ATSAM3X8E UART_RHR Problem

Hardware Arduino Due
1

Hey there, I'm trying to read an incoming byte from the Terminal window on Atmel Studio. When I send a character it always reads to 255 in the RXCHR portion of RHR. It is transmitting just fine, the problem is just with the receive

#include <asf.h>
#include <stdio.h>
void uart_getchar(void);
static void uart_getString(uint8_t *c, int length);
static int uart_putchar(const uint8_t c);
static void uart_putString(uint8_t *c,int lenght);

int main (void)
{
	SystemInit();
	//Config UART Start
	WDT->WDT_MR = WDT_MR_WDDIS;
	//Disable port functions of required PA
	PIOA->PIO_PDR=(PIO_PA9A_UTXD)|(PIO_PA8A_URXD);
	//Select peripheral. A function between A and B
	PIOA->PIO_ABSR=~((PIO_PA9A_UTXD)|(PIO_PA8A_URXD));
	//Enable port functions of required PB	
	PIOB->PIO_PER=PIO_PER_P27;
	//Declare required PB as output
	PIOB->PIO_OER=PIO_OER_P27;	
	//Enable write protect of Peripheral Controller
	PMC->PMC_WPMR=1;	
	//Enable required Peripherals clock
	PMC->PMC_PCER0=(PMC_PCER0_PID8)|(PMC_PCER0_PID12);
	//Enable pull-ups on RX and TX
	//PIOA->PIO_PUER=(PIO_PA8A_URXD)|(PIO_PA9A_UTXD);
	PIOA->PIO_PUER=(PIO_PA9A_UTXD);
	PIOA->PIO_PUDR=PIO_PA8A_URXD;
	//Disable pull-ups on outputs
	PIOB->PIO_PUDR|=PIO_PUDR_P27;
	//Enable required PB to be written directly
	PIOB->PIO_OWER|=PIO_OWER_P27;	
	//Disable UART transfer
	UART->UART_PTCR=(UART_PTCR_RXTDIS)|(UART_PTCR_TXTDIS);
	//Set baud rate	
	UART->UART_BRGR=(SystemCoreClock / 9600) >> 4 ;
	//Initially disable all the RX and TX and reset them		
	UART->UART_CR=(UART_CR_RSTRX)|(UART_CR_RSTTX)|(UART_CR_RXDIS)|(UART_CR_TXDIS);
	//Set the Mode of communication	
	UART->UART_MR=(UART_MR_PAR_NO)|(UART_MR_CHMODE_NORMAL);
	//Enable Transfer
	UART->UART_PTCR=(UART_PTCR_RXTEN)|(UART_PTCR_TXTEN);
	//Enable RX and TX 
	UART->UART_CR=(UART_CR_RXEN)|(UART_CR_TXEN);
	//Config UART Stop 

while(1)
{	
	delay_ms(1000);
	uart_getchar();
	delay_ms(1000);
}


	return 0;
}

void uart_getchar(void)
{
		if((UART->UART_SR & UART_SR_RXRDY)== 0) {
		uart_putchar('

The thing is when I haven't sent any thing it will print $ in terminal window but when I send some character it will print "ÿ" which has ASCII 255 meaning the RXCHR is always full no matter what after sending the character. I'll be thankful if you could solve my problem.);
}
else if((UART->UART_SR & UART_SR_RXRDY) != 0)
{
uint8_t c = UART_RHR_RXCHR_Msk;
uart_putchar(c);
}
}

static int uart_putchar(const uint8_t  c)
{
// Check if the transmitter is ready

// Send the character
UART->UART_THR = c;
while(!((UART->UART_SR) & UART_SR_TXEMPTY)); // Wait for the characters to be send
return 0;

}
static void uart_putString(uint8_t *c,int length)
{
int i = 0;
//unsigned long long int length =sizeof(c);
for(i=0; i<length; i++) {
uart_putchar(c[i]);
}
}


The thing is when I haven't sent any thing it will print $ in terminal window but when I send some character it will print "**ÿ**" which has ASCII 255 meaning the RXCHR is always full no matter what after sending the character. I'll be thankful if you could solve my problem.
2

I can't seem to edit my post so I'm replying for the edit but it still not works:
There is a bit mistake in the uart_getchar() function the edited version is as follows:

void uart_getchar(void)
{
	// Check if the receiver is ready
	if((UART->UART_SR & UART_SR_RXRDY)== 0) {
		uart_putchar('

and the last lines are as follows:
The thing is when I haven't sent any thing it will print $ in terminal window but when I send some character it will print will '^' which confirms that something was received but then it will give the space and goes to the next line and starts over. I'll be thankful if you could solve my problem.);
}
else if((UART->UART_SR & UART_SR_RXRDY) != 0)
{
uart_putchar('^');
unsigned char c =UART->UART_RHR;
uart_putchar(c);
}


and the last lines are as follows:
The thing is when I haven't sent any thing it will print $ in terminal window but when I send some character it will print will '^' which confirms that something was received but then it will give the space and goes to the next line and starts over. I'll be thankful if you could solve my problem.
3

Before sending a character, you have first to check that the transmitter is ready. And using interrupts to capture input characters would be a good idea.

See this blog for detailed info: