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-rw-r--r--Marlin/src/feature/digipot/digipot_mcp4018.cpp104
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diff --git a/Marlin/src/feature/digipot/digipot_mcp4018.cpp b/Marlin/src/feature/digipot/digipot_mcp4018.cpp
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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
+
+#define DIGIPOT_A4988_Rsx 0.250
+#define DIGIPOT_A4988_Vrefmax 1.666
+#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