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muele-marlin/Marlin/stepper.cpp
Erik van der Zalm f75f426dfa Removed interrupt nesting in the stepper ISR. 
Add serial checkRx in stepper ISR.
Copied HardwareSerial to MarlinSerial (Needed for checkRx).
2011-11-27 21:12:55 +01:00

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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 "stepper.h"
#include "Configuration.h"
#include "Marlin.h"
#include "planner.h"
#include "pins.h"
#include "fastio.h"
#include "temperature.h"
#include "ultralcd.h"
#include "speed_lookuptable.h"
//===========================================================================
//=============================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 short old_advance = 0;
#endif
static short e_steps;
static unsigned char busy = false; // TRUE when SIG_OUTPUT_COMPARE1A is being serviced. Used to avoid retriggering that handler.
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;
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 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;
volatile long count_position[NUM_AXIS] = { 0, 0, 0, 0};
volatile char count_direction[NUM_AXIS] = { 1, 1, 1, 1};
//===========================================================================
//=============================functions ============================
//===========================================================================
// 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) {
SERIAL_ECHO_START;
SERIAL_ECHOPGM("endstops hit: ");
if(endstop_x_hit) {
SERIAL_ECHOPAIR(" X:",(float)endstops_trigsteps[X_AXIS]/axis_steps_per_unit[X_AXIS]);
}
if(endstop_y_hit) {
SERIAL_ECHOPAIR(" Y:",(float)endstops_trigsteps[Y_AXIS]/axis_steps_per_unit[Y_AXIS]);
}
if(endstop_z_hit) {
SERIAL_ECHOPAIR(" Z:",(float)endstops_trigsteps[Z_AXIS]/axis_steps_per_unit[Z_AXIS]);
}
SERIAL_ECHOLN("");
endstop_x_hit=false;
endstop_y_hit=false;
endstop_z_hit=false;
}
}
void endstops_hit_on_purpose()
{
endstop_x_hit=false;
endstop_y_hit=false;
endstop_z_hit=false;
}
// __________________________
// /| |\ _________________ ^
// / | | \ /| |\ |
// / | | \ / | | \ 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;
if(busy == false)
ENABLE_STEPPER_DRIVER_INTERRUPT();
}
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 < 32) step_rate = 32;
step_rate -= 32; // 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; MSerial.print("Steprate to high : "); MSerial.println(step_rate); }//(20kHz this should never happen)
return timer;
}
// Initializes the trapezoid generator from the current block. Called whenever a new
// block begins.
inline void trapezoid_generator_reset() {
#ifdef ADVANCE
advance = current_block->initial_advance;
final_advance = current_block->final_advance;
#endif
deceleration_time = 0;
// step_rate to timer interval
acc_step_rate = current_block->initial_rate;
acceleration_time = calc_timer(acc_step_rate);
OCR1A = acceleration_time;
OCR1A_nominal = calc_timer(current_block->nominal_rate);
}
// "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) {
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 ADVANCE
e_steps = 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) { // -direction
WRITE(X_DIR_PIN, INVERT_X_DIR);
count_direction[X_AXIS]=-1;
#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
WRITE(X_DIR_PIN,!INVERT_X_DIR);
count_direction[X_AXIS]=1;
#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
WRITE(Y_DIR_PIN,INVERT_Y_DIR);
count_direction[Y_AXIS]=-1;
#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
WRITE(Y_DIR_PIN,!INVERT_Y_DIR);
count_direction[Y_AXIS]=1;
#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
}
if ((out_bits & (1<<Z_AXIS)) != 0) { // -direction
WRITE(Z_DIR_PIN,INVERT_Z_DIR);
count_direction[Z_AXIS]=-1;
#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);
count_direction[Z_AXIS]=1;
#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
WRITE(E_DIR_PIN,INVERT_E_DIR);
count_direction[E_AXIS]=-1;
}
else { // +direction
WRITE(E_DIR_PIN,!INVERT_E_DIR);
count_direction[E_AXIS]=-1;
}
#endif //!ADVANCE
for(int8_t i=0; i < step_loops; i++) { // Take multiple steps per interrupt (For high speed moves)
MSerial.checkRx();
/*
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
CRITICAL_SECTION_START;
e_steps--;
CRITICAL_SECTION_END;
}
else {
CRITICAL_SECTION_START;
e_steps++;
CRITICAL_SECTION_END;
}
}
*/
/*
// Do E steps + advance steps
CRITICAL_SECTION_START;
e_steps += ((advance >> 16) - old_advance);
CRITICAL_SECTION_END;
old_advance = advance >> 16;
*/
counter_x += current_block->steps_x;
if (counter_x > 0) {
WRITE(X_STEP_PIN, HIGH);
counter_x -= current_block->step_event_count;
WRITE(X_STEP_PIN, LOW);
count_position[X_AXIS]+=count_direction[X_AXIS];
}
counter_y += current_block->steps_y;
if (counter_y > 0) {
WRITE(Y_STEP_PIN, HIGH);
counter_y -= current_block->step_event_count;
WRITE(Y_STEP_PIN, LOW);
count_position[Y_AXIS]+=count_direction[Y_AXIS];
}
counter_z += current_block->steps_z;
if (counter_z > 0) {
WRITE(Z_STEP_PIN, HIGH);
counter_z -= current_block->step_event_count;
WRITE(Z_STEP_PIN, LOW);
count_position[Z_AXIS]+=count_direction[Z_AXIS];
}
#ifndef ADVANCE
counter_e += current_block->steps_e;
if (counter_e > 0) {
WRITE(E_STEP_PIN, HIGH);
counter_e -= current_block->step_event_count;
WRITE(E_STEP_PIN, LOW);
count_position[E_AXIS]+=count_direction[E_AXIS];
}
#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 <= 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
advance += advance_rate;
#endif
}
else if (step_events_completed > 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
advance -= advance_rate;
if(advance < final_advance)
advance = final_advance;
#endif //ADVANCE
}
else {
OCR1A = OCR1A_nominal;
}
// If current block is finished, reset pointer
if (step_events_completed >= current_block->step_event_count) {
current_block = NULL;
plan_discard_current_block();
}
}
}
#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)
{
// Critical section needed because Timer 1 interrupt has higher priority.
