Initial commit

1 files changed, 154 insertions, 0 deletions

diff --git a/Marlin/src/feature/dac/dac_mcp4728.cpp b/Marlin/src/feature/dac/dac_mcp4728.cpp
new file mode 100644
index 0000000..4f33c4e
--- /dev/null
+++ b/Marlin/src/feature/dac/dac_mcp4728.cpp
@@ -0,0 +1,154 @@
+/**
+ * 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/>.
+ *
+ */
+
+/**
+ * mcp4728.cpp - Arduino library for MicroChip MCP4728 I2C D/A converter
+ *
+ * For implementation details, please take a look at the datasheet:
+ * https://ww1.microchip.com/downloads/en/DeviceDoc/22187a.pdf
+ *
+ * For discussion and feedback, please go to:
+ * https://forum.arduino.cc/index.php/topic,51842.0.html
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(HAS_MOTOR_CURRENT_DAC)
+
+#include "dac_mcp4728.h"
+
+MCP4728 mcp4728;
+
+xyze_uint_t dac_values;
+
+/**
+ * Begin I2C, get current values (input register and eeprom) of mcp4728
+ */
+void MCP4728::init() {
+  Wire.begin();
+  Wire.requestFrom(I2C_ADDRESS(DAC_DEV_ADDRESS), uint8_t(24));
+  while (Wire.available()) {
+    char deviceID = Wire.read(),
+         hiByte = Wire.read(),
+         loByte = Wire.read();
+
+    if (!(deviceID & 0x08))
+      dac_values[(deviceID & 0x30) >> 4] = word((hiByte & 0x0F), loByte);
+  }
+}
+
+/**
+ * Write input resister value to specified channel using fastwrite method.
+ * Channel : 0-3, Values : 0-4095
+ */
+uint8_t MCP4728::analogWrite(const uint8_t channel, const uint16_t value) {
+  dac_values[channel] = value;
+  return fastWrite();
+}
+
+/**
+ * Write all input resistor values to EEPROM using SequencialWrite method.
+ * This will update both input register and EEPROM value
+ * This will also write current Vref, PowerDown, Gain settings to EEPROM
+ */
+uint8_t MCP4728::eepromWrite() {
+  Wire.beginTransmission(I2C_ADDRESS(DAC_DEV_ADDRESS));
+  Wire.write(SEQWRITE);
+  LOOP_XYZE(i) {
+    Wire.write(DAC_STEPPER_VREF << 7 | DAC_STEPPER_GAIN << 4 | highByte(dac_values[i]));
+    Wire.write(lowByte(dac_values[i]));
+  }
+  return Wire.endTransmission();
+}
+
+/**
+ * Write Voltage reference setting to all input regiters
+ */
+uint8_t MCP4728::setVref_all(const uint8_t value) {
+  Wire.beginTransmission(I2C_ADDRESS(DAC_DEV_ADDRESS));
+  Wire.write(VREFWRITE | (value ? 0x0F : 0x00));
+  return Wire.endTransmission();
+}
+/**
+ * Write Gain setting to all input regiters
+ */
+uint8_t MCP4728::setGain_all(const uint8_t value) {
+  Wire.beginTransmission(I2C_ADDRESS(DAC_DEV_ADDRESS));
+  Wire.write(GAINWRITE | (value ? 0x0F : 0x00));
+  return Wire.endTransmission();
+}
+
+/**
+ * Return Input Register value
+ */
+uint16_t MCP4728::getValue(const uint8_t channel) { return dac_values[channel]; }
+
+#if 0
+/**
+ * Steph: Might be useful in the future
+ * Return Vout
+ */
+uint16_t MCP4728::getVout(const uint8_t channel) {
+  const uint32_t vref = 2048,
+                 vOut = (vref * dac_values[channel] * (_DAC_STEPPER_GAIN + 1)) / 4096;
+  return _MIN(vOut, defaultVDD);
+}
+#endif
+
+/**
+ * Returns DAC values as a 0-100 percentage of drive strength
+ */
+uint8_t MCP4728::getDrvPct(const uint8_t channel) { return uint8_t(100.0 * dac_values[channel] / (DAC_STEPPER_MAX) + 0.5); }
+
+/**
+ * Receives all Drive strengths as 0-100 percent values, updates
+ * DAC Values array and calls fastwrite to update the DAC.
+ */
+void MCP4728::setDrvPct(xyze_uint_t &pct) {
+  dac_values = pct * (DAC_STEPPER_MAX) * 0.01f;
+  fastWrite();
+}
+
+/**
+ * FastWrite input register values - All DAC ouput update. refer to DATASHEET 5.6.1
+ * DAC Input and PowerDown bits update.
+ * No EEPROM update
+ */
+uint8_t MCP4728::fastWrite() {
+  Wire.beginTransmission(I2C_ADDRESS(DAC_DEV_ADDRESS));
+  LOOP_XYZE(i) {
+    Wire.write(highByte(dac_values[i]));
+    Wire.write(lowByte(dac_values[i]));
+  }
+  return Wire.endTransmission();
+}
+
+/**
+ * Common function for simple general commands
+ */
+uint8_t MCP4728::simpleCommand(const byte simpleCommand) {
+  Wire.beginTransmission(I2C_ADDRESS(GENERALCALL));
+  Wire.write(simpleCommand);
+  return Wire.endTransmission();
+}
+
+#endif // HAS_MOTOR_CURRENT_DAC