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stepper.cpp
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/*
stepper.c - stepper motor driver: executes motion plans using stepper motors
Part of Grbl
Copyright (c) 2009-2011 Simen Svale Skogsrud
Grbl 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.
Grbl 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 Grbl. If not, see <http://www.gnu.org/licenses/>.
*/
/* The timer calculations of this module informed by the 'RepRap cartesian firmware' by Zack Smith
and Philipp Tiefenbacher. */
#include "Marlin.h"
#include "stepper.h"
#include "planner.h"
#include "temperature.h"
#include "ultralcd.h"
#include "language.h"
#include "cardreader.h"
#include "speed_lookuptable.h"
#if DIGIPOTSS_PIN > -1
#include <SPI.h>
#endif
//===========================================================================
//=============================public variables ============================
//===========================================================================
block_t *current_block; // A pointer to the block currently being traced
//===========================================================================
//=============================private variables ============================
//===========================================================================
//static makes it inpossible to be called from outside of this file by extern.!
// Variables used by The Stepper Driver Interrupt
static unsigned char out_bits; // The next stepping-bits to be output
static long counter_x, // Counter variables for the bresenham line tracer
counter_y,
counter_z,
counter_e;
volatile static unsigned long step_events_completed; // The number of step events executed in the current block
#ifdef ADVANCE
static long advance_rate, advance, final_advance = 0;
static long old_advance = 0;
static long e_steps[3];
#endif
static long acceleration_time, deceleration_time;
//static unsigned long accelerate_until, decelerate_after, acceleration_rate, initial_rate, final_rate, nominal_rate;
static unsigned short acc_step_rate; // needed for deccelaration start point
static char step_loops;
static unsigned short OCR1A_nominal;
static unsigned short step_loops_nominal;
//float comptage=1;
volatile long endstops_trigsteps[3]={0,0,0};
volatile long endstops_stepsTotal,endstops_stepsDone;
static volatile bool endstop_x_hit=false;
static volatile bool endstop_y_hit=false;
static volatile bool endstop_z_hit=false;
static volatile bool endstop_e_hit=false;
#ifdef ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED
bool abort_on_endstop_hit = false;
#endif
static bool old_x_min_endstop=false;
static bool old_x_max_endstop=false;
static bool old_y_min_endstop=false;
static bool old_y_max_endstop=false;
static bool old_z_min_endstop=false;
static bool old_z_max_endstop=false;
static bool old_e0_endstop=false;
static bool old_e1_endstop=false;
bool Endstop_Left_avant=true;
bool Endstop_Left_apres=false;
bool Endstop_Right_avant=true;
bool Endstop_Right_apres=false;
static bool check_endstops = true;
volatile long count_position[NUM_AXIS] = { 0, 0, 0, 0};
volatile signed char count_direction[NUM_AXIS] = { 1, 1, 1, 1};
//===========================================================================
//=============================functions ============================
//===========================================================================
