serial.c

keil arm flash fs 最新版 在Ｋｅｉｌ ａｒｍ下使用

/*----------------------------------------------------------------------------
 *      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
 *      Rev.:    V3.22
 *----------------------------------------------------------------------------
 *      This code is part of the RealView Run-Time Library.
 *      Copyright (c) 2004-2008 KEIL - An ARM Company. All rights reserved.
 *---------------------------------------------------------------------------*/

#include <LPC213x.H>                    /* LPC21xx definitions               */

#define CR     0x0D

/*----------------------------------------------------------------------------
 *       init_serial:  Initialize Serial Interface
 *---------------------------------------------------------------------------*/
void init_serial (void) {
   PINSEL0 = 0x00050000;              /* Enable RxD1 and TxD1                */
   U1LCR = 0x83;                      /* 8 bits, no Parity, 1 Stop bit       */
   U1DLL = 0x04;                      /* 234 kBaud @ 15MHz VPB Clock         */
// U1DLL = 97;                        /* 9600 Baud Rate @ 15MHz VPB Clock    */
   U1LCR = 0x03;                      /* DLAB = 0                            */
}

/*----------------------------------------------------------------------------
 *       sendchar:  Write a character to Serial Port
 *---------------------------------------------------------------------------*/
int sendchar (int ch) {
   if (ch == '\n') {
      while (!(U1LSR & 0x20));
      U1THR = CR;                        /* output CR                        */
   }
   while (!(U1LSR & 0x20));
   return (U1THR = ch);
}

/*----------------------------------------------------------------------------
 *       getkey:  Read a character from Serial Port
 *---------------------------------------------------------------------------*/
int getkey (void) {
   while (!(U1LSR & 0x01));
   return (U1RBR);
}

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