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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 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
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