// A test of the usb1287 serial interface.
//
#include <avr/interrupt.h>

#define  SB(a)                (1<<a)
typedef unsigned char   uint8;
typedef unsigned int    uint16;

#define  CRYSTAL     14745600L
#define  BAUD        19200L

void Delay(int milliseconds);

volatile uint8 Buffer[] = "Hello ";
volatile uint8 byte;
volatile uint8* ptr;


int main(void)
{
   DDRC = 0xff;
   PORTC = 0xff;
   DDRD = 0x01;

   uint16 count = (uint16)(CRYSTAL / 16L / BAUD - 1);
   UBRR1 = count;
   UCSR1B = SB(RXCIE1) | SB(TXCIE1) | SB(RXEN1) | SB(TXEN1);
   UCSR1C = SB(UCSZ11) | SB(UCSZ10);

   sei();

   PORTD |= 0x01;

   ptr = Buffer;
   UDR1 = *ptr++;

   while (1)
   {
      while (*ptr != '\0') {;}
      Delay(10);
      ptr = Buffer;
      UDR1 = *ptr++;
   }

	return 0;
}


ISR(USART1_RX_vect)
{
   byte = UDR1;
   PORTC = ~byte;
   UDR1 = byte;
}


ISR(USART1_TX_vect)
{
   if (*ptr != '\0')
   {
      UDR1 = *ptr++;
   }
}

void Delay(int milliseconds)
{
   volatile int i, j, k;

   for (i=0; i<milliseconds; i++)
      for (j=0; j<550; j++)
         k = j;
}