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-rw-r--r--gr-wxgui/lib/oscope_guts.cc439
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diff --git a/gr-wxgui/lib/oscope_guts.cc b/gr-wxgui/lib/oscope_guts.cc
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--- a/gr-wxgui/lib/oscope_guts.cc
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-/* -*- c++ -*- */
-/*
- * Copyright 2003,2005,2013 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 GNU Radio; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <gnuradio/wxgui/oscope_guts.h>
-#include <stdexcept>
-#include <stdio.h>
-#include <algorithm>
-#include <unistd.h>
-#include <math.h>
-#include <assert.h>
-
-namespace gr {
- namespace wxgui {
-
- /*
- * Bad performance if it's large, and flaky triggering if it's too small
- */
- static const int OUTPUT_RECORD_SIZE = 1024; // Must be power of 2
-
- /*
- * For (slow-updated) STRIPCHART triggering, we make the record
- * size larger, since we potentially want to be able to "see"
- * hours of data. This works as long as the update rates to a
- * STRIPCHART are low, which they generally are--that's rather
- * what a stripchart is all about!
- */
- static const int SCHART_MULT = 8;
-
-
- static inline int
- wrap_bi(int buffer_index, int mx) // wrap buffer index
- {
- return buffer_index & (mx - 1);
- }
-
- static inline int
- incr_bi(int buffer_index, int mx) // increment buffer index
- {
- return wrap_bi(buffer_index + 1, mx);
- }
-
- static inline int
- decr_bi(int buffer_index, int mx) // decrement buffer index
- {
- return wrap_bi(buffer_index - 1, mx);
- }
-
- oscope_guts::oscope_guts(double sample_rate, msg_queue::sptr msgq)
- : d_nchannels(1),
- d_msgq(msgq),
- d_trigger_mode(TRIG_MODE_AUTO),
- d_trigger_slope(TRIG_SLOPE_POS),
- d_trigger_channel(0),
- d_sample_rate(sample_rate),
- d_update_rate(20),
- d_trigger_level(0),
- d_obi(0),
- d_state(HOLD_OFF),
- d_decimator_count(0),
- d_decimator_count_init(1),
- d_hold_off_count(0),
- d_hold_off_count_init(OUTPUT_RECORD_SIZE/2-1),
- d_pre_trigger_count(0),
- d_post_trigger_count(0),
- d_post_trigger_count_init(OUTPUT_RECORD_SIZE/2)
- {
- for(int i = 0; i < MAX_CHANNELS; i++)
- d_buffer[i] = 0;
-
- for(int i = 0; i < MAX_CHANNELS; i++) {
- d_buffer[i] = new float[OUTPUT_RECORD_SIZE*SCHART_MULT];
- for(int j = 0; j < OUTPUT_RECORD_SIZE*SCHART_MULT; j++)
- d_buffer[i][j] = 0.0;
- }
-
- // be sure buffer is full before first write
- enter_hold_off();
- update_rate_or_decimation_changed();
- }
-
- oscope_guts::~oscope_guts()
- {
- for(int i = 0; i < MAX_CHANNELS; i++)
- delete [] d_buffer[i];
- }
-
- // MANIPULATORS
- void
- oscope_guts::process_sample(const float *channel_data)
- {
- d_decimator_count--;
- if(d_decimator_count > 0)
- return;
-
- d_decimator_count = d_decimator_count_init;
-
- if(d_trigger_mode != TRIG_MODE_STRIPCHART) {
- for(int i = 0; i < d_nchannels; i++)
- d_buffer[i][d_obi] = channel_data[i]; // copy data into buffer
-
- switch(d_state) {
- case HOLD_OFF:
- d_hold_off_count--;
- if(d_hold_off_count <= 0)
- enter_look_for_trigger ();
- break;
-
- case LOOK_FOR_TRIGGER:
- if(found_trigger())
- enter_post_trigger();
- break;
-
- case POST_TRIGGER:
- d_post_trigger_count--;
