDTH) / (LCD_FULL_PIXEL_WIDTH))
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#define TOUCHABLE_Y_HEIGHT SCREEN_HEIGHT
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#define TOUCHABLE_X_WIDTH SCREEN_WIDTH
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#ifndef TOUCH_INT_PIN
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#define TOUCH_INT_PIN -1
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#endif
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#ifndef TOUCH_MISO_PIN
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#define TOUCH_MISO_PIN MISO_PIN
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#endif
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#ifndef TOUCH_MOSI_PIN
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#define TOUCH_MOSI_PIN MOSI_PIN
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#endif
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#ifndef TOUCH_SCK_PIN
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#define TOUCH_SCK_PIN SCK_PIN
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#endif
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#ifndef TOUCH_CS_PIN
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#define TOUCH_CS_PIN CS_PIN
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#endif
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XPT2046 touch;
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void XPT2046::init() {
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SET_INPUT(TOUCH_MISO_PIN);
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SET_OUTPUT(TOUCH_MOSI_PIN);
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SET_OUTPUT(TOUCH_SCK_PIN);
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OUT_WRITE(TOUCH_CS_PIN, HIGH);
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#if PIN_EXISTS(TOUCH_INT)
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// Optional Pendrive interrupt pin
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SET_INPUT(TOUCH_INT_PIN);
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#endif
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// Read once to enable pendrive status pin
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getInTouch(XPT2046_X);
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}
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#include "../../lcd/ultralcd.h" // For EN_C bit mask
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uint8_t XPT2046::read_buttons() {
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#ifdef HAS_SPI_LCD
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int16_t tsoffsets[4] = { 0 };
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if (tsoffsets[0] + tsoffsets[1] == 0) {
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// Not yet set, so use defines as fallback...
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tsoffsets[0] = XPT2046_X_CALIBRATION;
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tsoffsets[1] = XPT2046_X_OFFSET;
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tsoffsets[2] = XPT2046_Y_CALIBRATION;
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tsoffsets[3] = XPT2046_Y_OFFSET;
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}
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// We rely on XPT2046 compatible mode to ADS7843, hence no Z1 and Z2 measurements possible.
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if (!isTouched()) return 0;
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const uint16_t x = uint16_t(((uint32_t(getInTouch(XPT2046_X))) * tsoffsets[0]) >> 16) + tsoffsets[1],
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y = uint16_t(((uint32_t(getInTouch(XPT2046_Y))) * tsoffsets[2]) >> 16) + tsoffsets[3];
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if (!isTouched()) return 0; // Fingers must still be on the TS for a valid read.
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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 (x > TOUCH_SCREEN_WIDTH || !WITHIN(y, SCREEN_START_TOP, SCREEN_START_TOP + SCREEN_HEIGHT)) return 0;
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// Column and row above BUTTON_AREA_TOP
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int8_t col = (x - (SCREEN_START_LEFT)) * (LCD_WIDTH) / (TOUCHABLE_X_WIDTH),
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row = (y - (SCREEN_START_TOP)) * (LCD_HEIGHT) / (TOUCHABLE_Y_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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bool XPT2046::isTouched() {
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return (
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#if PIN_EXISTS(TOUCH_INT)
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READ(TOUCH_INT_PIN) != HIGH
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#else
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getInTouch(XPT2046_Z1) >= XPT2046_Z1_THRESHOLD
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#endif
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);
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}
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uint16_t XPT2046::getInTouch(const XPTCoordinate coordinate) {
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uint16_t data[3];
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OUT_WRITE(TOUCH_CS_PIN, LOW);
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const uint8_t coord = uint8_t(coordinate) | XPT2046_CONTROL | XPT2046_DFR_MODE;
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for (uint16_t i = 0; i < 3 ; i++) {
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for (uint8_t j = 0x80; j; j >>= 1) {
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WRITE(TOUCH_SCK_PIN, LOW);
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WRITE(TOUCH_MOSI_PIN, bool(coord & j));
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WRITE(TOUCH_SCK_PIN, HIGH);
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}
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data[i] = 0;
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for (uint16_t j = 0x8000; j; j >>= 1) {
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WRITE(TOUCH_SCK_PIN, LOW);
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if (READ(TOUCH_MISO_PIN)) data[i] |= j;
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WRITE(TOUCH_SCK_PIN, HIGH);
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}
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WRITE(TOUCH_SCK_PIN, LOW);
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data[i] >>= 4;
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}
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WRITE(TOUCH_CS_PIN, HIGH);
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uint16_t delta01 = _MAX(data[0], data[1]) - _MIN(data[0], data[1]),
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delta02 = _MAX(data[0], data[2]) - _MIN(data[0], data[2]),
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delta12 = _MAX(data[1], data[2]) - _MIN(data[1], data[2]);
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if (delta01 <= delta02 && delta01 <= delta12)
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return (data[0] + data[1]) >> 1;
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if (delta02 <= delta12)
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return (data[0] + data[2]) >> 1;
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return (data[1] + data[2]) >> 1;
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}
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bool XPT2046::getTouchPoint(uint16_t &x, uint16_t &y) {
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if (isTouched()) {
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x = getInTouch(XPT2046_X);
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y = getInTouch(XPT2046_Y);
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}
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return isTouched();
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}
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#endif // TOUCH_BUTTONS
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