ModbusInstrument.h

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* libscopehal                                                                                                          *
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#ifndef ModbusInstrument_h
#define ModbusInstrument_h
 
class ModbusInstrument  : public virtual SCPIInstrument, public BinaryDriver
{
public:
    ModbusInstrument(SCPITransport* transport, uint8_t slaveAdress=1);
    virtual ~ModbusInstrument();
 
    virtual uint16_t ReadRegister(uint16_t address);
    virtual uint16_t WriteRegister(uint16_t address, uint16_t value);
    virtual uint8_t ReadRegisters(uint16_t address, std::vector<uint16_t>* data, uint8_t count);
 
protected:
    enum ModbusFunction : uint8_t
    {
        // Reading functions
        ReadDiscreteOutputCoils = 0x01,
        ReadDiscreteInputContacts = 0x02,
        ReadAnalogOutputHoldingRegisters = 0x03,
        ReadAnalogInputRegisters = 0x04,
 
        // Single write functions
        WriteSingleDiscreteOutputCoil = 0x05,
        WriteSingleAnalogOutputRegister = 0x06,
 
        // Multiple write functions
        WriteMultipleDiscreteOutputCoils = 0x0F,
        WriteMultipleAnalogOutputHoldingRegisters = 0x10,
 
        // User defined
        Undefined = 0x00
    };
 
    // Make sure several request don't collide before we received the corresponding response
    std::recursive_mutex m_modbusMutex;
 
    uint8_t m_slaveAdress;
    void Converse(ModbusFunction function, std::vector<uint8_t>* data);
    void SendCommand(ModbusFunction function, const std::vector<uint8_t> &data);
    void ReadResponse(ModbusFunction function, std::vector<uint8_t>* data);
};
 
#endif