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#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
struct pkt {
int checksum;
int seq_num;
short data[1020];
};
static int fp;
static int calc_checksum(struct pkt *p)
{
int i, sum;
i = 0;
sum = 0;
for (i=0; i<1020; i++)
sum += p->data[i];
sum += p->seq_num;
return sum;
}
static void *read_thread(void *threadid)
{
int cnt, prev_seq_num;
struct pkt rx_data;
printf("Greetings from the reading thread!\n");
prev_seq_num = 0;
while (1) {
cnt = read(fp, &rx_data, 2048);
if (rx_data.seq_num != prev_seq_num + 1)
printf("Sequence number fail, current = %d, previous = %d\n",
rx_data.seq_num, prev_seq_num);
prev_seq_num = rx_data.seq_num;
if (calc_checksum(&rx_data) != rx_data.checksum)
printf("Checksum fail packet = %d, expected = %d\n",
calc_checksum(&rx_data), rx_data.checksum);
}
}
static void *write_thread(void *threadid)
{
int seq_number, i, cnt;
struct pkt tx_data;
printf("Greetings from the write thread!\n");
for (i=0; i<1020; i++)
tx_data.data[i] = random() >> 16;
seq_number = 1;
while (1) {
tx_data.seq_num = seq_number++;
tx_data.checksum = calc_checksum(&tx_data);
cnt = write(fp, &tx_data, 2048);
}
}
int main(int argc, char *argv[])
{
pthread_t tx, rx;
long int t;
fp = open("/dev/usrp_e0", O_RDWR);
printf("fp = %d\n", fp);
if (pthread_create(&rx, NULL, read_thread, (void *) t)) {
printf("Failed to create rx thread\n");
exit(-1);
}
if (pthread_create(&tx, NULL, write_thread, (void *) t)) {
printf("Failed to create tx thread\n");
exit(-1);
}
sleep(10000);
printf("Done sleeping\n");
}
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