text: #ifndef _USART_H
  #define _USART_H
  
  /**
   * UART		STM32F4xx	Description
   * --------------------------------------
   * TXD		PC11		PC11 is RX on STM
   * RXD		PC10 		PC10 is TX on STM
   * GND		GND			Ground
   */
  
  void USART_TX_RX_GPIO_config();
  void USART_config();
  void USART_interrupt_config();
  void USART_send_char(uint8_t data);
  void USART_run_config();
  
  #endif