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@ -1,22 +1,44 @@ |
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/*
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mcp4728.cpp - Arduino library for MicroChip MCP4728 I2C D/A converter |
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For implementation details, please take a look at the datasheet http://ww1.microchip.com/downloads/en/DeviceDoc/22187a.pdf
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For discussion and feedback, please go to http://arduino.cc/forum/index.php/topic,51842.0.html
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*/ |
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/**
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* Marlin 3D Printer Firmware |
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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* |
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* Based on Sprinter and grbl. |
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* |
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*/ |
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/**
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* mcp4728.cpp - Arduino library for MicroChip MCP4728 I2C D/A converter |
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* |
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* For implementation details, please take a look at the datasheet: |
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* http://ww1.microchip.com/downloads/en/DeviceDoc/22187a.pdf
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* |
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* For discussion and feedback, please go to: |
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* http://arduino.cc/forum/index.php/topic,51842.0.html
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*/ |
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/* _____PROJECT INCLUDES_____________________________________________________ */ |
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#include "dac_mcp4728.h" |
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#if ENABLED(DAC_STEPPER_CURRENT) |
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// Used Global variables
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uint16_t mcp4728_values[4]; |
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/*
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Begin I2C, get current values (input register and eeprom) of mcp4728 |
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*/ |
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/**
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* Begin I2C, get current values (input register and eeprom) of mcp4728 |
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*/ |
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void mcp4728_init() { |
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Wire.begin(); |
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Wire.requestFrom(int(DAC_DEV_ADDRESS), 24); |
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@ -33,19 +55,19 @@ void mcp4728_init() { |
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} |
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} |
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/*
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Write input resister value to specified channel using fastwrite method. |
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Channel : 0-3, Values : 0-4095 |
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*/ |
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/**
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* Write input resister value to specified channel using fastwrite method. |
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* Channel : 0-3, Values : 0-4095 |
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*/ |
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uint8_t mcp4728_analogWrite(uint8_t channel, uint16_t value) { |
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mcp4728_values[channel] = value; |
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return mcp4728_fastWrite(); |
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} |
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/*
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Write all input resistor values to EEPROM using SequencialWrite method. |
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This will update both input register and EEPROM value |
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This will also write current Vref, PowerDown, Gain settings to EEPROM |
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*/ |
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/**
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* Write all input resistor values to EEPROM using SequencialWrite method. |
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* This will update both input register and EEPROM value |
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* This will also write current Vref, PowerDown, Gain settings to EEPROM |
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*/ |
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uint8_t mcp4728_eepromWrite() { |
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Wire.beginTransmission(DAC_DEV_ADDRESS); |
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Wire.send(SEQWRITE); |
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@ -56,31 +78,32 @@ uint8_t mcp4728_eepromWrite() { |
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return Wire.endTransmission(); |
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} |
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/*
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Write Voltage reference setting to all input regiters |
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*/ |
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/**
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* Write Voltage reference setting to all input regiters |
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*/ |
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uint8_t mcp4728_setVref_all(uint8_t value) { |
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Wire.beginTransmission(DAC_DEV_ADDRESS); |
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Wire.send(VREFWRITE | value << 3 | value << 2 | value << 1 | value); |
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return Wire.endTransmission(); |
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} |
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/*
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Write Gain setting to all input regiters |
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*/ |
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/**
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* Write Gain setting to all input regiters |
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*/ |
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uint8_t mcp4728_setGain_all(uint8_t value) { |
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Wire.beginTransmission(DAC_DEV_ADDRESS); |
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Wire.send(GAINWRITE | value << 3 | value << 2 | value << 1 | value); |
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return Wire.endTransmission(); |
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} |
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/*
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Return Input Regiter value |
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*/ |
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/**
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* Return Input Regiter value |
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*/ |
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uint16_t mcp4728_getValue(uint8_t channel) { return mcp4728_values[channel]; } |
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/*
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// Steph: Might be useful in the future
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// Return Vout
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/**
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* Steph: Might be useful in the future |
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* Return Vout |
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* |
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uint16_t mcp4728_getVout(uint8_t channel) { |
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uint32_t vref = 2048; |
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uint32_t vOut = (vref * mcp4728_values[channel] * (_DAC_STEPPER_GAIN + 1)) / 4096; |
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@ -89,11 +112,11 @@ uint16_t mcp4728_getVout(uint8_t channel) { |
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} |
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*/ |
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/*
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FastWrite input register values - All DAC ouput update. refer to DATASHEET 5.6.1 |
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DAC Input and PowerDown bits update. |
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No EEPROM update |
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*/ |
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/**
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* FastWrite input register values - All DAC ouput update. refer to DATASHEET 5.6.1 |
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* DAC Input and PowerDown bits update. |
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* No EEPROM update |
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*/ |
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uint8_t mcp4728_fastWrite() { |
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Wire.beginTransmission(DAC_DEV_ADDRESS); |
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for (uint8_t channel=0; channel <= 3; channel++) { |
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@ -103,9 +126,9 @@ uint8_t mcp4728_fastWrite() { |
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return Wire.endTransmission(); |
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} |
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/*
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Common function for simple general commands |
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*/ |
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/**
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* Common function for simple general commands |
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*/ |
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uint8_t mcp4728_simpleCommand(byte simpleCommand) { |
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Wire.beginTransmission(GENERALCALL); |
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Wire.send(simpleCommand); |
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Scott Lahteine
9 years ago