Digital Signal Processing Reference
In-Depth Information
#include "rpds_software.h"
int main( void )
{
unsigned char led_val = 1;
/* Print message to the Nios II IDE console via UART */
printf( "Hello World\n" );
while(1) {
/* Output a 8-bit value to the LEDs */
IOWR_ALTERA_AVALON_PIO_DATA( LEDS_BASE, (led_val & 0xFF) );
if( led_val == 0x80 )
led_val = 1;
else
led_val = led_val << 1;
/* Wait for 0.5 seconds */
usleep( 500000 );
}
return(0);
}
Figure 16.8
This is your first C program's main source file.
16.7 Downloading the Nios II Hardware and Software Projects
To execute your software on a Nios II processor, you must configure the FPGA
with the Nios II hardware reference design and then you can download the
compiled program code to the processor's program memory.
Connect the USB cable. Verify that the
Run/Prog
switch on the DE board is set
to
Run
, and then turn on the DE board. Select
Tools
Quartus II
Programmer…
to configure the FPGA. When the
Quartus II Programmer
appears, click on
Add File…
and select the
rpds16.sof
file from your project
directory. Click
Open
to add the selected file to the download chain. Check the
Program/Configure
box on the row with your configuration file on it, and
click
Start
to begin hardware configuration.
Return to the
Nios II IDE
window. From the
Nios II IDE
window, right click
the
rpds_software
item in the
Nios II C/C++ Projects
pane and select
Build
Project
from the drop-down menu. This will begin a full compilation of all
libraries in your project.
IMPORTANT:
In the reference hardware design, SW9 is used as the Nios II
processor's reset signal. Before code can be downloaded to the processor, it
must be brought out of reset by setting SW9 in the up (or on) position.
To download the compiled code to the Nios II processor executing on the
FPGA, right click the
rpds_software
item in the
Nios II C/C++ Projects
pane
