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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;
struct usrp_transfer_frame *rx_data;
struct pkt *p;
int rx_pkt_cnt;
int i;
printf("Greetings from the reading thread!\n");
// 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;
rx_pkt_cnt = 0;
while (1) {
cnt = read(fp, rx_data, 2048);
if (cnt < 0)
printf("Error returned from read: %d\n", cnt);
rx_pkt_cnt++;
if (rx_pkt_cnt == 512) {
printf(".");
fflush(stdout);
rx_pkt_cnt = 0;
}
if (rx_data->flags & RB_OVERRUN)
printf("O");
// for (i = 0; i < 10; i++)
// printf(" %d", p->data[i]);
// printf("\n");
// printf("Packet received, flags = %X, len = %d\n", rx_data->flags, rx_data->len);
// printf("p->seq_num = %d\n", p->seq_num);
// if (p->seq_num != prev_seq_num + 1)
// printf("Sequence number fail, current = %X, previous = %X\n",
// p->seq_num, prev_seq_num);
// prev_seq_num = p->seq_num;
// if (calc_checksum(p) != p->checksum)
// printf("Checksum fail packet = %X, expected = %X\n",
// calc_checksum(p), p->checksum);
// printf("\n");
}
}
static void *write_thread(void *threadid)
{
int seq_number, i, cnt, tx_pkt_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 = 0;
tx_data->len = 8 + packet_data_length * 2;
printf("tx_data->len = %d\n", tx_data->len);
seq_number = 1;
tx_pkt_cnt = 0;
while (1) {
tx_pkt_cnt++;
if (tx_pkt_cnt == 512) {
printf(".");
fflush(stdout);
}
if (tx_pkt_cnt == 1024) {
printf("'");
fflush(stdout);
}
if (tx_pkt_cnt == 1536) {
printf(":");
fflush(stdout);
tx_pkt_cnt = 0;
}
// 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;
int fpga_config_flag ,decimation;
struct usrp_e_ctl16 d;
struct sched_param s = {
.sched_priority = 1
};
if (argc < 4) {
printf("%s t|w|rw decimation data_size\n", argv[0]);
return -1;
}
decimation = atoi(argv[2]);
packet_data_length = atoi(argv[3]);
fp = open("/dev/usrp_e0", O_RDWR);
printf("fp = %d\n", fp);
fpga_config_flag = 0;
if (strcmp(argv[1], "w") == 0)
fpga_config_flag |= (1 << 15);
else if (strcmp(argv[1], "r") == 0)
fpga_config_flag |= (1 << 14);
else if (strcmp(argv[1], "rw") == 0)
fpga_config_flag |= ((1 << 15) | (1 << 14));
fpga_config_flag |= decimation;
d.offset = 14;
d.count = 1;
d.buf[0] = fpga_config_flag;
ioctl(fp, USRP_E_WRITE_CTL16, &d);
sleep(1); // in case the kernel threads need time to start. FIXME if so
sched_setscheduler(0, SCHED_RR, &s);
if (fpga_config_flag & (1 << 14)) {
if (pthread_create(&rx, NULL, read_thread, (void *) t)) {
printf("Failed to create rx thread\n");
exit(-1);
}
}
sleep(1);
if (fpga_config_flag & (1 << 15)) {
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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