serial.c

完整的wav文件播放程序采用lpc2148芯片

/******************************************************************************/
/*  This file is part of the uVision/ARM development tools                    */
/*  Copyright KEIL ELEKTRONIK GmbH 2002-2004                                  */
/******************************************************************************/
/*                                                                            */
/*  SERIAL.C:  Low Level Serial Routines                                      */
/*                                                                            */
/******************************************************************************/

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

#define CR     0x0D


void init_serial (void)  {               /* Initialize Serial Interface       */

	PINSEL0 &= ~(0x0F << 0);
	PINSEL0 |= (0x05 << 0);// 设置I/O连接到UART0 P0.0 P0.1


//  PINSEL0 = 0x00050000;                  /* Enable RxD1 and TxD1              */
  U0LCR = 0x83;                          /* 8 bits, no Parity, 1 Stop bit     */
  U0DLL = 0x08;                          /* 115200 Baud Rate @ 15MHz VPB Clock  */
  U0LCR = 0x03;                          /* DLAB = 0                          */
}


int putchar1 (int ch)  {                  /* Write character to Serial Port    */

  if (ch == '\n')  {
    while (!(U0LSR & 0x20));
    U0THR = CR;                          /* output CR */
  }
  while (!(U0LSR & 0x20));
  return (U0THR = ch);
}


int getkey (void)  {                    /* Read character from Serial Port   */

  if (U0LSR & 0x01)
  {
    return (U0RBR);
  } else {
    return 0;
  }
}