tempo_tapper.h

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/*
 * Copyright (C) 2021  Patrick Pedersen
 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 * 
 */
 
#pragma once
 
#include <stdint.h>
 
#define S_TO_US 1000000
 
#if defined(TT_TARGET_PLATFORM_POSIX)
 
#include <sys/time.h>
typedef struct timeval tt_time_t;
 
#elif defined(TT_TARGET_PLATFORM_ARDUINO)
 
#include <Arduino.h>
typedef unsigned long tt_time_t;
 
#else
 
#error No target platform specified!
 
#endif
 
typedef float BPM_t; // Data type to store BPM values
 
typedef struct tempo_tapper
{
        tt_time_t prd_sum;      
        tt_time_t lst_t;        
        int taps;               
} tempo_tapper;
 
// Platform Specific
 
void current_time(tt_time_t *time);
 
void add_time(tt_time_t *a, tt_time_t *b, tt_time_t *res);
 
void sub_time(tt_time_t *a, tt_time_t *b, tt_time_t *res);
 
void reset_time(tt_time_t *time);
 
unsigned long time_to_us(tt_time_t *time);
 
// Common
 
tempo_tapper* tt_new();
 
unsigned long tt_period_us(tempo_tapper *tapper);
 
void tt_tap(tempo_tapper *tapper);
 
void tt_reset(tempo_tapper *tapper);
 
BPM_t tt_bpm(tempo_tapper *tapper);