- if(d_post_trigger_count <= 0) {
- write_output_records();
- enter_hold_off();
- }
- break;
-
- default:
- assert(0);
- }
-
- d_obi = incr_bi(d_obi, OUTPUT_RECORD_SIZE);
- }
- else {
- for(int i = 0; i < d_nchannels; i++) {
- for(int j = (OUTPUT_RECORD_SIZE*SCHART_MULT)-1; j > 0; j--) {
- d_buffer[i][j] = d_buffer[i][j-1];
- }
- d_buffer[i][0] = channel_data[i];
- }
- d_trigger_off = 0;
- write_output_records();
- }
- }
-
- /*
- * Functions called on state entry
- */
-
- void
- oscope_guts::enter_hold_off()
- {
- d_state = HOLD_OFF;
- d_hold_off_count = d_hold_off_count_init;
- }
-
- void
- oscope_guts::enter_look_for_trigger()
- {
- d_pre_trigger_count = 0;
- d_state = LOOK_FOR_TRIGGER;
- }
-
- void
- oscope_guts::enter_post_trigger()
- {
- d_state = POST_TRIGGER;
- d_post_trigger_count = d_post_trigger_count_init;
- //ensure that the trigger offset is no more than than half a sample
- if(d_trigger_off > .5)
- d_trigger_off -= 1;
- else
- d_post_trigger_count--;
- }
-
- // ----------------------------------------------------------------
- // returns true if trigger found
-
- bool
- oscope_guts::found_trigger()
- {
- int mx = d_trigger_mode == TRIG_MODE_STRIPCHART ? OUTPUT_RECORD_SIZE*SCHART_MULT :
- OUTPUT_RECORD_SIZE;
-
- float prev_sample = d_buffer[d_trigger_channel][decr_bi(d_obi, mx)];
- float new_sample = d_buffer[d_trigger_channel][d_obi];
-
- switch(d_trigger_mode) {
-
- case TRIG_MODE_AUTO: //too many samples without a trigger
- d_pre_trigger_count++;
- if(d_pre_trigger_count > OUTPUT_RECORD_SIZE/2)
- return true;
-
- case TRIG_MODE_NORM: //look for trigger
- switch(d_trigger_slope) {
-
- case TRIG_SLOPE_POS: //trigger point in pos slope?
- if(new_sample < d_trigger_level || prev_sample >= d_trigger_level)
- return false;
- break;
-
- case TRIG_SLOPE_NEG: //trigger point in neg slope?
- if(new_sample > d_trigger_level || prev_sample <= d_trigger_level)
- return false;
- break;
- }
-
- //calculate the trigger offset in % sample
- d_trigger_off = (d_trigger_level - prev_sample)/(new_sample - prev_sample);
- return true;
-
- case TRIG_MODE_FREE: //free run mode, always trigger
- d_trigger_off = 0;
- return true;
-
- default:
- assert(0);
- return false;
- }
- }
-
- // ----------------------------------------------------------------
- // write output records (duh!)
-
- void
- oscope_guts::write_output_records()
- {
- int mx;
-
- mx = d_trigger_mode == TRIG_MODE_STRIPCHART ?
- OUTPUT_RECORD_SIZE*SCHART_MULT : OUTPUT_RECORD_SIZE;
-
- // if the output queue if full, drop the data like its hot.
- if(d_msgq->full_p())
- return;
- // Build a message to hold the output records
- message::sptr msg =
- message::make(0, // msg type
- d_nchannels, // arg1 for other side
- mx, // arg2 for other side
- ((d_nchannels * mx) + 1) * sizeof(float)); // sizeof payload
-
- float *out = (float *)msg->msg(); // get pointer to raw message buffer
-
- for(int ch = 0; ch < d_nchannels; ch++) {
- // note that d_obi + 1 points at the oldest sample in the buffer
- for(int i = 0; i < mx; i++) {
- out[i] = d_buffer[ch][wrap_bi(d_obi + 1 + i, mx)];
- }
- out += mx;
- }
- //Set the last sample as the trigger offset:
- // The non gl scope sink will not look at this last sample.
