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#include <stdio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sys/mman.h>
#include <poll.h>
#include "usrp_e.h"
// max length #define PKT_DATA_LENGTH 1016
static int packet_data_length;
static int error;
struct pkt {
int len;
int checksum;
int seq_num;
short data[1024-6];
};
struct ring_buffer_info (*rxi)[];
struct ring_buffer_info (*txi)[];
struct pkt (*rx_buf)[200];
struct pkt (*tx_buf)[200];
static int fp;
static struct usrp_e_ring_buffer_size_t rb_size;
static int calc_checksum(struct pkt *p)
{
int i, sum;
i = 0;
sum = 0;
for (i=0; i < p->len; i++)
sum += p->data[i];
sum += p->seq_num;
sum += p->len;
return sum;
}
static void *read_thread(void *threadid)
{
int cnt, prev_seq_num, pkt_count, seq_num_failure;
struct pkt *p;
unsigned long bytes_transfered, elapsed_seconds;
struct timeval start_time, finish_time;
int rb_read;
printf("Greetings from the reading thread!\n");
printf("sizeof pkt = %d\n", sizeof(struct pkt));
rb_read = 0;
bytes_transfered = 0;
gettimeofday(&start_time, NULL);
prev_seq_num = 0;
pkt_count = 0;
seq_num_failure = 0;
while (1) {
if (!((*rxi)[rb_read].flags & RB_USER)) {
// printf("Waiting for data\n");
struct pollfd pfd;
pfd.fd = fp;
pfd.events = POLLIN;
ssize_t ret = poll(&pfd, 1, -1);
}
// printf("pkt received, rb_read = %d\n", rb_read);
cnt = (*rxi)[rb_read].len;
p = &(*rx_buf)[rb_read];
// cnt = read(fp, rx_data, 2048);
// if (cnt < 0)
// printf("Error returned from read: %d, sequence number = %d\n", cnt, p->seq_num);
// printf("p = %X, p->seq_num = %d p->len = %d\n", p, p->seq_num, p->len);
pkt_count++;
if (p->seq_num != prev_seq_num + 1) {
printf("Sequence number fail, current = %d, previous = %d, pkt_count = %d\n",
p->seq_num, prev_seq_num, pkt_count);
printf("pkt received, rb_read = %d\n", rb_read);
printf("p = %X, p->seq_num = %d p->len = %d\n", p, p->seq_num, p->len);
seq_num_failure ++;
if (seq_num_failure > 2)
error = 1;
}
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);
error = 1;
}
(*rxi)[rb_read].flags = RB_KERNEL;
rb_read++;
if (rb_read == rb_size.num_rx_frames)
rb_read = 0;
bytes_transfered += cnt;
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 / 4000);
start_time = finish_time;
bytes_transfered = 0;
}
// printf(".");
// fflush(stdout);
// printf("\n");
}
}
static void *write_thread(void *threadid)
{
int seq_number, i, cnt, rb_write;
void *tx_data;
struct pkt *p;
printf("Greetings from the write thread!\n");
tx_data = malloc(2048);
p = (struct pkt *) ((void *)tx_data);
for (i=0; i < packet_data_length; i++)
// p->data[i] = random() >> 16;
p->data[i] = i;
seq_number = 1;
rb_write = 0;
while (1) {
p->seq_num = seq_number++;
if (packet_data_length > 0)
p->len = packet_data_length;
else
p->len = (random() & 0x1ff) + (1004 - 512);
p->checksum = calc_checksum(p);
if (!((*txi)[rb_write].flags & RB_KERNEL)) {
// printf("Waiting for space\n");
struct pollfd pfd;
pfd.fd = fp;
pfd.events = POLLOUT;
ssize_t ret = poll(&pfd, 1, -1);
}
memcpy(&(*tx_buf)[rb_write], tx_data, p->len * 2 + 12);
(*txi)[rb_write].len = p->len * 2 + 12;
(*txi)[rb_write].flags = RB_USER;
rb_write++;
if (rb_write == rb_size.num_tx_frames)
rb_write = 0;
cnt = write(fp, NULL, 0);
// 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
};
int ret, map_size, page_size;
void *rb;
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);
page_size = getpagesize();
ret = ioctl(fp, USRP_E_GET_RB_INFO, &rb_size);
map_size = (rb_size.num_pages_rx_flags + rb_size.num_pages_tx_flags) * page_size +
(rb_size.num_rx_frames + rb_size.num_tx_frames) * (page_size >> 1);
rb = mmap(0, map_size, PROT_READ|PROT_WRITE, MAP_SHARED, fp, 0);
if (rb == MAP_FAILED) {
perror("mmap failed");
return -1;
}
printf("rb = %X\n", rb);
rxi = rb;
rx_buf = rb + (rb_size.num_pages_rx_flags * page_size);
txi = rb + (rb_size.num_pages_rx_flags * page_size) +
(rb_size.num_rx_frames * page_size >> 1);
tx_buf = rb + (rb_size.num_pages_rx_flags * page_size) +
(rb_size.num_rx_frames * page_size >> 1) +
(rb_size.num_pages_tx_flags * page_size);
printf("rxi = %X, rx_buf = %X, txi = %X, tx_buf = %X\n", rxi, rx_buf, txi, tx_buf);
sched_setscheduler(0, SCHED_RR, &s);
error = 0;
#if 1
if (pthread_create(&rx, NULL, read_thread, (void *) t)) {
printf("Failed to create rx thread\n");
exit(-1);
}
sleep(1);
#endif
if (pthread_create(&tx, NULL, write_thread, (void *) t)) {
printf("Failed to create tx thread\n");
exit(-1);
}
// while (!error)
sleep(1000000000);
printf("Done sleeping\n");
}
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