/* USER CODE BEGIN Header */
/**
	******************************************************************************
	* @file					 : main.c
	* @brief					: Main program body
	******************************************************************************
	* @attention
	*
	* Copyright (c) 2024 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.
	*
	******************************************************************************
	*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define CYCLE_LENGTH 5000
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
enum MODES {
	ALL_PWM = 0,
	SEQUENTIAL_GLOWING = 1,
	SEQUENTIAL_SINGLE_PWM = 2,
	SEQUENTIAL_DOUBLE_PWM = 3,
	SEQUENTIAL_TRIPLE_PWM = 4,
	PAIRED_BLINKING_WITH_PAIRED_GLOWING = 5,
	PAIRED_BLINKING = 6,
	STANDBY = 7,
};

unsigned int current_mode = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
static void paired_blinking(void) {
	HAL_GPIO_WritePin(GPIOD, 0xF000, GPIO_PIN_RESET);

	for (unsigned int j = 0; j < 2; j++) {
		for (unsigned int i = 0; i < 2; i++) {
			HAL_GPIO_WritePin(GPIOD, LED_BLUE_Pin | LED_YELLOW_Pin, GPIO_PIN_SET);
			HAL_Delay(90);
			HAL_GPIO_WritePin(GPIOD, LED_BLUE_Pin | LED_YELLOW_Pin, GPIO_PIN_RESET);
			HAL_Delay(90);
		}

		for (unsigned int i = 0; i < 2; i++) {
			HAL_GPIO_WritePin(GPIOD, LED_RED_Pin | LED_GREEN_Pin, GPIO_PIN_SET);
			HAL_Delay(90);
			HAL_GPIO_WritePin(GPIOD, LED_RED_Pin | LED_GREEN_Pin, GPIO_PIN_RESET);
			HAL_Delay(90);
		}
	}
}

static void paired_glowing(void) {
	for (unsigned int i = 0; i < 4; i++) {
		HAL_GPIO_WritePin(GPIOD, LED_BLUE_Pin | LED_GREEN_Pin, GPIO_PIN_SET);
		HAL_GPIO_WritePin(GPIOD, LED_YELLOW_Pin | LED_RED_Pin, GPIO_PIN_RESET);
		HAL_Delay(180);
		HAL_GPIO_WritePin(GPIOD, LED_YELLOW_Pin | LED_RED_Pin, GPIO_PIN_SET);
		HAL_GPIO_WritePin(GPIOD, LED_BLUE_Pin | LED_GREEN_Pin, GPIO_PIN_RESET);
		HAL_Delay(180);
	}
}
static void paired_blinking_with_paired_glowing(void) {
	paired_blinking();
	paired_glowing();
}

static void pwm_leds_single(uint16_t leds, unsigned int step) {
	int brightness = 0;

	while (brightness <= CYCLE_LENGTH) {
		HAL_GPIO_WritePin(GPIOD, leds, GPIO_PIN_SET);
		for (int j = 0; j < brightness; j++) {
			asm("nop");
		}

		HAL_GPIO_WritePin(GPIOD, leds, GPIO_PIN_RESET);
		for (int j = 0; j < CYCLE_LENGTH - brightness; j++) {
			asm("nop");
		}

		brightness += step;
	}

	while (brightness >= 0) {
		HAL_GPIO_WritePin(GPIOD, leds, GPIO_PIN_SET);
		for (int j = 0; j < brightness; j++) {
			asm("nop");
		}

		HAL_GPIO_WritePin(GPIOD, leds, GPIO_PIN_RESET);
		for (int j = 0; j < CYCLE_LENGTH - brightness; j++) {
			asm("nop");
		}

		brightness -= step;
	}
}

static void pwm_leds_chain(uint16_t leds_on, uint16_t leds_off, unsigned int step) {
	int PWM_HALF_CYCLE = (CYCLE_LENGTH >> 1);

	int on_brightness = 0;

	// leds_on   0 -> on_brightness
	// leds_off  0 -> CYCLE_LENGTH - on_brightness

	// On this stage DUTY_ON is longer for leds_off:
	while (on_brightness <= PWM_HALF_CYCLE) {
		HAL_GPIO_WritePin(GPIOD, leds_on | leds_off, GPIO_PIN_SET);
		for (int j = 0; j < on_brightness; j++) {
			asm("nop");
		}

		HAL_GPIO_WritePin(GPIOD, leds_on, GPIO_PIN_RESET);
		for (int j = on_brightness; j < (CYCLE_LENGTH - on_brightness); j++) {
			asm("nop");
		}

