From e8701195e66f2d27ffe17fb514eae8173795aaf7 Mon Sep 17 00:00:00 2001
From: Georgiy Bondarenko <69736697+nehilo@users.noreply.github.com>
Date: Thu, 4 Mar 2021 22:54:23 +0500
Subject: Initial commit

---
 Marlin/src/HAL/STM32F1/tft/xpt2046.cpp | 144 +++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 Marlin/src/HAL/STM32F1/tft/xpt2046.cpp

(limited to 'Marlin/src/HAL/STM32F1/tft/xpt2046.cpp')

diff --git a/Marlin/src/HAL/STM32F1/tft/xpt2046.cpp b/Marlin/src/HAL/STM32F1/tft/xpt2046.cpp
new file mode 100644
index 0000000..98371c5
--- /dev/null
+++ b/Marlin/src/HAL/STM32F1/tft/xpt2046.cpp
@@ -0,0 +1,144 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if HAS_TFT_XPT2046 || HAS_TOUCH_BUTTONS
+
+#include "xpt2046.h"
+#include <SPI.h>
+
+uint16_t delta(uint16_t a, uint16_t b) { return a > b ? a - b : b - a; }
+
+#if ENABLED(TOUCH_BUTTONS_HW_SPI)
+  #include <SPI.h>
+
+  SPIClass XPT2046::SPIx(TOUCH_BUTTONS_HW_SPI_DEVICE);
+
+  static void touch_spi_init(uint8_t spiRate) {
+    /**
+     * STM32F1 APB2 = 72MHz, APB1 = 36MHz, max SPI speed of this MCU if 18Mhz
+     * STM32F1 has 3 SPI ports, SPI1 in APB2, SPI2/SPI3 in APB1
+     * so the minimum prescale of SPI1 is DIV4, SPI2/SPI3 is DIV2
+     */
+    uint8_t clock;
+    switch (spiRate) {
+      case SPI_FULL_SPEED:    clock = SPI_CLOCK_DIV4;  break;
+      case SPI_HALF_SPEED:    clock = SPI_CLOCK_DIV4; break;
+      case SPI_QUARTER_SPEED: clock = SPI_CLOCK_DIV8; break;
+      case SPI_EIGHTH_SPEED:  clock = SPI_CLOCK_DIV16; break;
+      case SPI_SPEED_5:       clock = SPI_CLOCK_DIV32; break;
+      case SPI_SPEED_6:       clock = SPI_CLOCK_DIV64; break;
+      default:                clock = SPI_CLOCK_DIV2;        // Default from the SPI library
+    }
+    XPT2046::SPIx.setModule(TOUCH_BUTTONS_HW_SPI_DEVICE);
+    XPT2046::SPIx.setClockDivider(clock);
+    XPT2046::SPIx.setBitOrder(MSBFIRST);
+    XPT2046::SPIx.setDataMode(SPI_MODE0);
+  }
+#endif // TOUCH_BUTTONS_HW_SPI
+
+void XPT2046::Init() {
+  SET_INPUT(TOUCH_MISO_PIN);
+  SET_OUTPUT(TOUCH_MOSI_PIN);
+  SET_OUTPUT(TOUCH_SCK_PIN);
+  OUT_WRITE(TOUCH_CS_PIN, HIGH);
+
+  #if PIN_EXISTS(TOUCH_INT)
+    // Optional Pendrive interrupt pin
+    SET_INPUT(TOUCH_INT_PIN);
+  #endif
+
+  TERN_(TOUCH_BUTTONS_HW_SPI, touch_spi_init(SPI_SPEED_6));
+
+  // Read once to enable pendrive status pin
+  getRawData(XPT2046_X);
+}
+
+bool XPT2046::isTouched() {
+  return isBusy() ? false : (
+    #if PIN_EXISTS(TOUCH_INT)
+      READ(TOUCH_INT_PIN) != HIGH
+    #else
+      getRawData(XPT2046_Z1) >= XPT2046_Z1_THRESHOLD
+    #endif
+  );
+}
+
+bool XPT2046::getRawPoint(int16_t *x, int16_t *y) {
+  if (isBusy()) return false;
+  if (!isTouched()) return false;
+  *x = getRawData(XPT2046_X);
+  *y = getRawData(XPT2046_Y);
+  return isTouched();
+}
+
+uint16_t XPT2046::getRawData(const XPTCoordinate coordinate) {
+  uint16_t data[3];
+
+  DataTransferBegin();
+  TERN_(TOUCH_BUTTONS_HW_SPI, SPIx.begin());
+
+  for (uint16_t i = 0; i < 3 ; i++) {
+    IO(coordinate);
+    data[i] = (IO() << 4) | (IO() >> 4);
+  }
+
+  TERN_(TOUCH_BUTTONS_HW_SPI, SPIx.end());
+  DataTransferEnd();
+
+  uint16_t delta01 = delta(data[0], data[1]),
+           delta02 = delta(data[0], data[2]),
+           delta12 = delta(data[1], data[2]);
+
+  if (delta01 > delta02 || delta01 > delta12)
+    data[delta02 > delta12 ? 0 : 1] = data[2];
+
+  return (data[0] + data[1]) >> 1;
+}
+
+uint16_t XPT2046::IO(uint16_t data) {
+  return TERN(TOUCH_BUTTONS_HW_SPI, HardwareIO, SoftwareIO)(data);
+}
+
+#if ENABLED(TOUCH_BUTTONS_HW_SPI)
+  uint16_t XPT2046::HardwareIO(uint16_t data) {
+    uint16_t result = SPIx.transfer(data);
+    return result;
+  }
+#endif
+
+uint16_t XPT2046::SoftwareIO(uint16_t data) {
+  uint16_t result = 0;
+
+  for (uint8_t j = 0x80; j; j >>= 1) {
+    WRITE(TOUCH_SCK_PIN, LOW);
+    WRITE(TOUCH_MOSI_PIN, data & j ? HIGH : LOW);
+    if (READ(TOUCH_MISO_PIN)) result |= j;
+    WRITE(TOUCH_SCK_PIN, HIGH);
+  }
+  WRITE(TOUCH_SCK_PIN, LOW);
+
+  return result;
+}
+
+#endif // HAS_TFT_XPT2046
-- 
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