#include "stm32f4xx_hal.h"

// Function to initialize PWM
void PWM_Init(void) {
    // PWM Configuration
    TIM_HandleTypeDef htim;
    TIM_OC_InitTypeDef sConfigOC;
  
    htim.Instance = TIM1;
    htim.Init.Prescaler = 0;
    htim.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim.Init.Period = 1000 - 1;  // PWM frequency = Timer clock / (Prescaler * Period)
    htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    HAL_TIM_PWM_Init(&htim);
    
    // PWM Channel Configuration
    sConfigOC.OCMode = TIM_OCMODE_PWM1;
    sConfigOC.Pulse = 0;  // Initial duty cycle
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
    HAL_TIM_PWM_ConfigChannel(&htim, &sConfigOC, TIM_CHANNEL_1);
  
    HAL_TIM_PWM_Start(&htim, TIM_CHANNEL_1);
}

// Function to set PWM duty cycle (brightness)
void PWM_SetDutyCycle(uint16_t dutyCycle) {
    TIM_OC_InitTypeDef sConfigOC;
  
    sConfigOC.OCMode = TIM_OCMODE_PWM1;
    sConfigOC.Pulse = dutyCycle;  // Set duty cycle
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  
    HAL_TIM_PWM_ConfigChannel(&htim, &sConfigOC, TIM_CHANNEL_1);
    HAL_TIM_PWM_Start(&htim, TIM_CHANNEL_1);
}

// Main function
int main(void) {
    // Initialize the hardware
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    PWM_Init();

    // Main loop
    while (1) {
        // Get user input for brightness (0-100)
        uint16_t brightness;
        printf("Enter brightness (0-100): ");
        scanf("%hu", &brightness);

        // Ensure the input is within the valid range
        if (brightness <= 100) {
            PWM_SetDutyCycle((uint16_t)((brightness / 100.0) * 1000));
        } else {
            printf("Please enter a value between 0 and 100.\n");
        }
    }
}