GNU Radio Manual and C++ API Reference  3.10.9.1
The Free & Open Software Radio Ecosystem
gr::uhd::usrp_sink Class Referenceabstract

#include <gnuradio/uhd/usrp_sink.h>

Public Types

typedef std::shared_ptr< usrp_sinksptr
 
- Public Types inherited from gr::block
enum  work_return_t { WORK_CALLED_PRODUCE = -2 , WORK_DONE = -1 }
 Magic return values from general_work. More...
 
enum  tag_propagation_policy_t { TPP_DONT = 0 , TPP_ALL_TO_ALL = 1 , TPP_ONE_TO_ONE = 2 , TPP_CUSTOM = 3 }
 enum to represent different tag propagation policies. More...
 

Public Member Functions

virtual void set_start_time (const ::uhd::time_spec_t &time)=0
 
virtual std::vector< std::string > get_lo_names (size_t chan=0)=0
 
virtual void set_lo_source (const std::string &src, const std::string &name, size_t chan=0)=0
 
virtual const std::string get_lo_source (const std::string &name, size_t chan=0)=0
 
virtual std::vector< std::string > get_lo_sources (const std::string &name, size_t chan=0)=0
 
virtual void set_lo_export_enabled (bool enabled, const std::string &name, size_t chan=0)=0
 
virtual bool get_lo_export_enabled (const std::string &name, size_t chan=0)=0
 
virtual double set_lo_freq (double freq, const std::string &name, size_t chan=0)=0
 
virtual double get_lo_freq (const std::string &name, size_t chan=0)=0
 
virtual ::uhd::freq_range_t get_lo_freq_range (const std::string &name, size_t chan=0)=0
 
virtual void set_dc_offset (const std::complex< double > &offset, size_t chan=0)=0
 
virtual void set_iq_balance (const std::complex< double > &correction, size_t chan=0)=0
 
- Public Member Functions inherited from gr::uhd::usrp_block
virtual void set_subdev_spec (const std::string &spec, size_t mboard=0)=0
 
virtual std::string get_subdev_spec (size_t mboard=0)=0
 
virtual size_t get_num_mboards ()=0
 
virtual void set_samp_rate (double rate)=0
 
virtual double get_samp_rate (void)=0
 
virtual ::uhd::meta_range_t get_samp_rates (void)=0
 
virtual ::uhd::tune_result_t set_center_freq (const ::uhd::tune_request_t tune_request, size_t chan=0)=0
 
::uhd::tune_result_t set_center_freq (double freq, size_t chan=0)
 
virtual double get_center_freq (size_t chan=0)=0
 
virtual ::uhd::freq_range_t get_freq_range (size_t chan=0)=0
 
virtual void set_gain (double gain, size_t chan=0, pmt::pmt_t direction=pmt::PMT_NIL)=0
 
virtual void set_gain (double gain, const std::string &name, size_t chan=0)=0
 
virtual void set_normalized_gain (double norm_gain, size_t chan=0)=0
 
virtual double get_gain (size_t chan=0)=0
 
virtual double get_gain (const std::string &name, size_t chan=0)=0
 
virtual double get_normalized_gain (size_t chan=0)=0
 
virtual std::vector< std::string > get_gain_names (size_t chan=0)=0
 
virtual ::uhd::gain_range_t get_gain_range (size_t chan=0)=0
 
virtual ::uhd::gain_range_t get_gain_range (const std::string &name, size_t chan=0)=0
 
virtual bool has_power_reference (size_t chan=0)=0
 
virtual void set_power_reference (double power_dbm, size_t chan=0)=0
 
virtual double get_power_reference (size_t chan=0)=0
 
virtual ::uhd::meta_range_t get_power_range (size_t chan=0)=0
 
virtual void set_antenna (const std::string &ant, size_t chan=0)=0
 
virtual std::string get_antenna (size_t chan=0)=0
 
virtual std::vector< std::string > get_antennas (size_t chan=0)=0
 
virtual void set_bandwidth (double bandwidth, size_t chan=0)=0
 
virtual double get_bandwidth (size_t chan=0)=0
 
virtual ::uhd::freq_range_t get_bandwidth_range (size_t chan=0)=0
 
virtual ::uhd::sensor_value_t get_sensor (const std::string &name, size_t chan=0)=0
 