#define CHECK_ENDSTOPS if(check_endstops)
// intRes = intIn1 * intIn2 >> 16
// uses:
// r26 to store 0
// r27 to store the byte 1 of the 24 bit result
#define MultiU16X8toH16(intRes, charIn1, intIn2) \
asm volatile ( \
"clr r26 \n\t" \
"mul %A1, %B2 \n\t" \
"movw %A0, r0 \n\t" \
"mul %A1, %A2 \n\t" \
"add %A0, r1 \n\t" \
"adc %B0, r26 \n\t" \
"lsr r0 \n\t" \
"adc %A0, r26 \n\t" \
"adc %B0, r26 \n\t" \
"clr r1 \n\t" \
: \
"=&r" (intRes) \
: \
"d" (charIn1), \
"d" (intIn2) \
: \
"r26" \
)
// intRes = longIn1 * longIn2 >> 24
// uses:
// r26 to store 0
// r27 to store the byte 1 of the 48bit result
#define MultiU24X24toH16(intRes, longIn1, longIn2) \
asm volatile ( \
"clr r26 \n\t" \
"mul %A1, %B2 \n\t" \
"mov r27, r1 \n\t" \
"mul %B1, %C2 \n\t" \
"movw %A0, r0 \n\t" \
"mul %C1, %C2 \n\t" \
"add %B0, r0 \n\t" \
"mul %C1, %B2 \n\t" \
"add %A0, r0 \n\t" \
"adc %B0, r1 \n\t" \
"mul %A1, %C2 \n\t" \
"add r27, r0 \n\t" \
"adc %A0, r1 \n\t" \
"adc %B0, r26 \n\t" \
"mul %B1, %B2 \n\t" \
"add r27, r0 \n\t" \
"adc %A0, r1 \n\t" \
"adc %B0, r26 \n\t" \
"mul %C1, %A2 \n\t" \
"add r27, r0 \n\t" \
"adc %A0, r1 \n\t" \
"adc %B0, r26 \n\t" \
"mul %B1, %A2 \n\t" \
"add r27, r1 \n\t" \
"adc %A0, r26 \n\t" \
"adc %B0, r26 \n\t" \
"lsr r27 \n\t" \
"adc %A0, r26 \n\t" \
"adc %B0, r26 \n\t" \
"clr r1 \n\t" \
: \
"=&r" (intRes) \
: \
"d" (longIn1), \
"d" (longIn2) \
: \
"r26" , "r27" \
)
// Some useful constants
#define ENABLE_STEPPER_DRIVER_INTERRUPT() TIMSK1 |= (1<<OCIE1A)
#define DISABLE_STEPPER_DRIVER_INTERRUPT() TIMSK1 &= ~(1<<OCIE1A)
void checkHitEndstops()
{
if( endstop_x_hit || endstop_y_hit || endstop_z_hit || endstop_e_hit) {
SERIAL_ECHO_START;
SERIAL_ECHOPGM(MSG_ENDSTOPS_HIT);
if(endstop_x_hit) {
SERIAL_ECHOPAIR(" X:",(float)endstops_trigsteps[X_AXIS]/axis_steps_per_unit[X_AXIS]);
LCD_MESSAGEPGM(MSG_ENDSTOPS_HIT "X");
}
if(endstop_y_hit) {
SERIAL_ECHOPAIR(" Y:",(float)endstops_trigsteps[Y_AXIS]/axis_steps_per_unit[Y_AXIS]);
LCD_MESSAGEPGM(MSG_ENDSTOPS_HIT "Y");
}
if(endstop_z_hit) {
SERIAL_ECHOPAIR(" Z:",(float)endstops_trigsteps[Z_AXIS]/axis_steps_per_unit[Z_AXIS]);
LCD_MESSAGEPGM(MSG_ENDSTOPS_HIT "Z");
}
if(endstop_e_hit) {
SERIAL_ECHOPAIR(" E:",(float)endstops_trigsteps[E_AXIS]/axis_steps_per_unit[E_AXIS]);
LCD_MESSAGEPGM(MSG_ENDSTOPS_HIT "E");
}
SERIAL_ECHOLN("");
endstop_x_hit=false;
endstop_y_hit=false;
endstop_z_hit=false;
endstop_e_hit=false;
#ifdef ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED
if (abort_on_endstop_hit)
{
card.sdprinting = false;
card.closefile();
quickStop();
setTargetHotend0(0);
setTargetHotend1(0);
setTargetHotend2(0);
}
#endif
}
}
void endstops_hit_on_purpose()
{
endstop_x_hit=false;
endstop_y_hit=false;
endstop_z_hit=false;
endstop_e_hit=false;
}
void enable_endstops(bool check)
{
check_endstops = check;
}
// __________________________
// /| |\ _________________ ^
// / | | \ /| |\ |
// / | | \ / | | \ s
// / | | | | | \ p
// / | | | | | \ e
// +-----+------------------------+---+--+---------------+----+ e
// | BLOCK 1 | BLOCK 2 | d
//
// time ----->
//
// The trapezoid is the shape the speed curve over time. It starts at block->initial_rate, accelerates
// first block->accelerate_until step_events_completed, then keeps going at constant speed until
// step_events_completed reaches block->decelerate_after after which it decelerates until the trapezoid generator is reset.
// The slope of acceleration is calculated with the leib ramp alghorithm.
