select spi bus & chip-select line

Added

• select arbitrary device via CC1101(spi_bus=?, spi_chip_select=?)
• added explanation to PermissionError on SpiDev.open()

preamble & sync word

Added

• method .get_sync_word()
• method .set_sync_word()
• method .get_preamble_length_bytes()
• method .set_preamble_length_bytes()
• preamble length & sync word in string representation

length byte

Changed

• transmit(): prepend length byte in variable packet length mode internally
  to avoid accidental incomplete transmissions and TX FIFO underflows

fixed packet length mode

Added

• support for fixed packet length mode
  via new method set_packet_length_mode(PacketLengthMode.FIXED)
• new enum options.PacketLengthMode
• new method get_packet_length_mode()
• method get_packet_length_bytes() is now public
• new method set_packet_length_bytes()
• added configured packet length to CC1101's string representation
  (≤n indicates variable length mode, =n fixed length mode)

disable checksum

Added

• method disable_checksum() to disable automatic CRC sum
  appending in TX mode and checking in RX mode

first release

Added

• CC1101 class providing
  • context manager to open SPI port
  • transmit() for buffered transmission
  • context manager asynchronous_transmission() for manual signal generation
  • get_configuration_register_values() to read all configuration registers
• OOK modulation
• configurable symbol rate & sync mode
• optional manchester encoding
• disabled data whitening
• automatic calibration