#include "stm32c0xx_hal.h"

/* Defines */
#define User_Button_Pin GPIO_PIN_13
#define User_Button_GPIO_Port GPIOC
#define User_Button_EXTI_IRQn EXTI4_15_IRQn
#define Led_Pin GPIO_PIN_5
#define Led_GPIO_Port GPIOA

/* Private variables */
I2C_HandleTypeDef hi2c1;
SPI_HandleTypeDef hspi1;
UART_HandleTypeDef huart2;

/* Function prototypes */
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_SPI1_Init(void);

/* 74HC595 — LATCH (ST_CP) pin initialization */
void LATCH_Init()
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void LATCH_Set(uint8_t val)
{
    if (val)
        HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
    else
        HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_RESET);
}

/* SPI SEND */
void Send(uint8_t out_value)
{
    LATCH_Set(0);
    HAL_SPI_Transmit(&hspi1, (uint8_t*)&out_value, 1, 100);
    LATCH_Set(1);
}

/* DIP-switch Read (PA0–PA7)*/
uint8_t Read_DIP(void)
{
    uint8_t value = 0;

    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET) ? (1<<0) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET) ? (1<<1) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET) ? (1<<2) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3) == GPIO_PIN_RESET) ? (1<<3) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_4) == GPIO_PIN_RESET) ? (1<<4) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5) == GPIO_PIN_RESET) ? (1<<5) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_6) == GPIO_PIN_RESET) ? (1<<6) : 0;
    value |= (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) == GPIO_PIN_RESET) ? (1<<7) : 0;

    return value;
}


// Таблиця для 7-сегментного індикатора (коммон анод) для цифр 1–8
uint8_t digit_table[10] = {
    0b11111111, // All OFF
    0b01101110, // B, C
    0b00000101, // A, B, G, E, D
    0b00100100, // A, B, G, C, D
    0b01101000, // F, G, B, C
    0b00110000, // A, F, G, C, D
    0b00010000, // A, F, G, C, D, E
    0b01100110, // A, B, C
    0b00000000  // Усі сегменти
};



uint8_t DIP_to_digit(uint8_t dip_val)
{
    for(uint8_t i = 0; i < 8; i++)
    {
        if(dip_val & (1 << i)) // якщо біт увімкнений
        {
            return i + 1; // цифра від 1 до 8
        }
    }
    return 0; // якщо нічого не увімкнено
}

/* MAIN */
int main(void)
{
    HAL_Init();
    SystemClock_Config();

    MX_GPIO_Init();
    MX_USART2_UART_Init();
    MX_SPI1_Init();
    MX_I2C1_Init();
    LATCH_Init();

    while (1)
{
    uint8_t dip_val = Read_DIP();
    uint8_t digit = DIP_to_digit(dip_val);
    Send(digit_table[digit]);  
    HAL_Delay(100);

}
}

/* CLOCK CONFIG */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
}

/* I2C INIT */
static void MX_I2C1_Init(void)
{
  hi2c1.Instance = I2C1;
  hi2c1.Init.Timing = 0x20303E5D;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }

  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
  {
    Error_Handler();
  }
}

/* SPI INIT */
static void MX_SPI1_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_I2S1;
  PeriphClkInit.I2s1ClockSelection = RCC_I2S1CLKSOURCE_SYSCLK;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }

  __HAL_RCC_SPI1_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /**SPI1 GPIO Configuration
  PA1 -> SCK
  PA7 -> MOSI
  */
  GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_7;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF0_SPI1;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 7;
  hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
}

/* UART INIT */
static void MX_USART2_UART_Init(void)
{
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
}

/* GPIO INIT */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  HAL_GPIO_WritePin(Led_GPIO_Port, Led_Pin, GPIO_PIN_SET);

  /* User button */
  GPIO_InitStruct.Pin = User_Button_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(User_Button_GPIO_Port, &GPIO_InitStruct);

  /* LED */
  GPIO_InitStruct.Pin = Led_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  HAL_GPIO_Init(Led_GPIO_Port, &GPIO_InitStruct);

  /* DIP-switch PB0–PB7 */
  GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 |
                      GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
}

/* ERROR HANDLER */
void Error_Handler(void)
{
  __disable_irq();
  while (1) {}
}