		HAL_GPIO_WritePin(GPIOD, leds_off, GPIO_PIN_RESET);
		for (int j = CYCLE_LENGTH - on_brightness; j < CYCLE_LENGTH; j++) {
			asm("nop");
		}

		on_brightness += step;
	}

	// clamp to half the pwm cycle duration
	on_brightness = PWM_HALF_CYCLE;

	// On this stage DUTY_ON is longer for leds_on:
	while (on_brightness >= 0) {
		HAL_GPIO_WritePin(GPIOD, leds_on | leds_off, GPIO_PIN_SET);
		for (int j = 0; j < on_brightness; j++) {
			asm("nop");
		}

		HAL_GPIO_WritePin(GPIOD, leds_off, GPIO_PIN_RESET);
		for (int j = on_brightness; j < (CYCLE_LENGTH - on_brightness); j++) {
			asm("nop");
		}

		HAL_GPIO_WritePin(GPIOD, leds_on, GPIO_PIN_RESET);
		for (int j = CYCLE_LENGTH - on_brightness; j < CYCLE_LENGTH; j++) {
			asm("nop");
		}

		on_brightness -= step;
	}

	// leave required LEDs on for better chaining effect
	HAL_GPIO_WritePin(GPIOD, leds_on, GPIO_PIN_SET);
	HAL_GPIO_WritePin(GPIOD, leds_off, GPIO_PIN_RESET);
}

static void update_state_counter(unsigned int* current_mode,
								 unsigned int* last_mode,
								 unsigned int* current_state) {
	if (*current_mode != *last_mode) {
		*last_mode = *current_mode;
		*current_state = 0;
		HAL_GPIO_WritePin(GPIOD, LED_RED_Pin | LED_GREEN_Pin | LED_BLUE_Pin | LED_YELLOW_Pin, GPIO_PIN_RESET);
	} else {
		*current_state += 1;
		*current_state &= 0x3;
	}
}
/* USER CODE END 0 */

/**
	* @brief	The application entry point.
	* @retval int
	*/
int main(void)
{

	/* USER CODE BEGIN 1 */

	/* USER CODE END 1 */

	/* MCU Configuration--------------------------------------------------------*/

	/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
	HAL_Init();

	/* USER CODE BEGIN Init */

	/* USER CODE END Init */

	/* Configure the system clock */
	SystemClock_Config();

	/* USER CODE BEGIN SysInit */

	/* USER CODE END SysInit */

	/* Initialize all configured peripherals */
	MX_GPIO_Init();
	/* USER CODE BEGIN 2 */

	/* USER CODE END 2 */

	/* Infinite loop */
	/* USER CODE BEGIN WHILE */
	unsigned int current_state = 0;
	unsigned int last_mode = current_mode;

	while (1)
	{
		switch (current_mode) {
		case ALL_PWM:
			//pwm_leds_single(LED_RED_Pin | LED_YELLOW_Pin | LED_GREEN_Pin | LED_BLUE_Pin, 20);
			pwm_leds_chain(LED_RED_Pin | LED_GREEN_Pin, LED_BLUE_Pin | LED_YELLOW_Pin, 140);
			pwm_leds_chain(LED_BLUE_Pin | LED_YELLOW_Pin, LED_RED_Pin | LED_GREEN_Pin, 140);
			break;

		case SEQUENTIAL_GLOWING:
			update_state_counter(&current_mode, &last_mode, &current_state);
			switch (current_state) {
			case 0:
				HAL_GPIO_WritePin(GPIOD, LED_BLUE_Pin, GPIO_PIN_SET);
				HAL_GPIO_WritePin(GPIOD, LED_GREEN_Pin, GPIO_PIN_RESET);
				break;
			case 1:
				HAL_GPIO_WritePin(GPIOD, LED_RED_Pin, GPIO_PIN_SET);
				HAL_GPIO_WritePin(GPIOD, LED_BLUE_Pin, GPIO_PIN_RESET);
				break;
			case 2:
				HAL_GPIO_WritePin(GPIOD, LED_YELLOW_Pin, GPIO_PIN_SET);
				HAL_GPIO_WritePin(GPIOD, LED_RED_Pin, GPIO_PIN_RESET);
				break;
			case 3:
				HAL_GPIO_WritePin(GPIOD, LED_GREEN_Pin, GPIO_PIN_SET);
				HAL_GPIO_WritePin(GPIOD, LED_YELLOW_Pin, GPIO_PIN_RESET);
				break;
			}
			HAL_Delay(2000);
			break;

		case SEQUENTIAL_SINGLE_PWM:
			update_state_counter(&current_mode, &last_mode, &current_state);
			switch (current_state) {
			case 0:
				pwm_leds_single(LED_BLUE_Pin, 10);
				break;
			case 1:
				pwm_leds_single(LED_RED_Pin, 10);
				break;
			case 2:
				pwm_leds_single(LED_YELLOW_Pin, 10);
				break;
			case 3:
				pwm_leds_single(LED_GREEN_Pin, 10);
				break;
			}
			HAL_Delay(1000);
			break;