void st_wake_up() {
// TCNT1 = 0;
ENABLE_STEPPER_DRIVER_INTERRUPT();
}
void step_wait(){
for(int8_t i=0; i < 6; i++){
}
}
FORCE_INLINE unsigned short calc_timer(unsigned short step_rate)
{
unsigned short timer;
if(step_rate > MAX_STEP_FREQUENCY) step_rate = MAX_STEP_FREQUENCY;
if(step_rate > 20000)
{ // If steprate > 20kHz >> step 4 times
step_rate = (step_rate >> 2)&0x3fff;
step_loops = 4;
}
else if(step_rate > 10000) { // If steprate > 10kHz >> step 2 times
step_rate = (step_rate >> 1)&0x7fff;
step_loops = 2;
}
else {
step_loops = 1;
}
if(step_rate < (F_CPU/500000)) step_rate = (F_CPU/500000);
step_rate -= (F_CPU/500000); // Correct for minimal speed
if(step_rate >= (8*256)){ // higher step rate
unsigned short table_address = (unsigned short)&speed_lookuptable_fast[(unsigned char)(step_rate>>8)][0];
unsigned char tmp_step_rate = (step_rate & 0x00ff);
unsigned short gain = (unsigned short)pgm_read_word_near(table_address+2);
MultiU16X8toH16(timer, tmp_step_rate, gain);
timer = (unsigned short)pgm_read_word_near(table_address) - timer;
}
else { // lower step rates
unsigned short table_address = (unsigned short)&speed_lookuptable_slow[0][0];
table_address += ((step_rate)>>1) & 0xfffc;
timer = (unsigned short)pgm_read_word_near(table_address);
timer -= (((unsigned short)pgm_read_word_near(table_address+2) * (unsigned char)(step_rate & 0x0007))>>3);
}
if(timer < 100) { timer = 100; MYSERIAL.print(MSG_STEPPER_TO_HIGH); MYSERIAL.println(step_rate); }//(20kHz this should never happen)
return timer;
}
// Initializes the trapezoid generator from the current block. Called whenever a new
// block begins.
FORCE_INLINE void trapezoid_generator_reset() {
#ifdef ADVANCE
advance = current_block->initial_advance;
final_advance = current_block->final_advance;
// Do E steps + advance steps
e_steps[current_block->active_extruder] += ((advance >>8) - old_advance);
old_advance = advance >>8;
#endif
deceleration_time = 0;
// step_rate to timer interval
OCR1A_nominal = calc_timer(current_block->nominal_rate);
// make a note of the number of step loops required at nominal speed
step_loops_nominal = step_loops;
acc_step_rate = current_block->initial_rate;
acceleration_time = calc_timer(acc_step_rate);
OCR1A = acceleration_time;
// SERIAL_ECHO_START;
// SERIAL_ECHOPGM("advance :");
// SERIAL_ECHO(current_block->advance/256.0);
// SERIAL_ECHOPGM("advance rate :");
// SERIAL_ECHO(current_block->advance_rate/256.0);
// SERIAL_ECHOPGM("initial advance :");
// SERIAL_ECHO(current_block->initial_advance/256.0);
// SERIAL_ECHOPGM("final advance :");
// SERIAL_ECHOLN(current_block->final_advance/256.0);
}
// "The Stepper Driver Interrupt" - This timer interrupt is the workhorse.
// It pops blocks from the block_buffer and executes them by pulsing the stepper pins appropriately.
ISR(TIMER1_COMPA_vect)
{
// If there is no current block, attempt to pop one from the buffer
if (current_block == NULL)
{
// Anything in the buffer?
current_block = plan_get_current_block();
if (current_block != NULL)
{
current_block->busy = true;
trapezoid_generator_reset();
counter_x = -(current_block->step_event_count >> 1);
counter_y = counter_x;
counter_z = counter_x;
counter_e = counter_x;
step_events_completed = 0;
#ifdef Z_LATE_ENABLE
if(current_block->steps_z > 0)
{
enable_z();
OCR1A = 2000; //1ms wait
return;
}
#endif
// #ifdef ADVANCE
// e_steps[current_block->active_extruder] = 0;
// #endif
}
else
{
OCR1A=2000; // 1kHz.
