#include "stm32c0xx_hal.h"
#include "string.h"

#define TFT_DC   GPIO_PIN_2
#define TFT_CS   GPIO_PIN_3
#define TFT_RST  GPIO_PIN_4
#define GPIO_PORT GPIOA  // Assuming pins are on Port A (change as needed)

// Define SPI handle
SPI_HandleTypeDef hspi1;

// Function prototypes
void SystemClock_Config(void);
void GPIO_Init(void);
void SPI1_Init(void);
void ILI9341_Init(void);
void ILI9341_SendCommand(uint8_t cmd);
void ILI9341_SendData(uint8_t data);
void ILI9341_Reset(void);
void ILI9341_DisplayText(uint16_t x, uint16_t y, const char* text, uint16_t color, uint16_t size);

int main(void)
{
    // Initialize the HAL Library
    HAL_Init();
    
    // Configure the system clock
    SystemClock_Config();
    
    // Initialize GPIO and SPI
    GPIO_Init();
    SPI1_Init();
    
    // Initialize ILI9341 display
    ILI9341_Init();
    
    // Display some text on the screen
    ILI9341_DisplayText(20, 120, "Hello STM32", 0xF800, 3);  // Red text
    ILI9341_DisplayText(24, 160, "I can do SPI :-)", 0x07E0, 2);  // Green text
    
    // Infinite loop (normally the loop function in Arduino)
    while(1)
    {
        HAL_Delay(10);
    }
}

// System Clock Configuration (adjust as needed)
void SystemClock_Config(void)
{
    // Typically, STM32CubeMX or HAL library configures this.
    // You can configure your system clock here if needed.
}

// GPIO Initialization (Configuring TFT control pins and SPI SCK, MISO, MOSI)
void GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    // Enable GPIOA clock (or other port depending on pin assignments)
    __HAL_RCC_GPIOA_CLK_ENABLE();
    
    // Configure TFT control pins (DC, CS, RST)
    GPIO_InitStruct.Pin = TFT_DC | TFT_CS | TFT_RST;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;  // Push-pull output
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIO_PORT, &GPIO_InitStruct);
    
    // Configure SPI pins (SCK, MOSI, MISO) – make sure they are set correctly in CubeMX or your code
    // Typically these pins are on GPIOA or GPIOB depending on your configuration
}

// SPI Initialization (for SPI1)
void SPI1_Init(void)
{
    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_8;  // Adjust as needed
    hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
    hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
    hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    hspi1.Init.CRCPolynomial = 7;
    if (HAL_SPI_Init(&hspi1) != HAL_OK)
    {
        // Initialization Error
        while(1);
    }
}

// ILI9341 Initialization (sending commands to the display)
void ILI9341_Init(void)
{
    ILI9341_Reset();
    
    // Reset and setup ILI9341 display (initialize with some basic settings)
    ILI9341_SendCommand(0x01);  // Software Reset
    HAL_Delay(150);
    ILI9341_SendCommand(0x28);  // Display off
    ILI9341_SendCommand(0x3A);  // Interface Pixel Format
    ILI9341_SendData(0x55);     // 16-bit color
    ILI9341_SendCommand(0x36);  // Memory Data Access Control
    ILI9341_SendData(0x48);     // Rotate screen
    ILI9341_SendCommand(0x29);  // Display on
}

// Send Command to ILI9341
void ILI9341_SendCommand(uint8_t cmd)
{
    HAL_GPIO_WritePin(GPIO_PORT, TFT_DC, GPIO_PIN_RESET);  // DC pin low for command
    HAL_GPIO_WritePin(GPIO_PORT, TFT_CS, GPIO_PIN_RESET);  // CS pin low (select)
    HAL_SPI_Transmit(&hspi1, &cmd, 1, 1000);
    HAL_GPIO_WritePin(GPIO_PORT, TFT_CS, GPIO_PIN_SET);  // CS pin high (deselect)
}

// Send Data to ILI9341
void ILI9341_SendData(uint8_t data)
{
    HAL_GPIO_WritePin(GPIO_PORT, TFT_DC, GPIO_PIN_SET);  // DC pin high for data
    HAL_GPIO_WritePin(GPIO_PORT, TFT_CS, GPIO_PIN_RESET);  // CS pin low (select)
    HAL_SPI_Transmit(&hspi1, &data, 1, 1000);
    HAL_GPIO_WritePin(GPIO_PORT, TFT_CS, GPIO_PIN_SET);  // CS pin high (deselect)
}

// Reset the ILI9341 display
void ILI9341_Reset(void)
{
    HAL_GPIO_WritePin(GPIO_PORT, TFT_RST, GPIO_PIN_RESET);  // Reset pin low
    HAL_Delay(50);
    HAL_GPIO_WritePin(GPIO_PORT, TFT_RST, GPIO_PIN_SET);    // Reset pin high
    HAL_Delay(150);
}

// Display Text on ILI9341
void ILI9341_DisplayText(uint16_t x, uint16_t y, const char* text, uint16_t color, uint16_t size)
{
    // This is a simplified function to write text to the display
    // Implement or use a library to send text pixel-by-pixel if you need full text rendering
    // You can either create your own font or use an existing library

    // Note: This example assumes a basic font or pixel-writing function is available
    // You can implement more complex functions for better text rendering
}