1 files changed, 82 insertions, 0 deletions
diff --git a/Marlin/src/feature/dac/dac_mcp4728.h b/Marlin/src/feature/dac/dac_mcp4728.h
new file mode 100644
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+++ b/Marlin/src/feature/dac/dac_mcp4728.h
@@ -0,0 +1,82 @@
+/**
+ * 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
+
+/**
+ * Arduino library for MicroChip MCP4728 I2C D/A converter.
+ */
+
+#include "../../core/types.h"
+
+#include <Wire.h>
+
+/**
+ * The following three macros are only used in this piece of code related to mcp4728.
+ * They are defined in the standard Arduino framework but could be undefined in 32 bits Arduino frameworks.
+ * (For instance not defined in Arduino lpc176x framework)
+ * So we have to define them if needed.
+ */
+#ifndef word
+  #define word(h, l)  ((uint8_t) ((h << 8) | l))
+#endif
+
+#ifndef lowByte
+  #define lowByte(w)  ((uint8_t) ((w) & 0xFF))
+#endif
+
+#ifndef highByte
+  #define highByte(w) ((uint8_t) ((w) >> 8))
+#endif
+
+#define defaultVDD     DAC_STEPPER_MAX //was 5000 but differs with internal Vref
+#define BASE_ADDR      0x60
+#define RESET          0b00000110
+#define WAKE           0b00001001
+#define UPDATE         0b00001000
+#define MULTIWRITE     0b01000000
+#define SINGLEWRITE    0b01011000
+#define SEQWRITE       0b01010000
+#define VREFWRITE      0b10000000
+#define GAINWRITE      0b11000000
+#define POWERDOWNWRITE 0b10100000
+#define GENERALCALL    0b00000000
+#define GAINWRITE      0b11000000
+
+// This is taken from the original lib, makes it easy to edit if needed
+// DAC_OR_ADDRESS defined in pins_BOARD.h  file
+#define DAC_DEV_ADDRESS (BASE_ADDR | DAC_OR_ADDRESS)
+
+class MCP4728 {
+public:
+  static void     init();
+  static uint8_t  analogWrite(const uint8_t channel, const uint16_t value);
+  static uint8_t  eepromWrite();
+  static uint8_t  setVref_all(const uint8_t value);
+  static uint8_t  setGain_all(const uint8_t value);
+  static uint16_t getValue(const uint8_t channel);
+  static uint8_t  fastWrite();
+  static uint8_t  simpleCommand(const byte simpleCommand);
+  static uint8_t  getDrvPct(const uint8_t channel);
+  static void     setDrvPct(xyze_uint_t &pct);
+};
+
+extern MCP4728 mcp4728;