serial.c

来自「STM32F103 SD卡控制程序」· C语言 代码 · 共 39 行

/*----------------------------------------------------------------------------
 *      R T L   F l a s h   F i l e   S y s t e m   E x a m p l e
 *----------------------------------------------------------------------------
 *      Name:    SERIAL.C
 *      Purpose: Serial Input Output for STmicroelectronics STM32
 *      Rev.:    V3.14
 *----------------------------------------------------------------------------
 *      This code is part of the RealView Run-Time Library.
 *      Copyright (c) 2004-2007 KEIL - An ARM Company. All rights reserved.
 *---------------------------------------------------------------------------*/

#include <stm32f10x_lib.h>              /* STM32F10x Library Definitions     */

/*----------------------------------------------------------------------------
 *       sendchar:  Write a character to Serial Port
 *---------------------------------------------------------------------------*/
int sendchar (int ch) {
   if (ch == '\n')  {
      while (!(USART1->SR & USART_FLAG_TXE));
      USART1->DR = '\r';
   }
   while (!(USART1->SR & USART_FLAG_TXE));
   return (USART1->DR = (ch & 0x1FF));
}

/*----------------------------------------------------------------------------
 *       getkey:  Read a character from Serial Port
 *---------------------------------------------------------------------------*/
int getkey (void) {
  while (!(USART1->SR & USART_FLAG_RXNE));
  return ((int)(USART1->DR & 0x1FF));
}

/*----------------------------------------------------------------------------
 * end of file
 *---------------------------------------------------------------------------*/