v27ter_tx.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include "floating_fudge.h"
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/complex.h"
#include "spandsp/vector_float.h"
#include "spandsp/complex_vector_float.h"
#include "spandsp/async.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v27ter_tx.h"
#include "v27ter_tx_4800_floating_rrc.h"
#include "v27ter_tx_2400_floating_rrc.h"


Defines
#define	CARRIER_NOMINAL_FREQ 1800.0f
#define	V27TER_TRAINING_SEG_1 0
#define	V27TER_TRAINING_SEG_2 (V27TER_TRAINING_SEG_1 + 320)
#define	V27TER_TRAINING_SEG_3 (V27TER_TRAINING_SEG_2 + 32)
#define	V27TER_TRAINING_SEG_4 (V27TER_TRAINING_SEG_3 + 50)
#define	V27TER_TRAINING_SEG_5 (V27TER_TRAINING_SEG_4 + 1074)
#define	V27TER_TRAINING_END (V27TER_TRAINING_SEG_5 + 8)
#define	V27TER_TRAINING_SHUTDOWN_END (V27TER_TRAINING_END + 32)
Functions
int	v27ter_tx (v27ter_tx_state_t *s, int16_t amp[], int len)
	Generate a block of V.27ter modem audio samples.
void	v27ter_tx_power (v27ter_tx_state_t *s, float power)
	Adjust a V.27ter modem transmit context's output power.
void	v27ter_tx_set_get_bit (v27ter_tx_state_t s, get_bit_func_t get_bit, void user_data)
	Change the get_bit function associated with a V.27ter modem transmit context.
void	v27ter_tx_set_modem_status_handler (v27ter_tx_state_t s, modem_tx_status_func_t handler, void user_data)
	Change the modem status report function associated with a V.27ter modem transmit context.
int	v27ter_tx_restart (v27ter_tx_state_t *s, int bit_rate, int tep)
	Reinitialise an existing V.27ter modem transmit context.
v27ter_tx_state_t *	v27ter_tx_init (v27ter_tx_state_t s, int bit_rate, int tep, get_bit_func_t get_bit, void user_data)
	Initialise a V.27ter modem transmit context.
int	v27ter_tx_free (v27ter_tx_state_t *s)
	Free a V.27ter modem transmit context.

Detailed Description

Function Documentation

int v27ter_tx	(	v27ter_tx_state_t *	s,
		int16_t	amp[],
		int	len
	)

Generate a block of V.27ter modem audio samples.

Parameters:

	s	The modem context.
	amp	The audio sample buffer.
	len	The number of samples to be generated.

Returns:: The number of samples actually generated.

References v27ter_tx_state_t::baud_phase, v27ter_tx_state_t::bit_rate, v27ter_tx_state_t::carrier_phase, v27ter_tx_state_t::carrier_phase_rate, dds_complexf(), dds_complexi(), v27ter_tx_state_t::gain_2400, v27ter_tx_state_t::gain_4800, complexf_t::im, complexf_t::re, v27ter_tx_state_t::rrc_filter, v27ter_tx_state_t::rrc_filter_step, and v27ter_tx_state_t::training_step.

int v27ter_tx_free ( v27ter_tx_state_t * s )

Free a V.27ter modem transmit context.

Parameters:

s

The modem context.

Returns:: 0 for OK

v27ter_tx_state_t* v27ter_tx_init	(	v27ter_tx_state_t *	s,
		int	bit_rate,
		int	tep,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Initialise a V.27ter modem transmit context.

Parameters:

	s	The modem context.
	bit_rate	The bit rate of the modem. Valid values are 2400 and 4800.
	tep	TRUE is the optional TEP tone is to be transmitted.
	get_bit	The callback routine used to get the data to be transmitted.
	user_data	An opaque pointer.

Returns:: A pointer to the modem context, or NULL if there was a problem.

References v27ter_tx_state_t::carrier_phase_rate, dds_phase_ratef(), v27ter_tx_state_t::get_bit, v27ter_tx_state_t::get_bit_user_data, v27ter_tx_state_t::logging, v27ter_tx_power(), and v27ter_tx_restart().

void v27ter_tx_power	(	v27ter_tx_state_t *	s,
		float	power
	)

Adjust a V.27ter modem transmit context's output power.

Adjust a V.27ter modem transmit context's power output.

Parameters:

	s	The modem context.
	power	The power level, in dBm0

References v27ter_tx_state_t::gain_2400, and v27ter_tx_state_t::gain_4800.

Referenced by v27ter_tx_init().

int v27ter_tx_restart	(	v27ter_tx_state_t *	s,
		int	bit_rate,
		int	tep
	)

Reinitialise an existing V.27ter modem transmit context.

Reinitialise an existing V.27ter modem transmit context, so it may be reused.

Parameters:

	s	The modem context.
	bit_rate	The bit rate of the modem. Valid values are 2400 and 4800.
	tep	TRUE is the optional TEP tone is to be transmitted.

Returns:: 0 for OK, -1 for bad parameter

References v27ter_tx_state_t::baud_phase, v27ter_tx_state_t::bit_rate, v27ter_tx_state_t::carrier_phase, v27ter_tx_state_t::constellation_state, v27ter_tx_state_t::current_get_bit, v27ter_tx_state_t::in_training, v27ter_tx_state_t::rrc_filter, v27ter_tx_state_t::rrc_filter_step, v27ter_tx_state_t::scramble_reg, v27ter_tx_state_t::scrambler_pattern_count, and v27ter_tx_state_t::training_step.

Referenced by v27ter_tx_init().

void v27ter_tx_set_get_bit	(	v27ter_tx_state_t *	s,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Change the get_bit function associated with a V.27ter modem transmit context.

Parameters:

	s	The modem context.
	get_bit	The callback routine used to get the data to be transmitted.
	user_data	An opaque pointer.

References v27ter_tx_state_t::current_get_bit, v27ter_tx_state_t::get_bit, and v27ter_tx_state_t::get_bit_user_data.

void v27ter_tx_set_modem_status_handler	(	v27ter_tx_state_t *	s,
		modem_tx_status_func_t	handler,
		void *	user_data
	)

Change the modem status report function associated with a V.27ter modem transmit context.

Parameters:

	s	The modem context.
	handler	The callback routine used to report modem status changes.
	user_data	An opaque pointer.

References v27ter_tx_state_t::status_handler, and v27ter_tx_state_t::status_user_data.

v27ter_tx.c File Reference

Defines

Functions

Detailed Description

Function Documentation