#define FOSC (long) 4000000

// for some reason this macro generates a 'loss of significant bits'
// compile error when used, so use the baud rate constants below.
// (This might be a limitation of the freeware cc5x compiler.)
// #define BAUD_FACTOR(bit_rate) (char) (FOSC / (bit_rate * 16) - 1)

// baud rate constants (assuming 4Mhz clock)
#define B2400	103
#define B9600	25

// macros

#define uart_byte_ready() RCIF
#define uart_clear_error() CREN = 0; uart_init(B9600)


void uart_init(char W)	// initialize the uart
			// W is baud rate constant (see above)
{
    SYNC = 0;		// asynchronous serial i/o
    BRGH = 1;		// high speed clock
    SPBRG = W; 		// set baud rate register
    SPEN = 1;		// enable serial port
    TX9 = 0;		// transmit 8 data bits
    TXEN = 1;		// enable serial transmit
    CREN = 1;		// enable serial receive
    RX9 = 0;		// receive 8 data bits
}


void uart_putb(char W)	// transmit a byte via the uart
			// W is the byte to transmit
{
    while (!TXIF)	// wait until transmit register is empty
        ;

    TXREG = W;		// put the byte in the transmit register
}


char uart_getb(void)	// wait for a byte from the uart
			// returns the byte received
{
    while (!RCIF)	// wait for a byte to be received
        ;

    return RCREG;	// fetch & return the byte
}

void uart_puthex(char c) // transmit a byte as 2 hex characters 
{
    char dig;

    dig = c >> 4;	// get high digit
    if (dig <= 9)
        dig = dig + '0';
    else
        dig = dig + 'A' - 10;    
    uart_putb(dig);

    dig = c & 0x0F;	// get low digit
    if (dig <= 9)
        dig = dig + '0';
    else
        dig = dig + 'A' - 10;    
    uart_putb(dig);
}

#define uart_error() (RCSTA & 0b00000110)