virtual std::vector< std::string > get_sensor_names (size_t chan=0)=0
 
::uhd::sensor_value_t get_dboard_sensor (const std::string &name, size_t chan=0)
 DEPRECATED use get_sensor. More...
 
std::vector< std::string > get_dboard_sensor_names (size_t chan=0)
 DEPRECATED use get_sensor_names. More...
 
virtual ::uhd::sensor_value_t get_mboard_sensor (const std::string &name, size_t mboard=0)=0
 
virtual std::vector< std::string > get_mboard_sensor_names (size_t mboard=0)=0
 
virtual std::string get_time_source (const size_t mboard)=0
 
virtual std::vector< std::string > get_time_sources (const size_t mboard)=0
 
virtual void set_clock_source (const std::string &source, const size_t mboard=0)=0
 
virtual std::string get_clock_source (const size_t mboard)=0
 
virtual std::vector< std::string > get_clock_sources (const size_t mboard)=0
 
virtual double get_clock_rate (size_t mboard=0)=0
 
virtual void set_clock_rate (double rate, size_t mboard=0)=0
 
virtual ::uhd::time_spec_t get_time_now (size_t mboard=0)=0
 
virtual ::uhd::time_spec_t get_time_last_pps (size_t mboard=0)=0
 
virtual void set_time_now (const ::uhd::time_spec_t &time_spec, size_t mboard=0)=0
 
virtual void set_time_next_pps (const ::uhd::time_spec_t &time_spec)=0
 
virtual void set_time_unknown_pps (const ::uhd::time_spec_t &time_spec)=0
 
virtual void set_command_time (const ::uhd::time_spec_t &time_spec, size_t mboard=0)=0
 
virtual void clear_command_time (size_t mboard=0)=0
 
virtual ::uhd::usrp::dboard_iface::sptr get_dboard_iface (size_t chan=0)=0
 
virtual ::uhd::usrp::multi_usrp::sptr get_device (void)=0
 
virtual void set_user_register (const uint8_t addr, const uint32_t data, size_t mboard=0)=0
 
virtual void set_time_source (const std::string &source, const size_t mboard=0)=0
 
virtual void set_stream_args (const ::uhd::stream_args_t &stream_args)=0
 
virtual std::vector< std::string > get_gpio_banks (const size_t mboard)=0
 
virtual void set_gpio_attr (const std::string &bank, const std::string &attr, const uint32_t value, const uint32_t mask=0xffffffff, const size_t mboard=0)=0
 
virtual uint32_t get_gpio_attr (const std::string &bank, const std::string &attr, const size_t mboard=0)=0
 
virtual std::vector< std::string > get_filter_names (const size_t chan=0)=0
 
virtual void set_filter (const std::string &path, ::uhd::filter_info_base::sptr filter, const size_t chan=0)=0
 
virtual ::uhd::filter_info_base::sptr get_filter (const std::string &path, const size_t chan=0)=0
 
virtual ::uhd::dict< std::string, std::string > get_usrp_info (size_t chan=0)=0
 
- Public Member Functions inherited from gr::sync_block
virtual int work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)=0
 just like gr::block::general_work, only this arranges to call consume_each for you More...
 
void forecast (int noutput_items, gr_vector_int &ninput_items_required) override
 Estimate input requirements given output request. More...
 
int general_work (int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items) override
 compute output items from input items More...
 
int fixed_rate_ninput_to_noutput (int ninput) override
 Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. More...
 
int fixed_rate_noutput_to_ninput (int noutput) override
 Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. More...
 
