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/* -*- c++ -*- */
/*
* Copyright 2007,2008 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <usrp_rx_stub.h>
#include <iostream>
#include <vector>
#include <usb.h>
#include <mblock/class_registry.h>
#include <usrp_inband_usb_packet.h>
#include <fpga_regs_common.h>
#include "usrp_standard.h"
#include <stdio.h>
#include <string.h>
#include <ui_nco.h>
#include <fstream>
#include <symbols_usrp_rx_cs.h>
typedef usrp_inband_usb_packet transport_pkt;
static const bool verbose = false;
bool usrp_rx_stop_stub;
// Used for the fake control packet response code to send the responses back up
// the RX. The TX stub dumps responses in to this queue.
std::queue<pmt_t> d_cs_queue;
usrp_rx_stub::usrp_rx_stub(mb_runtime *rt, const std::string &instance_name, pmt_t user_arg)
: mb_mblock(rt, instance_name, user_arg),
d_samples_per_frame((long)(126)),
d_decim_rx(128),
d_amplitude(16384),
d_disk_write(false)
{
// Information about the rates are passed all the way from the app in the form
// of a dictionary. We use this to read the RX decimation rate and compute
// the approximate number of MS/s as a form of flow control for the stub.
pmt_t usrp_dict = user_arg;
if (pmt_is_dict(usrp_dict)) {
// Read the RX decimation rate
if(pmt_t decim_rx = pmt_dict_ref(usrp_dict,
pmt_intern("decim-rx"),
PMT_NIL)) {
if(!pmt_eqv(decim_rx, PMT_NIL))
d_decim_rx = pmt_to_long(decim_rx);
}
}
d_cs = define_port("cs", "usrp-rx-cs", true, mb_port::EXTERNAL);
// initialize NCO
double freq = 100e3;
int interp = 32; // 32 -> 4MS/s
double sample_rate = 64e6 / interp;
d_nco.set_freq(2*M_PI * freq/sample_rate);
//d_disk_write = true;
if(d_disk_write)
d_ofile.open("raw_rx.dat",std::ios::binary|std::ios::out);
usrp_rx_stop_stub = false;
}
usrp_rx_stub::~usrp_rx_stub()
{
if(d_disk_write)
d_ofile.close();
}
void
usrp_rx_stub::initial_transition()
{
}
void
usrp_rx_stub::handle_message(mb_message_sptr msg)
{
pmt_t event = msg->signal();
pmt_t port_id = msg->port_id();
pmt_t data = msg->data();
if (pmt_eq(msg->signal(), s_timeout)
&& !pmt_eq(msg->data(), s_done)) {
if(!usrp_rx_stop_stub)
read_and_respond();
else { // requested to stop
cancel_timeout(msg->metadata());
usrp_rx_stop_stub=false;
if(verbose)
std::cout << "[USRP_RX_STUB] Stopping RX stub\n";
}
}
// Theoretically only have 1 message to ever expect, but
// want to make sure its at least what we want
if(pmt_eq(port_id, d_cs->port_symbol())
&& pmt_eqv(event, s_cmd_usrp_rx_start_reading)) {
if(verbose)
std::cout << "[USRP_RX_STUB] Starting with decim @ "
<< d_decim_rx << std::endl;
start_packet_timer();
}
}
// Setup a periodic timer which will drive packet generation
void
usrp_rx_stub::start_packet_timer()
{
d_t0 = mb_time::time(); // current time
// Calculate the inter-packet arrival time.
double samples_per_sec = (64.0/(double)d_decim_rx)*1000000.0;
double frames_per_sec = samples_per_sec / (double)d_samples_per_frame;
double frame_rate = 1.0 / frames_per_sec;
if(verbose) {
std::cout << "[USRP_RX_STUB] Scheduling periodic packet generator\n";
std::cout << "\tsamples_per_sec: " << samples_per_sec << std::endl;
std::cout << "\tframes_per_sec: " << frames_per_sec << std::endl;
std::cout << "\tframe_rate: " << frame_rate << std::endl;
}
schedule_periodic_timeout(d_t0 + frame_rate, mb_time(frame_rate), PMT_T);
}
void
usrp_rx_stub::read_and_respond()
{
long nsamples_this_frame = d_samples_per_frame;
size_t nshorts = 2 * nsamples_this_frame; // 16-bit I & Q
long channel = 0;
long n_bytes = nshorts*2;
pmt_t uvec = pmt_make_s16vector(nshorts, 0);
size_t ignore;
int16_t *samples = pmt_s16vector_writable_elements(uvec, ignore);
// fill in the complex sinusoid
for (int i = 0; i < nsamples_this_frame; i++){
if (1){
gr_complex s;
d_nco.sincos(&s, 1, d_amplitude);
// write 16-bit i & q
samples[2*i] = (int16_t) s.real();
samples[2*i+1] = (int16_t) s.imag();
}
else {
gr_complex s(d_amplitude, d_amplitude);
// write 16-bit i & q
samples[2*i] = (int16_t) s.real();
samples[2*i+1] = (int16_t) s.imag();
}
}
if(d_disk_write)
d_ofile.write((const char *)samples, n_bytes);
pmt_t v_pkt = pmt_make_u8vector(sizeof(transport_pkt), 0);
transport_pkt *pkt =
(transport_pkt *) pmt_u8vector_writable_elements(v_pkt, ignore);
pkt->set_header(0, channel, 0, n_bytes);
pkt->set_timestamp(0xffffffff);
memcpy(pkt->payload(), samples, n_bytes);
d_cs->send(s_response_usrp_rx_read, pmt_list3(PMT_NIL, PMT_T, v_pkt));
// Now lets check the shared CS queue between the TX and RX stub. Each
// element in a queue is a list where the first element is an invocation
// handle and the second element is a PMT u8 vect representation of the
// CS packet response which can just be passed transparently.
while(!d_cs_queue.empty()) {
pmt_t cs_pkt = d_cs_queue.front();
d_cs_queue.pop();
pmt_t invocation_handle = pmt_nth(0, cs_pkt);
pmt_t v_pkt = pmt_nth(1, cs_pkt);
d_cs->send(s_response_usrp_rx_read,
pmt_list3(invocation_handle,
PMT_T,
v_pkt)); // Take the front CS pkt
if(verbose)
std::cout << "[USRP_RX_STUB] Received CS response from TX stub\n";
}
}
REGISTER_MBLOCK_CLASS(usrp_rx_stub);
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