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libmorse.h
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/*
* Copyright (c) 2020-21, Kalopa Robotics Limited. All rights
* reserved. Written by Dermot Tynan, EI4HRB <[email protected]>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ABSTRACT
* The morse library (libmorse) provides a simple interface for creating
* an audio stream of morse code based on a given character string. It
* can be used to build code testers or just simple Morse Code tools. Have
* fun!
*/
#define AUDIO_BUFFER_SIZE 16*1024
struct morse {
/*
* The following parameters can be modified/examined. If you
* change any of these, make sure to call morse_calc_params()
* to make the appropriate adjustments.
* wpm: Words per minute (5->60)
* farnsworth: Set to non-zero for farnsworth speeds
* amplitude: Signal amplitude (0->100.0)
* sample_rate: Audio sample rate (usually 44.1kHz)
* tone_frequency: Audio tone - 800Hz is a good value
*/
int wpm;
int farnsworth;
int amplitude;
int sample_rate;
double tone_frequency;
/*
* Do not modify any of the following parameters.
*/
int setup_done;
unsigned int time_stamp;
unsigned int bit_time;
unsigned int char_delay;
unsigned int word_delay;
unsigned int sym_delay;
int prosign;
unsigned short word;
int offset;
void *audio;
unsigned short *buffer;
};
/*
* Prototypes...
*/
struct morse *morse_init(int);
void morse_send_char(struct morse *, int);
void morse_send_word(struct morse *, char *);
void morse_send_string(struct morse *, char *);
double morse_timestamp(struct morse *);
void morse_calc_params(struct morse *);
void morse_audio_tone(struct morse *, int);
void morse_audio_silence(struct morse *);
/*
* Platform-specific soundcard functions.
*/
void sound_open(struct morse *);
void sound_commence(struct morse *);
void sound_out(struct morse *, int);
void sound_drain(struct morse *);
void sound_close(struct morse *);