}
}
if (current_block != NULL)
{
// Set directions TO DO This should be done once during init of trapezoid. Endstops -> interrupt
out_bits = current_block->direction_bits;
// Set direction en check limit switches
if ((out_bits & (1<<X_AXIS)) != 0) { // stepping along -X axis
#if !defined COREXY //NOT COREXY
WRITE(X_DIR_PIN, INVERT_X_DIR);
#endif
count_direction[X_AXIS]=-1;
CHECK_ENDSTOPS
{
#if X_MIN_PIN > -1
bool x_min_endstop=(READ(X_MIN_PIN) != X_ENDSTOPS_INVERTING);
if(x_min_endstop && old_x_min_endstop && (current_block->steps_x > 0)) {
endstops_trigsteps[X_AXIS] = count_position[X_AXIS];
endstop_x_hit=true;
step_events_completed = current_block->step_event_count;
}
old_x_min_endstop = x_min_endstop;
#endif
}
}
else { // +direction
#if !defined COREXY //NOT COREXY
WRITE(X_DIR_PIN,!INVERT_X_DIR);
#endif
count_direction[X_AXIS]=1;
CHECK_ENDSTOPS
{
#if X_MAX_PIN > -1
bool x_max_endstop=(READ(X_MAX_PIN) != X_ENDSTOPS_INVERTING);
if(x_max_endstop && old_x_max_endstop && (current_block->steps_x > 0)){
endstops_trigsteps[X_AXIS] = count_position[X_AXIS];
endstop_x_hit=true;
step_events_completed = current_block->step_event_count;
}
old_x_max_endstop = x_max_endstop;
#endif
}
}
if ((out_bits & (1<<Y_AXIS)) != 0) { // -direction
#if !defined COREXY //NOT COREXY
WRITE(Y_DIR_PIN,INVERT_Y_DIR);
#endif
count_direction[Y_AXIS]=-1;
CHECK_ENDSTOPS
{
#if Y_MIN_PIN > -1
bool y_min_endstop=(READ(Y_MIN_PIN) != Y_ENDSTOPS_INVERTING);
if(y_min_endstop && old_y_min_endstop && (current_block->steps_y > 0)) {
endstops_trigsteps[Y_AXIS] = count_position[Y_AXIS];
endstop_y_hit=true;
step_events_completed = current_block->step_event_count;
}
old_y_min_endstop = y_min_endstop;
#endif
}
}
else { // +direction
#if !defined COREXY //NOT COREXY
WRITE(Y_DIR_PIN,!INVERT_Y_DIR);
#endif
count_direction[Y_AXIS]=1;
CHECK_ENDSTOPS
{
#if Y_MAX_PIN > -1
bool y_max_endstop=(READ(Y_MAX_PIN) != Y_ENDSTOPS_INVERTING);
if(y_max_endstop && old_y_max_endstop && (current_block->steps_y > 0)){
endstops_trigsteps[Y_AXIS] = count_position[Y_AXIS];
endstop_y_hit=true;
step_events_completed = current_block->step_event_count;
}
old_y_max_endstop = y_max_endstop;
#endif
}
}
#ifdef COREXY //coreXY kinematics defined
if((current_block->steps_x >= current_block->steps_y)&&((out_bits & (1<<X_AXIS)) == 0)){ //+X is major axis
WRITE(X_DIR_PIN, !INVERT_X_DIR);
WRITE(Y_DIR_PIN, !INVERT_Y_DIR);
}
if((current_block->steps_x >= current_block->steps_y)&&((out_bits & (1<<X_AXIS)) != 0)){ //-X is major axis
WRITE(X_DIR_PIN, INVERT_X_DIR);
WRITE(Y_DIR_PIN, INVERT_Y_DIR);
}
if((current_block->steps_y > current_block->steps_x)&&((out_bits & (1<<Y_AXIS)) == 0)){ //+Y is major axis
WRITE(X_DIR_PIN, !INVERT_X_DIR);
WRITE(Y_DIR_PIN, INVERT_Y_DIR);
}
if((current_block->steps_y > current_block->steps_x)&&((out_bits & (1<<Y_AXIS)) != 0)){ //-Y is major axis
WRITE(X_DIR_PIN, INVERT_X_DIR);
WRITE(Y_DIR_PIN, !INVERT_Y_DIR);
}
#endif //coreXY
if ((out_bits & (1<<Z_AXIS)) != 0) { // -direction
WRITE(Z_DIR_PIN,INVERT_Z_DIR);
#ifdef Z_DUAL_STEPPER_DRIVERS
WRITE(Z2_DIR_PIN,INVERT_Z_DIR);
#endif
count_direction[Z_AXIS]=-1;
CHECK_ENDSTOPS
{
#if Z_MIN_PIN > -1
bool z_min_endstop=(READ(Z_MIN_PIN) != Z_ENDSTOPS_INVERTING);
if(z_min_endstop && old_z_min_endstop && (current_block->steps_z > 0)) {
endstops_trigsteps[Z_AXIS] = count_position[Z_AXIS];
endstop_z_hit=true;
step_events_completed = current_block->step_event_count;
}
old_z_min_endstop = z_min_endstop;
#endif
}
}
else { // +direction
WRITE(Z_DIR_PIN,!INVERT_Z_DIR);
#ifdef Z_DUAL_STEPPER_DRIVERS
WRITE(Z2_DIR_PIN,!INVERT_Z_DIR);
#endif
count_direction[Z_AXIS]=1;
CHECK_ENDSTOPS
{
#if Z_MAX_PIN > -1
bool z_max_endstop=(READ(Z_MAX_PIN) != Z_ENDSTOPS_INVERTING);
if(z_max_endstop && old_z_max_endstop && (current_block->steps_z > 0)) {
