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Added automatic backlash correction to Mini 2 (T2220)

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Added experimental backlash correction to Mini 2 FW:

  - "G29" will now measure backlash on each probe point and
    take lowest reading as backlash that can be corrected
    for in software.

  - "G29 V1" will print the measured backlash.

  - When bed-leveling is enabled, changes in directions of
    Z-stepper motions will cause the FW to inject extra motion
    to take up the backlash.
master
Marcio Teixeira 7 years ago
parent 6e29795a80
commit 98c783cde8
3 changed files with 76 additions and 50 deletions
Show Stats Download Patch File Download Diff File

118
Marlin/Conditionals_LulzBot.h
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@ -13,7 +13,7 @@
* got disabled.
*/
#define LULZBOT_FW_VERSION ".37" // Change this with each update
#define LULZBOT_FW_VERSION ".40" // Change this with each update
#if ( \
!defined(LULZBOT_Gladiola_Mini) && \
@ -116,6 +116,7 @@
#define LULZBOT_REPROBE_EXTENDED_RECOVERY
#define LULZBOT_USE_TMC_STEALTHCHOP_Z
#define LULZBOT_USE_Z_BELT
#define LULZBOT_USE_Z_BACKLASH_COMPENSATION
#define LULZBOT_BAUDRATE 250000
#define LULZBOT_PRINTCOUNTER
#define LULZBOT_USE_32_MICROSTEPS_ON_Z
@ -646,54 +647,6 @@
"M117 Leveling done." /* Set LCD status */
#endif
/****************************** BACKLASH COMPENSATION **************************/
#if defined(LULZBOT_IS_MINI) && defined(LULZBOT_USE_Z_BELT)
//#define LULZBOT_AXIS_BACKLASH {0.00, 0.00, 0.35, 0}
#endif
#if defined(LULZBOT_AXIS_BACKLASH)
#define SIGN(v) ((v < 0) ? -1.0 : 1.0)
#define LULZBOT_AXIS_BACKLASH_CORRECTION \
{ \
static const float backlash[NUM_AXIS] = LULZBOT_AXIS_BACKLASH; \
static uint8_t last_direction_bits; \
static bool is_correction = false; \
if(!is_correction && planner.leveling_active) { \
uint8_t changed_dir = last_direction_bits ^ dm; \
/* Ignore direction change if no steps are taken in that direction */ \
if(da == 0) CBI(changed_dir, X_AXIS); \
if(db == 0) CBI(changed_dir, Y_AXIS); \
if(dc == 0) CBI(changed_dir, Z_AXIS); \
if(de == 0) CBI(changed_dir, E_AXIS); \
/* Update the direction bits */ \
last_direction_bits ^= changed_dir; \
/* When there is motion in an opposing direction, apply the backlash correction */ \
if(changed_dir) { \
long saved_position[NUM_AXIS] = { 0 }; \
COPY(saved_position, position); \
const long x_backlash = TEST(changed_dir, X_AXIS) ? backlash[X_AXIS] * axis_steps_per_mm[X_AXIS] * SIGN(da) : 0; \
const long y_backlash = TEST(changed_dir, Y_AXIS) ? backlash[Y_AXIS] * axis_steps_per_mm[Y_AXIS] * SIGN(db) : 0; \
const long z_backlash = TEST(changed_dir, Z_AXIS) ? backlash[Z_AXIS] * axis_steps_per_mm[Z_AXIS] * SIGN(dc) : 0; \
const long e_backlash = TEST(changed_dir, E_AXIS) ? backlash[E_AXIS] * axis_steps_per_mm[E_AXIS] * SIGN(de) : 0; \
is_correction = true; /* Avoid infinite recursion */ \
buffer_segment( \
(position[X_AXIS] + x_backlash)/axis_steps_per_mm[X_AXIS], \
(position[Y_AXIS] + y_backlash)/axis_steps_per_mm[Y_AXIS], \
(position[Z_AXIS] + z_backlash)/axis_steps_per_mm[Z_AXIS], \
(position[E_AXIS] + e_backlash)/axis_steps_per_mm[E_AXIS_N], \
fr_mm_s, extruder \
); \
is_correction = false; \
COPY(position, saved_position); \
} \
} \
}
#else
#define LULZBOT_AXIS_BACKLASH_CORRECTION
#endif
/*************************** COMMON TOOLHEADS PARAMETERS ***********************/
#define LULZBOT_DEFAULT_EJERK 10.0
@ -1747,6 +1700,73 @@
#define LULZBOT_BED_LEVELING_SUMMARY
#endif
/****************************** BACKLASH COMPENSATION **************************/
#if defined(LULZBOT_USE_Z_BACKLASH_COMPENSATION)
#define LULZBOT_BACKLASH_AUTOPROBE_RESOLUTION 0.005
#define LULZBOT_BACKLASH_AUTOPROBE_LIMIT 0.5
#if ENABLED(LULZBOT_Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN)
#if defined(LULZBOT_Z_MIN_ENDSTOP_INVERTING)
#define LULZBOT_TEST_PROBE_PIN !READ(Z_MIN_PIN)
#else
#define LULZBOT_TEST_PROBE_PIN READ(Z_MIN_PIN)
#endif
#else
#if defined(LULZBOT_Z_MIN_PROBE_ENDSTOP_INVERTING)
#define LULZBOT_TEST_PROBE_PIN !READ(Z_MIN_PROBE)
#else
#define LULZBOT_TEST_PROBE_PIN READ(Z_MIN_PROBE)
#endif
#endif
#define LULZBOT_BACKLASH_AUTOPROBE_DECL int32_t z_backlash_steps = 0;
#define LULZBOT_BACKLASH_AUTOPROBE_EXTERN extern int32_t z_backlash_steps;
#define LULZBOT_BACKLASH_AUTOPROBE_RESET z_backlash_steps = LULZBOT_BACKLASH_AUTOPROBE_LIMIT * planner.axis_steps_per_mm[Z_AXIS];
#define LULZBOT_BACKLASH_AUTOPROBE \
{ \
float start_height = current_position[Z_AXIS]; \
while(current_position[Z_AXIS] < (start_height + LULZBOT_BACKLASH_AUTOPROBE_LIMIT) && LULZBOT_TEST_PROBE_PIN) { \
do_blocking_move_to_z(current_position[Z_AXIS] + LULZBOT_BACKLASH_AUTOPROBE_RESOLUTION, MMM_TO_MMS(Z_PROBE_SPEED_SLOW)); \
} \
const float measured_backlash_mm = current_position[Z_AXIS] - start_height; \
z_backlash_steps = min(z_backlash_steps, measured_backlash_mm * planner.axis_steps_per_mm[Z_AXIS]); \
}
#define LULZBOT_BACKLASH_CORRECTION \
{ \
static bool last_z_direction; \
static bool is_correction = false; \
if(!is_correction && planner.leveling_active) { \
const bool new_z_direction = TEST(dm, Z_AXIS); \
/* When there is motion in an opposing Z direction, apply the backlash correction */ \
if((last_z_direction != new_z_direction) && (dc != 0)) { \
last_z_direction = new_z_direction; \
int32_t saved_position[NUM_AXIS], tweaked_position[XYZE]; \
COPY( saved_position, position); \
COPY(tweaked_position, position); \
tweaked_position[Z_AXIS] += dc < 0 ? -z_backlash_steps : z_backlash_steps; \
is_correction = true; /* Avoid infinite recursion */ \
_buffer_steps(tweaked_position, fr_mm_s, extruder); \
is_correction = false; \
COPY(position, saved_position); \
} \
} \
}
#define LULZBOT_BACKLASH_AUTOPROBE_SUMMARY \
SERIAL_ECHOLNPAIR("Measured Z-axis backlash: ", float(z_backlash_steps) / planner.axis_steps_per_mm[Z_AXIS]);
#else
#define LULZBOT_BACKLASH_AUTOPROBE
#define LULZBOT_BACKLASH_AUTOPROBE_DECL
#define LULZBOT_BACKLASH_AUTOPROBE_EXTERN
#define LULZBOT_BACKLASH_AUTOPROBE_RESET
#define LULZBOT_BACKLASH_CORRECTION
#define LULZBOT_BACKLASH_AUTOPROBE_SUMMARY
#endif
/******************************** MOTOR CURRENTS *******************************/
// Values for XYZ vary by printer model, values for E vary by toolhead.

