#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include "spandsp/telephony.h"
#include "spandsp/power_meter.h"
#include "spandsp/async.h"
#include "spandsp/hdlc.h"
#include "spandsp/fsk.h"
#include "spandsp/bit_operations.h"
#include "spandsp/timing.h"
Functions | |
uint32_t | crc_itu32_calc (const uint8_t *buf, int len, uint32_t crc) |
Calculate the ITU/CCITT CRC-32 value in buffer. | |
int | crc_itu32_append (uint8_t *buf, int len) |
Append an ITU/CCITT CRC-32 value to a frame. | |
int | crc_itu32_check (const uint8_t *buf, int len) |
Check the ITU/CCITT CRC-32 value in a frame. | |
uint16_t | crc_itu16_calc (const uint8_t *buf, int len, uint16_t crc) |
Calculate the ITU/CCITT CRC-16 value in buffer. | |
int | crc_itu16_append (uint8_t *buf, int len) |
Append an ITU/CCITT CRC-16 value to a frame. | |
int | crc_itu16_check (const uint8_t *buf, int len) |
Check the ITU/CCITT CRC-16 value in a frame. | |
void | hdlc_rx_put_bit (hdlc_rx_state_t *s, int new_bit) |
void | hdlc_rx_put_byte (hdlc_rx_state_t *s, int new_byte) |
int | hdlc_tx_frame (hdlc_tx_state_t *s, const uint8_t *frame, int len) |
Transmit a frame. | |
int | hdlc_tx_preamble (hdlc_tx_state_t *s, int len) |
Transmit a specified quantity of flag octets as a preamble. | |
int | hdlc_tx_corrupt_frame (hdlc_tx_state_t *s) |
Corrupt the frame currently being transmitted, by giving it the wrong CRC. | |
int | hdlc_tx_get_byte (hdlc_tx_state_t *s) |
Get the next byte for transmission. | |
int | hdlc_tx_get_bit (hdlc_tx_state_t *s) |
Get the next bit for transmission. | |
hdlc_rx_state_t * | hdlc_rx_init (hdlc_rx_state_t *s, int crc32, int report_bad_frames, int framing_ok_threshold, hdlc_frame_handler_t handler, void *user_data) |
Initialise an HDLC receiver context. | |
int | hdlc_rx_get_stats (hdlc_rx_state_t *s, hdlc_rx_stats_t *t) |
Get the current receive statistics. | |
void | hdlc_tx_set_max_frame_len (hdlc_tx_state_t *s, int max_len) |
Set the maximum frame length for an HDLC transmitter context. | |
hdlc_tx_state_t * | hdlc_tx_init (hdlc_tx_state_t *s, int crc32, int inter_frame_flags, int progressive, hdlc_underflow_handler_t handler, void *user_data) |
Initialise an HDLC transmitter context. |
int crc_itu16_append | ( | uint8_t * | buf, | |
int | len | |||
) |
Append an ITU/CCITT CRC-16 value to a frame.
buf | The buffer containing the frame. This must be at least 2 bytes longer than the frame it contains, to allow room for the CRC value. | |
len | The length of the frame. |
uint16_t crc_itu16_calc | ( | const uint8_t * | buf, | |
int | len, | |||
uint16_t | crc | |||
) |
Calculate the ITU/CCITT CRC-16 value in buffer.
buf | The buffer containing the data. | |
len | The length of the frame. | |
crc | The initial CRC value. This is usually 0xFFFF, or 0 for a new block (it depends on the application). It is previous returned CRC value for the continuation of a block. |
int crc_itu16_check | ( | const uint8_t * | buf, | |
int | len | |||
) |
Check the ITU/CCITT CRC-16 value in a frame.
buf | The buffer containing the frame. | |
len | The length of the frame. |
int crc_itu32_append | ( | uint8_t * | buf, | |
int | len | |||
) |
Append an ITU/CCITT CRC-32 value to a frame.
buf | The buffer containing the frame. This must be at least 2 bytes longer than the frame it contains, to allow room for the CRC value. | |
len | The length of the frame. |
uint32_t crc_itu32_calc | ( | const uint8_t * | buf, | |
int | len, | |||
uint32_t | crc | |||
) |
Calculate the ITU/CCITT CRC-32 value in buffer.
buf | The buffer containing the data. | |
len | The length of the frame. | |
crc | The initial CRC value. This is usually 0xFFFFFFFF, or 0 for a new block (it depends on the application). It is previous returned CRC value for the continuation of a block. |
int crc_itu32_check | ( | const uint8_t * | buf, | |
int | len | |||
) |
Check the ITU/CCITT CRC-32 value in a frame.
buf | The buffer containing the frame. | |
len | The length of the frame. |
int hdlc_rx_get_stats | ( | hdlc_rx_state_t * | s, | |
hdlc_rx_stats_t * | t | |||
) |
Get the current receive statistics.
s | A pointer to an HDLC receiver context. | |
t | A pointer to the buffer for the statistics. |
hdlc_rx_state_t* hdlc_rx_init | ( | hdlc_rx_state_t * | s, | |
int | crc32, | |||
int | report_bad_frames, | |||
int | framing_ok_threshold, | |||
hdlc_frame_handler_t | handler, | |||
void * | user_data | |||
) |
Initialise an HDLC receiver context.
s | A pointer to an HDLC receiver context. | |
crc32 | TRUE to use ITU CRC32. FALSE to use ITU CRC16. | |
report_bad_frames | TRUE to request the reporting of bad frames. | |
framing_ok_threshold | The number of back-to-back flags needed to start the framing OK condition. This may be used where a series of flag octets is used as a preamble, such as in the T.30 protocol. | |
handler | The function to be called when a good HDLC frame is received. | |
user_data | An opaque parameter for the callback routine. |
int hdlc_tx_corrupt_frame | ( | hdlc_tx_state_t * | s | ) |
Corrupt the frame currently being transmitted, by giving it the wrong CRC.
s | A pointer to an HDLC transmitter context. |
int hdlc_tx_frame | ( | hdlc_tx_state_t * | s, | |
const uint8_t * | frame, | |||
int | len | |||
) |
Transmit a frame.
s | A pointer to an HDLC transmitter context. | |
frame | A pointer to the frame to be transmitted. | |
len | The length of the frame to be transmitted. |
int hdlc_tx_get_bit | ( | hdlc_tx_state_t * | s | ) |
Get the next bit for transmission.
s | A pointer to an HDLC transmitter context. |
int hdlc_tx_get_byte | ( | hdlc_tx_state_t * | s | ) |
Get the next byte for transmission.
s | A pointer to an HDLC transmitter context. |
hdlc_tx_state_t* hdlc_tx_init | ( | hdlc_tx_state_t * | s, | |
int | crc32, | |||
int | inter_frame_flags, | |||
int | progressive, | |||
hdlc_underflow_handler_t | handler, | |||
void * | user_data | |||
) |
Initialise an HDLC transmitter context.
s | A pointer to an HDLC transmitter context. | |
crc32 | TRUE to use ITU CRC32. FALSE to use ITU CRC16. | |
inter_frame_flags | The minimum flag octets to insert between frames (usually one). | |
progressive | TRUE if frame creation works in progressive mode. | |
handler | The callback function called when the HDLC transmitter underflows. | |
user_data | An opaque parameter for the callback routine. |
int hdlc_tx_preamble | ( | hdlc_tx_state_t * | s, | |
int | len | |||
) |
Transmit a specified quantity of flag octets as a preamble.
s | A pointer to an HDLC transmitter context. | |
len | The length of the required preamble, in flag octets. If len is zero this requests that HDLC transmission be terminated when the buffers have fully drained. |
void hdlc_tx_set_max_frame_len | ( | hdlc_tx_state_t * | s, | |
int | max_len | |||
) |
Set the maximum frame length for an HDLC transmitter context.
s | A pointer to an HDLC transmitter context. | |
max_len | The maximum length. |