ECE 449 Computer Systems Engineering Assignment 2

Write a description of how you implemented each of the following projects, including Verilog files (use qdoc). Demonstrate the working projects to the instructor.

1. Design and implement a DE2 project that displays a timer on the LCD display in the form mm:ss and on the left-most four seven-segment displays (MM SS).

2. Modify the diglab3 timer so that the timer starts when KEY[3] is pressed and stops with KEY[3] is released.

3. Design and implement a DE2 project that interfaces the previous project to the PIO lines of the Nios II computer. Use one output PIO line to start and stop the timer. Test a Nios program to start and stop the timer and print the results to stdout. Here is a sample.

   #include <stdio.h>
   #include <unistd.h>
   #include "system.h"
   #include "altera_avalon_pio_regs.h"
   
   void test1();
   
   int main()
   {
     int i;
     printf("starting program ...\n");
   
     test1();
     
     printf("ending program\n");
   
     return 0;
   }
   
   void test1()
   {
       int inpt;
       // start timer
       IOWR_ALTERA_AVALON_PIO_DATA(PIO_BASE,1);
       // do nothing then stop timer
       IOWR_ALTERA_AVALON_PIO_DATA(PIO_BASE,0);
       // read timer value and output to console
       inpt = IORD_ALTERA_AVALON_PIO_DATA(PIO_BASE);
       printf("empty loop test time: %d\n",inpt);
   }
   

4. Download this source-highlighting utility, copy the relevant files to your bin directory and use the utility to process your strgen/strlen program. Submit the resulting html files.

5. Disassemble your strgen/strlen program from the last assignment and submit a file containing the disassembly listing.

Maintained by John Loomis, last updated 21 January 2009