diff options
Diffstat (limited to 'Marlin/src/feature/digipot/digipot_mcp4018.cpp')
-rw-r--r-- | Marlin/src/feature/digipot/digipot_mcp4018.cpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/Marlin/src/feature/digipot/digipot_mcp4018.cpp b/Marlin/src/feature/digipot/digipot_mcp4018.cpp new file mode 100644 index 0000000..37853ff --- /dev/null +++ b/Marlin/src/feature/digipot/digipot_mcp4018.cpp @@ -0,0 +1,104 @@ +/** + * 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 |