a

int main(void) {
  oled_Init();
  char buf = 0;
  char buffer[32];
  for (int i = 0; i < 32; i++) buffer[i] = '\0';
  while (1)
  {
	  HAL_StatusTypeDef state = HAL_UART_Receive(&huart1, &buf, 1, 50);
	  if (state == HAL_OK) {
		  switch (buf) {
		  	  case 13: oled_GotoNextLine(Font_7x10); break;
		  	  case 127: oled_DeleteLastChar(Font_7x10, Black); break;
		  	  default:
				  oled_WriteChar(buf, Font_7x10, White);
				  break;
		  }
		  oled_UpdateScreen();
	  }
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  return 0;
}