v27ter_tx.h File Reference

Go to the source code of this file.

Defines
#define	_SPANDSP_V27TER_TX_H_
#define	V27TER_TX_FILTER_STEPS   9
Typedefs
typedef struct v27ter_tx_state_s	v27ter_tx_state_t
Functions
void	v27ter_tx_power (v27ter_tx_state_t *s, float power)
	Adjust a V.27ter modem transmit context's output power.
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_restart (v27ter_tx_state_t *s, int bit_rate, int tep)
	Reinitialise an existing V.27ter modem transmit context.
int	v27ter_tx_release (v27ter_tx_state_t *s)
	Release a V.27ter modem transmit context.
int	v27ter_tx_free (v27ter_tx_state_t *s)
	Free a V.27ter modem transmit context.
logging_state_t *	v27ter_tx_get_logging_state (v27ter_tx_state_t *s)
	Get the logging context associated with a V.27ter modem transmit context.
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 (v27ter_tx_state_t *s, int16_t amp[], int len)
	Generate a block of V.27ter modem audio samples.

---

Detailed Description

---

Define Documentation

#define V27TER_TX_FILTER_STEPS   9

The number of taps in the pulse shaping/bandpass filter

Referenced by v27ter_tx().

---

Typedef Documentation

typedef struct v27ter_tx_state_s v27ter_tx_state_t

V.27ter modem transmit side descriptor. This defines the working state for a single instance of a V.27ter modem transmitter.

---

Function Documentation

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

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

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 dds_complexf(), dds_complexi(), complexf_t::im, complexf_t::re, V27TER_TRAINING_SHUTDOWN_END, and V27TER_TX_FILTER_STEPS.

int v27ter_tx_free

(

v27ter_tx_state_t *

s

)

Free a V.27ter modem transmit context.

Free a V.27ter modem transmit context.

Parameters:

s

The modem context.

Returns:

0 for OK

logging_state_t* v27ter_tx_get_logging_state

(

v27ter_tx_state_t *

s

)

Get the logging context associated with a V.27ter modem transmit context.

Get the logging context associated with a V.27ter modem transmit context.

Parameters:

s

The modem context.

Returns:

A pointer to the logging 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.

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 CARRIER_NOMINAL_FREQ, dds_phase_ratef(), 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

Referenced by v27ter_tx_init().

int v27ter_tx_release

(

v27ter_tx_state_t *

s

)

Release a V.27ter modem transmit context.

Release a V.27ter modem transmit context.

Parameters:

s

The modem context.

Returns:

0 for OK

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_TRAINING_SEG_1, and V27TER_TRAINING_SEG_2.

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.

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.

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.

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.