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Option to use raw digipot values (#17536)

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This commit is contained in:
grauerfuchs
2020-04-18 23:56:23 -04:00
committed by GitHub
parent 8e8ba46cb6
commit 4a5a3d27ed
13 changed files with 89 additions and 84 deletions
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68
Marlin/src/feature/digipot/digipot_mcp4018.cpp
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@@ -22,53 +22,46 @@
#include "../../inc/MarlinConfig.h"
#if BOTH(DIGIPOT_I2C, DIGIPOT_MCP4018)
#if ENABLED(DIGIPOT_MCP4018)
#include <Stream.h>
#include <SlowSoftI2CMaster.h> //https://github.com/stawel/SlowSoftI2CMaster
#include <SlowSoftI2CMaster.h> // https://github.com/stawel/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_A4988_MAX_VALUE 127
#define DIGIPOT_MCP4018_MAX_VALUE 127
#define DIGIPOT_A4988_Itripmax(Vref) ((Vref)/(8.0*DIGIPOT_A4988_Rsx))
#define DIGIPOT_A4988_Itripmax(Vref) ((Vref) / (8.0 * DIGIPOT_A4988_Rsx))
#define DIGIPOT_A4988_FACTOR ((DIGIPOT_A4988_MAX_VALUE)/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
#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 = ceil(float(DIGIPOT_A4988_FACTOR) * current);
return byte(constrain(value, 0, DIGIPOT_A4988_MAX_VALUE));
const int16_t value = TERN(DIGIPOT_USE_RAW_VALUES, current, CEIL(current * DIGIPOT_A4988_FACTOR));
return byte(constrain(value, 0, DIGIPOT_MCP4018_MAX_VALUE));
}
const uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = {
DIGIPOTS_I2C_SDA_X
#if DIGIPOT_I2C_NUM_CHANNELS > 1
, DIGIPOTS_I2C_SDA_Y
#if DIGIPOT_I2C_NUM_CHANNELS > 2
, DIGIPOTS_I2C_SDA_Z
#if DIGIPOT_I2C_NUM_CHANNELS > 3
, DIGIPOTS_I2C_SDA_E0
#if DIGIPOT_I2C_NUM_CHANNELS > 4
, DIGIPOTS_I2C_SDA_E1
#endif
#endif
#endif
#endif
};
static SlowSoftI2CMaster pots[DIGIPOT_I2C_NUM_CHANNELS] = {
SlowSoftI2CMaster { sda_pins[X_AXIS], DIGIPOTS_I2C_SCL }
SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_X, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 1
, SlowSoftI2CMaster { sda_pins[Y_AXIS], DIGIPOTS_I2C_SCL }
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_Y, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 2
, SlowSoftI2CMaster { sda_pins[Z_AXIS], DIGIPOTS_I2C_SCL }
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_Z, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 3
, SlowSoftI2CMaster { sda_pins[E_AXIS], DIGIPOTS_I2C_SCL }
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E0, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 4
, SlowSoftI2CMaster { sda_pins[E_AXIS + 1], DIGIPOTS_I2C_SCL }
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E1, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 5
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E2, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 6
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E3, DIGIPOTS_I2C_SCL)
#if DIGIPOT_I2C_NUM_CHANNELS > 7
, SlowSoftI2CMaster(DIGIPOTS_I2C_SDA_E4, DIGIPOTS_I2C_SCL)
#endif
#endif
#endif
#endif
#endif
#endif
@@ -85,18 +78,23 @@ static void i2c_send(const uint8_t channel, const byte v) {
// This is for the MCP4018 I2C based digipot
void digipot_i2c_set_current(const uint8_t channel, const float current) {
i2c_send(channel, current_to_wiper(_MIN(_MAX(current, 0), float(DIGIPOT_A4988_MAX_CURRENT))));
const float ival = _MIN(_MAX(current, 0), float(DIGIPOT_MCP4018_MAX_VALUE));
i2c_send(channel, current_to_wiper(ival));
}
void digipot_i2c_init() {
static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
LOOP_L_N(i, DIGIPOT_I2C_NUM_CHANNELS) pots[i].i2c_init();
LOOP_L_N(i, DIGIPOT_I2C_NUM_CHANNELS)
pots[i].i2c_init();
// setup initial currents as defined in Configuration_adv.h
// 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))
digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
}
#endif // DIGIPOT_I2C && DIGIPOT_MCP4018
#endif // DIGIPOT_MCP4018