General Purpose I/O: Basic User Interface

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @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.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "drv_lcd.h"
/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
SRAM_HandleTypeDef hsram1;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

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

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t switch_Up() {
    return HAL_GPIO_ReadPin(GPIOG, GPIO_PIN_0) == GPIO_PIN_RESET;
}

uint8_t switch_Down() {
    return HAL_GPIO_ReadPin(GPIOG, GPIO_PIN_1) == GPIO_PIN_RESET;
}

uint8_t switch_Center() {
    return HAL_GPIO_ReadPin(GPIOG, GPIO_PIN_6) == GPIO_PIN_RESET;
}

uint8_t switch_Left() {
    return HAL_GPIO_ReadPin(GPIOG, GPIO_PIN_2) == GPIO_PIN_RESET;
}

uint8_t switch_Right() {
    return HAL_GPIO_ReadPin(GPIOG, GPIO_PIN_5) == GPIO_PIN_RESET;
}

void RGBLED_Config(uint8_t red, uint8_t green, uint8_t blue) {
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2,
        red   ? GPIO_PIN_RESET : GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_3,
        green ? GPIO_PIN_RESET : GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0,
        blue  ? GPIO_PIN_RESET : GPIO_PIN_SET);
}

void ToggleLEDS() {
    RGBLED_Config(switch_Up(), switch_Center(), switch_Down());
}

void print_switches() {
    if (switch_Up()) {
        lcd_show_string(24, 100, 32, "Button Up is Pressed    ");
    } else if (switch_Down()) {
        lcd_show_string(24, 100, 32, "Button Down  is Pressed  ");
    } else if (switch_Left()) {
        lcd_show_string(24, 100, 32, "Button Left  is Pressed  ");
    } else if (switch_Right()) {
        lcd_show_string(24, 100, 32, "Button Right is Pressed ");
    } else if (switch_Center()) {
        lcd_show_string(24, 100, 32, "Button Center is Pressed");
    } else {
        lcd_show_string(24, 100, 32, "                        ");
    }
}
/* 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();
  MX_FSMC_Init();

  /* USER CODE BEGIN 2 */
  drv_lcd_hw_init();
  lcd_clear(GREEN);
  lcd_set_color(GREEN, BLACK);
  lcd_show_string(24, 100, 32, "   START");
  HAL_Delay (1000);

  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_SET);
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_3, GPIO_PIN_SET);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
      print_switches();
      ToggleLEDS();
      HAL_Delay(50);
    /* 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};

  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  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();
  }

  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_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  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 */
  HAL_GPIO_WritePin(GPIOA,
      GPIO_PIN_0 | GPIO_PIN_2 | GPIO_PIN_3,
      GPIO_PIN_SET);
  /* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LCD_BL_GPIO_Port, LCD_BL_Pin, GPIO_PIN_RESET);
  HAL_GPIO_WritePin(LCD_RST_GPIO_Port, LCD_RST_Pin, GPIO_PIN_RESET);

  /* Configure LCD_BL pin */
  GPIO_InitStruct.Pin = LCD_BL_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LCD_BL_GPIO_Port, &GPIO_InitStruct);

  /* Configure LCD_RST pin */
  GPIO_InitStruct.Pin = LCD_RST_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LCD_RST_GPIO_Port, &GPIO_InitStruct);

  /* USER CODE BEGIN MX_GPIO_Init_2 */

  /* Configure LED pins PA0, PA2, PA3 as outputs — start HIGH (LEDs OFF) */
  HAL_GPIO_WritePin(GPIOA,
      GPIO_PIN_0 | GPIO_PIN_2 | GPIO_PIN_3,
      GPIO_PIN_SET);

  GPIO_InitStruct.Pin   = GPIO_PIN_0 | GPIO_PIN_2 | GPIO_PIN_3;
  GPIO_InitStruct.Mode  = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull  = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* Configure switch pins PG0, PG1, PG2, PG5, PG6 as inputs with pull-up */
  GPIO_InitStruct.Pin  = GPIO_PIN_0 | GPIO_PIN_1 |
                         GPIO_PIN_2 | GPIO_PIN_5 | GPIO_PIN_6;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

  /* USER CODE END MX_GPIO_Init_2 */
}

/* FSMC initialization function */
static void MX_FSMC_Init(void)
{

  /* USER CODE BEGIN FSMC_Init 0 */

  /* USER CODE END FSMC_Init 0 */

  FSMC_NORSRAM_TimingTypeDef Timing = {0};

  /* USER CODE BEGIN FSMC_Init 1 */

  /* USER CODE END FSMC_Init 1 */

  hsram1.Instance = FSMC_NORSRAM_DEVICE;
  hsram1.Extended = FSMC_NORSRAM_EXTENDED_DEVICE;
  hsram1.Init.NSBank = FSMC_NORSRAM_BANK3;
  hsram1.Init.DataAddressMux = FSMC_DATA_ADDRESS_MUX_DISABLE;
  hsram1.Init.MemoryType = FSMC_MEMORY_TYPE_SRAM;
  hsram1.Init.MemoryDataWidth = FSMC_NORSRAM_MEM_BUS_WIDTH_8;
  hsram1.Init.BurstAccessMode = FSMC_BURST_ACCESS_MODE_DISABLE;
  hsram1.Init.WaitSignalPolarity = FSMC_WAIT_SIGNAL_POLARITY_LOW;
  hsram1.Init.WrapMode = FSMC_WRAP_MODE_DISABLE;
  hsram1.Init.WaitSignalActive = FSMC_WAIT_TIMING_BEFORE_WS;
  hsram1.Init.WriteOperation = FSMC_WRITE_OPERATION_ENABLE;
  hsram1.Init.WaitSignal = FSMC_WAIT_SIGNAL_DISABLE;
  hsram1.Init.ExtendedMode = FSMC_EXTENDED_MODE_DISABLE;
  hsram1.Init.AsynchronousWait = FSMC_ASYNCHRONOUS_WAIT_DISABLE;
  hsram1.Init.WriteBurst = FSMC_WRITE_BURST_DISABLE;
  hsram1.Init.PageSize = FSMC_PAGE_SIZE_NONE;
  Timing.AddressSetupTime = 1;
  Timing.AddressHoldTime = 15;
  Timing.DataSetupTime = 60;
  Timing.BusTurnAroundDuration = 0;
  Timing.CLKDivision = 16;
  Timing.DataLatency = 17;
  Timing.AccessMode = FSMC_ACCESS_MODE_A;

  if (HAL_SRAM_Init(&hsram1, &Timing, NULL) != HAL_OK)
  {
    Error_Handler();
  }

  /* USER CODE BEGIN FSMC_Init 2 */

  /* USER CODE END FSMC_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 */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */