From 85f0556118a71208fc0f2290ac60dc3657c8638c Mon Sep 17 00:00:00 2001
From: Tanguy Pruvot <tpruvot@users.noreply.github.com>
Date: Thu, 5 Sep 2019 00:32:20 +0200
Subject: [PATCH] Add XPT2046 calibration functions (#15140)

---
 Marlin/src/feature/touch/xpt2046.cpp | 8 ++++++++
 Marlin/src/feature/touch/xpt2046.h   | 5 ++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Marlin/src/feature/touch/xpt2046.cpp b/Marlin/src/feature/touch/xpt2046.cpp
index 3acfc0199e..cf1afc554c 100644
--- a/Marlin/src/feature/touch/xpt2046.cpp
+++ b/Marlin/src/feature/touch/xpt2046.cpp
@@ -135,4 +135,12 @@ uint16_t XPT2046::getInTouch(const XPTCoordinate coordinate) {
   return (data[1] + data[2]) >> 1;
 }
 
+bool XPT2046::getTouchPoint(uint16_t &x, uint16_t &y) {
+  if (isTouched()) {
+    x = getInTouch(XPT2046_X);
+    y = getInTouch(XPT2046_Y);
+  }
+  return isTouched();
+}
+
 #endif // TOUCH_BUTTONS
diff --git a/Marlin/src/feature/touch/xpt2046.h b/Marlin/src/feature/touch/xpt2046.h
index aea840576c..c4ac9d9662 100644
--- a/Marlin/src/feature/touch/xpt2046.h
+++ b/Marlin/src/feature/touch/xpt2046.h
@@ -42,8 +42,11 @@ class XPT2046 {
 public:
   static void init(void);
   static uint8_t read_buttons();
-private:
+  bool getTouchPoint(uint16_t &x, uint16_t &y);
   static bool isTouched();
+  inline void waitForRelease(void) { while (isTouched()) { /* nada */ } }
+  inline void waitForTouch(uint16_t &x, uint16_t &y) { while (!getTouchPoint(x, y)) { /* nada */ } }
+private:
   static uint16_t getInTouch(const XPTCoordinate coordinate);
 };