serial.c

Analog Digital conversion with lpc2148

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

#include "LPC214x.h"
#include "target.h"
#include "serial.h"

#define CR     0x0D

/* Initialize Serial Interface UART0 */
void init_serial0 ( unsigned long baudrate )  
{
	unsigned long Fdiv;

	PINSEL0 = 0x00000005;                  /* Enable RxD0 and TxD0              */
	U0LCR = 0x83;                          /* 8 bits, no Parity, 1 Stop bit     */
	Fdiv = ( Fpclk / 16 ) / baudrate ;     /* baud rate                        */
	U0DLM = Fdiv / 256;
	U0DLL = Fdiv % 256;
	U0LCR = 0x03;                           /* DLAB = 0                         */
}

/* Write character to Serial Port 0 with \n -> \r\n  */
int putchar_serial0 (int ch)
{
	if (ch == '\n')  {
		while (!(U0LSR & 0x20));
		U0THR = CR;                  /* output CR */
	}
	while (!(U0LSR & 0x20));
	return (U0THR = ch);
}

/* Write character to Serial Port 0 without \n -> \r\n  */
int putc_serial0 (int ch)
{
	while (!(U0LSR & 0x20));
	return (U0THR = ch);
}


void putstring_serial0 (const char *string)
{
	char ch;

	while ((ch = *string)) {
		putchar_serial0(ch);
		string++;
	}
}


/* Read character from Serial Port   */
int getkey_serial0 (void)
{
	if (U0LSR & 0x01) {
		return (U0RBR);
	} 
	else {
		return 0;
	}
}