1 files changed, 92 insertions, 0 deletions
diff --git a/Marlin/src/lcd/tft_io/touch_calibration.h b/Marlin/src/lcd/tft_io/touch_calibration.h
new file mode 100644
index 0000000..f8cbf99
--- /dev/null
+++ b/Marlin/src/lcd/tft_io/touch_calibration.h
@@ -0,0 +1,92 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include "../../inc/MarlinConfigPre.h"
+#include "tft_io.h"
+
+#ifndef TOUCH_SCREEN_CALIBRATION_PRECISION
+  #define TOUCH_SCREEN_CALIBRATION_PRECISION  80
+#endif
+
+#ifndef TOUCH_SCREEN_HOLD_TO_CALIBRATE_MS
+  #define TOUCH_SCREEN_HOLD_TO_CALIBRATE_MS   2500
+#endif
+
+typedef struct __attribute__((__packed__)) {
+  int32_t x, y;
+  int16_t offset_x, offset_y;
+  uint8_t orientation;
+} touch_calibration_t;
+
+typedef struct __attribute__((__packed__)) {
+  uint16_t x, y;
+  int16_t raw_x, raw_y;
+} touch_calibration_point_t;
+
+enum calibrationState : uint8_t {
+  CALIBRATION_TOP_LEFT = 0x00,
+  CALIBRATION_BOTTOM_LEFT,
+  CALIBRATION_TOP_RIGHT,
+  CALIBRATION_BOTTOM_RIGHT,
+  CALIBRATION_SUCCESS,
+  CALIBRATION_FAIL,
+  CALIBRATION_NONE,
+};
+
+class TouchCalibration {
+public:
+  static calibrationState calibration_state;
+  static touch_calibration_point_t calibration_points[4];
+
+  static bool validate_precision(int32_t a, int32_t b) { return (a > b ? (100 * b) / a :  (100 * a) / b) > TOUCH_SCREEN_CALIBRATION_PRECISION; }
+  static bool validate_precision_x(uint8_t a, uint8_t b) { return validate_precision(calibration_points[a].raw_x, calibration_points[b].raw_x); }
+  static bool validate_precision_y(uint8_t a, uint8_t b) { return validate_precision(calibration_points[a].raw_y, calibration_points[b].raw_y); }
+  static void validate_calibration();
+
+  static touch_calibration_t calibration;
+  static uint8_t             failed_count;
+  static void calibration_reset() { calibration = { TOUCH_CALIBRATION_X, TOUCH_CALIBRATION_Y, TOUCH_OFFSET_X, TOUCH_OFFSET_Y, TOUCH_ORIENTATION }; }
+  static bool need_calibration() { return !calibration.offset_x && !calibration.offset_y && !calibration.x && !calibration.y; }
+
+  static calibrationState calibration_start() {
+    calibration = { 0, 0, 0, 0, TOUCH_ORIENTATION_NONE };
+    calibration_state = CALIBRATION_TOP_LEFT;
+    calibration_points[CALIBRATION_TOP_LEFT].x = 30;
+    calibration_points[CALIBRATION_TOP_LEFT].y = 30;
+    calibration_points[CALIBRATION_BOTTOM_LEFT].x = 30;
+    calibration_points[CALIBRATION_BOTTOM_LEFT].y = TFT_HEIGHT - 31;
+    calibration_points[CALIBRATION_TOP_RIGHT].x = TFT_WIDTH - 31;
+    calibration_points[CALIBRATION_TOP_RIGHT].y = 30;
+    calibration_points[CALIBRATION_BOTTOM_RIGHT].x = TFT_WIDTH - 31;
+    calibration_points[CALIBRATION_BOTTOM_RIGHT].y = TFT_HEIGHT - 31;
+    failed_count = 0;
+    return calibration_state;
+  }
+  static void calibration_end() { calibration_state = CALIBRATION_NONE; }
+  static calibrationState get_calibration_state() { return calibration_state; }
+  static bool calibration_loaded() {
+    if (need_calibration()) calibration_reset();
+    return !need_calibration();
+  }
+
+  static bool handleTouch(uint16_t x, uint16_t y);
+};
+
+extern TouchCalibration touch_calibration;