while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
		
		
		//HAL_UART_Transmit_DMA(&huart2, (uint8_t*)&res, 50);
		
		if(btn1_flag_irq && (HAL_GetTick() - btn1_time_irq) > 200)
		{
		
			HAL_GPIO_WritePin(param == 0 ? LD1_GPIO_Port : param == 1 ? LD2_GPIO_Port : LD3_GPIO_Port, param == 0 ? LD1_Pin : param == 1 ? LD2_Pin : LD3_Pin, GPIO_PIN_SET);
			param = (param + 1) % 3;
			HAL_GPIO_WritePin(param == 0 ? LD1_GPIO_Port : param == 1 ? LD2_GPIO_Port : LD3_GPIO_Port, param == 0 ? LD1_Pin : param == 1 ? LD2_Pin : LD3_Pin, GPIO_PIN_RESET);
			
			btn1_flag_irq = 0;
		}
		
		if(btn3_flag_irq && (HAL_GetTick() - btn3_time_irq) > 200)
		{
			
			if(param == 0){
				
				if(A + 0.1 <= 2.0){
					A += 0.1;
				}	
			}
			
			if(param == 1){
				f = ((int)f + 10) % 10000 ;
			}
			
			if(param == 2){
				fi0 = fmod(fi0 + pi / 2, 2 * pi);
			}
			
			btn3_flag_irq = 0;
		}
		
		if(btn2_flag_irq && (HAL_GetTick() - btn2_time_irq) > 200)
		{
			
			if(param == 0){
				
				if(A - 0.1 > 0){
					A = A - 0.1;
				}	
			}
			
			if(param == 1){
				f -= 10;
				if(f < 1){
					f = 1;
				}
			}
			
			if(param == 2){
					fi0 = fmod(fi0 - pi / 2, 2 * pi);
				    //if (fi0 < 0) {
							//fi0 += 2 * pi; // Ensure it's non-negative
						//}
			}
			
			btn2_flag_irq = 0;
		}
		
		
		if(next_flag_irq){
			next_flag_irq = 0;
			float T = 1/f;
			result = 2 * A / pi * asin(sin(2 * pi * f * n / (float)N + fi0));
			HAL_UART_Transmit_DMA(&huart2, (uint8_t*)&result, 4);
			
		}
		
		__wfi();
		
  }