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23 #ifndef INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H
24 #define INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H
28 class gr_align_on_samplenumbers_ss;
29 typedef boost::shared_ptr<gr_align_on_samplenumbers_ss> gr_align_on_samplenumbers_ss_sptr;
31 gr_align_on_samplenumbers_ss_sptr gr_make_align_on_samplenumbers_ss (int nchan=2, int align_interval=128);
34 * \brief align several complex short (interleaved short) input channels with corresponding unsigned 32 bit sample_counters (provided as interleaved 16 bit values)
35 * \param number of complex_short input channels (including the 32 bit counting channel)
36 * \param align_interval is after how much samples (minimally) the sample-alignement is refreshed. Default is 128.
37 * A bigger value means less processing power but also requests more buffer space, which has a maximum.
38 * Decrease the align_interval if you get an error like:
39 * "sched: <gr_block align_on_samplenumbers_ss (0)> is requesting more input data than we can provide.
40 * ninput_items_required = 32768
41 * max_possible_items_available = 16383
42 * If this is a filter, consider reducing the number of taps."
44 * Pay attention on how you connect this block.
45 * It expects a minimum of 2 usrp_source_s with nchan number of channels and FPGA_MODE_COUNTING_32BIT enabled.
46 * This means that the first complex_short channel on every input is an interleaved 32 bit counter.
47 * The samples are aligned by dropping samples untill the samplenumbers match.
51 class gr_align_on_samplenumbers_ss : public gr_block
57 unsigned int d_ninputs;
60 unsigned int ucounter_end;
61 unsigned int ucounter_begin;
69 int ninput_items_used;
71 std::vector<align_state> d_state;
73 friend gr_align_on_samplenumbers_ss_sptr gr_make_align_on_samplenumbers_ss (int nchan,int align_interval);
74 gr_align_on_samplenumbers_ss (int nchan,int align_interval);
77 ~gr_align_on_samplenumbers_ss();
78 bool check_topology (int ninputs, int noutputs);
79 void forecast (int noutput_items,
80 gr_vector_int &ninput_items_required);
82 int general_work (int noutput_items,
83 gr_vector_int &ninput_items,
84 gr_vector_const_void_star &input_items,
85 gr_vector_void_star &output_items);
89 #endif /* INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H */