Summer 2024/2025 APO
This page serves as a page for additional materials. The main page is CourseWare.
Lab1 Examples
Binary to decimal conversion and vice versa, hexadecimal numbers, two’s complement, C binary operators. Slides.
Lab2 Examples
Multiplication, IEEE 754. Slides
Lab7 Examples
Jump predictions. Slides
Lab9
Virtual memory, OS syscalls. Slides
Lab10
How to communicate with your MZAPO board using UDP/IP. The example features two source codes, one for the sender (the host PC), the second one for the receiver (the MZAPO board).
sender.c
: The code also switches the terminal to the raw mode, so no enter pressed are needed and makes the control intuitive. Usage: argv[1]
is the MZAPO IP address, argv[2]
is the UDP port.
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#define MAX_BUF 100
int main(int argc, char* argv[])
{
int sockd;
struct sockaddr_in my_addr, srv_addr;
char buf[MAX_BUF];
int count;
int addrlen;
if (argc < 3)
{
fprintf(stderr, "Usage: %s ip_address port_number\n", argv[0]);
exit(1);
}
/* Create a UDP socket */
sockd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockd == -1)
{
perror("Socket creation error");
exit(1);
}
/* Configure client address */
my_addr.sin_family = AF_INET;
my_addr.sin_addr.s_addr = INADDR_ANY;
my_addr.sin_port = 0;
bind(sockd, (struct sockaddr*)&my_addr, sizeof(my_addr));
/* Set server address */
srv_addr.sin_family = AF_INET;
inet_aton(argv[1], &srv_addr.sin_addr);
srv_addr.sin_port = htons(atoi(argv[2]));
/* The raw mode */
struct termios params, old;
tcgetattr(0, ¶ms);
old = params;
cfmakeraw(¶ms);
tcsetattr(0, TCSANOW, ¶ms);
while (1) {
/* Read without any enter presses */
char c = getchar();
if (c == 'q' || c == 'Q') {
/* If q or Q is pressed, quit */
break;
}
buf[0] = c;
sendto(sockd, buf, 1, 0, (struct sockaddr*)&srv_addr, sizeof(srv_addr));
}
tcsetattr(0, TCSANOW, &old);
close(sockd);
return 0;
}
receiver.c
: run using make run TARGET_IP=...
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define MAX_BUF 1024
#define MZAPO_PORT 5000
int main(int argc, char* argv[])
{
int sockd;
struct sockaddr_in my_name, cli_name;
char buf[MAX_BUF];
int status;
int addrlen;
/* Create a UDP socket */
sockd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockd == -1)
{
perror("Socket creation error");
exit(1);
}
/* Configure server address */
my_name.sin_family = AF_INET;
my_name.sin_addr.s_addr = INADDR_ANY;
my_name.sin_port = htons(MZAPO_PORT); /* Defined in a macro */
status = bind(sockd, (struct sockaddr*)&my_name, sizeof(my_name));
while (1) {
addrlen = sizeof(cli_name);
status = recvfrom(sockd, buf, MAX_BUF, 0,
(struct sockaddr*)&cli_name, &addrlen);
printf("Received %d bytes. ", status);
for (int i = 0; i < status; ++i) {
putchar(buf[i]);
}
putchar('\n');
}
close(sockd);
return 0;
}