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#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include "usrp_e.h"
// max length #define PKT_DATA_LENGTH 1016
static int packet_data_length;
struct pkt {
int checksum;
int seq_num;
short data[];
};
static int fp;
static int calc_checksum(struct pkt *p)
{
int i, sum;
i = 0;
sum = 0;
for (i=0; i < packet_data_length; i++)
sum += p->data[i];
sum += p->seq_num;
return sum;
}
static void *read_thread(void *threadid)
{
int cnt, prev_seq_num, pkt_count;
struct usrp_transfer_frame *rx_data;
struct pkt *p;
unsigned long bytes_transfered, elapsed_seconds;
struct timeval start_time, finish_time;
printf("Greetings from the reading thread!\n");
bytes_transfered = 0;
gettimeofday(&start_time, NULL);
// IMPORTANT: must assume max length packet from fpga
rx_data = malloc(sizeof(struct usrp_transfer_frame) + sizeof(struct pkt) + (1016 * 2));
p = (struct pkt *) ((void *)rx_data + offsetof(struct usrp_transfer_frame, buf));
//p = &(rx_data->buf[0]);
printf("Address of rx_data = %p, p = %p\n", rx_data, p);
printf("offsetof = %d\n", offsetof(struct usrp_transfer_frame, buf));
printf("sizeof rx data = %d\n", sizeof(struct usrp_transfer_frame) + sizeof(struct pkt));
prev_seq_num = 0;
pkt_count = 0;
while (1) {
cnt = read(fp, rx_data, 2048);
if (cnt < 0)
printf("Error returned from read: %d\n", cnt);
// printf("Packet received, flags = %X, len = %d\n", rx_data->flags, rx_data->len);
// printf("p->seq_num = %d\n", p->seq_num);
pkt_count++;
if (p->seq_num != prev_seq_num + 1)
printf("Sequence number fail, current = %X, previous = %X, pkt_count = %d\n",
p->seq_num, prev_seq_num, pkt_count);
prev_seq_num = p->seq_num;
if (calc_checksum(p) != p->checksum)
printf("Checksum fail packet = %X, expected = %X, pkt_count = %d\n",
calc_checksum(p), p->checksum, pkt_count);
bytes_transfered += rx_data->len;
if (bytes_transfered > (100 * 1000000)) {
gettimeofday(&finish_time, NULL);
elapsed_seconds = finish_time.tv_sec - start_time.tv_sec;
printf("RX data transfer rate = %f K Samples/second\n",
(float) bytes_transfered / (float) elapsed_seconds / 250);
start_time = finish_time;
bytes_transfered = 0;
}
// printf(".");
// fflush(stdout);
// printf("\n");
}
}
static void *write_thread(void *threadid)
{
int seq_number, i, cnt;
struct usrp_transfer_frame *tx_data;
struct pkt *p;
printf("Greetings from the write thread!\n");
tx_data = malloc(sizeof(struct usrp_transfer_frame) + sizeof(struct pkt) + (packet_data_length * 2));
p = (struct pkt *) ((void *)tx_data + offsetof(struct usrp_transfer_frame, buf));
printf("Address of tx_data = %p, p = %p\n", tx_data, p);
printf("sizeof rp_transfer_frame = %d, sizeof pkt = %d\n", sizeof(struct usrp_transfer_frame), sizeof(struct pkt));
for (i=0; i < packet_data_length; i++)
// p->data[i] = random() >> 16;
p->data[i] = i;
tx_data->flags = 0xdeadbeef;
tx_data->len = 8 + packet_data_length * 2;
printf("tx_data->len = %d\n", tx_data->len);
seq_number = 1;
while (1) {
// printf("tx flags = %X, len = %d\n", tx_data->flags, tx_data->len);
p->seq_num = seq_number++;
p->checksum = calc_checksum(p);
cnt = write(fp, tx_data, 2048);
if (cnt < 0)
printf("Error returned from write: %d\n", cnt);
// sleep(1);
}
}
int main(int argc, char *argv[])
{
pthread_t tx, rx;
long int t;
struct sched_param s = {
.sched_priority = 1
};
if (argc < 2) {
printf("%s data_size\n", argv[0]);
return -1;
}
packet_data_length = atoi(argv[1]);
fp = open("/dev/usrp_e0", O_RDWR);
printf("fp = %d\n", fp);
sched_setscheduler(0, SCHED_RR, &s);
if (pthread_create(&rx, NULL, read_thread, (void *) t)) {
printf("Failed to create rx thread\n");
exit(-1);
}
sleep(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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