endstops_trigsteps[Z_AXIS] = count_position[Z_AXIS];
endstop_z_hit=true;
step_events_completed = current_block->step_event_count;
}
old_z_max_endstop = z_max_endstop;
#endif
}
}
#ifndef ADVANCE
if ((out_bits & (1<<E_AXIS)) != 0) { // -direction
REV_E_DIR();
count_direction[E_AXIS]=-1;
CHECK_ENDSTOPS
{
#if PRIVATE_ENDSTOPS1 > -1
bool e0_endstop = (READ(PRIVATE_ENDSTOPS1) != E_ENDSTOPS_INVERTING);
if(!e0_endstop && !old_e0_endstop && (current_block->steps_e > 0) && unloading_command
&& current_block->steps_e == axis_steps_per_unit[E_AXIS] * UNLOADING_PART3_LENGTH) { // only check endstop in part3 of unloading
endstops_trigsteps[E_AXIS] = count_position[E_AXIS];
endstop_e_hit=true;
step_events_completed = current_block->step_event_count;
}
old_e0_endstop = e0_endstop;
#endif
#if PRIVATE_ENDSTOPS2 > -1
bool e1_endstop = (READ(PRIVATE_ENDSTOPS2) != E_ENDSTOPS_INVERTING);
if(!e1_endstop && !old_e1_endstop && (current_block->steps_e > 0) && unloading_command
&& current_block->steps_e == axis_steps_per_unit[E_AXIS] * UNLOADING_PART3_LENGTH) { // only check endstop in part3 of unloading
endstops_trigsteps[E_AXIS] = count_position[E_AXIS];
endstop_e_hit=true;
step_events_completed = current_block->step_event_count;
}
old_e1_endstop = e1_endstop;
#endif
}
}
else { // +direction
NORM_E_DIR();
count_direction[E_AXIS]=1;
CHECK_ENDSTOPS
{
/*#if PRIVATE_ENDSTOPS2 > -1
bool e_min_endstop=(READ(PRIVATE_ENDSTOPS2) != E_ENDSTOPS_INVERTING);
if(e_min_endstop && old_e_min_endstop && (current_block->steps_e > 0)) {
endstops_trigsteps[E_AXIS] = count_position[E_AXIS];
endstop_e_hit=true;
step_events_completed = current_block->step_event_count;
}
old_e_min_endstop = e_min_endstop;
#endif*/
}
}
#endif //!ADVANCE
for(int8_t i=0; i < step_loops; i++)
{
// Take multiple steps per interrupt (For high speed moves)
#ifndef AT90USB
MSerial.checkRx(); // Check for serial chars.
#endif
#ifdef ADVANCE
counter_e += current_block->steps_e;
if (counter_e > 0) {
counter_e -= current_block->step_event_count;
if ((out_bits & (1<<E_AXIS)) != 0) { // - direction
e_steps[current_block->active_extruder]--;
}
else {
e_steps[current_block->active_extruder]++;
}
}
#endif //ADVANCE
#if !defined COREXY
counter_x += current_block->steps_x;
if (counter_x > 0) {
WRITE(X_STEP_PIN, !INVERT_X_STEP_PIN);
counter_x -= current_block->step_event_count;
count_position[X_AXIS]+=count_direction[X_AXIS];
WRITE(X_STEP_PIN, INVERT_X_STEP_PIN);
}
counter_y += current_block->steps_y;
if (counter_y > 0) {
WRITE(Y_STEP_PIN, !INVERT_Y_STEP_PIN);
counter_y -= current_block->step_event_count;
count_position[Y_AXIS]+=count_direction[Y_AXIS];
WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN);
}
#endif
#ifdef COREXY
counter_x += current_block->steps_x;
counter_y += current_block->steps_y;
if ((counter_x > 0)&&!(counter_y>0)){ //X step only
WRITE(X_STEP_PIN, !INVERT_X_STEP_PIN);
WRITE(Y_STEP_PIN, !INVERT_Y_STEP_PIN);
counter_x -= current_block->step_event_count;
count_position[X_AXIS]+=count_direction[X_AXIS];
WRITE(X_STEP_PIN, INVERT_X_STEP_PIN);
WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN);
}
if (!(counter_x > 0)&&(counter_y>0)){ //Y step only
WRITE(X_STEP_PIN, !INVERT_X_STEP_PIN);
WRITE(Y_STEP_PIN, !INVERT_Y_STEP_PIN);
counter_y -= current_block->step_event_count;
count_position[Y_AXIS]+=count_direction[Y_AXIS];
WRITE(X_STEP_PIN, INVERT_X_STEP_PIN);
WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN);
}
if ((counter_x > 0)&&(counter_y>0)){ //step in both axes
if (((out_bits & (1<<X_AXIS)) == 0)^((out_bits & (1<<Y_AXIS)) == 0)){ //X and Y in different directions
WRITE(Y_STEP_PIN, !INVERT_Y_STEP_PIN);
counter_x -= current_block->step_event_count;
WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN);
step_wait();
