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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- */
-
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(DIGIPOT_MCP4018)
-
- #include "digipot.h"
-
- #include <Stream.h>
- #include <SlowSoftI2CMaster.h> // https://github.com/felias-fogg/SlowSoftI2CMaster
-
- // Settings for the I2C based DIGIPOT (MCP4018) based on WT150
-
- #ifndef DIGIPOT_A4988_Rsx
- #define DIGIPOT_A4988_Rsx 0.250
- #endif
- #ifndef DIGIPOT_A4988_Vrefmax
- #define DIGIPOT_A4988_Vrefmax 1.666
- #endif
- #define DIGIPOT_MCP4018_MAX_VALUE 127
-
- #define DIGIPOT_A4988_Itripmax(Vref) ((Vref) / (8.0 * DIGIPOT_A4988_Rsx))
-
- #define DIGIPOT_A4988_FACTOR ((DIGIPOT_MCP4018_MAX_VALUE) / DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
- #define DIGIPOT_A4988_MAX_CURRENT 2.0
-
- static byte current_to_wiper(const float current) {
- const int16_t value = TERN(DIGIPOT_USE_RAW_VALUES, current, CEIL(current * DIGIPOT_A4988_FACTOR));
- return byte(constrain(value, 0, DIGIPOT_MCP4018_MAX_VALUE));
- }
-
- static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = {
- SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_X, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 1
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_Y, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 2
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_Z, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 3
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E0, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 4
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E1, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 5
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E2, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 6
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E3, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #if DIGIPOT_I2C_NUM_CHANNELS > 7
- , SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E4, DIGIPOTS_I2C_SCL, ENABLED(DIGIPOT_ENABLE_I2C_PULLUPS))
- #endif
- #endif
- #endif
- #endif
- #endif
- #endif
- #endif
- };
-
- static void digipot_i2c_send(const uint8_t channel, const byte v) {
- if (WITHIN(channel, 0, DIGIPOT_I2C_NUM_CHANNELS - 1)) {
- pots[channel].i2c_start(((DIGIPOT_I2C_ADDRESS_A) << 1) | I2C_WRITE);
- pots[channel].i2c_write(v);
- pots[channel].i2c_stop();
- }
- }
-
- // This is for the MCP4018 I2C based digipot
- void DigipotI2C::set_current(const uint8_t channel, const float current) {
- const float ival = _MIN(_MAX(current, 0), float(DIGIPOT_MCP4018_MAX_VALUE));
- digipot_i2c_send(channel, current_to_wiper(ival));
- }
-
- void DigipotI2C::init() {
- LOOP_L_N(i, DIGIPOT_I2C_NUM_CHANNELS) pots[i].i2c_init();
-
- // Init currents according to Configuration_adv.h
- static const float digipot_motor_current[] PROGMEM =
- #if ENABLED(DIGIPOT_USE_RAW_VALUES)
- DIGIPOT_MOTOR_CURRENT
- #else
- DIGIPOT_I2C_MOTOR_CURRENTS
- #endif
- ;
- LOOP_L_N(i, COUNT(digipot_motor_current))
- set_current(i, pgm_read_float(&digipot_motor_current[i]));
- }
-
- DigipotI2C digipot_i2c;
-
- #endif // DIGIPOT_MCP4018
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