- // The gl scope sink will use this last sample as an offset.
- out[0] = d_trigger_off;
- d_msgq->handle(msg); // send the msg
- }
-
- // ----------------------------------------------------------------
-
- bool
- oscope_guts::set_update_rate(double update_rate)
- {
- d_update_rate = std::min(std::max (1./10., update_rate), d_sample_rate);
- update_rate_or_decimation_changed();
- return true;
- }
-
- bool
- oscope_guts::set_decimation_count(int decimator_count)
- {
- decimator_count = std::max(1, decimator_count);
- d_decimator_count_init = decimator_count;
- update_rate_or_decimation_changed();
- return true;
- }
-
- bool
- oscope_guts::set_sample_rate(double sample_rate)
- {
- d_sample_rate = sample_rate;
- return set_update_rate(update_rate());
- }
-
- void
- oscope_guts::update_rate_or_decimation_changed()
- {
- d_hold_off_count_init =
- (int)rint(d_sample_rate / d_update_rate / d_decimator_count_init);
- }
-
- bool
- oscope_guts::set_trigger_channel(int channel)
- {
- if(channel >= 0 && channel < d_nchannels) {
- d_trigger_channel = channel;
- trigger_changed ();
- return true;
- }
-
- return false;
- }
-
- bool
- oscope_guts::set_trigger_mode(trigger_mode mode)
- {
- d_trigger_mode = mode;
- trigger_changed();
- return true;
- }
-
- bool
- oscope_guts::set_trigger_slope(trigger_slope slope)
- {
- d_trigger_slope = slope;
- trigger_changed();
- return true;
- }
-
- bool
- oscope_guts::set_trigger_level(double trigger_level)
- {
- d_trigger_level = trigger_level;
- trigger_changed();
- return true;
- }
-
- bool
- oscope_guts::set_trigger_level_auto()
- {
- // find the level 1/2 way between the min and the max
-
- float min_v = d_buffer[d_trigger_channel][0];
- float max_v = d_buffer[d_trigger_channel][0];
-
- for(int i = 1; i < OUTPUT_RECORD_SIZE; i++) {
- min_v = std::min (min_v, d_buffer[d_trigger_channel][i]);
- max_v = std::max (max_v, d_buffer[d_trigger_channel][i]);
- }
- return set_trigger_level((min_v + max_v) * 0.5);
- }
-
- bool
- oscope_guts::set_num_channels(int nchannels)
- {
- if(nchannels > 0 && nchannels <= MAX_CHANNELS) {
- d_nchannels = nchannels;
- return true;
- }
- return false;
- }
-
- void
- oscope_guts::trigger_changed()
- {
- enter_look_for_trigger();
- }
-
- // ACCESSORS
-
- int
- oscope_guts::num_channels() const
- {
- return d_nchannels;
- }
-
- double
- oscope_guts::sample_rate() const
- {
- return d_sample_rate;
- }
-
- double
- oscope_guts::update_rate() const
- {
- return d_update_rate;
- }
-
- int
- oscope_guts::get_decimation_count() const
- {
- return d_decimator_count_init;
- }
-
- int
- oscope_guts::get_trigger_channel() const
- {
- return d_trigger_channel;
- }
-
- trigger_mode
- oscope_guts::get_trigger_mode() const
- {
- return d_trigger_mode;
- }
-
- trigger_slope
- oscope_guts::get_trigger_slope() const
- {
- return d_trigger_slope;
- }
-
- double
- oscope_guts::get_trigger_level() const
- {
- return d_trigger_level;
- }
-
- int
- oscope_guts::get_samples_per_output_record() const
- {
- int mx;
-
- mx = OUTPUT_RECORD_SIZE;
- if(d_trigger_mode == TRIG_MODE_STRIPCHART) {
- mx = OUTPUT_RECORD_SIZE*SCHART_MULT;
- }
- return mx;
- }
-
- } /* namespace wxgui */
-} /* namespace gr */