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234 lines
7.0 KiB
C
234 lines
7.0 KiB
C
/*
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* geany_encoding=koi8-r
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* stepper.c
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*
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* Copyright 2017 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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#include "includes.h"
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/*
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* Half-step mode:
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* D |----|----| | | | | |----|
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* D | | |----|----|----|----|----| |
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* C | |----|----|----| | | | |
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* C |----| | | |----|----|----|----|
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* B | | | |----|----|----| | |
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* B |----|----|----| | | |----|----|
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* A | | | | | |----|----|----|
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* A |----|----|----|----|----| | | |
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*
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* In full-step mode pulse rises sequentally: D->C->B->A
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* 0 0000
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* 1 0001
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* 2 0010
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* 3 0011
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* 4 0100
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* 5 0101
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* 6 0110
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* 7 0111
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* 8 1000
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* 9 1001
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*10 1010
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*11 1011
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*12 1100
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*13 1101
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*14 1110
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*15 1111
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*/
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// winding1: [13], winding2: [24]
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// microsteps: [1234] = 1000, 1100, 0100, 0110, 0010, 0011, 0001, 1001 -- for ULN
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// [1324] = 1000, 1010, 0010, 0110, 0100, 0101, 0001, 1001 - bipolar
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// 1000, 1010, 0010, 0110, 0100, 0101, 0001, 1001 - half-step
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// 1010, 0110, 0101, 1001 - full step
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//static const uint8_t usteps[8] = {8, 12, 4, 6, 2, 3, 1, 9}; // ULN - unipolar, active 1
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//static const uint8_t usteps[8] = {7, 3, 11, 9, 13, 12, 14, 6}; // unipolar, active is 0
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static const uint8_t usteps_matrix[8][8] = {
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{0b1000, 0b1100, 0b0100, 0b0110, 0b0010, 0b0011, 0b0001, 0b1001}, // [1234]
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{0b0010, 0b0110, 0b0100, 0b1100, 0b1000, 0b1001, 0b0001, 0b0011}, // [3214]
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{0b1000, 0b1001, 0b0001, 0b0011, 0b0010, 0b0110, 0b0100, 0b1100}, // [1432]
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{0b1000, 0b1010, 0b0010, 0b0110, 0b0100, 0b0101, 0b0001, 0b1001}, // [1324]
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// inversion: cat | sed -e 's/0b/x/g' -e 's/0/y/g' -e 's/1/0/g' -e 's/y/1/g' -e s'/x/0b/g'
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{0b0111, 0b0011, 0b1011, 0b1001, 0b1101, 0b1100, 0b1110, 0b0110}, // [1234]
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{0b1101, 0b1001, 0b1011, 0b0011, 0b0111, 0b0110, 0b1110, 0b1100}, // [3214]
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{0b0111, 0b0110, 0b1110, 0b1100, 0b1101, 0b1001, 0b1011, 0b0011}, // [1432]
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{0b0111, 0b0101, 0b1101, 0b1001, 0b1011, 0b1010, 0b1110, 0b0110}, // [1324]
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};
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uint8_t const *usteps = usteps_matrix[0];
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static int8_t Ustep = 0; // current microstep count
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uint16_t Steps_left; // steps left to proceed (absolute value)
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static uint8_t direction = 0; // ==1 if rotate CCW
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static uint8_t cur_motor = 0; // current motor number
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volatile uint8_t stepper_pulse = 0; // interrupt flag, used in main.c
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void stepper_setup(){
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TCCR1B |= _BV(WGM12); // configure timer1 for CTC mode, TOP is OCR1A
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OCR1A = 2000; // set the CTC compare value - 1kHz
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TCCR1B |= _BV(CS11); // start the timer at 16MHz/8 = 2MHz
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//TCCR1B |= _BV(CS12) | _BV(CS10); // /1024 == 15625Hz
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//OCR1A = 15625;
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TIMSK1 |= _BV(OCIE1A); // enable the CTC interrupt
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PORTC |= _BV(4) | _BV(5); // enable pullup
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}
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/**
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* Change TIM1 speed
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* Period = 4 * 65535/(spd + 10) microseconds
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*/
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uint8_t stepper_ch_speed(char *spd){
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int16_t newval;
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if(readInt(spd, &newval)){
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if(newval > -9 && newval < 0x7fff){
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uint16_t O = 0xffff / (newval + 10);
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TIMSK1 &= ~_BV(OCIE1A); // disable timer interrupt
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OCR1A = O;
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TCNT1 = 0; // reset counter
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TIMSK1 |= _BV(OCIE1A);
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#ifdef EBUG
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usart_send("Speed changed to ");
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printUint((uint8_t*)&O, 2);
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usart_send("\n");
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#endif
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}else DBG("Bad speed value\n");
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}
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return 0;
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}
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/**
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* Check endswitches
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* @return 0 if none pressed, 1 if "-", 2 if "+"
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*/
