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102 lines
3.6 KiB
102 lines
3.6 KiB
/**
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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_MCP4018)
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#include "digipot.h"
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#include <Stream.h>
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#include <SlowSoftI2CMaster.h> // https://github.com/stawel/SlowSoftI2CMaster
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// Settings for the I2C based DIGIPOT (MCP4018) based on WT150
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#define DIGIPOT_A4988_Rsx 0.250
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#define DIGIPOT_A4988_Vrefmax 1.666
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#define DIGIPOT_MCP4018_MAX_VALUE 127
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#define DIGIPOT_A4988_Itripmax(Vref) ((Vref) / (8.0 * DIGIPOT_A4988_Rsx))
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#define DIGIPOT_A4988_FACTOR ((DIGIPOT_MCP4018_MAX_VALUE) / DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
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#define DIGIPOT_A4988_MAX_CURRENT 2.0
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static byte current_to_wiper(const float current) {
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const int16_t value = TERN(DIGIPOT_USE_RAW_VALUES, current, CEIL(current * DIGIPOT_A4988_FACTOR));
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return byte(constrain(value, 0, DIGIPOT_MCP4018_MAX_VALUE));
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}
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static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = {
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SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_X, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 1
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_Y, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 2
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_Z, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 3
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E0, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 4
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E1, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 5
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E2, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 6
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E3, DIGIPOTS_I2C_SCL)
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#if DIGIPOT_I2C_NUM_CHANNELS > 7
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, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E4, DIGIPOTS_I2C_SCL)
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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#endif
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};
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static void digipot_i2c_send(const uint8_t channel, const byte v) {
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if (WITHIN(channel, 0, DIGIPOT_I2C_NUM_CHANNELS - 1)) {
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pots[channel].i2c_start(((DIGIPOT_I2C_ADDRESS_A) << 1) | I2C_WRITE);
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pots[channel].i2c_write(v);
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pots[channel].i2c_stop();
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}
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}
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// This is for the MCP4018 I2C based digipot
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void DigipotI2C::set_current(const uint8_t channel, const float current) {
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const float ival = _MIN(_MAX(current, 0), float(DIGIPOT_MCP4018_MAX_VALUE));
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digipot_i2c_send(channel, current_to_wiper(ival));
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}
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void DigipotI2C::init() {
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LOOP_L_N(i, DIGIPOT_I2C_NUM_CHANNELS) pots[i].i2c_init();
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// Init currents according to 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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#endif // DIGIPOT_MCP4018
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