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#ifndef EXTRA_ONE_WIRE_H_
#define EXTRA_ONE_WIRE_H_
#include "../gpio.hpp"
#include "../timer.hpp"
#include <string.h>
namespace cm3cpp {
namespace extra {
namespace timer = cm3cpp::tim;
class OneWire
{
public:
using Timer = cm3cpp::tim::Timer;
using Gpio = cm3cpp::gpio::Gpio;
OneWire(Gpio::Pinout p, uint8_t tim_number, uint32_t tim_presc);
~OneWire() = default;
uint8_t read_byte(void);
void write_byte(uint8_t data);
bool read_bit(void);
void write_bit(bool bit);
bool touch_reset(void);
bool search_first(bool do_reset, bool alarm_only);
bool search_next(bool do_reset, bool alarm_only);
void get_serial_number(uint8_t* sn_buffer, bool do_read);
private:
static constexpr uint16_t _SLOT_LENGTH = 78;
static constexpr uint16_t _RESET_PULSE_TIME_US = 520;
static constexpr uint16_t _LOW_PULSE_TIME_US = 3;
static constexpr uint16_t _READ_SAMPLE_TIME_US = 12;
static constexpr uint16_t _READ_SAMPLE_WAIT_US =
(_READ_SAMPLE_TIME_US - _LOW_PULSE_TIME_US);
static constexpr uint16_t _END_READ_SLOT_WAIT_US =
(_SLOT_LENGTH - _READ_SAMPLE_TIME_US);
static constexpr uint16_t _RECOVERY_TIME_US = 6;
static constexpr uint16_t _WRITE_SLOT_WAIT_US =
(_SLOT_LENGTH - _LOW_PULSE_TIME_US);
static constexpr uint8_t _SERIAL_LENGTH = 8;
static constexpr uint8_t _SEARCH = 0xF0;
static constexpr uint8_t _SEARCH_ALARM = 0xEC;
Gpio _pinout;
Timer _timer;
uint8_t _serial[_SERIAL_LENGTH];
uint8_t _last_discrepancy;
uint8_t _last_family_discrepancy;
bool _last_device;
void _wait(uint16_t time);
void _crc_check(uint8_t data, uint8_t* crc_byte);
};
} /* namespace extra */
} /* namespace cm3cpp */
#endif /* EXTRA_ONE_WIRE_H_ */
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