- Public Member Functions inherited from gr::block
 ~block () override
 
unsigned history () const
 
void set_history (unsigned history)
 
void declare_sample_delay (int which, unsigned delay)
 
void declare_sample_delay (unsigned delay)
 
unsigned sample_delay (int which) const
 
bool fixed_rate () const
 Return true if this block has a fixed input to output rate. More...
 
virtual bool start ()
 Called to enable drivers, etc for i/o devices. More...
 
virtual bool stop ()
 Called to disable drivers, etc for i/o devices. More...
 
void set_output_multiple (int multiple)
 Constrain the noutput_items argument passed to forecast and general_work. More...
 
int output_multiple () const
 
bool output_multiple_set () const
 
void set_alignment (int multiple)
 Constrains buffers to work on a set item alignment (for SIMD) More...
 
int alignment () const
 
void set_unaligned (int na)
 
int unaligned () const
 
void set_is_unaligned (bool u)
 
bool is_unaligned () const
 
void consume (int which_input, int how_many_items)
 Tell the scheduler how_many_items of input stream which_input were consumed. More...
 
void consume_each (int how_many_items)
 Tell the scheduler how_many_items were consumed on each input stream. More...
 
void produce (int which_output, int how_many_items)
 Tell the scheduler how_many_items were produced on output stream which_output. More...
 
void set_relative_rate (double relative_rate)
 Set the approximate output rate / input rate. More...
 
void set_inverse_relative_rate (double inverse_relative_rate)
 Set the approximate output rate / input rate using its reciprocal. More...
 
void set_relative_rate (uint64_t interpolation, uint64_t decimation)
 Set the approximate output rate / input rate as an integer ratio. More...
 
double relative_rate () const
 return the approximate output rate / input rate More...
 
uint64_t relative_rate_i () const
 return the numerator, or interpolation rate, of the approximate output rate / input rate More...
 
uint64_t relative_rate_d () const
 return the denominator, or decimation rate, of the approximate output rate / input rate More...
 
mpq_class & mp_relative_rate ()
 return a reference to the multiple precision rational representation of the approximate output rate / input rate More...
 
uint64_t nitems_read (unsigned int which_input)
 Return the number of items read on input stream which_input. More...
 
uint64_t nitems_written (unsigned int which_output)
 Return the number of items written on output stream which_output. More...
 
tag_propagation_policy_t tag_propagation_policy ()
 Asks for the policy used by the scheduler to moved tags downstream. More...
 
void set_tag_propagation_policy (tag_propagation_policy_t p)
 Set the policy by the scheduler to determine how tags are moved downstream. More...
 
int min_noutput_items () const
 Return the minimum number of output items this block can produce during a call to work. More...
 
void set_min_noutput_items (int m)
 Set the minimum number of output items this block can produce during a call to work. More...
 
int max_noutput_items ()
 Return the maximum number of output items this block will handle during a call to work. More...
 
void set_max_noutput_items (int m)
 Set the maximum number of output items this block will handle during a call to work. More...
 
void unset_max_noutput_items ()
 Clear the switch for using the max_noutput_items value of this block. More...
 
bool is_set_max_noutput_items ()
 Ask the block if the flag is or is not set to use the internal value of max_noutput_items during a call to work. More...
 
void expand_minmax_buffer (int port)
 
long max_output_buffer (size_t i)
 Returns max buffer size on output port i. More...
 
void set_max_output_buffer (long max_output_buffer)
 Request limit on max buffer size on all output ports. More...
 
void set_max_output_buffer (int port, long max_output_buffer)
 Request limit on max buffer size on output port port. More...
 
long min_output_buffer (size_t i)
 Returns min buffer size on output port i. More...
 
void set_min_output_buffer (long min_output_buffer)
 Request limit on the minimum buffer size on all output ports. More...
 
