/**
 ******************************************************************************
 * @file           : main.c
 * @author         : Auto-generated by STM32CubeIDE
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2026 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */




#include <stdint.h>
#include "stm32f103xb.h"
#include "stm32f103_hal.h"


void delay_ms(uint16_t ms) {
	volatile unsigned long t = 0;
	for(uint16_t i = 0; i < ms; i++)
	{
		for(t = 0; t < 800; t++);
	}
}

void delay_us(uint16_t us)
{
	for (volatile unsigned int cycles = 0; cycles < us; cycles++);
}

volatile uint16_t firing_delay = 1000;
volatile uint8_t triac_on = 1;
int main(void)
{
	// RCC config
	rcc_clock_enable(RCC_GPIOA); // Activo clock de GPIOA
	rcc_clock_enable(RCC_TIM3); // Activo clock de TIM3
	rcc_clock_enable(RCC_AFIO); // Activo clock de AFIO (EXTI)

	// GPIO config
	gpio_set_output(GPIOA, GPIO_PIN_1, GPIO_OUTPUT_PP, GPIO_SPEED_2MHZ);
	gpio_set_input(GPIOA, GPIO_PIN_2, GPIO_INPUT_PD);
	gpio_set_input(GPIOA, GPIO_PIN_3, GPIO_INPUT_PD);

	// TIMER config
	timer_init(TIM3, TIMER_MODE_UP, 1000, 7);
	timer_set_interrupt(TIM3, TIMER_IRQ_UPDATE, IRQ_ENABLE);
	NVIC_EnableIRQ(TIM3_IRQn);

	// EXTI config
	exti_set_interrupt(PA0, EXTI_IRQ_RISING);
	NVIC_EnableIRQ(EXTI0_IRQn);


	// Loop
	while (1)
	{
		if( gpio_read_pin(GPIOA, GPIO_PIN_3) )
		{
			triac_on=1;
			if(firing_delay>1000) firing_delay -= 1000;

			delay_ms(10);
			while(gpio_read_pin(GPIOA, GPIO_PIN_3));
			delay_ms(10);
		}

		if( gpio_read_pin(GPIOA, GPIO_PIN_2) )
		{
			if(firing_delay<9000) firing_delay += 1000;
			else
			{
				triac_on=0;
				firing_delay=10000;
			}

			delay_ms(10);
			while(gpio_read_pin(GPIOA, GPIO_PIN_2));
			delay_ms(10);
		}
	}
}

void EXTI0_IRQHandler(void)
{
	// Clear pending flag
	EXTI->PR = 1 << 0;

	// Launch timer
	if(triac_on) {
		TIM3->ARR = firing_delay;
		timer_start(TIM3, TIMER_ONESHOT);
	}

}

void TIM3_IRQHandler(void)
{
	// Clear pending flag
	TIM3->SR &= ~TIM_SR_UIF;

	// User code
	GPIOA->ODR |= 1 << 1;
	delay_us(100);
	GPIOA->ODR &= ~(1 << 1);
}