xmodem.hh

#ifndef XMODEM_HH
#define XMODEM_HH
 
#include "openrtx_link.hh"

class XModem : public QObject
{
  Q_OBJECT
 
protected:
  enum class State {
    Init, Transfer, Error
  };

  enum CtrlByte {
    SOH = 0x01, STX = 0x02, EOT = 0x04, ACK = 0x06, NAK = 0x15, CAN = 0x18, CRC = 0x43
  };
 
public:
  explicit XModem(OpenRTXLinkStream *transferLayer, QObject *parent=nullptr);

  bool receive(QByteArray &buffer, int timeout=-1, const ErrorStack &err=ErrorStack());

  bool send(const QByteArray& buffer, int timeout=-1, const ErrorStack &err=ErrorStack());
 
protected:
  bool rxByte(uint8_t &b, int timeout=-1, const ErrorStack &err=ErrorStack());
  bool txByte(uint8_t b, int timeout=-1, const ErrorStack &err=ErrorStack());
  bool rxBytes(uint8_t *data, unsigned int size, int timeout=-1, const ErrorStack &err=ErrorStack());
  bool txBytes(const uint8_t *data, unsigned int size, int timeout=-1, const ErrorStack &err=ErrorStack());
  static uint16_t crc_ccitt(const QByteArray &data);
 
private:
  OpenRTXLinkStream *_link;
  State _state;
  unsigned int _maxRetry;
};
 
#endif // XMODEM_HH