void set_min_output_buffer (int port, long min_output_buffer)
 Request limit on min buffer size on output port port. More...
 
void set_blkd_input_timer_value (unsigned int timer_value_ms)
 DEPRECATED Configure the timer set when input is blocked port. More...
 
unsigned int blkd_input_timer_value ()
 DEPRECATED Returns timer value set when input is blocked. More...
 
void allocate_detail (int ninputs, int noutputs, const std::vector< int > &downstream_max_nitems_vec, const std::vector< uint64_t > &downstream_lcm_nitems_vec, const std::vector< uint32_t > &downstream_max_out_mult_vec)
 Allocate the block_detail and necessary output buffers for this block. More...
 
buffer_sptr replace_buffer (size_t src_port, size_t dst_port, block_sptr block_owner)
 Replace the block's buffer with a new one owned by the block_owner parameter. More...
 
float pc_noutput_items ()
 Gets instantaneous noutput_items performance counter. More...
 
float pc_noutput_items_avg ()
 Gets average noutput_items performance counter. More...
 
float pc_noutput_items_var ()
 Gets variance of noutput_items performance counter. More...
 
float pc_nproduced ()
 Gets instantaneous num items produced performance counter. More...
 
float pc_nproduced_avg ()
 Gets average num items produced performance counter. More...
 
float pc_nproduced_var ()
 Gets variance of num items produced performance counter. More...
 
float pc_input_buffers_full (int which)
 Gets instantaneous fullness of which input buffer. More...
 
float pc_input_buffers_full_avg (int which)
 Gets average fullness of which input buffer. More...
 
float pc_input_buffers_full_var (int which)
 Gets variance of fullness of which input buffer. More...
 
std::vector< float > pc_input_buffers_full ()
 Gets instantaneous fullness of all input buffers. More...
 
std::vector< float > pc_input_buffers_full_avg ()
 Gets average fullness of all input buffers. More...
 
std::vector< float > pc_input_buffers_full_var ()
 Gets variance of fullness of all input buffers. More...
 
float pc_output_buffers_full (int which)
 Gets instantaneous fullness of which output buffer. More...
 
float pc_output_buffers_full_avg (int which)
 Gets average fullness of which output buffer. More...
 
float pc_output_buffers_full_var (int which)
 Gets variance of fullness of which output buffer. More...
 
std::vector< float > pc_output_buffers_full ()
 Gets instantaneous fullness of all output buffers. More...
 
std::vector< float > pc_output_buffers_full_avg ()
 Gets average fullness of all output buffers. More...
 
std::vector< float > pc_output_buffers_full_var ()
 Gets variance of fullness of all output buffers. More...
 
float pc_work_time ()
 Gets instantaneous clock cycles spent in work. More...
 
float pc_work_time_avg ()
 Gets average clock cycles spent in work. More...
 
float pc_work_time_var ()
 Gets average clock cycles spent in work. More...
 
float pc_work_time_total ()
 Gets total clock cycles spent in work. More...
 
float pc_throughput_avg ()
 Gets average throughput. More...
 
void reset_perf_counters ()
 Resets the performance counters. More...
 
void setup_pc_rpc ()
 Sets up export of perf. counters to ControlPort. Only called by the scheduler. More...
 
bool is_pc_rpc_set () const
 Checks if this block is already exporting perf. counters to ControlPort. More...
 
void no_pc_rpc ()
 If the block calls this in its constructor, it's perf. counters will not be exported. More...
 
void set_processor_affinity (const std::vector< int > &mask) override
 Set the thread's affinity to processor core n. More...
 
void unset_processor_affinity () override
 Remove processor affinity to a specific core. More...
 
std::vector< int > processor_affinity () override
 Get the current processor affinity. More...
 
int active_thread_priority ()
 Get the current thread priority in use. More...
 
int thread_priority ()
 Get the current thread priority stored. More...
 
int set_thread_priority (int priority)
 Set the current thread priority. More...
 