4
Marlin/Marlin_main.cpp
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@ -363,6 +363,7 @@
LULZBOT_EXECUTE_IMMEDIATE_DECL
LULZBOT_G29_WITH_RETRY_DECL
LULZBOT_BED_LEVELING_DECL
LULZBOT_BACKLASH_AUTOPROBE_DECL
bool Running = true;
@ -2275,6 +2276,7 @@ static void clean_up_after_endstop_or_probe_move() {
// move down slowly to find bed
//if (do_probe_move(-10, Z_PROBE_SPEED_SLOW)) return NAN;
LULZBOT_DO_PROBE_MOVE(Z_PROBE_SPEED_SLOW);
LULZBOT_BACKLASH_AUTOPROBE
#if MULTIPLE_PROBING > 2
probes_total += current_position[Z_AXIS];
@ -5189,6 +5191,7 @@ void home_all_axes() { gcode_G28(true); }
if (verbose_level) {
LULZBOT_BED_LEVELING_SUMMARY
LULZBOT_BACKLASH_AUTOPROBE_SUMMARY
SERIAL_PROTOCOLPGM("Eqn coefficients: a: ");
SERIAL_PROTOCOL_F(plane_equation_coefficients[0], 8);
@ -11824,6 +11827,7 @@ void process_parsed_command(
#if HAS_LEVELING
case 29: // G29 Detailed Z probe, probes the bed at 3 or more points,
// or provides access to the UBL System if enabled.
LULZBOT_BACKLASH_AUTOPROBE_RESET
#if defined(LULZBOT_G29_COMMAND)
LULZBOT_G29_COMMAND
#else

4
Marlin/planner.cpp
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@ -73,6 +73,8 @@
#include "mesh_bed_leveling.h"
#endif
LULZBOT_BACKLASH_AUTOPROBE_EXTERN
Planner planner;
// public:
@ -787,7 +789,7 @@ void Planner::_buffer_steps(const int32_t (&target)[XYZE], float fr_mm_s, const
#endif
if (de < 0) SBI(dm, E_AXIS);
LULZBOT_AXIS_BACKLASH_CORRECTION
LULZBOT_BACKLASH_CORRECTION
const float esteps_float = de * e_factor[extruder];
const int32_t esteps = abs(esteps_float) + 0.5;

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