My Marlin configs for Fabrikator Mini and CTC i3 Pro B
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digipot_mcp4018.cpp 3.1KB

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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 "Stream.h"
  25. #include "utility/twi.h"
  26. #include <SlowSoftI2CMaster.h> //https://github.com/stawel/SlowSoftI2CMaster
  27. // Settings for the I2C based DIGIPOT (MCP4018) based on WT150
  28. #define DIGIPOT_I2C_ADDRESS 0x2F
  29. #define DIGIPOT_A4988_Rsx 0.250
  30. #define DIGIPOT_A4988_Vrefmax 5.0
  31. #define DIGIPOT_A4988_MAX_VALUE 127
  32. #define DIGIPOT_A4988_Itripmax(Vref) ((Vref)/(8.0*DIGIPOT_A4988_Rsx))
  33. #define DIGIPOT_A4988_FACTOR (DIGIPOT_A4988_MAX_VALUE/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
  34. //TODO: MAX_CURRENT -0.5A ?? (currently set to 2A, max possible current 2.5A)
  35. #define DIGIPOT_A4988_MAX_CURRENT (DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax) - 0.5)
  36. static byte current_to_wiper(float current) {
  37. return byte(ceil(float((DIGIPOT_A4988_FACTOR * current))));
  38. }
  39. static uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = {
  40. DIGIPOTS_I2C_SDA_X,
  41. DIGIPOTS_I2C_SDA_Y,
  42. DIGIPOTS_I2C_SDA_Z,
  43. DIGIPOTS_I2C_SDA_E0,
  44. DIGIPOTS_I2C_SDA_E1,
  45. };
  46. static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = {
  47. SlowSoftI2CMaster { sda_pins[0], DIGIPOTS_I2C_SCL },
  48. SlowSoftI2CMaster { sda_pins[1], DIGIPOTS_I2C_SCL },
  49. SlowSoftI2CMaster { sda_pins[2], DIGIPOTS_I2C_SCL },
  50. SlowSoftI2CMaster { sda_pins[3], DIGIPOTS_I2C_SCL },
  51. SlowSoftI2CMaster { sda_pins[4], DIGIPOTS_I2C_SCL }
  52. };
  53. static void i2c_send(int channel, byte v) {
  54. if (WITHIN(channel, 0, DIGIPOT_I2C_NUM_CHANNELS - 1)) {
  55. pots[channel].i2c_start(((DIGIPOT_I2C_ADDRESS) << 1) | I2C_WRITE);
  56. pots[channel].i2c_write(v);
  57. pots[channel].i2c_stop();
  58. }
  59. }
  60. // This is for the MCP4018 I2C based digipot
  61. void digipot_i2c_set_current(int channel, float current) {
  62. current = min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT));
  63. i2c_send(channel, current_to_wiper(current));
  64. }
  65. void digipot_i2c_init() {
  66. const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
  67. for (uint8_t i = 0; i < DIGIPOT_I2C_NUM_CHANNELS; i++)
  68. pots[i].i2c_init();
  69. // setup initial currents as defined in Configuration_adv.h
  70. for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
  71. digipot_i2c_set_current(i, digipot_motor_current[i]);
  72. }
  73. #endif // DIGIPOT_I2C && DIGIPOT_MCP4018