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max31856-spin

This is a P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for Maxim's MAX31856 SPI Thermocouple amplifier IC.

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

  • 4-wire SPI connection at up to 1MHz (P1), 5MHz (P2)
  • Reads on-chip cold-junction temperature sensor
  • Reads thermocouple
  • Supports automatic or one-shot conversion modes
  • Supports built-in cold-junction offset compensation
  • Supports 50/60Hz mains power frequency noise rejection
  • Supports setting temperature interrupt thresholds
  • Supports setting/checking for all fault types supported by the sensor
  • Supports setting thermocouple type

Requirements

P1/SPIN1:

  • spin-standard-library
  • 1 extra core/cog for the PASM SPI engine (none if the bytecode-based engine is used)
  • sensor.temp.common.spinh (provided by the spin-standard-library)

P2/SPIN2:

  • p2-spin-standard-library
  • sensor.temp.common.spin2h (provided by the p2-spin-standard-library)

Compiler Compatibility

Processor Language Compiler Backend Status
P1 SPIN1 FlexSpin (6.9.4) Bytecode OK
P1 SPIN1 FlexSpin (6.9.4) Native/PASM OK
P2 SPIN2 FlexSpin (6.9.4) NuCode Untested
P2 SPIN2 FlexSpin (6.9.4) Native/PASM2 OK

(other versions or toolchains not listed are not supported, and may or may not work)

Limitations

  • The chip has no known identification register, so the driver will start successfully as long as the SPI engine does