3 * Copyright 2003,2005 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
24 #ifndef INCLUDED_GR_OSCOPE_GUTS_H
25 #define INCLUDED_GR_OSCOPE_GUTS_H
27 #include <gr_trigger_mode.h>
28 #include <gr_msg_queue.h>
31 * \brief guts of oscilloscope trigger and buffer module
33 * This module processes sets of samples provided the \p process_sample
34 * method. When appropriate given the updateRate, sampleRate and
35 * trigger conditions, process_sample will periodically write output
36 * records of captured data to output_fd. For each trigger event,
37 * nchannels records will be written. Each record consists of
38 * get_samples_per_output_record binary floats. The trigger instant
39 * occurs at the 1/2 way point in the buffer. Thus, output records
40 * consist of 50% pre-trigger data and 50% post-trigger data.
43 class gr_oscope_guts {
45 static const int MAX_CHANNELS = 8;
47 enum scope_state { HOLD_OFF, LOOK_FOR_TRIGGER, POST_TRIGGER };
49 int d_nchannels; // how many channels
50 gr_msg_queue_sptr d_msgq; // message queue we stuff output records into
51 gr_trigger_mode d_trigger_mode;
52 gr_trigger_slope d_trigger_slope;
53 int d_trigger_channel; // which channel to watch for trigger condition
54 double d_sample_rate; // input sample rate in Hz
55 double d_update_rate; // approx freq to produce an output record (Hz)
56 double d_trigger_level;
58 int d_obi; // output buffer index
59 float *d_buffer[MAX_CHANNELS];
62 int d_decimator_count;
63 int d_decimator_count_init;
65 int d_hold_off_count_init;
66 int d_pre_trigger_count;
67 int d_post_trigger_count;
68 int d_post_trigger_count_init;
69 float d_trigger_off; //%sample trigger is off
72 gr_oscope_guts (const gr_oscope_guts &rhs); // no copy constructor
73 gr_oscope_guts &operator= (const gr_oscope_guts &rhs); // no assignment operator
75 void trigger_changed ();
76 void update_rate_or_decimation_changed ();
77 bool found_trigger (); // returns true if found
78 void write_output_records ();
80 void enter_hold_off (); // called on state entry
81 void enter_look_for_trigger ();
82 void enter_post_trigger ();
86 gr_oscope_guts (double sample_rate, gr_msg_queue_sptr msgq);
92 * \p channel_data points to nchannels float values. These are the values
93 * for each channel at this sample time.
95 void process_sample (const float *channel_data);
97 bool set_update_rate (double update_rate);
98 bool set_decimation_count (int decimation_count);
99 bool set_trigger_channel (int channel);
100 bool set_trigger_mode (gr_trigger_mode mode);
101 bool set_trigger_slope (gr_trigger_slope slope);
102 bool set_trigger_level (double trigger_level);
103 bool set_trigger_level_auto (); // set to 50% level
104 bool set_sample_rate(double sample_rate);
105 bool set_num_channels(int nchannels);
109 int num_channels () const;
110 double sample_rate () const;
111 double update_rate () const;
112 int get_decimation_count () const;
113 int get_trigger_channel () const;
114 gr_trigger_mode get_trigger_mode () const;
115 gr_trigger_slope get_trigger_slope () const;
116 double get_trigger_level () const;
118 // # of samples written to each output record.
119 int get_samples_per_output_record () const;
122 #endif /* INCLUDED_GR_OSCOPE_GUTS_H */