serial.c

This is an Real-Time Library (RL-ARM) Flash File System file manipulation example.

/*----------------------------------------------------------------------------
 *      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 STR91x
 *      Rev.:    V3.12
 *----------------------------------------------------------------------------
 *      This code is part of the RealView Run-Time Library.
 *      Copyright (c) 2004-2007 KEIL - An ARM Company. All rights reserved.
 *---------------------------------------------------------------------------*/

#include <91x_lib.h>                    /* STR91x definitions                */

/*----------------------------------------------------------------------------
 *       init_serial:  Initialize Serial Interface
 *---------------------------------------------------------------------------*/
void init_serial (void) {
   /* Initialize the serial interface */

   /* Enable TX1 and RX1 pins      */
   SCU->GPIOOUT[3] &= 0xFF3F;
   SCU->GPIOOUT[3] |= 0x0080;
   SCU->GPIOIN[3]  |= 0x04;
   /* 115200 Baud Rate */
   UART1->IBRD = 0x1A;
   UART1->FBRD = 0x03;
   /* 8-bits, no parity, 1 stop bit */
   UART1->LCR  = 0x0060;
   /* Enable UART1 */
   UART1->CR   = 0x0301;
}

/*----------------------------------------------------------------------------
 *       sendchar:  Write a character to Serial Port
 *---------------------------------------------------------------------------*/
int sendchar (int ch) {
   if (ch == '\n')  {
      while (!(UART1->FR & 0x0080));
      UART1->DR = '\r';
   }
   while (!(UART1->FR & 0x0080));
   return (UART1->DR = ch);
}

/*----------------------------------------------------------------------------
 *       getkey:  Read a character from Serial Port
 *---------------------------------------------------------------------------*/
int getkey (void) {
  while ((UART1->FR & 0x10));
  return (UART1->DR);
}

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