bool update_rate () const
 
void system_handler (pmt::pmt_t msg)
 the system message handler More...
 
void set_log_level (const std::string &level) override
 Set the logger's output level. More...
 
std::string log_level () override
 Get the logger's output level. More...
 
bool finished ()
 returns true when execution has completed due to a message connection More...
 
block_detail_sptr detail () const
 
void set_detail (block_detail_sptr detail)
 
void notify_msg_neighbors ()
 Tell msg neighbors we are finished. More...
 
void clear_finished ()
 Make sure we don't think we are finished. More...
 
std::string identifier () const
 
- Public Member Functions inherited from gr::basic_block
pmt::pmt_t message_subscribers (pmt::pmt_t port)
 
 ~basic_block () override
 
long unique_id () const
 
long symbolic_id () const
 
std::string name () const
 
std::string symbol_name () const
 
std::string identifier () const
 
gr::io_signature::sptr input_signature () const
 
gr::io_signature::sptr output_signature () const
 
basic_block_sptr to_basic_block ()
 
bool alias_set () const
 
std::string alias () const
 
pmt::pmt_t alias_pmt () const
 
void set_block_alias (std::string name)
 
void message_port_register_in (pmt::pmt_t port_id)
 
void message_port_register_out (pmt::pmt_t port_id)
 
void message_port_pub (pmt::pmt_t port_id, pmt::pmt_t msg)
 
void message_port_sub (pmt::pmt_t port_id, pmt::pmt_t target)
 
void message_port_unsub (pmt::pmt_t port_id, pmt::pmt_t target)
 
virtual bool message_port_is_hier (pmt::pmt_t port_id)
 
virtual bool message_port_is_hier_in (pmt::pmt_t port_id)
 
virtual bool message_port_is_hier_out (pmt::pmt_t port_id)
 
pmt::pmt_t message_ports_in ()
 Get input message port names. More...
 
pmt::pmt_t message_ports_out ()
 Get output message port names. More...
 
void _post (pmt::pmt_t which_port, pmt::pmt_t msg)
 
bool empty_p (pmt::pmt_t which_port)
 is the queue empty? More...
 
bool empty_p ()
 
bool empty_handled_p (pmt::pmt_t which_port)
 are all msg ports with handlers empty? More...
 
bool empty_handled_p ()
 
size_t nmsgs (pmt::pmt_t which_port)
 How many messages in the queue? More...
 
void insert_tail (pmt::pmt_t which_port, pmt::pmt_t msg)
 
pmt::pmt_t delete_head_nowait (pmt::pmt_t which_port)
 
msg_queue_t::iterator get_iterator (pmt::pmt_t which_port)
 
void erase_msg (pmt::pmt_t which_port, msg_queue_t::iterator it)
 
virtual bool has_msg_port (pmt::pmt_t which_port)
 
const msg_queue_map_t & get_msg_map (void) const
 
virtual void setup_rpc ()
 Set up the RPC registered variables. More...
 
bool is_rpc_set ()
 Ask if this block has been registered to the RPC. More...
 
void rpc_set ()
 When the block is registered with the RPC, set this. More...
 
virtual bool check_topology (int ninputs, int noutputs)
 Confirm that ninputs and noutputs is an acceptable combination. More...
 
template<typename T >
void set_msg_handler (pmt::pmt_t which_port, T msg_handler)
 Set the callback that is fired when messages are available. More...
 
- Public Member Functions inherited from gr::msg_accepter
 msg_accepter ()
 
 ~msg_accepter () override
 
void post (pmt::pmt_t which_port, pmt::pmt_t msg) override
 send msg to msg_accepter on port which_port More...
 
