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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_MCP4451)
-
- #include "digipot.h"
-
- #include <Stream.h>
- #include <Wire.h>
-
- #if MB(MKS_SBASE)
- #include "digipot_mcp4451_I2C_routines.h"
- #endif
-
- // Settings for the I2C based DIGIPOT (MCP4451) on Azteeg X3 Pro
- #if MB(5DPRINT)
- #define DIGIPOT_I2C_FACTOR 117.96f
- #define DIGIPOT_I2C_MAX_CURRENT 1.736f
- #elif MB(AZTEEG_X5_MINI, AZTEEG_X5_MINI_WIFI)
- #define DIGIPOT_I2C_FACTOR 113.5f
- #define DIGIPOT_I2C_MAX_CURRENT 2.0f
- #elif MB(AZTEEG_X5_GT)
- #define DIGIPOT_I2C_FACTOR 51.0f
- #define DIGIPOT_I2C_MAX_CURRENT 3.0f
- #else
- #define DIGIPOT_I2C_FACTOR 106.7f
- #define DIGIPOT_I2C_MAX_CURRENT 2.5f
- #endif
-
- static byte current_to_wiper(const float current) {
- return byte(TERN(DIGIPOT_USE_RAW_VALUES, current, CEIL(DIGIPOT_I2C_FACTOR * current)));
- }
-
- static void digipot_i2c_send(const byte addr, const byte a, const byte b) {
- #if MB(MKS_SBASE)
- digipot_mcp4451_start(addr);
- digipot_mcp4451_send_byte(a);
- digipot_mcp4451_send_byte(b);
- #else
- Wire.beginTransmission(I2C_ADDRESS(addr));
- Wire.write(a);
- Wire.write(b);
- Wire.endTransmission();
- #endif
- }
-
- // This is for the MCP4451 I2C based digipot
- void DigipotI2C::set_current(const uint8_t channel, const float current) {
- // These addresses are specific to Azteeg X3 Pro, can be set to others.
- // In this case first digipot is at address A0=0, A1=0, second one is at A0=0, A1=1
- const byte addr = channel < 4 ? DIGIPOT_I2C_ADDRESS_A : DIGIPOT_I2C_ADDRESS_B; // channel 0-3 vs 4-7
-
- // Initial setup
- digipot_i2c_send(addr, 0x40, 0xFF);
- digipot_i2c_send(addr, 0xA0, 0xFF);
-
- // Set actual wiper value
- byte addresses[4] = { 0x00, 0x10, 0x60, 0x70 };
- digipot_i2c_send(addr, addresses[channel & 0x3], current_to_wiper(_MIN(float(_MAX(current, 0)), DIGIPOT_I2C_MAX_CURRENT)));
- }
-
- void DigipotI2C::init() {
- #if MB(MKS_SBASE)
- configure_i2c(16); // Set clock_option to 16 ensure I2C is initialized at 400kHz
- #else
- Wire.begin();
- #endif
- // Set up initial currents as defined in 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_MCP4451
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