File HardwareI2C.h

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/* Copyright (c) Kuba Szczodrzyński 2022-05-09. */

#include <api/Stream.h>

class HardwareI2C : public Stream {
  protected:
    int8_t _sda    = -1;
    int8_t _scl    = -1;
    uint32_t _freq = 0;

    void (*onRequestCallback)(void);
    void (*onReceiveCallback)(int);

  public:
    bool begin() {
        return begin(_sda, _scl, _freq);
    }

    bool begin(uint8_t address) {
        return begin(address, _sda, _scl, _freq);
    }

    virtual bool setPins(int8_t sda, int8_t scl) = 0;

    virtual bool begin(int8_t sda, int8_t scl, uint32_t frequency = 0)                  = 0;
    virtual bool begin(uint8_t address, int8_t sda, int8_t scl, uint32_t frequency = 0) = 0;
    virtual bool end()                                                                  = 0;

    virtual bool setClock(uint32_t freq) = 0;

    virtual void beginTransmission(uint8_t address) = 0;
    virtual uint8_t endTransmission(bool stopBit)   = 0;

    virtual size_t requestFrom(uint8_t address, size_t len, bool stopBit) = 0;

    virtual size_t write(const uint8_t *data, size_t len) = 0;

    virtual int available() = 0;
    virtual int read()      = 0;
    virtual int peek()      = 0;
    virtual void flush()    = 0;

    uint32_t getClock() {
        return _freq;
    }

    uint8_t endTransmission() {
        return endTransmission(true);
    }

    size_t requestFrom(uint8_t address, size_t len) {
        return requestFrom(address, len, true);
    }

    virtual size_t write(uint8_t data) {
        return write(&data, 1);
    }

    void onReceive(void (*cb)(int)) {
        onReceiveCallback = cb;
    }

    void onRequest(void (*cb)(void)) {
        onRequestCallback = cb;
    }
};