- Public Member Functions inherited from gr::messages::msg_accepter
 msg_accepter ()
 

Static Public Member Functions

static sptr make (const ::uhd::device_addr_t &device_addr, const ::uhd::stream_args_t &stream_args, const std::string &tsb_tag_name="")
 
static sptr make (const std::string &device_addr_str, const ::uhd::stream_args_t &stream_args, const std::string &tsb_tag_name="")
 

Additional Inherited Members

- Protected Types inherited from gr::basic_block
enum  vcolor { WHITE , GREY , BLACK }
 
- Protected Member Functions inherited from gr::uhd::usrp_block
 usrp_block ()
 
 usrp_block (const std::string &name, gr::io_signature::sptr input_signature, gr::io_signature::sptr output_signature)
 
- Protected Member Functions inherited from gr::sync_block
 sync_block (void)
 
 sync_block (const std::string &name, gr::io_signature::sptr input_signature, gr::io_signature::sptr output_signature)
 
- Protected Member Functions inherited from gr::block
 block (void)
 
 block (const std::string &name, gr::io_signature::sptr input_signature, gr::io_signature::sptr output_signature)
 
void set_fixed_rate (bool fixed_rate)
 
void add_item_tag (unsigned int which_output, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F)
 Adds a new tag onto the given output buffer. More...
 
void add_item_tag (unsigned int which_output, const tag_t &tag)
 Adds a new tag onto the given output buffer. More...
 
void remove_item_tag (unsigned int which_input, uint64_t abs_offset, const pmt::pmt_t &key, const pmt::pmt_t &value, const pmt::pmt_t &srcid=pmt::PMT_F)
 DEPRECATED. Will be removed in 3.8. More...
 
void remove_item_tag (unsigned int which_input, const tag_t &tag)
 DEPRECATED. Will be removed in 3.8. More...
 
void get_tags_in_range (std::vector< tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end)
 Given a [start,end), returns a vector of all tags in the range. More...
 
void get_tags_in_range (std::vector< tag_t > &v, unsigned int which_input, uint64_t abs_start, uint64_t abs_end, const pmt::pmt_t &key)
 Given a [start,end), returns a vector of all tags in the range with a given key. More...
 
void get_tags_in_window (std::vector< tag_t > &v, unsigned int which_input, uint64_t rel_start, uint64_t rel_end)
 Gets all tags within the relative window of the current call to work. More...
 
void get_tags_in_window (std::vector< tag_t > &v, unsigned int which_input, uint64_t rel_start, uint64_t rel_end, const pmt::pmt_t &key)
 Operates like gr::block::get_tags_in_window with the ability to only return tags with the specified key. More...
 
void enable_update_rate (bool en)
 
buffer_sptr allocate_buffer (size_t port, int downstream_max_nitems, uint64_t downstream_lcm_nitems, uint32_t downstream_max_out_mult)
 Allocate a buffer for the given output port of this block. Note that the downstream max number of items must be passed in to this function for consideration. More...
 
- Protected Member Functions inherited from gr::basic_block
 basic_block (void)
 
 basic_block (const std::string &name, gr::io_signature::sptr input_signature, gr::io_signature::sptr output_signature)
 Protected constructor prevents instantiation by non-derived classes. More...
 
void set_input_signature (gr::io_signature::sptr iosig)
 may only be called during constructor More...
 
void set_output_signature (gr::io_signature::sptr iosig)
 may only be called during constructor More...
 
void set_color (vcolor color)
 Allow the flowgraph to set for sorting and partitioning. More...
 
vcolor color () const
 
virtual bool has_msg_handler (pmt::pmt_t which_port)
 Tests if there is a handler attached to port which_port. More...
 
virtual void dispatch_msg (pmt::pmt_t which_port, pmt::pmt_t msg)
 
template<typename Derived >
std::shared_ptr< Derived > shared_from_base ()
 This is meant to be called by derived classes (e.g. block) to get a shared pointer internally. This is needed because std::enable_shared_from_this doesn't seem to work with derived classes in an inheritance hierarchy. More...
 
