Urgent HELP!!! RS232 problem

Hi all,

I trying to send signal through the RS232 port.

I have problem in sending out the integer/character. Below is my code:

void serial()

{

unsigned int a = 0x61626364;

char* msg = "Testing 't'.\n";

char *b;

char e[16];

unsigned char ch='f';

int c;

system("pause");

FILE *fp;

fp = fopen ("/dev/uart_0", "r+");

while(1)

{

b=&e;

for(c=16;c>=1;c--)

if (fp)

{

*b = getc(fp);

printf("%c",*b);

//if (ferror(fp))// Check if an error occurred with the file

//clearerr(fp);// If so, clear it

//putc('c',fp);

}

for(c=16;c>=1;c--)

{

IOWR_ALTERA_AVALON_UART_TXDATA(UART_0_BASE,ch);

usleep(1000);

} THIS IS THE PROBLEM PART!!!

}

}

If possible, please provide me with example of simple RS232 transmission.

THANKS!!

Regards

Vincoldes