spi.go

package pigpio

type SPI struct {
	pi      *Pi
	handle  int
	flags   int
	baud    int
	channel int
}

func (s *SPI) Close() error {
	r, e := s.pi.socket.SendCommand(cmdSPIClose, s.handle, 0, nil)
	if e != nil || r < 0 {
		return newPiError(r, e, "Close(handle: %d)", s.handle)
	}

	return nil
}

func (s *SPI) Read(count int) ([]byte, error) {
	r, e := s.pi.socket.SendCommand(cmdSPIRead, s.handle, count, nil)
	if e != nil || r < 0 {
		return nil, newPiError(r, e, "Read(handle: %d, count: %d)", s.handle, count)
	}

	data, er := s.pi.socket.Read(r)
	if er != nil {
		return nil, newPiError(9, er, "Read(handle: %d, count: %d, bytes: %d)", s.handle, count, r)
	}

	return data, nil
}

func (s *SPI) Write(data []byte) error {
	r, e := s.pi.socket.SendCommand(cmdSPIWrite, s.handle, 0, data)
	if e != nil || r < 0 {
		return newPiError(r, e, "Write(handle: %d, data: %v)", s.handle, data)
	}

	return nil
}

func (s *SPI) Xfer(data []byte) ([]byte, error) {
	r, e := s.pi.socket.SendCommand(cmdSPIXfer, s.handle, 0, data)
	if e != nil || r < 0 {
		return nil, newPiError(r, e, "Xfer(handle: %d, data: %v)", s.handle, data)
	}

	data, er := s.pi.socket.Read(r)
	if er != nil {
		return nil, newPiError(9, er, "Xfer(handle: %d, data: %v, bytes: %d)", s.handle, data, r)
	}

	return data, nil
}