Hi guys, I'm struggling with non-blocking UART (RS-232) I/O these days. I'm using the 9.1 suite with Software Build Tools for Eclipse, but it seems that the very same problem was also in previous releases (8.0SP1 for sure). When I enter main() I already have stdin,stdout,stderr already open, and I use them to do my I/O on a serial port. Then, I set the stdin to the non-blocking mode with if (fcntl(STDIN_FILENO,F_SETFL,O_NONBLOCK)==-1) // set stdin to non-blocking mode printf("fcntl() error\n"); and I have no errors. Then, I try to get chars from the UART with getc(stdin) inside a while(1) loop, but it always returns -1, even when I send chars from the terminal. I also tried setting the interrupt control register in the UART core with IOWR_16DIRECT(UART_0_BASE,12,128); which should enable the "interrupt on read ready", but nothing changed. I have no such problem using JTAG_UART, and that's ok while prototyping the system, but soon I need to go with the RS232, so I need to find a solution. Anyone of you had problem with this and got a way to solve it? Thank you very much in advance, ________________________________________________________ tags: color switch online and riddle school 2 or Crappy Bird Game