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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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#include "MarlinConfig.h"
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#if ENABLED(DIGIPOT_I2C) && DISABLED(DIGIPOT_MCP4018)
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#include "Stream.h"
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#include "utility/twi.h"
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#include "Wire.h"
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// Settings for the I2C based DIGIPOT (MCP4451) on Azteeg X3 Pro
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#if MB(5DPRINT)
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#define DIGIPOT_I2C_FACTOR 117.96
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#define DIGIPOT_I2C_MAX_CURRENT 1.736
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#else
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#define DIGIPOT_I2C_FACTOR 106.7
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#define DIGIPOT_I2C_MAX_CURRENT 2.5
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#endif
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static byte current_to_wiper(const float current) {
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return byte(CEIL(float((DIGIPOT_I2C_FACTOR * current))));
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}
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static void i2c_send(const byte addr, const byte a, const byte b) {
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Wire.beginTransmission(addr);
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Wire.write(a);
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Wire.write(b);
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Wire.endTransmission();
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}
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// This is for the MCP4451 I2C based digipot
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void digipot_i2c_set_current(uint8_t channel, float current) {
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current = MIN((float) MAX(current, 0), DIGIPOT_I2C_MAX_CURRENT);
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// these addresses are specific to Azteeg X3 Pro, can be set to others,
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// In this case first digipot is at address A0=0, A1= 0, second one is at A0=0, A1= 1
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byte addr = 0x2C; // channel 0-3
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if (channel >= 4) {
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addr = 0x2E; // channel 4-7
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channel -= 4;
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}
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// Initial setup
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i2c_send(addr, 0x40, 0xFF);
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i2c_send(addr, 0xA0, 0xFF);
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// Set actual wiper value
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byte addresses[4] = { 0x00, 0x10, 0x60, 0x70 };
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i2c_send(addr, addresses[channel], current_to_wiper(current));
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}
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void digipot_i2c_init() {
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static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
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Wire.begin();
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// setup initial currents as defined in Configuration_adv.h
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for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
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digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
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}
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#endif // DIGIPOT_I2C
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