async.h File Reference

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Classes

struct  async_tx_state_t
struct  async_rx_state_t

Defines

#define _SPANDSP_ASYNC_H_
#define ASYNC_PARITY_NONE   0
#define ASYNC_PARITY_EVEN   1
#define ASYNC_PARITY_ODD   2

Typedefs

typedef void(*) put_msg_func_t (void *user_data, const uint8_t *msg, int len)
typedef int(*) get_msg_func_t (void *user_data, uint8_t *msg, int max_len)
typedef void(*) put_byte_func_t (void *user_data, int byte)
typedef int(*) get_byte_func_t (void *user_data)
typedef void(*) put_bit_func_t (void *user_data, int bit)
typedef int(*) get_bit_func_t (void *user_data)

Enumerations

enum  {
  PUTBIT_CARRIER_DOWN = -1, PUTBIT_CARRIER_UP = -2, PUTBIT_TRAINING_IN_PROGRESS = -3, PUTBIT_TRAINING_SUCCEEDED = -4,
  PUTBIT_TRAINING_FAILED = -5, PUTBIT_FRAMING_OK = -6, PUTBIT_END_OF_DATA = -7, PUTBIT_ABORT = -8,
  PUTBIT_BREAK = -9
}

Functions

void async_tx_init (async_tx_state_t *s, int data_bits, int parity_bits, int stop_bits, int use_v14, get_byte_func_t get_byte, void *user_data)
 Initialise an asynchronous data transmit context.
int async_tx_get_bit (void *user_data)
 Get the next bit of a transmitted serial bit stream.
void async_rx_init (async_rx_state_t *s, int data_bits, int parity_bits, int stop_bits, int use_v14, put_byte_func_t put_byte, void *user_data)
 Initialise an asynchronous data receiver context.
void async_rx_put_bit (void *user_data, int bit)
 Accept a bit from a received serial bit stream.


Detailed Description


Define Documentation

#define ASYNC_PARITY_EVEN   1

An even parity bit will exist, after the data bits

#define ASYNC_PARITY_NONE   0

No parity bit should be used

#define ASYNC_PARITY_ODD   2

An odd parity bit will exist, after the data bits


Typedef Documentation

typedef int(*) get_bit_func_t(void *user_data)

Bit get function for data pumps

typedef int(*) get_byte_func_t(void *user_data)

Byte get function for data pumps

typedef int(*) get_msg_func_t(void *user_data, uint8_t *msg, int max_len)

Message get function for data pumps

typedef void(*) put_bit_func_t(void *user_data, int bit)

Bit put function for data pumps

typedef void(*) put_byte_func_t(void *user_data, int byte)

Byte put function for data pumps

typedef void(*) put_msg_func_t(void *user_data, const uint8_t *msg, int len)

Message put function for data pumps


Enumeration Type Documentation

anonymous enum

Enumerator:
PUTBIT_CARRIER_DOWN  The carrier signal has dropped.
PUTBIT_CARRIER_UP  The carrier signal is up. This merely indicates that carrier energy has been seen. It is not an indication that the carrier is either valid, or of the expected type.
PUTBIT_TRAINING_IN_PROGRESS  The modem is training. This is an early indication that the signal seems to be of the right type. This may be needed in time critical applications, like T.38, to forward an early indication of what is happening on the wire.
PUTBIT_TRAINING_SUCCEEDED  The modem has trained, and is ready for data exchange.
PUTBIT_TRAINING_FAILED  The modem has failed to train.
PUTBIT_FRAMING_OK  Packet framing (e.g. HDLC framing) is OK.
PUTBIT_END_OF_DATA  The data stream has ended.
PUTBIT_ABORT  An abort signal (e.g. an HDLC abort) has been received.
PUTBIT_BREAK  A break signal (e.g. an async break) has been received.


Function Documentation

void async_rx_init ( async_rx_state_t s,
int  data_bits,
int  parity_bits,
int  stop_bits,
int  use_v14,
put_byte_func_t  put_byte,
void *  user_data 
)

Initialise an asynchronous data receiver context.

Initialise an asynchronous data receiver context.

Parameters:
s The receiver context.
data_bits The number of data bits.
parity_bits The type of parity.
stop_bits The number of stop bits.
use_v14 TRUE if V.14 rate adaption processing should be used.
put_byte The callback routine used to put the received data.
user_data An opaque pointer.

void async_rx_put_bit ( void *  user_data,
int  bit 
)

Accept a bit from a received serial bit stream.

Accept a bit from a received serial bit stream

Parameters:
user_data An opaque point which must point to a receiver context.
bit The new bit. Some special values are supported for this field.
  • PUTBIT_CARRIER_UP
  • PUTBIT_CARRIER_DOWN
  • PUTBIT_TRAINING_SUCCEEDED
  • PUTBIT_TRAINING_FAILED
  • PUTBIT_END_OF_DATA

int async_tx_get_bit ( void *  user_data  ) 

Get the next bit of a transmitted serial bit stream.

Get the next bit of a transmitted serial bit stream.

Parameters:
user_data An opaque point which must point to a transmitter context.
Returns:
the next bit, or PUTBIT_END_OF_DATA to indicate the data stream has ended.

void async_tx_init ( async_tx_state_t s,
int  data_bits,
int  parity_bits,
int  stop_bits,
int  use_v14,
get_byte_func_t  get_byte,
void *  user_data 
)

Initialise an asynchronous data transmit context.

Initialise an asynchronous data transmit context.

Parameters:
s The transmitter context.
data_bits The number of data bit.
parity_bits The type of parity.
stop_bits The number of stop bits.
use_v14 TRUE if V.14 rate adaption processing should be used.
get_byte The callback routine used to get the data to be transmitted.
user_data An opaque pointer.


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