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static uint8_t check_endsw(){
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// PC4 - "-", PC5 - "+"
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uint8_t pc = PINC;
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if(0 == (pc & _BV(4))) return 1;
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if(0 == (pc & _BV(5))) return 2;
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return 0;
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}
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/**
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* move stepper number Nmotor by Nsteps steps
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* @return 1 if all OK, 0 if error occured
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*/
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uint8_t stepper_move(uint8_t Nmotor, int16_t Nsteps){
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if(!Nmotor || Nmotor > 6 || !Nsteps || Steps_left) return 0;
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TIMSK1 &= ~_BV(OCIE1A); // disable timer interrupt
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// turn all OFF
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STPRS_OFF();
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// turn on the motor we need
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PORTD &= ~(2 << Nmotor);
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uint8_t c = check_endsw();
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cur_motor = Nmotor;
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if(c){
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if(c == 1){if(Nsteps > 0) c = 0;}
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else if(Nsteps < 0) c = 0;
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}
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if(c){
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stop_motors();
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return 0; // already at end-switch in given direction
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}
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if(Nsteps < 0){ // CCW
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Nsteps = -Nsteps;
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direction = 1;
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}else direction = 0; // CW
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Steps_left = Nsteps;
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TCNT1 = 0; // reset counter
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TIMSK1 |= _BV(OCIE1A);
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return 1;
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}
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void stop_motors(){
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stepper_get_esw(cur_motor);
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// turn off all pulses to place motor in free state & prevent undesirable behaviour
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STPRS_OFF();
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TIMSK1 &= ~_BV(OCIE1A); // disable timer interrupt
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stepper_pulse = 0;
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Steps_left = 0;
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Ustep = 0;
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cur_motor = 0;
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}
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/**
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* process stepper pulses generation @ timer event
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*/
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void stepper_process(){
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stepper_pulse = 0;
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uint8_t port = PORTC & 0xf0; // save old port state & clear clocking
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PORTC = port | usteps[Ustep];
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uint8_t sw = check_endsw(); // 1 - "-", 2 - "+", 0 - none
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if(direction){ // CCW
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if(--Ustep < 0){
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Ustep = 7;
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--Steps_left;
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}
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if(sw == 1){
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stop_motors();
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return;
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}
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}else{ // CW
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if(++Ustep > 7){
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Ustep = 0;
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--Steps_left;
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}
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if(sw == 2){
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stop_motors();
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return;
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}
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}
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if(Steps_left == 0) stop_motors();
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}
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/**
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* get end-switches state for all motors or only Nth
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* @param Nmotor - number of given motor
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*/
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void stepper_get_esw(uint8_t Nmotor){
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if(Nmotor == 0 || Nmotor > 7) return; // no running motor
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PORTD |= 0xfc;
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PORTD &= ~(2 << Nmotor); // [2 1 St=2]
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char str[] = "[2 0 St=0]\n"; // 3 - motor number, 5 - endswitch (3 if none)
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str[3] = Nmotor + '0';
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uint8_t sw = check_endsw();
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if(sw == 0) sw = 3;
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str[8] = sw + '0';
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usart_send(str);
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}
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/**
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* User can change current stepper phases table
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* N - position in table from 'a' (0) to 'h' (7)
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* return 1 if all OK
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*/
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uint8_t chk_stpr_cmd(char N){
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if(N < 'a' || N > 'h') return 0;
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usteps = usteps_matrix[N-'a'];
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return 1;
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}
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/**
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* Timer 1 used to generate stepper pulses
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*/
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ISR(TIMER1_COMPA_vect){
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stepper_pulse = 1; // say that we can generate next microstep
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}
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