- Protected Attributes inherited from gr::block
std::vector< long > d_max_output_buffer
 
std::vector< long > d_min_output_buffer
 
unsigned int d_blkd_input_timer_value = 250
 
gr::thread::mutex d_setlock
 
const pmt::pmt_t d_pmt_done
 
const pmt::pmt_t d_system_port
 
- Protected Attributes inherited from gr::basic_block
std::string d_name
 
gr::io_signature::sptr d_input_signature
 
gr::io_signature::sptr d_output_signature
 
long d_unique_id
 
long d_symbolic_id
 
std::string d_symbol_name
 
std::string d_symbol_alias
 
vcolor d_color
 
bool d_rpc_set
 
gr::logger_ptr d_logger
 
gr::logger_ptr d_debug_logger
 Default logger. More...
 
msg_queue_map_t msg_queue
 Verbose logger. More...
 
std::vector< rpcbasic_sptr > d_rpc_vars
 
pmt::pmt_t d_message_subscribers
 

Detailed Description

USRP Sink – Radio Transmitter

The USRP sink block reads a stream and transmits the samples. The sink block also provides API calls for transmitter settings. See also gr::uhd::usrp_block for more public API calls.

TX Stream tagging

The following tag keys will be consumed by the work function:

Any other tag will be ignored.

Bursty Transmission

There are multiple ways to do bursty transmission without triggering underruns:

The sob and eob (start and end of burst) tag values are pmt booleans. When present, burst tags should be set to true (pmt::PMT_T).

If tsb_tag_name is not an empty string, all "tx_sob" and "tx_eob" tags will be ignored, and the input is assumed to a tagged stream.

If sob/eob tags or length tags are used, this block understands that the data is bursty, and will configure the USRP to make sure there's no underruns after transmitting the final sample of a burst.

Timestamps

The timestamp tag value is a PMT tuple of the following: (uint64 seconds, double fractional seconds).

The tx_freq tag has to be a double or a pair of form (channel, frequency), with frequency being a double and channel being an integer. This tag will trigger a tune command to the USRP to the given frequency, if possible. Note that oscillators need some time to stabilize after this! Don't expect clean data to be sent immediately after this command. If channel is omitted, and only a double is given, it will set this frequency to all channels.

The command tag can carry a PMT command. See the following section.

Command interface

There are two ways of passing commands to this block:

  1. tx_command tag. The command is attached to a sample, and will executed before the sample is transmitted, and after the previous sample.
  2. The 'command' message port. The command is executed asynchronously, as soon as possible.

In both cases, the payload of the command is a PMT command, as described in Section Command Syntax.

For a more general description of the gr-uhd components, see UHD Interface.

Member Typedef Documentation

◆ sptr

typedef std::shared_ptr<usrp_sink> gr::uhd::usrp_sink::sptr

Member Function Documentation

◆ get_lo_export_enabled()

virtual bool gr::uhd::usrp_sink::get_lo_export_enabled ( const std::string &  name,
size_t  chan = 0 
)
pure virtual

Returns true if the currently selected LO is being exported.

Parameters
namethe name of the LO stage to query
chanthe channel index 0 to N-1

◆ get_lo_freq()

virtual double gr::uhd::usrp_sink::get_lo_freq ( const std::string &  name,
size_t  chan = 0 
)
pure virtual

Get the current RX LO frequency (Advanced).

Parameters
namethe name of the LO stage to query
chanthe channel index 0 to N-1
Returns
the configured LO frequency

◆ get_lo_freq_range()

virtual ::uhd::freq_range_t gr::uhd::usrp_sink::get_lo_freq_range ( const std::string &  name,
size_t  chan = 0 
)
pure virtual

Get the LO frequency range of the RX LO.

