core_intervaltimer_samd21.h

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/*
    This file is part of the Firmware project to interface with small Async or Neuromorphic chips
    Copyright (C) 2023 Ole Richter - University of Groningen
 
    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/>.
*/
 
#if defined(ARDUINO_ARCH_SAMD)
// hardcoded to 48MHz should check via F_CPU flag
#ifndef INTERVALTIMER_H
#define INTERVALTIMER_H
#define INTERVALTIMER_MAX_TIMERS 2
#include <Arduino.h>
 
typedef void (*callfunction_t) ();
 
class IntervalTimer {
    public:
        IntervalTimer() {
            counter_id = INTERVALTIMER_MAX_TIMERS;
            last_period = 100U;
            last_priority = 3U;
        }
        ~IntervalTimer() {end();}
        
        bool begin(callfunction_t callback, uint32_t usec) volatile;
        void update(uint32_t usec) volatile;
        void end() volatile;
        void priority(uint8_t priority) volatile;
 
        static callfunction_t _TC5_callfunc;
 
        static callfunction_t _TC4_callfunc;
 
    private:
        //static TcCount16* TC[INTERVALTIMER_MAX_TIMERS];
        static bool counter_active[INTERVALTIMER_MAX_TIMERS];
 
        uint8_t counter_id;
 
        uint32_t last_period;
 
        uint8_t last_priority;
 
        bool init_ran;
 
};
/* 
Interrupt Service Routine for TC4
for use by class
*/
extern void TC4_Handler();
/* 
Interrupt Service Routine for TC5
for use by class
*/
extern void TC5_Handler();
 
#endif
#endif