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Store Mix factors as reciprocals and multiply

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This commit is contained in:
Scott Lahteine 2016-11-12 14:33:07 -06:00
parent 06f2282f82
commit f663220e87
3 changed files with 18 additions and 17 deletions
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31
Marlin/Marlin_main.cpp
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@ -590,7 +590,7 @@ float cartes[XYZ] = { 0 };
#endif
#if ENABLED(MIXING_EXTRUDER)
float mixing_factor[MIXING_STEPPERS];
float mixing_factor[MIXING_STEPPERS]; // Reciprocal of mix proportion. 0.0 = off, otherwise >= 1.0.
#if MIXING_VIRTUAL_TOOLS > 1
float mixing_virtual_tool_mix[MIXING_VIRTUAL_TOOLS][MIXING_STEPPERS];
#endif
@ -2650,17 +2650,11 @@ static void homeaxis(AxisEnum axis) {
void normalize_mix() {
float mix_total = 0.0;
for (int i = 0; i < MIXING_STEPPERS; i++) {
float v = mixing_factor[i];
if (v < 0) v = mixing_factor[i] = 0;
mix_total += v;
}
for (int i = 0; i < MIXING_STEPPERS; i++) mix_total += RECIPROCAL(mixing_factor[i]);
// Scale all values if they don't add up to ~1.0
if (mix_total < 0.9999 || mix_total > 1.0001) {
if (!NEAR(mix_total, 1.0)) {
SERIAL_PROTOCOLLNPGM("Warning: Mix factors must add up to 1.0. Scaling.");
float mix_scale = 1.0 / mix_total;
for (int i = 0; i < MIXING_STEPPERS; i++)
mixing_factor[i] *= mix_scale;
for (int i = 0; i < MIXING_STEPPERS; i++) mixing_factor[i] *= mix_total;
}
}
@ -2670,9 +2664,11 @@ static void homeaxis(AxisEnum axis) {
// The total "must" be 1.0 (but it will be normalized)
void gcode_get_mix() {
const char* mixing_codes = "ABCDHI";
for (int i = 0; i < MIXING_STEPPERS; i++)
mixing_factor[i] = code_seen(mixing_codes[i]) ? code_value_float() : 0;
for (int i = 0; i < MIXING_STEPPERS; i++) {
float v = code_seen(mixing_codes[i]) ? code_value_float() : 0.0;
NOLESS(v, 0.0);
mixing_factor[i] = RECIPROCAL(v);
}
normalize_mix();
}
#endif
@ -7142,8 +7138,11 @@ inline void gcode_M907() {
*/
inline void gcode_M163() {
int mix_index = code_seen('S') ? code_value_int() : 0;
float mix_value = code_seen('P') ? code_value_float() : 0.0;
if (mix_index < MIXING_STEPPERS) mixing_factor[mix_index] = mix_value;
if (mix_index < MIXING_STEPPERS) {
float mix_value = code_seen('P') ? code_value_float() : 0.0;
NOLESS(mix_value, 0.0);
mixing_factor[mix_index] = RECIPROCAL(mix_value);
}
}
#if MIXING_VIRTUAL_TOOLS > 1
@ -9881,7 +9880,7 @@ void setup() {
#if ENABLED(MIXING_EXTRUDER) && MIXING_VIRTUAL_TOOLS > 1
// Initialize mixing to 100% color 1
for (uint8_t i = 0; i < MIXING_STEPPERS; i++)
mixing_factor[i] = (i == 0) ? 1 : 0;
mixing_factor[i] = (i == 0) ? 1.0 : 0.0;
for (uint8_t t = 0; t < MIXING_VIRTUAL_TOOLS; t++)
for (uint8_t i = 0; i < MIXING_STEPPERS; i++)
mixing_virtual_tool_mix[t][i] = mixing_factor[i];

2
Marlin/macros.h
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@ -133,4 +133,6 @@
#define NEAR_ZERO(x) ((x) > -0.000001 && (x) < 0.000001)
#define NEAR(x,y) NEAR_ZERO((x)-(y))
#define RECIPROCAL(x) (NEAR_ZERO(x) ? 0.0 : 1.0 / (x))
#endif //__MACROS_H

2
Marlin/planner.cpp
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@ -750,7 +750,7 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
// For a mixing extruder, get a magnified step_event_count for each
#if ENABLED(MIXING_EXTRUDER)
for (uint8_t i = 0; i < MIXING_STEPPERS; i++)
block->mix_event_count[i] = UNEAR_ZERO(mixing_factor[i]) ? 0 : block->step_event_count / mixing_factor[i];
block->mix_event_count[i] = mixing_factor[i] * block->step_event_count;
#endif
#if FAN_COUNT > 0