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/**
* @file sclock.hpp
* @brief Manages sampling rate clock speeds.
*
* Copyright (C) 2023 Clyne Sullivan
*
* Distributed under the GNU GPL v3 or later. You should have received a copy of
* the GNU General Public License along with this program.
* If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef SCLOCK_HPP_
#define SCLOCK_HPP_
#include "hal.h"
#include <array>
class SClock
{
public:
// These are the supported sampling rates. GUI keeps its own enumeration.
enum class Rate : unsigned int {
R8K = 0,
R16K,
R20K,
R32K,
R48K,
R96K
};
/**
* Initializes the sample clock hardware.
*/
static void begin();
/**
* Starts the sample rate clock if it is not already running.
*/
static void start();
/**
* Indicate that the caller no longer needs the sample clock.
* This decrements an internal counter that is incremented by start()
* calls; if the counter reaches zero, the clock will actually stop.
*/
static void stop();
/**
* Sets the desired sampling rate, used for the next start() call.
*/
static void setRate(Rate rate);
/**
* Gets the desired sampling rate (SClock::Rate value) casted to an
* unsigned int.
*/
static unsigned int getRate();
private:
static GPTDriver *m_timer;
static unsigned int m_div;
static unsigned int m_runcount;
static const GPTConfig m_timer_config;
static const std::array<unsigned int, 6> m_rate_divs;
};
#endif // SCLOCK_HPP_
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