Rewrite "while((rcvdata = nr_uart_rxchar((np_uart *) 0x00000800)) == -1);" for NiosII

I used to create the Nios project. But, I am a very newcomer for Nios II. so, I want to ask you about my trouble. In Nios project, I used UART to receive the data into Nios. And I used the be...