1 files changed, 118 insertions, 0 deletions
diff --git a/Marlin/src/lcd/extui/lib/dgus/DGUSDisplay.h b/Marlin/src/lcd/extui/lib/dgus/DGUSDisplay.h
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+++ b/Marlin/src/lcd/extui/lib/dgus/DGUSDisplay.h
@@ -0,0 +1,118 @@
+/**
+ * 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/>.
+ *
+ */
+#pragma once
+
+/* DGUS implementation written by coldtobi in 2019 for Marlin */
+
+#include "../../../../inc/MarlinConfigPre.h"
+
+#include <stdlib.h>    // size_t
+
+#if HAS_BED_PROBE
+  #include "../../../../module/probe.h"
+#endif
+#include "DGUSVPVariable.h"
+
+enum DGUSLCD_Screens : uint8_t;
+
+#define DEBUG_OUT ENABLED(DEBUG_DGUSLCD)
+#include "../../../../core/debug_out.h"
+
+typedef enum : uint8_t {
+  DGUS_IDLE,           //< waiting for DGUS_HEADER1.
+  DGUS_HEADER1_SEEN,   //< DGUS_HEADER1 received
+  DGUS_HEADER2_SEEN,   //< DGUS_HEADER2 received
+  DGUS_WAIT_TELEGRAM,  //< LEN received, Waiting for to receive all bytes.
+} rx_datagram_state_t;
+
+// Low-Level access to the display.
+class DGUSDisplay {
+public:
+
+  DGUSDisplay() = default;
+
+  static void InitDisplay();
+
+  // Variable access.
+  static void WriteVariable(uint16_t adr, const void* values, uint8_t valueslen, bool isstr=false);
+  static void WriteVariablePGM(uint16_t adr, const void* values, uint8_t valueslen, bool isstr=false);
+  static void WriteVariable(uint16_t adr, int16_t value);
+  static void WriteVariable(uint16_t adr, uint16_t value);
+  static void WriteVariable(uint16_t adr, uint8_t value);
+  static void WriteVariable(uint16_t adr, int8_t value);
+  static void WriteVariable(uint16_t adr, long value);
+
+  // Utility functions for bridging ui_api and dbus
+  template<typename T, float(*Getter)(const T), T selector, typename WireType=uint16_t>
+  static void SetVariable(DGUS_VP_Variable &var) {
+    WriteVariable(var.VP, (WireType)Getter(selector));
+  }
+
+  template<typename T, void(*Setter)(const float V, const T), T selector>
+  static void GetVariable(DGUS_VP_Variable &var, void *val_ptr) {
+    uint16_t newvalue = swap16(*(uint16_t*)val_ptr);
+    Setter(newvalue, selector);
+  }
+
+  // Until now I did not need to actively read from the display. That's why there is no ReadVariable
+  // (I extensively use the auto upload of the display)
+
+  // Force display into another screen.
+  // (And trigger update of containing VPs)
+  // (to implement a pop up message, which may not be nested)
+  static void RequestScreen(DGUSLCD_Screens screen);
+
+  // Periodic tasks, eg. Rx-Queue handling.
+  static void loop();
+
+public:
+  // Helper for users of this class to estimate if an interaction would be blocking.
+  static size_t GetFreeTxBuffer();
+
+  // Checks two things: Can we confirm the presence of the display and has we initiliazed it.
+  // (both boils down that the display answered to our chatting)
+  static inline bool isInitialized() { return Initialized; }
+
+private:
+  static void WriteHeader(uint16_t adr, uint8_t cmd, uint8_t payloadlen);
+  static void WritePGM(const char str[], uint8_t len);
+  static void ProcessRx();
+
+  static inline uint16_t swap16(const uint16_t value) { return (value & 0xFFU) << 8U | (value >> 8U); }
+  static rx_datagram_state_t rx_datagram_state;
+  static uint8_t rx_datagram_len;
+  static bool Initialized, no_reentrance;
+};
+
+#define GET_VARIABLE(f, t, V...) (&DGUSDisplay::GetVariable<decltype(t), f, t, ##V>)
+#define SET_VARIABLE(f, t, V...) (&DGUSDisplay::SetVariable<decltype(t), f, t, ##V>)
+
+extern DGUSDisplay dgusdisplay;
+
+// compile-time x^y
+constexpr float cpow(const float x, const int y) { return y == 0 ? 1.0 : x * cpow(x, y - 1); }
+
+/// Find the flash address of a DGUS_VP_Variable for the VP.
+extern const DGUS_VP_Variable* DGUSLCD_FindVPVar(const uint16_t vp);
+
+/// Helper to populate a DGUS_VP_Variable for a given VP. Return false if not found.
+extern bool populate_VPVar(const uint16_t VP, DGUS_VP_Variable * const ramcopy);