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- /**
- * 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 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 SequentialWrite 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_LOGICAL_AXES(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 registers
- */
- 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 registers
- */
- 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 output 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_LOGICAL_AXES(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
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