softi2cmaster.h

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#ifndef SEMF_COMMUNICATION_SOFTI2CMASTER_H_
#define SEMF_COMMUNICATION_SOFTI2CMASTER_H_
 
#include <semf/app/system/timer.h>
#include <semf/communication/i2cmasterhardware.h>
#include <semf/system/gpio.h>
#include <semf/utils/core/signals/slot.h>
 
namespace semf
{
class SoftI2cMaster : public I2cMasterHardware
{
public:
    enum class ErrorCode : uint8_t
    {
        StopConditionSetSda_NackError = 0
    };
    SoftI2cMaster(Gpio& scl, Gpio& sda, app::Timer& timer);
    explicit SoftI2cMaster(const SoftI2cMaster& other) = delete;
    virtual ~SoftI2cMaster() = default;
 
    void init() override;
    void deinit() override;
    void stopWrite() override;
    void stopRead() override;
 
protected:
    void writeHardware(const uint8_t data[], size_t size) override;
    void readHardware(uint8_t buffer[], size_t bufferSize) override;
 
private:
    // RESTART CONDITION
    void resartConditionSetSdaResetScl();
    void resartConditionSetScl();
 
    // START CONDITION
    void startConditionResetSda();
    void startConditionResetScl();
 
    // WRITE BYTE
    void writeByte();
    void writeByteSetSdaDataBit();
    void writeByteSetScl();
    void writeByteResetScl();
 
    // READ BYTE
    void readByte();
    void readByteReadSdaDataBit();
    void readByteSetScl();
    void readByteResetScl();
 
    // ACKNOLAGE
    void checkAcknowledgeSetSdaInput();
    void checkAcknowledgeSetScl();
    void checkAcknowledgeResetScl();
    void setAcknowledgeSetSdaOutput();
    void setAcknowledgeSetScl();
    void setAcknowledgeResetScl();
    void finishAcknowledge();
    void finishAcknowledgeWriteOperation();
    void finishAcknowledgeReadOperation();
 
    // STOP CONDITION
    void stopConditionResetSda();
    void stopConditionSetScl();
    void stopConditionSetSda();
    void setFrequency(uint32_t hz);
 
    Gpio& m_scl;
    Gpio& m_sda;
    app::Timer& m_timer;
    uint8_t* m_data = nullptr;
    size_t m_dataSize = 0;
    size_t m_dataIndex = 0;
    uint8_t m_activeByte = 0;
    bool m_writingAddress = false;
    int8_t m_bitIndex = 7;
    CommunicationHardware::Frame m_lastFrame = CommunicationHardware::Frame::FirstAndLast;
    bool m_lastOperationWasWrite = false;
    bool m_acknowledgeBit = false;
    bool m_acknowledgeError = false;
    SEMF_SLOT(m_timemoutSlot, SoftI2cMaster, *this, resartConditionSetScl);
    static constexpr Error::ClassID kSemfClassId = Error::ClassID::SoftI2cMaster;
};
} /* namespace semf */
#endif /* SEMF_COMMUNICATION_SOFTI2CMASTER_H_ */