tone-generator/scheduler.cpp

#include <Arduino.h>
#include "timing.hpp"
#include "scheduler.hpp"
#include "data.hpp"
#include "entry.hpp"
#include "tones.hpp"
#include "util.hpp"
#include "buttons.hpp"

using namespace scheduler;

static uint32_t ts_init = 0;
static uint32_t ts_last = 0;
struct {
	uint8_t amplitude = 1;
	uint32_t us_per_tick = 1;
} config;
struct {
	uint8_t index;
	uint8_t amplitude;
	uint16_t frequency;
	bool active = false;
} next;

void scheduler::reset() {
	tones::clear_all();
	ts_init = timestamp = micros();
}

static void do_next() {
	
	int i = 1;

	if(next.active) {
		if(state == State::play) {
			tones::set(next.index, next.frequency, next.amplitude);
		}
		next.active = false;
	}

	uint64_t v = 0;
	uint8_t buff[8];
	data::read(buff, 1);
	
	entry::Type type = buff[0] >> 5;
	int entry_size = entry::get_size(type);
	data::read(buff + 1, entry_size - 1);

	for(int i = 0; i < entry_size; i++) {
		v = (v << 8) | buff[i];
	}

	switch(type) {
		case entry::Type::config: {
			buttons::set_addr_next((v & bm(24)) + data::get_addr());
			v >>= 24;
			config.amplitude = v & bm(8);
			v >>= 8;
			config.us_per_tick = v & bm(29);
			state = State::play;
			scheduler::reset();
			break;
		}
		case entry::Type::set: {
			v >>= 4;
			next.frequency = v & bm(12);
			v >>= 12;
			next.index = v & bm(5);
			next.amplitude = config.amplitude;
			next.active = true;
			break;
		}
		case entry::Type::set_ts: {
			next.frequency = v & bm(12);
			v >>= 12;
			uint32_t ticks = v & bm(20);
			v >>= 20;
			next.index = v & bm(5);
			next.amplitude = config.amplitude;
			next.active = true;
			timestamp = ticks * config.us_per_tick + ts_init;
			break;
		}
		case entry::Type::clear: {
			next.index = v & bm(5);
			next.frequency = 0;
			next.amplitude = 0;
			next.active = true;
			break;
		}
		case entry::Type::clear_ts: {
			v >>= 4;
			uint32_t ticks = v & bm(20);
			v >>= 20;
			next.index = v & bm(5);
			next.frequency = 0;
			next.amplitude = 0;
			next.active = true;
			timestamp = ticks * config.us_per_tick + ts_init;
			break;
		}
		default: {
			state = State::end;
			tones::clear_all();
			break;
		}
	}
}

void scheduler::do_all() {
	do {
		do_next();
	} while(should_update());
	tones::recalc();
}