count_position[X_AXIS]+=count_direction[X_AXIS];
count_position[Y_AXIS]+=count_direction[Y_AXIS];
WRITE(Y_STEP_PIN, !INVERT_Y_STEP_PIN);
counter_y -= current_block->step_event_count;
WRITE(Y_STEP_PIN, INVERT_Y_STEP_PIN);
}
else{ //X and Y in same direction
WRITE(X_STEP_PIN, !INVERT_X_STEP_PIN);
counter_x -= current_block->step_event_count;
WRITE(X_STEP_PIN, INVERT_X_STEP_PIN) ;
step_wait();
count_position[X_AXIS]+=count_direction[X_AXIS];
count_position[Y_AXIS]+=count_direction[Y_AXIS];
WRITE(X_STEP_PIN, !INVERT_X_STEP_PIN);
counter_y -= current_block->step_event_count;
WRITE(X_STEP_PIN, INVERT_X_STEP_PIN);
}
}
#endif //corexy
counter_z += current_block->steps_z;
if (counter_z > 0) {
WRITE(Z_STEP_PIN, !INVERT_Z_STEP_PIN);
#ifdef Z_DUAL_STEPPER_DRIVERS
WRITE(Z2_STEP_PIN, !INVERT_Z_STEP_PIN);
#endif
counter_z -= current_block->step_event_count;
count_position[Z_AXIS]+=count_direction[Z_AXIS];
WRITE(Z_STEP_PIN, INVERT_Z_STEP_PIN);
#ifdef Z_DUAL_STEPPER_DRIVERS
WRITE(Z2_STEP_PIN, INVERT_Z_STEP_PIN);
#endif
}
#ifndef ADVANCE
counter_e += current_block->steps_e;
if (counter_e > 0) {
WRITE_E_STEP(!INVERT_E_STEP_PIN);
counter_e -= current_block->step_event_count;
count_position[E_AXIS]+=count_direction[E_AXIS];
WRITE_E_STEP(INVERT_E_STEP_PIN);
}
#endif //!ADVANCE
step_events_completed += 1;
if(step_events_completed >= current_block->step_event_count) break;
}
// Calculare new timer value
unsigned short timer;
unsigned short step_rate;
if (step_events_completed <= (unsigned long int)current_block->accelerate_until)
{
MultiU24X24toH16(acc_step_rate, acceleration_time, current_block->acceleration_rate);
acc_step_rate += current_block->initial_rate;
// upper limit
if(acc_step_rate > current_block->nominal_rate)
acc_step_rate = current_block->nominal_rate;
// step_rate to timer interval
timer = calc_timer(acc_step_rate);
OCR1A = timer;
acceleration_time += timer;
#ifdef ADVANCE
for(int8_t i=0; i < step_loops; i++) {
advance += advance_rate;
}
//if(advance > current_block->advance) advance = current_block->advance;
// Do E steps + advance steps
e_steps[current_block->active_extruder] += ((advance >>8) - old_advance);
old_advance = advance >>8;
#endif
}
else if (step_events_completed > (unsigned long int)current_block->decelerate_after)
{
MultiU24X24toH16(step_rate, deceleration_time, current_block->acceleration_rate);
if(step_rate > acc_step_rate) { // Check step_rate stays positive
step_rate = current_block->final_rate;
}
else {
step_rate = acc_step_rate - step_rate; // Decelerate from aceleration end point.
}
// lower limit
if(step_rate < current_block->final_rate)
step_rate = current_block->final_rate;
// step_rate to timer interval
timer = calc_timer(step_rate);
OCR1A = timer;
deceleration_time += timer;
#ifdef ADVANCE
for(int8_t i=0; i < step_loops; i++) {
advance -= advance_rate;
}
if(advance < final_advance) advance = final_advance;
// Do E steps + advance steps
e_steps[current_block->active_extruder] += ((advance >>8) - old_advance);
old_advance = advance >>8;
#endif //ADVANCE
}
else
{
OCR1A = OCR1A_nominal;
// ensure we're running at the correct step rate, even if we just came off an acceleration
step_loops = step_loops_nominal;
}
// If current block is finished, reset pointer
if (step_events_completed >= current_block->step_event_count)
{
// disable unloading variable after part3
if (unloading_command && current_block->steps_e == axis_steps_per_unit[E_AXIS] * UNLOADING_PART3_LENGTH) {
unloading_command = false;
}
current_block = NULL;
plan_discard_current_block();
allow_cold_extrudes(false);
}
}
// Minimize gaps in timing to a single step. "... at high step rates, the length of time it takes to
// run the bulk of the interrupt handler is overrunning the compare value (OCR1A) set towards the end of the ISR.