// The pin set functions are placed on trategic position to comply with the stepper driver timing.
WRITE(E_STEP_PIN, LOW);
// Set E direction (Depends on E direction + advance)
if (e_steps < 0) {
WRITE(E_DIR_PIN,INVERT_E_DIR);
e_steps++;
WRITE(E_STEP_PIN, HIGH);
}
if (e_steps > 0) {
WRITE(E_DIR_PIN,!INVERT_E_DIR);
e_steps--;
WRITE(E_STEP_PIN, HIGH);
}
old_OCR0A += 25; // 10kHz interrupt
OCR0A = old_OCR0A;
}
#endif // ADVANCE
void st_init()
{
//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);
#endif
#if E_DIR_PIN > -1
SET_OUTPUT(E_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);
#endif
#if (E_ENABLE_PIN > -1)
SET_OUTPUT(E_ENABLE_PIN);
if(!E_ENABLE_ON) WRITE(E_ENABLE_PIN,HIGH);
#endif
//endstops and pullups
#ifdef ENDSTOPPULLUPS
#if X_MIN_PIN > -1
SET_INPUT(X_MIN_PIN);
WRITE(X_MIN_PIN,HIGH);
#endif
#if X_MAX_PIN > -1
SET_INPUT(X_MAX_PIN);
WRITE(X_MAX_PIN,HIGH);
#endif
#if Y_MIN_PIN > -1
SET_INPUT(Y_MIN_PIN);
WRITE(Y_MIN_PIN,HIGH);
#endif
#if Y_MAX_PIN > -1
SET_INPUT(Y_MAX_PIN);
WRITE(Y_MAX_PIN,HIGH);
#endif
#if Z_MIN_PIN > -1
SET_INPUT(Z_MIN_PIN);
WRITE(Z_MIN_PIN,HIGH);
#endif
#if Z_MAX_PIN > -1
SET_INPUT(Z_MAX_PIN);
WRITE(Z_MAX_PIN,HIGH);
#endif
#else //ENDSTOPPULLUPS
#if X_MIN_PIN > -1
SET_INPUT(X_MIN_PIN);
#endif
#if X_MAX_PIN > -1
SET_INPUT(X_MAX_PIN);
#endif
#if Y_MIN_PIN > -1
SET_INPUT(Y_MIN_PIN);
#endif
#if Y_MAX_PIN > -1
SET_INPUT(Y_MAX_PIN);
#endif
#if Z_MIN_PIN > -1
SET_INPUT(Z_MIN_PIN);
#endif
#if Z_MAX_PIN > -1
SET_INPUT(Z_MAX_PIN);
#endif
#endif //ENDSTOPPULLUPS
//Initialize Step Pins
#if (X_STEP_PIN > -1)
SET_OUTPUT(X_STEP_PIN);
#endif
#if (Y_STEP_PIN > -1)
SET_OUTPUT(Y_STEP_PIN);
#endif
#if (Z_STEP_PIN > -1)
SET_OUTPUT(Z_STEP_PIN);
#endif
#if (E_STEP_PIN > -1)
SET_OUTPUT(E_STEP_PIN);
#endif
// waveform generation = 0100 = CTC
TCCR1B &= ~(1<<WGM13);
TCCR1B |= (1<<WGM12);
TCCR1A &= ~(1<<WGM11);
TCCR1A &= ~(1<<WGM10);
// output mode = 00 (disconnected)
TCCR1A &= ~(3<<COM1A0);
TCCR1A &= ~(3<<COM1B0);
TCCR1B = (TCCR1B & ~(0x07<<CS10)) | (2<<CS10); // 2MHz timer
OCR1A = 0x4000;
TCNT1 = 0;
ENABLE_STEPPER_DRIVER_INTERRUPT();
#ifdef ADVANCE
e_steps = 0;
TIMSK0 |= (1<<OCIE0A);
#endif //ADVANCE
sei();
}
// Block until all buffered steps are executed
void st_synchronize()
{
while(plan_get_current_block()) {
manage_heater();
manage_inactivity(1);
LCD_STATUS;
}
}
void st_set_position(const long &x, const long &y, const long &z, const long &e)
{
CRITICAL_SECTION_START;
count_position[X_AXIS] = x;
count_position[Y_AXIS] = y;
count_position[Z_AXIS] = z;
count_position[E_AXIS] = e;
CRITICAL_SECTION_END;
}
void st_set_e_position(const long &e)
{
CRITICAL_SECTION_START;
count_position[E_AXIS] = e;
CRITICAL_SECTION_END;
}
long st_get_position(char axis)
{
long count_pos;
CRITICAL_SECTION_START;
count_pos = count_position[axis];
CRITICAL_SECTION_END;
return count_pos;
}
void finishAndDisableSteppers()
{
st_synchronize();
LCD_MESSAGEPGM("Released.");
disable_x();
disable_y();
disable_z();
disable_e();
}
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