Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Program runs in loop

I have written a program that writes to the user through nios 2 console (jtag uart) and takes user input as well. However, the program does not pause to accept user input. Instead it continues to run...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Ahhh, if you're using the small C library, you're going to have to get trickier.

If I remember right, you may may be able to use the regular "read()" function which I think will block.

You may also want to access the UART driver directly ... 

data = IORD_ALTERA_AVALON_JTAG_UART_DATA(JTAG_UART_0_BASE);
if(data & ALTERA_AVALON_JTAG_UART_DATA_RVALID_MSK){
     // If you're here you've got data to read.
     data = data & ALTERA_AVALON_JTAG_UART_DATA_DATA_MSK;
}else{
     // No data try again
}

Jake