LPc17xx uart program

I have a problem with uart interface , I tried to start program " hello wold " but on the serial dont display it please I need help . I will post the code :
SERIAL.C :
#include <LPC17xx.H>

#define CR 0x0D
int sendchar (int ch) {

if (ch == '\n') { while (!(LPC_UART1->LSR & 0x20)); LPC_UART1->THR = CR; /* output CR */ } while (!(LPC_UART1->LSR & 0x20)); return (LPC_UART1->THR = ch);
}

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

while (!(LPC_UART1->LSR & 0x01));

return (LPC_UART1->RBR);
}

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RETARGET.C

#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 */
} ::::::::::::::::::::::::::::::::::::::::::::

HELLO.C
#include <stdio.h> /* prototype declarations for I/O functions */
#include <LPC17xx.H> /* LPC21xx definitions */

/****************/
/* main program */
/****************/
int main (void) { /* execution starts here */ uint32_t Fdiv; /* initialize the serial interface */ LPC_PINCON->PINSEL0 &= ~0x000000F0; LPC_PINCON->PINSEL0 |= 0x00000050; /* Enable RxD1 and TxD1 */ LPC_UART1->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */ LPC_UART1->DLL = Fdiv % 256; /* 9600 Baud Rate @ 15MHz VPB Clock */ LPC_UART1->LCR = 0x03; /* DLAB = 0 */

printf ("Hello World\n");

while (1) { ; /* ... */ }}

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