FGFS-4.1/gr-air-modes
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Convert next branch to 3.7 API. Based on Johnathan Corgan's 3.7 conversion of

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the master branch.
This commit is contained in:
Nick Foster
2013-07-17 18:03:45 -07:00
parent fbe3c464fb
commit 0ce6374656
14 changed files with 82 additions and 162 deletions
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lib/air_modes_preamble.cc
+22 -37
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@@ -27,10 +27,10 @@
#include <ciso646>
#include <air_modes_preamble.h>
#include <gr_io_signature.h>
#include <gnuradio/io_signature.h>
#include <string.h>
#include <iostream>
#include <gr_tags.h>
#include <gnuradio/tags.h>
air_modes_preamble_sptr air_make_modes_preamble(int channel_rate, float threshold_db)
{
@@ -38,39 +38,24 @@ air_modes_preamble_sptr air_make_modes_preamble(int channel_rate, float threshol
}
air_modes_preamble::air_modes_preamble(int channel_rate, float threshold_db) :
gr_block ("modes_preamble",
gr_make_io_signature2 (2, 2, sizeof(float), sizeof(float)), //stream 0 is received data, stream 1 is moving average for reference
gr_make_io_signature (1, 1, sizeof(float))) //the output packets
{
set_rate(channel_rate);
set_threshold(threshold_db);
std::stringstream str;
str << name() << unique_id();
d_me = pmt::pmt_string_to_symbol(str.str());
d_key = pmt::pmt_string_to_symbol("preamble_found");
set_history(d_samples_per_symbol);
}
void air_modes_preamble::set_rate(int channel_rate)
gr::block ("modes_preamble",
gr::io_signature::make2 (2, 2, sizeof(float), sizeof(float)), //stream 0 is received data, stream 1 is moving average for reference
gr::io_signature::make (1, 1, sizeof(float))) //the output packets
{
d_chip_rate = 2000000; //2Mchips per second
d_samples_per_chip = channel_rate / d_chip_rate; //must be integer number of samples per chip to work
d_samples_per_symbol = d_samples_per_chip * 2;
d_secs_per_sample = 1.0 / channel_rate;
d_check_width = 240 * d_samples_per_symbol; //only search to this far from the end of the stream buffer
set_output_multiple(1+d_check_width);
}
void air_modes_preamble::set_threshold(float threshold_db)
{
d_check_width = 120 * d_samples_per_symbol; //only search to this far from the end of the stream buffer
d_threshold_db = threshold_db;
d_threshold = powf(10., threshold_db/20.); //the level that the sample must be above the moving average in order to qualify as a pulse
}
float air_modes_preamble::get_threshold(void)
{
return d_threshold_db;
d_secs_per_sample = 1.0 / channel_rate;
set_output_multiple(1+d_check_width*2);
std::stringstream str;
str << name() << unique_id();
d_me = pmt::string_to_symbol(str.str());
d_key = pmt::string_to_symbol("preamble_found");
set_history(d_samples_per_symbol);
}
static void integrate_and_dump(float *out, const float *in, int chips, int samps_per_chip) {
@@ -96,14 +81,14 @@ static double correlate_preamble(const float *in, int samples_per_chip) {
}
//todo: make it return a pair of some kind, otherwise you can lose precision
static double tag_to_timestamp(gr_tag_t tstamp, uint64_t abs_sample_cnt, double secs_per_sample) {
static double tag_to_timestamp(gr::tag_t tstamp, uint64_t abs_sample_cnt, double secs_per_sample) {
uint64_t ts_sample, last_whole_stamp;
double last_frac_stamp;
if(tstamp.key == NULL || pmt::pmt_symbol_to_string(tstamp.key) != "rx_time") return 0;
if(tstamp.key == NULL || pmt::symbol_to_string(tstamp.key) != "rx_time") return 0;
last_whole_stamp = pmt::pmt_to_uint64(pmt::pmt_tuple_ref(tstamp.value, 0));
last_frac_stamp = pmt::pmt_to_double(pmt::pmt_tuple_ref(tstamp.value, 1));
last_whole_stamp = pmt::to_uint64(pmt::tuple_ref(tstamp.value, 0));
last_frac_stamp = pmt::to_double(pmt::tuple_ref(tstamp.value, 1));
ts_sample = tstamp.offset;
double tstime = double(abs_sample_cnt * secs_per_sample) + last_whole_stamp + last_frac_stamp;
@@ -137,8 +122,8 @@ int air_modes_preamble::general_work(int noutput_items,
};
uint64_t abs_sample_cnt = nitems_read(0);
std::vector<gr_tag_t> tstamp_tags;
get_tags_in_range(tstamp_tags, 0, abs_sample_cnt, abs_sample_cnt + ninputs, pmt::pmt_string_to_symbol("rx_time"));
std::vector<gr::tag_t> tstamp_tags;
get_tags_in_range(tstamp_tags, 0, abs_sample_cnt, abs_sample_cnt + ninputs, pmt::string_to_symbol("rx_time"));
//tags.back() is the most recent timestamp, then.
if(tstamp_tags.size() > 0) {
d_timestamp = tstamp_tags.back();
@@ -210,10 +195,10 @@ int air_modes_preamble::general_work(int noutput_items,
add_item_tag(0, //stream ID
nitems_written(0), //sample
d_key, //frame_info
pmt::pmt_make_tuple(pmt::pmt_from_double(tstamp), pmt::pmt_from_double(inavg[i])),
pmt::from_double(tstamp),
d_me //block src id
);
//std::cout << "PREAMBLE" << std::endl;
//produce only one output per work call -- TODO this should probably change