How to set up a UART0 interrupt with serial window as I/O interface

Hi,

Here are the soft/hardware tools I used:
Software: Uvision4 V4.03q
Board: CP-JR-LPC2368
debug set up with Ulink2

I am a beginner to microcontroller programming. I tried to run a simple UART0 with serial window as I/O interface using the Retarget.c and Serial.c sample (see below) provided by Keil website with the main function below. My hardware setup is just the board and ulink2 connected to PC and the board. and I had flash and start a debug session.

**My question is how can I view the printf string (which i think is the input) through the serial window UART0(which i think is the output)? Thanks in advance for any advice/help!

#include <stdio.h> /* prototype declarations for I/O functions */
#include <LPC23xx.H>

/****************/
/* main program */
/****************/
// Import external functions from Serial.c file
extern void init_serial (void);

int main (void)
{ init_serial();
printf ("uart testing\n");

while (1) {
}

}

/******************************************************************************/
/* RETARGET.C: 'Retarget' layer for target-dependent low level functions */
/******************************************************************************/
#include <stdio.h>
#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

extern int sendchar(int ch); /* in serial.c */

struct __FILE { int handle; /* Add whatever you need here */ };
FILE __stdout;

int fputc(int ch, FILE *f) { return (sendchar(ch));
}

int ferror(FILE *f) { /* Your implementation of ferror */ return EOF;
}

void _ttywrch(int ch) { sendchar(ch);
}

void _sys_exit(int return_code) {
label: goto label; /* endless loop */
}

/******************************************************************************/
/* SERIAL.C: Low Level Serial Routines */
/******************************************************************************/

#include <LPC23xx.H> // LPC23xx definitions

#define UART0 // Use UART 0 for printf

// If UART 0 is used for printf
#ifdef UART0 #define UxFDR U0FDR #define UxLCR U0LCR #define UxDLL U0DLL #define UxDLM U0DLM #define UxLSR U0LSR #define UxTHR U0THR #define UxRBR U0RBR
// If UART 1 is used for printf
#elif defined(UART1) #define UxFDR U1FDR #define UxLCR U1LCR #define UxDLL U1DLL #define UxDLM U1DLM #define UxLSR U1LSR #define UxTHR U1THR #define UxRBR U1RBR
#endif

void init_serial (void) { // Initialize Serial Interface #ifdef UART0 PINSEL0 |= 0x00000050; // Enable TxD0 and RxD0 #elif defined (UART1) PINSEL0 |= 0x40000000; // Enable TxD1 PINSEL1 |= 0x00000001; // Enable RxD1 #endif UxFDR = 0; // Fractional divider not used UxLCR = 0x83; // 8 bits, no Parity, 1 Stop bit UxDLL = 78; // 9600 Baud Rate @ 12.0 MHZ PCLK UxDLM = 0; // High divisor latch = 0 UxLCR = 0x03; // DLAB = 0
}

// Implementation of sendchar (also used by printf function to output data)
int sendchar (int ch) { // Write character to Serial Port

while (!(UxLSR & 0x20));

return (UxTHR = ch);
}

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

while (!(UxLSR & 0x01));

return (UxRBR);
}

Thanks
Rose