#include "timer.h"
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/timer.h>

void timer_setup(void) {
    rcc_periph_clock_enable(RCC_TIM2);
    timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
    timer_set_oc_mode(TIM2, TIM_OC1, TIM_OCM_PWM1);
    timer_enable_counter(TIM2);
    timer_enable_oc_output(TIM2, TIM_OC1);

    timer_set_prescaler(TIM2, PRESCALER - 1);
    timer_set_period(TIM2, ARR_VAL - 1);
}

void timer_pwm_set_duty(float duty) {
    const float raw = (float)ARR_VAL * (duty / 100.0f);
    timer_set_oc_value(TIM2, TIM_OC1, (uint32_t)raw);
}