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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
#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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