83 lines
2.5 KiB
C
83 lines
2.5 KiB
C
/*
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* @file motor_init.h
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* @brief define the constants and initialize the motor
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* @author Richie
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*/
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#ifndef MOTOR_INIT_H
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#define MOTOR_INIT_H
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#include <stdio.h>
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#include "pico/cyw43_arch.h"
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#include "pico/stdlib.h"
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#include "hardware/pwm.h"
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#include "FreeRTOS.h"
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#include "task.h"
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#include "semphr.h"
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#include "motor_config.h"
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motor_t g_motor_left = { .pwm.level = 0u,
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.pwm.channel = PWM_CHAN_A,
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.speed.distance_cm = 0.0f };
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// classic ziegler nichols method
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// Ku = 1000, Tu = 0.9s, interval = 0.05s
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// Kp = 0.6 * Ku = 600
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// Ki = 2 * Kp * 0.05 / Tu = 66.67
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// Kd = Kp * Tu * 0.05 / 8 = 1350
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motor_t g_motor_right = { .pwm.level = 0u,
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.pwm.channel = PWM_CHAN_B,
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.speed.distance_cm = 0.0f,
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.pid.kp_value = 600.f,
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.pid.ki_value = 66.67f,
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.pid.kd_value = 1350.f,};
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void
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motor_init(void)
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{
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// Semaphore
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g_motor_left.sem = xSemaphoreCreateBinary();
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g_motor_right.sem = xSemaphoreCreateBinary();
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gpio_init(SPEED_PIN_RIGHT);
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gpio_init(SPEED_PIN_LEFT);
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gpio_set_dir(SPEED_PIN_RIGHT, GPIO_IN);
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gpio_set_dir(SPEED_PIN_LEFT, GPIO_IN);
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// Initialize direction pins as outputs
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gpio_init(DIRECTION_PIN_RIGHT_IN1);
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gpio_init(DIRECTION_PIN_RIGHT_IN2);
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gpio_init(DIRECTION_PIN_LEFT_IN3);
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gpio_init(DIRECTION_PIN_LEFT_IN4);
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gpio_set_dir(DIRECTION_PIN_RIGHT_IN1, GPIO_OUT);
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gpio_set_dir(DIRECTION_PIN_RIGHT_IN2, GPIO_OUT);
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gpio_set_dir(DIRECTION_PIN_LEFT_IN3, GPIO_OUT);
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gpio_set_dir(DIRECTION_PIN_LEFT_IN4, GPIO_OUT);
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// Initialise PWM
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gpio_set_function(PWM_PIN_LEFT, GPIO_FUNC_PWM);
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gpio_set_function(PWM_PIN_RIGHT, GPIO_FUNC_PWM);
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g_motor_left.pwm.slice_num = pwm_gpio_to_slice_num(PWM_PIN_LEFT);
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g_motor_right.pwm.slice_num = pwm_gpio_to_slice_num(PWM_PIN_RIGHT);
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// NOTE: PWM clock is 125MHz for raspberrypi pico w by default
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// 125MHz / 50 = 2500kHz
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pwm_set_clkdiv(g_motor_left.pwm.slice_num, PWM_CLK_DIV);
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pwm_set_clkdiv(g_motor_right.pwm.slice_num, PWM_CLK_DIV);
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// L289N can accept up to 40kHz
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// 2500kHz / 100 = 25kHz
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pwm_set_wrap(g_motor_left.pwm.slice_num, (PWM_WRAP - 1U));
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pwm_set_wrap(g_motor_right.pwm.slice_num, (PWM_WRAP - 1U));
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pwm_set_enabled(g_motor_left.pwm.slice_num, true);
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pwm_set_enabled(g_motor_right.pwm.slice_num, true);
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}
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#endif /* MOTOR_INIT_H */ |