		case SEQUENTIAL_DOUBLE_PWM:
			update_state_counter(&current_mode, &last_mode, &current_state);
			switch (current_state) {
			case 0:
				pwm_leds_chain(LED_RED_Pin, LED_BLUE_Pin, 10);
				break;
			case 1:
				pwm_leds_chain(LED_YELLOW_Pin, LED_RED_Pin, 10);
				break;
			case 2:
				pwm_leds_chain(LED_GREEN_Pin, LED_YELLOW_Pin, 10);
				break;
			case 3:
				pwm_leds_chain(LED_BLUE_Pin, LED_GREEN_Pin, 10);
				break;
			}
			HAL_Delay(2000);
			break;

		case SEQUENTIAL_TRIPLE_PWM:
			update_state_counter(&current_mode, &last_mode, &current_state);
			switch (current_state) {
			case 0:
				pwm_leds_chain(LED_YELLOW_Pin, LED_BLUE_Pin, 20);
				break;
			case 1:
				pwm_leds_chain(LED_GREEN_Pin, LED_RED_Pin, 20);
				break;
			case 2:
				pwm_leds_chain(LED_BLUE_Pin, LED_YELLOW_Pin, 20);
				break;
			case 3:
				pwm_leds_chain(LED_RED_Pin, LED_GREEN_Pin, 20);
				break;
			}
			break;

		case PAIRED_BLINKING_WITH_PAIRED_GLOWING:
			paired_blinking_with_paired_glowing();
			break;

		case PAIRED_BLINKING:
			paired_blinking();
			break;

		case STANDBY:
			HAL_GPIO_WritePin(GPIOD, 0xF000, 1);
			break;
		}

		/* USER CODE END WHILE */

		/* USER CODE BEGIN 3 */
	}
	/* USER CODE END 3 */
}

/**
	* @brief System Clock Configuration
	* @retval None
	*/
void SystemClock_Config(void)
{
	RCC_OscInitTypeDef RCC_OscInitStruct = {0};
	RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

	/** Configure the main internal regulator output voltage
	*/
	__HAL_RCC_PWR_CLK_ENABLE();
	__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

	/** Initializes the RCC Oscillators according to the specified parameters
	* in the RCC_OscInitTypeDef structure.
	*/
	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
	RCC_OscInitStruct.HSIState = RCC_HSI_ON;
	RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
	if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
	{
		Error_Handler();
	}

	/** Initializes the CPU, AHB and APB buses clocks
	*/
	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
															|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
	RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
	RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
	RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
	RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

	if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
	{
		Error_Handler();
	}
}

/**
	* @brief GPIO Initialization Function
	* @param None
	* @retval None
	*/
static void MX_GPIO_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

	/* GPIO Ports Clock Enable */
	__HAL_RCC_GPIOA_CLK_ENABLE();
	__HAL_RCC_GPIOD_CLK_ENABLE();

	/*Configure GPIO pin Output Level */
	HAL_GPIO_WritePin(GPIOD, LED_GREEN_Pin|LED_YELLOW_Pin|LED_RED_Pin|LED_BLUE_Pin, GPIO_PIN_RESET);

	/*Configure GPIO pin : PA0 */
	GPIO_InitStruct.Pin = GPIO_PIN_0;
	GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

	/*Configure GPIO pins : LED_GREEN_Pin LED_YELLOW_Pin LED_RED_Pin LED_BLUE_Pin */
	GPIO_InitStruct.Pin = LED_GREEN_Pin|LED_YELLOW_Pin|LED_RED_Pin|LED_BLUE_Pin;
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

	/* EXTI interrupt init*/
	HAL_NVIC_SetPriority(EXTI0_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(EXTI0_IRQn);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
	* @brief	This function is executed in case of error occurrence.
	* @retval None
	*/
void Error_Handler(void)
{
	/* USER CODE BEGIN Error_Handler_Debug */
	/* User can add his own implementation to report the HAL error return state */
	__disable_irq();
	while (1)
	{
	}
	/* USER CODE END Error_Handler_Debug */
}

#ifdef	USE_FULL_ASSERT
/**
	* @brief	Reports the name of the source file and the source line number
	*				 where the assert_param error has occurred.
	* @param	file: pointer to the source file name
	* @param	line: assert_param error line source number
	* @retval None
	*/
void assert_failed(uint8_t *file, uint32_t line)
{
	/* USER CODE BEGIN 6 */
	/* User can add his own implementation to report the file name and line number,
		 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
	/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */