drivers/isdn/hardware/eicon/capidtmf.h

   1
   2 /*
   3  *
   4   Copyright (c) Eicon Networks, 2002.
   5  *
   6   This source file is supplied for the use with
   7   Eicon Networks range of DIVA Server Adapters.
   8  *
   9   Eicon File Revision :    2.1
  10  *
  11   This program is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU General Public License as published by
  13   the Free Software Foundation; either version 2, or (at your option)
  14   any later version.
  15  *
  16   This program is distributed in the hope that it will be useful,
  17   but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY
  18   implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  19   See the GNU General Public License for more details.
  20  *
  21   You should have received a copy of the GNU General Public License
  22   along with this program; if not, write to the Free Software
  23   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  */
  26 #ifndef CAPIDTMF_H_
  27 #define CAPIDTMF_H_
  28 /*---------------------------------------------------------------------------*/
  29 /*---------------------------------------------------------------------------*/
  30 #define CAPIDTMF_TONE_GROUP_COUNT            2
  31 #define CAPIDTMF_LOW_GROUP_FREQUENCIES       4
  32 #define CAPIDTMF_HIGH_GROUP_FREQUENCIES      4
  33 #define DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT      50      /* -52 dBm */
  34 #define DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT     50      /* -52 dBm */
  35 #define DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT   10      /* dB */
  36 #define DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT   10      /* dB */
  37 #define DSPDTMF_RX_HARMONICS_SEL_DEFAULT        12      /* dB */
  38 #define CAPIDTMF_RECV_BASE_FREQUENCY_COUNT   (CAPIDTMF_LOW_GROUP_FREQUENCIES + CAPIDTMF_HIGH_GROUP_FREQUENCIES)
  39 #define CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT  8
  40 #define CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT  (CAPIDTMF_RECV_BASE_FREQUENCY_COUNT + CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT)
  41 #define CAPIDTMF_RECV_POSITIVE_COEFF_COUNT   16
  42 #define CAPIDTMF_RECV_NEGATIVE_COEFF_COUNT   (CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - CAPIDTMF_RECV_POSITIVE_COEFF_COUNT)
  43 #define CAPIDTMF_RECV_ACCUMULATE_CYCLES      205
  44 #define CAPIDTMF_RECV_FUNDAMENTAL_OFFSET     (0xff35L * 2)
  45 #define CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT  (0x0028L * 2)
  46 #define CAPIDTMF_RECV_DIGIT_BUFFER_SIZE      32
  47 #define CAPIDTMF_RECV_STATE_IDLE             0x00
  48 #define CAPIDTMF_RECV_STATE_DTMF_ACTIVE      0x01
  49 typedef struct tag_capidtmf_recv_state
  50 {
  51   byte digit_buffer[CAPIDTMF_RECV_DIGIT_BUFFER_SIZE];
  52   word digit_write_pos;
  53   word digit_read_pos;
  54   word indication_state;
  55   word indication_state_ack;
  56   long goertzel_buffer[2][CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
  57   word min_gap_duration;
  58   word min_digit_duration;
  59   word cycle_counter;
  60   word current_digit_on_time;
  61   word current_digit_off_time;
  62   byte current_digit_value;
  63   byte state;
  64 } t_capidtmf_recv_state;
  65 typedef struct tag_capidtmf_state
  66 {
  67   byte ulaw;
  68   t_capidtmf_recv_state recv;
  69 } t_capidtmf_state;
  70 word capidtmf_recv_indication (t_capidtmf_state   *p_state, byte *buffer);
  71 void capidtmf_recv_block (t_capidtmf_state   *p_state, byte   *buffer, word length);
  72 void capidtmf_init (t_capidtmf_state   *p_state, byte ulaw);
  73 void capidtmf_recv_enable (t_capidtmf_state   *p_state, word min_digit_duration, word min_gap_duration);
  74 void capidtmf_recv_disable (t_capidtmf_state   *p_state);
  75 #define capidtmf_indication(p_state,buffer)  (((p_state)->recv.indication_state != (p_state)->recv.indication_state_ack) ?    capidtmf_recv_indication (p_state, buffer) : 0)
  76 #define capidtmf_recv_process_block(p_state,buffer,length)  { if ((p_state)->recv.state != CAPIDTMF_RECV_STATE_IDLE) capidtmf_recv_block (p_state, buffer, length); }
  77 /*---------------------------------------------------------------------------*/
  78 /*---------------------------------------------------------------------------*/
  79 #endif