Mine

cyg_uint32 usart2_isr(cyg_vector_t vector,cyg_addrword_t data)
{
	volatile serial_msg *smsgs = (serial_msg *) data;
	//diag_printf("ISR\n");
	
	cyg_interrupt_mask(vector);
	cyg_interrupt_acknowledge(vector);
	
	if((usart2_port[5] & 0x02) == 0x02)
	{
		//diag_printf("Sending\n");
		usart2_port[7] = g_sendStr[transIndex];
		transIndex++;
		diag_printf("TI: %d\n",transIndex);
		cyg_interrupt_unmask(vector);
		usart2_port[3] = 0x2;
		return CYG_ISR_HANDLED;
	}
	else if((usart2_port[5] & 0x01) == 0x01) 
	{
		//diag_printf("Receiving\n");
		smsgs->fromISR = usart2_port[6]; 
		return CYG_ISR_CALL_DSR;
	}