// When this happens, it has to go one through one whole overflow and back again before it triggers the next interrupt.
// Google "OCR1A race condition" for MakerGear post on details. This appears to be a race condition in Marlin firmware
// introduced in a newer compiler version
if (TCNT1 >= OCR1A) TCNT1 = 0;
}
#ifdef ADVANCE
unsigned char old_OCR0A;
// Timer interrupt for E. e_steps is set in the main routine;
// Timer 0 is shared with millies
ISR(TIMER0_COMPA_vect)
{
old_OCR0A += 52; // ~10kHz interrupt (250000 / 26 = 9615kHz)
OCR0A = old_OCR0A;
// Set E direction (Depends on E direction + advance)
for(unsigned char i=0; i<4;i++) {
if (e_steps[0] != 0) {
WRITE(E0_STEP_PIN, INVERT_E_STEP_PIN);
if (e_steps[0] < 0) {
WRITE(E0_DIR_PIN, INVERT_E0_DIR);
e_steps[0]++;
WRITE(E0_STEP_PIN, !INVERT_E_STEP_PIN);
}
else if (e_steps[0] > 0) {
WRITE(E0_DIR_PIN, !INVERT_E0_DIR);
e_steps[0]--;
WRITE(E0_STEP_PIN, !INVERT_E_STEP_PIN);
}
}
#if EXTRUDERS > 1
if (e_steps[1] != 0) {
WRITE(E1_STEP_PIN, INVERT_E_STEP_PIN);
if (e_steps[1] < 0) {
WRITE(E1_DIR_PIN, INVERT_E1_DIR);
e_steps[1]++;
WRITE(E1_STEP_PIN, !INVERT_E_STEP_PIN);
}
else if (e_steps[1] > 0) {
WRITE(E1_DIR_PIN, !INVERT_E1_DIR);
e_steps[1]--;
WRITE(E1_STEP_PIN, !INVERT_E_STEP_PIN);
}
}
#endif
#if EXTRUDERS > 2
if (e_steps[2] != 0) {
WRITE(E2_STEP_PIN, INVERT_E_STEP_PIN);
if (e_steps[2] < 0) {
WRITE(E2_DIR_PIN, INVERT_E2_DIR);
e_steps[2]++;
WRITE(E2_STEP_PIN, !INVERT_E_STEP_PIN);
}
else if (e_steps[2] > 0) {
WRITE(E2_DIR_PIN, !INVERT_E2_DIR);
e_steps[2]--;
WRITE(E2_STEP_PIN, !INVERT_E_STEP_PIN);
}
}
#endif
}
}
#endif // ADVANCE
void st_init()
{
digipot_init(); //Initialize Digipot Motor Current
microstep_init(); //Initialize Microstepping Pins
//Initialize Dir Pins
#if X_DIR_PIN > -1
SET_OUTPUT(X_DIR_PIN);
#endif
#if Y_DIR_PIN > -1
SET_OUTPUT(Y_DIR_PIN);
#endif
#if Z_DIR_PIN > -1
SET_OUTPUT(Z_DIR_PIN);
#if defined(Z_DUAL_STEPPER_DRIVERS) && (Z2_DIR_PIN > -1)
SET_OUTPUT(Z2_DIR_PIN);
#endif
#endif
#if E0_DIR_PIN > -1
SET_OUTPUT(E0_DIR_PIN);
#endif
#if defined(E1_DIR_PIN) && (E1_DIR_PIN > -1)
SET_OUTPUT(E1_DIR_PIN);
#endif
#if defined(E2_DIR_PIN) && (E2_DIR_PIN > -1)
SET_OUTPUT(E2_DIR_PIN);
#endif
//Initialize Enable Pins - steppers default to disabled.
