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cc1101-spin's Introduction

cc1101-spin


This is a P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for Texas Instruments CC1101 low-power ISM-band (sub-1GHz) RF transceiver.

IMPORTANT: This software is meant to be used with the spin-standard-library (P8X32A) or p2-spin-standard-library (P2X8C4M64P). Please install the applicable library first before attempting to use this code, otherwise you will be missing several files required to build the project.

Salient Features

  • SPI connection at up to 1MHz (P1), ~5MHz (P2)
  • Over-the-air (OTA) data rate from 600 Baud to 500kBaud
  • 2FSK, 4FSK, GFSK, ASK/OOK, MSK modulation formats
  • Set common RF parameters: Receive bandwidth, IF, carrier freq, DC block filter, RX Gain, TX power, FSK deviation freq, channel spacing
  • Set number of preamble bytes
  • Set function of CC1101's GPIO pins
  • Address filtering
  • Options for increasing transmission robustness: Data whitening, Manchester encoding, FEC, syncword
  • RSSI measurement

Requirements

P1/SPIN1:

  • spin-standard-library
  • P1: 1 extra core/cog for the PASM SPI engine (none if bytecode-based engine is used)

P2/SPIN2:

  • p2-spin-standard-library

Compiler Compatibility

Processor Language Compiler Backend Status
P1 SPIN1 FlexSpin (6.1.1) Bytecode OK
P1 SPIN1 FlexSpin (6.1.1) Native code OK
P1 SPIN1 OpenSpin (1.00.81) Bytecode Untested (deprecated)
P2 SPIN2 FlexSpin (6.1.1) NuCode FTBFS
P2 SPIN2 FlexSpin (6.1.1) Native code OK
P1 SPIN1 Brad's Spin Tool (any) Bytecode Unsupported
P1, P2 SPIN1, 2 Propeller Tool (any) Bytecode Unsupported
P1, P2 SPIN1, 2 PNut (any) Bytecode Unsupported

Limitations

  • TBD

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cc1101-spin's Issues

Finer-grained control over baudrate

DataRate() currently gets register settings for various pre-defined baudrates that are more commonly used, but it should be possible to rewrite it to calculate the register values, allowing the full range of data rates, and should consume less memory than LUTs.

Set carrier frequency inaccurate

The carrier frequency set in the driver doesn't seem to be very accurate.
For example, when set to 433900000, the signal seems to be centered on approx 433870000.
I may have missed a crucial step related to the device's on-chip calibration, or some other setting. I have two identical brand/model test units that have approx the same offset.

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