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Save lots of PROGMEM, ~20b SRAM with DIGIPOT_I2C

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master
Scott Lahteine 8 years ago
parent 4134a6b526
commit c9e3caf928
4 changed files with 53 additions and 28 deletions
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2
Marlin/Marlin_main.cpp
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@ -782,7 +782,7 @@ extern "C" {
#endif // !SDSUPPORT
#if ENABLED(DIGIPOT_I2C)
extern void digipot_i2c_set_current(int channel, float current);
extern void digipot_i2c_set_current(uint8_t channel, float current);
extern void digipot_i2c_init();
#endif

10
Marlin/SanityCheck.h
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@ -1165,6 +1165,16 @@ static_assert(1 >= 0
#error "Enable STEALTHCHOP to use HYBRID_THRESHOLD."
#endif
/**
* Digipot requirement
*/
#if ENABLED(DIGIPOT_MCP4018)
#if !defined(DIGIPOTS_I2C_SDA_X) || !defined(DIGIPOTS_I2C_SDA_Y) || !defined(DIGIPOTS_I2C_SDA_Z) \
|| !defined(DIGIPOTS_I2C_SDA_E0) || !defined(DIGIPOTS_I2C_SDA_E1)
#error "DIGIPOT_MCP4018 requires DIGIPOTS_I2C_SDA_* pins to be defined."
#endif
#endif
/**
* Require 4 or more elements in per-axis initializers
*/

57
Marlin/digipot_mcp4018.cpp
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@ -24,6 +24,7 @@
#if ENABLED(DIGIPOT_I2C) && ENABLED(DIGIPOT_MCP4018)
#include "enum.h"
#include "Stream.h"
#include "utility/twi.h"
#include <SlowSoftI2CMaster.h> //https://github.com/stawel/SlowSoftI2CMaster
@ -38,31 +39,47 @@
#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_A4988_MAX_VALUE)/DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax))
//TODO: MAX_CURRENT -0.5A ?? (currently set to 2A, max possible current 2.5A)
#define DIGIPOT_A4988_MAX_CURRENT (DIGIPOT_A4988_Itripmax(DIGIPOT_A4988_Vrefmax) - 0.5)
static byte current_to_wiper(float current) {
return byte(ceil(float((DIGIPOT_A4988_FACTOR * current))));
static byte current_to_wiper(const float current) {
return byte(ceil(float(DIGIPOT_A4988_FACTOR) * current));
}
static uint8_t sda_pins[DIGIPOT_I2C_NUM_CHANNELS] = {
DIGIPOTS_I2C_SDA_X,
DIGIPOTS_I2C_SDA_Y,
DIGIPOTS_I2C_SDA_Z,
DIGIPOTS_I2C_SDA_E0,
DIGIPOTS_I2C_SDA_E1,
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[0], DIGIPOTS_I2C_SCL },
SlowSoftI2CMaster { sda_pins[1], DIGIPOTS_I2C_SCL },
SlowSoftI2CMaster { sda_pins[2], DIGIPOTS_I2C_SCL },
SlowSoftI2CMaster { sda_pins[3], DIGIPOTS_I2C_SCL },
SlowSoftI2CMaster { sda_pins[4], DIGIPOTS_I2C_SCL }
SlowSoftI2CMaster { sda_pins[X_AXIS], DIGIPOTS_I2C_SCL }
#if DIGIPOT_I2C_NUM_CHANNELS > 1
, SlowSoftI2CMaster { sda_pins[Y_AXIS], DIGIPOTS_I2C_SCL }
#if DIGIPOT_I2C_NUM_CHANNELS > 2
, SlowSoftI2CMaster { sda_pins[Z_AXIS], DIGIPOTS_I2C_SCL }
#if DIGIPOT_I2C_NUM_CHANNELS > 3
, SlowSoftI2CMaster { sda_pins[E_AXIS], DIGIPOTS_I2C_SCL }
#if DIGIPOT_I2C_NUM_CHANNELS > 4
, SlowSoftI2CMaster { sda_pins[E_AXIS + 1], DIGIPOTS_I2C_SCL }
#endif
#endif
#endif
#endif
};
static void i2c_send(int channel, byte v) {
static void 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) << 1) | I2C_WRITE);
pots[channel].i2c_write(v);
@ -71,21 +88,19 @@ static void i2c_send(int channel, byte v) {
}
// This is for the MCP4018 I2C based digipot
void digipot_i2c_set_current(int channel, float current) {
current = min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT));
i2c_send(channel, current_to_wiper(current));
void digipot_i2c_set_current(uint8_t channel, float current) {
i2c_send(channel, current_to_wiper(min(max(current, 0.0f), float(DIGIPOT_A4988_MAX_CURRENT))));
}
void digipot_i2c_init() {
const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
for (uint8_t i = 0; i < DIGIPOT_I2C_NUM_CHANNELS; i++)
pots[i].i2c_init();
// setup initial currents as defined in Configuration_adv.h
for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
digipot_i2c_set_current(i, digipot_motor_current[i]);
digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
}
#endif // DIGIPOT_I2C && DIGIPOT_MCP4018

12
Marlin/digipot_mcp4451.cpp
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@ -37,11 +37,11 @@
#define DIGIPOT_I2C_MAX_CURRENT 2.5
#endif
static byte current_to_wiper(float current) {
static byte current_to_wiper(const float current) {
return byte(ceil(float((DIGIPOT_I2C_FACTOR * current))));
}
static void i2c_send(byte addr, byte a, byte b) {
static void i2c_send(const byte addr, const byte a, const byte b) {
Wire.beginTransmission(addr);
Wire.write(a);
Wire.write(b);
@ -49,7 +49,7 @@ static void i2c_send(byte addr, byte a, byte b) {
}
// This is for the MCP4451 I2C based digipot
void digipot_i2c_set_current(int channel, float current) {
void digipot_i2c_set_current(uint8_t channel, float current) {
current = min((float) max(current, 0.0f), DIGIPOT_I2C_MAX_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
@ -69,11 +69,11 @@ void digipot_i2c_set_current(int channel, float current) {
}
void digipot_i2c_init() {
const float digipot_motor_current[] = DIGIPOT_I2C_MOTOR_CURRENTS;
static const float digipot_motor_current[] PROGMEM = DIGIPOT_I2C_MOTOR_CURRENTS;
Wire.begin();
// setup initial currents as defined in Configuration_adv.h
for (int i = 0; i < COUNT(digipot_motor_current); i++)
digipot_i2c_set_current(i, digipot_motor_current[i]);
for (uint8_t i = 0; i < COUNT(digipot_motor_current); i++)
digipot_i2c_set_current(i, pgm_read_float(&digipot_motor_current[i]));
}
#endif // DIGIPOT_I2C

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