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92 lines
3.1 KiB
92 lines
3.1 KiB
8 years ago
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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) && ENABLED(DIGIPOT_MCP4018)
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#include "Stream.h"
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#include "utility/twi.h"
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#include <SlowSoftI2CMaster.h> //https://github.com/felias-fogg/SlowSoftI2CMaster
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// Settings for the I2C based DIGIPOT (MCP4018) based on WT150
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#define DIGIPOT_I2C_ADDRESS 0x2f
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#define DIGIPOT_A4988_Rsx 0.250
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#define DIGIPOT_A4988_Vrefmax 5.0
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#define DIGIPOT_A4988_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_A4988_MAX_VALUE/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
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//TODO: MAX_CURRENT -0.5A ?? (currently set to 2A, max possible current 2.5A)
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#define DIGIPOT_A4988_MAX_CURRENT (DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax) - 0.5)
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static byte current_to_wiper(float current) {
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return byte(ceil(float((DIGIPOT_A4988_FACTOR * current))));
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}
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static uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = {
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DIGIPOTS_I2C_SDA_X,
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DIGIPOTS_I2C_SDA_Y,
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DIGIPOTS_I2C_SDA_Z,
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DIGIPOTS_I2C_SDA_E0,
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DIGIPOTS_I2C_SDA_E1,
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};
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static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = {
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SlowSoftI2CMaster { sda_pins[0], DIGIPOTS_I2C_SCL },
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SlowSoftI2CMaster { sda_pins[1], DIGIPOTS_I2C_SCL },
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SlowSoftI2CMaster { sda_pins[2], DIGIPOTS_I2C_SCL },
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SlowSoftI2CMaster { sda_pins[3], DIGIPOTS_I2C_SCL },
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SlowSoftI2CMaster { sda_pins[4], DIGIPOTS_I2C_SCL }
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};
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static void i2c_send(int channel, 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) << 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 digipot_i2c_set_current(int channel, float current) {
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current = min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT));
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i2c_send(channel, current_to_wiper(current));
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}
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void digipot_i2c_init() {
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const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
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for (uint8_t i = 0; i < DIGIPOT_I2C_NUM_CHANNELS; i++)
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pots[i].i2c_init();
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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, digipot_motor_current[i]);
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}
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#endif // DIGIPOT_I2C && DIGIPOT_MCP4018
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