Atmega 2560 USART not giving correct value on terminal - serial-port

Question

I am working on the serial communication of my MultiWii Pro board, which is based on a atmega2560. I am using avr-gcc to compile and avrdude to program.
Here is my problem. I am trying to get atmega2560 to send something (hex value) to the terminal. However, regardless of the value assigned to UDR2 and regardless the value I assigned to UBRR2L and UBRR2H, the terminal output is always 0xff if I set the terminal baud-rate at 9600, and 0xff if I set the terminal baud-rate at 115200.
Here is my code
#define F_CPU 8000000UL
#define BAUDRATE 19200 //The baudrate to use
#define BAUD_PRESCALLER ((F_CPU / (BAUDRATE * 16UL))-1)
static void InitializeUART()
{
UBRR2L = (uint8_t)(BAUD_PRESCALLER);
UBRR2H = (uint8_t)(BAUD_PRESCALLER>>8);
UCSR2B |= (1<<RXEN2) | (1<<TXEN2); //RX TX Enable
UCSR2C |= (1<<USBS2)|(1<<UCSZ21)|(1<<UCSZ20);
}
And my sending function
void USART2Write(char data)
{
while( !(UCSR2A & (1<<UDRE2)));
UCSR2B &= ~(1<<TXB82); //in the case if there are more than 8 bits of data
if(data & 0x100)
{
UCSR2B |= (1 << TXB82);
}
UDR2 = data;
}
In my case, the baudrate of my code is 19200. The terminal baudrate is also 19200. No matter what I assigned to UDR2, the output will always be 0x15.
Here is my fuse setting
Low High Extended
0xFF 0xD8 0xFD

Answer 1

UCSR2C |= (1<<USBS2)|(1<<UCSZ21)|(1<<UCSZ20);
USBS2 sets 2 stop bits. Is this intentional?
void USART2Write(char data){
while( !(UCSR2A & (1<<UDRE2)));
UCSR2B &= ~(1<<TXB82); //in the case if there are more than 8 bits of data
if(data & 0x100) {
UCSR2B |= (1 << TXB82);
}
UDR2 = data;
}
If you really want to use 9 data bits, UCSZ22, UCSZ21 and UCSZ20 have to be set. YOu only set UCSZ21 and UCSZ20
UCSR2C |= (1<<USBS2) | (1<<UCSZ21) | (1<<UCSZ20);
so I guess that USBS2 is indeed not what you want here. Maybe you were confused because the flag UCSZ22 is in the UCSR2B register.
So assuming you want 9 data bits and one stop bit use something like this:
static void InitializeUART() {
UBRR2L = (uint8_t)(BAUD_PRESCALLER);
UBRR2H = (uint8_t)(BAUD_PRESCALLER>>8);
UCSR2B |= (1 << RXEN2) | (1 << TXEN2) | (1 << UCSZ22);
UCSR2C |= (1 << UCSZ21) | (1 << UCSZ20);
}
Another thing: Your variable data is of type char and char is normally 8 bit wide. So the condition if(data & 0x100) is never satisfied.