/* simu.host.c */ /* asserv - Position & speed motor control on AVR. {{{ * * Copyright (C) 2006 Nicolas Schodet * * APBTeam: * Web: http://apbteam.org/ * Email: team AT apbteam DOT org * * This program 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 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * }}} */ #include "common.h" #include "simu.host.h" #include "modules/host/host.h" #include "modules/utils/utils.h" #include #include #include #include "pwm.h" #include "motor_model.host.h" #include "models.host.h" /** Simulate some AVR regs. */ uint8_t DDRF, PORTC, PORTD, PORTE, PORTF, PORTG, PINC; /** Overall counter values. */ uint16_t counter_left, counter_right, counter_aux0; /** Counter differences since last update. * Maximum of 7 significant bits, sign included. */ int16_t counter_left_diff, counter_right_diff, counter_aux0_diff; /** PWM values, this is an error if absolute value is greater than the * maximum. */ int16_t pwm_left, pwm_right, pwm_aux0; /** PWM reverse directions. */ uint8_t pwm_reverse; /** Motor models. */ struct motor_t simu_left_model, simu_right_model, simu_aux0_model; /** Is there an auxiliary motor? */ int simu_aux0; /** Computed simulated position (mm). */ double simu_pos_x, simu_pos_y, simu_pos_a; /** Distance between wheels. */ double simu_footing; /** Initialise simulation. */ static void simu_init (void) { int argc; char **argv; const struct robot_t *m; host_get_program_arguments (&argc, &argv); if (argc != 1) { fprintf (stderr, "need model name as first argument\n"); exit (1); } m = models_get (argv[0]); if (!m) { fprintf (stderr, "unknown model name: %s\n", argv[0]); exit (1); } simu_left_model = *m->motor; simu_right_model = *m->motor; simu_aux0 = !!m->aux0; if (simu_aux0) simu_aux0_model = *m->aux0; simu_footing = m->footing; simu_pos_x = simu_pos_y = simu_pos_a = 0; } /** Update simulation position. */ static void simu_pos_update (double dl, double dr) { double d = 0.5 * (dl + dr); double da = (dr - dl) / simu_footing; double na = simu_pos_a + da; if (da < 0.0001 && da > -0.0001) { /* Avoid a division by zero when angle is too small. */ double a = simu_pos_a + da * 0.5; simu_pos_x += d * cos (a); simu_pos_y += d * sin (a); } else { /* Radius of turn is d / da. */ simu_pos_x += (sin (na) - sin (simu_pos_a)) * d / da; simu_pos_y += (cos (simu_pos_a) - cos (na)) * d / da; } simu_pos_a = na; } /** Do a simulation step. */ static void simu_step (void) { double old_left_th, old_right_th, old_aux0_th; /* Convert pwm value into voltage. */ assert (pwm_left >= -PWM_MAX && pwm_left <= PWM_MAX); assert (pwm_right >= -PWM_MAX && pwm_right <= PWM_MAX); assert (pwm_aux0 >= -PWM_MAX && pwm_aux0 <= PWM_MAX); simu_left_model.u = (double) (pwm_left + 1) / (PWM_MAX + 1); simu_right_model.u = (double) (pwm_right + 1) / (PWM_MAX + 1); simu_aux0_model.u = (double) (pwm_aux0 + 1) / (PWM_MAX + 1); /* Make one step. */ old_left_th = simu_left_model.th; old_right_th = simu_right_model.th; old_aux0_th = simu_aux0_model.th; motor_model_step (&simu_left_model); motor_model_step (&simu_right_model); if (simu_aux0) motor_model_step (&simu_aux0_model); /* Modify counters. */ counter_left_diff = (simu_left_model.th - old_left_th) / (2*M_PI) * 500 * simu_left_model.i_G; counter_left += counter_left_diff; counter_right_diff = (simu_right_model.th - old_right_th) / (2*M_PI) * 500 * simu_right_model.i_G; counter_right += counter_right_diff; if (simu_aux0) { counter_aux0_diff = (simu_aux0_model.th - old_aux0_th) / (2*M_PI) * 500 * simu_aux0_model.i_G; counter_aux0 += counter_aux0_diff; } /* Update position */ simu_pos_update ((simu_left_model.th - old_left_th) * simu_left_model.i_G * simu_left_model.w_r * 1000, (simu_right_model.th - old_right_th) * simu_right_model.i_G * simu_right_model.w_r * 1000); } /** Initialise the timer. */ void timer_init (void) { simu_init (); } /** Wait for timer overflow. */ void timer_wait (void) { simu_step (); } /** Read timer value. Used for performance analysis. */ uint8_t timer_read (void) { return 0; } /** Initialize the counters. */ void counter_init (void) { } /** Update overall counter values and compute diffs. */ void counter_update (void) { } /** Initialise PWM generator. */ void pwm_init (void) { } /** Update the hardware PWM values. */ void pwm_update (void) { } void eeprom_read_params (void) { } void eeprom_write_params (void) { } void eeprom_clear_params (void) { } void pwm_set_reverse (uint8_t reverse) { pwm_reverse = reverse; }