104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
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*
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*/
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#include "../../inc/MarlinConfig.h"
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#if ENABLED(DIGIPOT_MCP4451)
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#include "digipot.h"
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#include <Stream.h>
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#include <Wire.h>
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#if MB(MKS_SBASE)
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#include "digipot_mcp4451_I2C_routines.h"
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#endif
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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 117.96f
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#define DIGIPOT_I2C_MAX_CURRENT 1.736f
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#elif MB(AZTEEG_X5_MINI, AZTEEG_X5_MINI_WIFI)
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#define DIGIPOT_I2C_FACTOR 113.5f
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#define DIGIPOT_I2C_MAX_CURRENT 2.0f
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#elif MB(AZTEEG_X5_GT)
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#define DIGIPOT_I2C_FACTOR 51.0f
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#define DIGIPOT_I2C_MAX_CURRENT 3.0f
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#else
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#define DIGIPOT_I2C_FACTOR 106.7f
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#define DIGIPOT_I2C_MAX_CURRENT 2.5f
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#endif
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static byte current_to_wiper(const float current) {
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return byte(TERN(DIGIPOT_USE_RAW_VALUES, current, CEIL(DIGIPOT_I2C_FACTOR * current)));
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}
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static void digipot_i2c_send(const byte addr, const byte a, const byte b) {
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#if MB(MKS_SBASE)
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digipot_mcp4451_start(addr);
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digipot_mcp4451_send_byte(a);
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digipot_mcp4451_send_byte(b);
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#else
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Wire.beginTransmission(I2C_ADDRESS(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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#endif
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}
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// This is for the MCP4451 I2C based digipot
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void DigipotI2C::set_current(const uint8_t channel, const float 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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const byte addr = channel < 4 ? DIGIPOT_I2C_ADDRESS_A : DIGIPOT_I2C_ADDRESS_B; // channel 0-3 vs 4-7
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// Initial setup
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digipot_i2c_send(addr, 0x40, 0xFF);
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digipot_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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digipot_i2c_send(addr, addresses[channel & 0x3], current_to_wiper(_MIN(float(_MAX(current, 0)), DIGIPOT_I2C_MAX_CURRENT)));
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}
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void DigipotI2C::init() {
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#if MB(MKS_SBASE)
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configure_i2c(16); // Set clock_option to 16 ensure I2C is initialized at 400kHz
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#else
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Wire.begin();
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#endif
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// Set up initial currents as defined in Configuration_adv.h
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static const float digipot_motor_current[] PROGMEM =
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#if ENABLED(DIGIPOT_USE_RAW_VALUES)
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DIGIPOT_MOTOR_CURRENT
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#else
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DIGIPOT_I2C_MOTOR_CURRENTS
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#endif
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;
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LOOP_L_N(i, COUNT(digipot_motor_current))
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set_current(i, pgm_read_float(&digipot_motor_current[i]));
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}
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DigipotI2C digipot_i2c;
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#endif // DIGIPOT_MCP4451
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