147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
#include "motor.hpp"
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#include "pwm.hpp"
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namespace motor {
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Motor::Motor(const pin_pair &pins, float freq, DecayMode mode)
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: pins(pins), pwm_frequency(freq), motor_decay_mode(mode) {
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}
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Motor::~Motor() {
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gpio_set_function(pins.positive, GPIO_FUNC_NULL);
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gpio_set_function(pins.negative, GPIO_FUNC_NULL);
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}
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bool Motor::init() {
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bool success = false;
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uint16_t period; uint16_t div16;
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if(pimoroni::calculate_pwm_factors(pwm_frequency, period, div16)) {
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pwm_period = period;
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pwm_cfg = pwm_get_default_config();
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//Set the new wrap (should be 1 less than the period to get full 0 to 100%)
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pwm_config_set_wrap(&pwm_cfg, period - 1);
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//Apply the divider
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pwm_config_set_clkdiv(&pwm_cfg, (float)div16 / 16.0f);
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pwm_init(pwm_gpio_to_slice_num(pins.positive), &pwm_cfg, true);
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gpio_set_function(pins.positive, GPIO_FUNC_PWM);
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pwm_init(pwm_gpio_to_slice_num(pins.negative), &pwm_cfg, true);
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gpio_set_function(pins.negative, GPIO_FUNC_PWM);
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update_pwm();
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success = true;
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}
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return success;
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}
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float Motor::get_speed() {
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return motor_speed;
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}
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void Motor::set_speed(float speed) {
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motor_speed = MIN(MAX(speed, -1.0f), 1.0f);
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update_pwm();
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}
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float Motor::get_frequency() {
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return pwm_frequency;
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}
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bool Motor::set_frequency(float freq) {
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bool success = false;
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//Calculate a suitable pwm wrap period for this frequency
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uint16_t period; uint16_t div16;
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if(pimoroni::calculate_pwm_factors(freq, period, div16)) {
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//Record if the new period will be larger or smaller.
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//This is used to apply new pwm values either before or after the wrap is applied,
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//to avoid momentary blips in PWM output on SLOW_DECAY
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bool pre_update_pwm = (period > pwm_period);
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pwm_period = period;
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pwm_frequency = freq;
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uint pos_num = pwm_gpio_to_slice_num(pins.positive);
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uint neg_num = pwm_gpio_to_slice_num(pins.negative);
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//Apply the new divider
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uint8_t div = div16 >> 4;
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uint8_t mod = div16 % 16;
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pwm_set_clkdiv_int_frac(pos_num, div, mod);
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if(neg_num != pos_num) {
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pwm_set_clkdiv_int_frac(neg_num, div, mod);
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}
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//If the the period is larger, update the pwm before setting the new wraps
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if(pre_update_pwm)
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update_pwm();
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//Set the new wrap (should be 1 less than the period to get full 0 to 100%)
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pwm_set_wrap(pos_num, pwm_period - 1);
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if(neg_num != pos_num) {
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pwm_set_wrap(neg_num, pwm_period - 1);
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}
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//If the the period is smaller, update the pwm after setting the new wraps
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if(!pre_update_pwm)
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update_pwm();
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success = true;
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}
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return success;
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}
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Motor::DecayMode Motor::get_decay_mode() {
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return motor_decay_mode;
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}
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void Motor::set_decay_mode(Motor::DecayMode mode) {
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motor_decay_mode = mode;
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update_pwm();
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}
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void Motor::stop() {
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motor_speed = 0.0f;
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update_pwm();
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}
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void Motor::disable() {
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motor_speed = 0.0f;
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pwm_set_gpio_level(pins.positive, 0);
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pwm_set_gpio_level(pins.negative, 0);
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}
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void Motor::update_pwm() {
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int32_t signed_duty_cycle = (int32_t)(motor_speed * (float)pwm_period);
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switch(motor_decay_mode) {
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case SLOW_DECAY: //aka 'Braking'
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if(signed_duty_cycle >= 0) {
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pwm_set_gpio_level(pins.positive, pwm_period);
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pwm_set_gpio_level(pins.negative, pwm_period - signed_duty_cycle);
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}
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else {
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pwm_set_gpio_level(pins.positive, pwm_period + signed_duty_cycle);
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pwm_set_gpio_level(pins.negative, pwm_period);
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}
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break;
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case FAST_DECAY: //aka 'Coasting'
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default:
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if(signed_duty_cycle >= 0) {
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pwm_set_gpio_level(pins.positive, signed_duty_cycle);
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pwm_set_gpio_level(pins.negative, 0);
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}
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else {
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pwm_set_gpio_level(pins.positive, 0);
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pwm_set_gpio_level(pins.negative, 0 - signed_duty_cycle);
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}
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break;
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}
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}
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}; |