Serial.c

/*----------------------------------------------------------------------------
 * Name:    Serial.c
 * Purpose: Low level serial routines
 * Note(s):
 *----------------------------------------------------------------------------
 * This file is part of the uVision/ARM development tools.
 * This software may only be used under the terms of a valid, current,
 * end user licence from KEIL for a compatible version of KEIL software
 * development tools. Nothing else gives you the right to use this software.
 *
 * This software is supplied "AS IS" without warranties of any kind.
 *
 * Copyright (c) 2010-2013 Keil - An ARM Company. All rights reserved.
 *----------------------------------------------------------------------------*/

#include "LPC11xx.h"                            /* LPC11xx definitions        */


/*----------------------------------------------------------------------------
  Initialize UART pins, Baudrate
 *----------------------------------------------------------------------------*/
void SER_init (void)
{
   
	/* configure PINs GPIO1.6, GPIO1.7 for UART */
	LPC_SYSCON->SYSAHBCLKCTRL |= ((1UL <<  6) |   /* enable clock for GPIO      */
							      (1UL << 16) );  /* enable clock for IOCON     */

	LPC_IOCON->PIO1_6  =  (1UL <<  0);            /* P1.6 is RxD                */
	LPC_IOCON->PIO1_7  =  (1UL <<  0);            /* P1.7 is TxD                */

	/* configure UART0 */
	LPC_SYSCON->SYSAHBCLKCTRL |=  (1UL << 12);    /* Enable clock to UART       */
	LPC_SYSCON->UARTCLKDIV     =  (4UL <<  0);    /* UART clock =  CCLK / 4     */

	LPC_UART->LCR = 0x83;                   /* 8 bits, no Parity, 1 Stop bit    */
	LPC_UART->DLL = 4;                      /* 115200 Baud Rate @ 12.0 MHZ PCLK */
	LPC_UART->DLL = 12;                     /* 38400 Baud Rate @ 12.0 MHZ PCLK */
	
	LPC_UART->FDR = 0x85;                   /* FR 1.627, DIVADDVAL 5, MULVAL 8  */
	LPC_UART->DLM = 0;                      /* High divisor latch = 0           */
	LPC_UART->LCR = 0x03;                   /* DLAB = 0                         */
	LPC_UART->IER = 0x1; 						 /* enable UART int						 */
	
	LPC_UART->FCR=0x01; 							//enable FIFO 1 byte
//	LPC_UART->MCR=0x40; 							//enable RTS Flow Control
	
	
	//must be set BEFORE enabling the IRQ
	NVIC_SetPriority (UART_IRQn,0x80);
	
	//enable UART in NVIC
	NVIC_EnableIRQ(UART_IRQn);
}


/*----------------------------------------------------------------------------
  Write character to Serial Port
 *----------------------------------------------------------------------------*/
int sendchar (int c)
{

  while (!(LPC_UART->LSR & 0x20));
  LPC_UART->THR = c;

  return (c);
}


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

  while (!(LPC_UART->LSR & 0x01));
  return (LPC_UART->RBR);
}