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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 <sys/mman.h>
#include <linux/usrp_e.h>
#define MAX_PACKET_SIZE 1016
static int packet_data_length;
static int error;
struct pkt {
int len;
int checksum;
int seq_num;
short data[];
};
static int length_array[2048];
static int length_array_tail = 0;
static int length_array_head = 0;
pthread_mutex_t length_array_mutex; //gotta lock the index to keep it from getting hosed
//yes this is a circular buffer that does not check empty
//no i don't want to hear about it
void push_length_array(int length) {
pthread_mutex_lock(&length_array_mutex);
if(length_array_tail > 2047) length_array_tail = 0;
length_array[length_array_tail++] = length;
pthread_mutex_unlock(&length_array_mutex);
}
int pop_length_array(void) {
int retval;
pthread_mutex_lock(&length_array_mutex);
if(length_array_head > 2047) length_array_head = 0;
retval = length_array[length_array_head++];
pthread_mutex_unlock(&length_array_mutex);
return retval;
}
static int fp;
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)
{
char *rx_data;
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 expected_count;
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(2048);
p = (struct pkt *) ((void *)rx_data);
prev_seq_num = 0;
pkt_count = 0;
seq_num_failure = 0;
while (1) {
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->seq_num = %d\n", p->seq_num);
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);
seq_num_failure ++;
if (seq_num_failure > 2)
error = 1;
}
expected_count = pop_length_array()*2+12;
if(cnt != expected_count) {
printf("Received %d bytes, expected %d\n", cnt, expected_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);
error = 1;
}
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;
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;
while (1) {
p->seq_num = seq_number++;
if (packet_data_length > 0)
p->len = packet_data_length;
else
p->len = (random()<<1 & 0x1ff) + (1004 - 512);
push_length_array(p->len);
p->checksum = calc_checksum(p);
cnt = write(fp, tx_data, p->len * 2 + 12);
if (cnt < 0)
printf("Error returned from write: %d\n", cnt);
// sleep(1);
}
}
int main(int argc, char *argv[])
{
pthread_t tx, rx;
pthread_mutex_init(&length_array_mutex, 0);
long int t;
struct sched_param s = {
.sched_priority = 1
};
void *rb;
struct usrp_transfer_frame *tx_rb, *rx_rb;
if (argc < 2) {
printf("%s data_size\n", argv[0]);
return -1;
}
packet_data_length = atoi(argv[1]);
if(packet_data_length > MAX_PACKET_SIZE) {
printf("Packet size must be smaller than %i\n", MAX_PACKET_SIZE);
exit(-1);
}
fp = open("/dev/usrp_e0", O_RDWR);
printf("fp = %d\n", fp);
rb = mmap(0, 202 * 4096, PROT_READ|PROT_WRITE, MAP_SHARED, fp, 0);
if (!rb) {
printf("mmap failed\n");
exit;
}
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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