My Marlin configs for Fabrikator Mini and CTC i3 Pro B
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digipot_mcp4018.cpp 3.5KB

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  1. /**
  2. * Marlin 3D Printer Firmware
  3. * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  4. *
  5. * Based on Sprinter and grbl.
  6. * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
  7. *
  8. * This program is free software: you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License as published by
  10. * the Free Software Foundation, either version 3 of the License, or
  11. * (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program. If not, see <http://www.gnu.org/licenses/>.
  20. *
  21. */
  22. #include "MarlinConfig.h"
  23. #if ENABLED(DIGIPOT_I2C) && ENABLED(DIGIPOT_MCP4018)
  24. #include "enum.h"
  25. #include "Stream.h"
  26. #include "utility/twi.h"
  27. #include <SlowSoftI2CMaster.h> //https://github.com/stawel/SlowSoftI2CMaster
  28. // Settings for the I2C based DIGIPOT (MCP4018) based on WT150
  29. #define DIGIPOT_I2C_ADDRESS 0x2F
  30. #define DIGIPOT_A4988_Rsx 0.250
  31. #define DIGIPOT_A4988_Vrefmax 1.666
  32. #define DIGIPOT_A4988_MAX_VALUE 127
  33. #define DIGIPOT_A4988_Itripmax(Vref) ((Vref)/(8.0*DIGIPOT_A4988_Rsx))
  34. #define DIGIPOT_A4988_FACTOR ((DIGIPOT_A4988_MAX_VALUE)/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
  35. #define DIGIPOT_A4988_MAX_CURRENT 2.0
  36. static byte current_to_wiper(const float current) {
  37. const int16_t value = ceil(float(DIGIPOT_A4988_FACTOR) * current);
  38. return byte(constrain(value, 0, DIGIPOT_A4988_MAX_VALUE));
  39. }
  40. const uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = {
  41. DIGIPOTS_I2C_SDA_X
  42. #if DIGIPOT_I2C_NUM_CHANNELS > 1
  43. , DIGIPOTS_I2C_SDA_Y
  44. #if DIGIPOT_I2C_NUM_CHANNELS > 2
  45. , DIGIPOTS_I2C_SDA_Z
  46. #if DIGIPOT_I2C_NUM_CHANNELS > 3
  47. , DIGIPOTS_I2C_SDA_E0
  48. #if DIGIPOT_I2C_NUM_CHANNELS > 4
  49. , DIGIPOTS_I2C_SDA_E1
  50. #endif
  51. #endif
  52. #endif
  53. #endif
  54. };
  55. static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = {
  56. SlowSoftI2CMaster { sda_pins[X_AXIS], DIGIPOTS_I2C_SCL }
  57. #if DIGIPOT_I2C_NUM_CHANNELS > 1
  58. , SlowSoftI2CMaster { sda_pins[Y_AXIS], DIGIPOTS_I2C_SCL }
  59. #if DIGIPOT_I2C_NUM_CHANNELS > 2
  60. , SlowSoftI2CMaster { sda_pins[Z_AXIS], DIGIPOTS_I2C_SCL }
  61. #if DIGIPOT_I2C_NUM_CHANNELS > 3
  62. , SlowSoftI2CMaster { sda_pins[E_AXIS], DIGIPOTS_I2C_SCL }
  63. #if DIGIPOT_I2C_NUM_CHANNELS > 4
  64. , SlowSoftI2CMaster { sda_pins[E_AXIS + 1], DIGIPOTS_I2C_SCL }
  65. #endif
  66. #endif
  67. #endif
  68. #endif
  69. };
  70. static void i2c_send(const uint8_t channel, const byte v) {
  71. if (WITHIN(channel, 0, DIGIPOT_I2C_NUM_CHANNELS - 1)) {
  72. pots[channel].i2c_start(((DIGIPOT_I2C_ADDRESS) << 1) | I2C_WRITE);
  73. pots[channel].i2c_write(v);
  74. pots[channel].i2c_stop();
  75. }
  76. }
  77. // This is for the MCP4018 I2C based digipot
  78. void digipot_i2c_set_current(uint8_t channel, float current) {
  79. i2c_send(channel, current_to_wiper(min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT))));
  80. }
  81. void digipot_i2c_init() {
  82. static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
  83. for (uint8_t i = 0; i < DIGIPOT_I2C_NUM_CHANNELS; i++)
  84. pots[i].i2c_init();
  85. // setup initial currents as defined in Configuration_adv.h
  86. for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
  87. digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
  88. }
  89. #endif // DIGIPOT_I2C && DIGIPOT_MCP4018