#if (X_ENABLE_PIN > -1)
SET_OUTPUT(X_ENABLE_PIN);
if(!X_ENABLE_ON) WRITE(X_ENABLE_PIN,HIGH);
#endif
#if (Y_ENABLE_PIN > -1)
SET_OUTPUT(Y_ENABLE_PIN);
if(!Y_ENABLE_ON) WRITE(Y_ENABLE_PIN,HIGH);
#endif
#if (Z_ENABLE_PIN > -1)
SET_OUTPUT(Z_ENABLE_PIN);
if(!Z_ENABLE_ON) WRITE(Z_ENABLE_PIN,HIGH);
#if defined(Z_DUAL_STEPPER_DRIVERS) && (Z2_ENABLE_PIN > -1)
SET_OUTPUT(Z2_ENABLE_PIN);
if(!Z_ENABLE_ON) WRITE(Z2_ENABLE_PIN,HIGH);
#endif
#endif
#if (E0_ENABLE_PIN > -1)
SET_OUTPUT(E0_ENABLE_PIN);
if(!E_ENABLE_ON) WRITE(E0_ENABLE_PIN,HIGH);
#endif
#if defined(E1_ENABLE_PIN) && (E1_ENABLE_PIN > -1)
SET_OUTPUT(E1_ENABLE_PIN);
if(!E_ENABLE_ON) WRITE(E1_ENABLE_PIN,HIGH);
#endif
#if defined(E2_ENABLE_PIN) && (E2_ENABLE_PIN > -1)
SET_OUTPUT(E2_ENABLE_PIN);
if(!E_ENABLE_ON) WRITE(E2_ENABLE_PIN,HIGH);
#endif
//endstops and pullups
#if X_MIN_PIN > -1
SET_INPUT(X_MIN_PIN);
#ifdef ENDSTOPPULLUP_XMIN
WRITE(X_MIN_PIN,HIGH);
#endif
#endif
#if Y_MIN_PIN > -1
SET_INPUT(Y_MIN_PIN);
#ifdef ENDSTOPPULLUP_YMIN
WRITE(Y_MIN_PIN,HIGH);
#endif
#endif
#if PRIVATE_ENDSTOPS1 > -1
SET_INPUT(PRIVATE_ENDSTOPS1);
#ifdef ENDSTOPPULLUP_PRIVATE_ENDSTOPS1
WRITE(PRIVATE_ENDSTOPS1,HIGH);
#endif
#endif
#if PRIVATE_ENDSTOPS2 > -1
SET_INPUT(PRIVATE_ENDSTOPS2);
#ifdef ENDSTOPPULLUP_PRIVATE_ENDSTOPS2
WRITE(PRIVATE_ENDSTOPS2,HIGH);
#endif
#endif
#if Z_MIN_PIN > -1
SET_INPUT(Z_MIN_PIN);
#ifdef ENDSTOPPULLUP_ZMIN
WRITE(Z_MIN_PIN,HIGH);
#endif
#endif
#if X_MAX_PIN > -1
SET_INPUT(X_MAX_PIN);
#ifdef ENDSTOPPULLUP_XMAX
WRITE(X_MAX_PIN,HIGH);
#endif
#endif
#if Y_MAX_PIN > -1
SET_INPUT(Y_MAX_PIN);
#ifdef ENDSTOPPULLUP_YMAX
WRITE(Y_MAX_PIN,HIGH);
#endif
#endif
#if Z_MAX_PIN > -1
SET_INPUT(Z_MAX_PIN);
#ifdef ENDSTOPPULLUP_ZMAX
WRITE(Z_MAX_PIN,HIGH);
#endif
#endif
//Initialize Step Pins
#if (X_STEP_PIN > -1)
SET_OUTPUT(X_STEP_PIN);
WRITE(X_STEP_PIN,INVERT_X_STEP_PIN);
disable_x();
#endif
#if (Y_STEP_PIN > -1)
SET_OUTPUT(Y_STEP_PIN);
WRITE(Y_STEP_PIN,INVERT_Y_STEP_PIN);
disable_y();
#endif
#if (Z_STEP_PIN > -1)
SET_OUTPUT(Z_STEP_PIN);
WRITE(Z_STEP_PIN,INVERT_Z_STEP_PIN);
#if defined(Z_DUAL_STEPPER_DRIVERS) && (Z2_STEP_PIN > -1)
SET_OUTPUT(Z2_STEP_PIN);
WRITE(Z2_STEP_PIN,INVERT_Z_STEP_PIN);
#endif
disable_z();
#endif
#if (E0_STEP_PIN > -1)
SET_OUTPUT(E0_STEP_PIN);
WRITE(E0_STEP_PIN,INVERT_E_STEP_PIN);
disable_e0();
#endif
#if defined(E1_STEP_PIN) && (E1_STEP_PIN > -1)
SET_OUTPUT(E1_STEP_PIN);
WRITE(E1_STEP_PIN,INVERT_E_STEP_PIN);
disable_e1();
#endif
#if defined(E2_STEP_PIN) && (E2_STEP_PIN > -1)
SET_OUTPUT(E2_STEP_PIN);
WRITE(E2_STEP_PIN,INVERT_E_STEP_PIN);
disable_e2();
#endif