User guide

Nios II IDE Help System

3. Establishes communication with the target board, and verifies that the expected

SOPC Builder system is configured in the FPGA. If the FPGA is not configured

properly, you should repeat the steps to configure the hardware.

4. Downloads the executable file (.elf) to memory on the target board.

5. Instructs the Nios II processor to begin executing the code.

After using the Run As command once, to run again click

Run on the toolbar.

Running on the ISS

To run using the ISS, perform these steps to run the executable code:

1. Right-click the tutorial project in the Nios II C/C++ Projects view.

2. Point to Run As, and then click

Nios II Instruction Set Simulator. After a

moment, output displays in the Console view. The count output appears very

slowly because there are delay loops (usleep function calls) in the code.

The ISS does not model the LED, seven-segment display, or LCD peripherals. Only the

console output displays in the Console view.

To analyze the output:

Program output appears on the development board and in the Console view of the Nios II

IDE. The Console view maintains a terminal I/O connection with a communication device

connected to the Nios II processor in the SOPC Builder system, such as a JTAG UART.

When the Nios II program writes to stdout or stderr, the Console view displays the text.

The Console view can also accept character input from the host keyboard, which is sent to

the processor and read as stdin. (The count_binary.c program does not read any input, so

typing in the Console view when running this project has no effect.)

To terminate the terminal connection to the target, click

Terminate in the Console

view. Terminating only disconnects the host from the target; the target processor

continues executing.

After successfully running the project, you are ready to learn how to use the debugger in the

next section of the tutorial.

Next: Debugging the Project

Previous: Building the Project