Parameters
namethe name of the LO stage to query
chanthe channel index 0 to N-1
Returns
a frequency range object

◆ get_lo_names()

virtual std::vector<std::string> gr::uhd::usrp_sink::get_lo_names ( size_t  chan = 0)
pure virtual

Get a list of possible LO stage names

Parameters
chanthe channel index 0 to N-1
Returns
a vector of strings for possible LO names

◆ get_lo_source()

virtual const std::string gr::uhd::usrp_sink::get_lo_source ( const std::string &  name,
size_t  chan = 0 
)
pure virtual

Get the currently set LO source.

Parameters
namethe name of the LO stage to query
chanthe channel index 0 to N-1
Returns
the configured LO source

◆ get_lo_sources()

virtual std::vector<std::string> gr::uhd::usrp_sink::get_lo_sources ( const std::string &  name,
size_t  chan = 0 
)
pure virtual

Get a list of possible LO sources.

Parameters
namethe name of the LO stage to query
chanthe channel index 0 to N-1
Returns
a vector of strings for possible settings

◆ make() [1/2]

static sptr gr::uhd::usrp_sink::make ( const ::uhd::device_addr_t &  device_addr,
const ::uhd::stream_args_t stream_args,
const std::string &  tsb_tag_name = "" 
)
static
Parameters
device_addrthe address to identify the hardware
stream_argsthe IO format and channel specification
tsb_tag_namethe name of the tag identifying tagged stream length
Returns
a new USRP sink block object

◆ make() [2/2]

static sptr gr::uhd::usrp_sink::make ( const std::string &  device_addr_str,
const ::uhd::stream_args_t stream_args,
const std::string &  tsb_tag_name = "" 
)
inlinestatic

◆ set_dc_offset()

virtual void gr::uhd::usrp_sink::set_dc_offset ( const std::complex< double > &  offset,
size_t  chan = 0 
)
pure virtual

Set a constant DC offset value. The value is complex to control both I and Q.

Parameters
offsetthe dc offset (1.0 is full-scale)
chanthe channel index 0 to N-1

◆ set_iq_balance()

virtual void gr::uhd::usrp_sink::set_iq_balance ( const std::complex< double > &  correction,
size_t  chan = 0 
)
pure virtual

Set the RX frontend IQ imbalance correction. Use this to adjust the magnitude and phase of I and Q.

Parameters
correctionthe complex correction (1.0 is full-scale)
chanthe channel index 0 to N-1

◆ set_lo_export_enabled()

virtual void gr::uhd::usrp_sink::set_lo_export_enabled ( bool  enabled,
const std::string &  name,
size_t  chan = 0 
)
pure virtual

Set whether the LO used by the usrp device is exported For usrps that support exportable LOs, this function configures if the LO used by chan is exported or not.

Parameters
enabledif true then export the LO
namethe name of the LO stage to update
chanthe channel index 0 to N-1 for the source channel

◆ set_lo_freq()

virtual double gr::uhd::usrp_sink::set_lo_freq ( double  freq,
const std::string &  name,
size_t  chan = 0 
)
pure virtual

Set the RX LO frequency (Advanced).

Parameters
freqthe frequency to set the LO to
namethe name of the LO stage to update
chanthe channel index 0 to N-1
Returns
a coerced LO frequency

◆ set_lo_source()

virtual void gr::uhd::usrp_sink::set_lo_source ( const std::string &  src,
const std::string &  name,
size_t  chan = 0 
)
pure virtual

Set the LO source for the usrp device. For usrps that support selectable LOs, this function allows switching between them. Typical options for source: internal, external.

Parameters
srca string representing the LO source
namethe name of the LO stage to update
chanthe channel index 0 to N-1

◆ set_start_time()

virtual void gr::uhd::usrp_sink::set_start_time ( const ::uhd::time_spec_t &  time)
pure virtual

Set the start time for outgoing samples. To control when samples are transmitted, set this value before starting the flow graph. The value is cleared after each run. When not specified, the start time will be:

  • Immediately for the one channel case
  • in the near future for multi-channel
Parameters
timethe absolute time for transmission to begin

The documentation for this class was generated from the following file: