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Parallax P8X32A/Propeller driver object for the NXP MMA7455 3-axis Accelerometer

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mma7455-spin


This is a P8X32A/Propeller driver object for the NXP MMA7455 3DoF accelerometer

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

  • I2C connection at up to 400kHz
  • Alternate I2C address support (NOTE: This is device-dependent, and must have been factory programmed to function)
  • Read raw accelerometer data, or data in micro-g's
  • Change operating mode (standby, measure, level detection, pulse detection)
  • Data ready and overrun flags
  • Perform calibration and store results in on-chip (volatile) offset registers
  • Interrupts: set threshold, read flags, clear INT1/INT2 state

Requirements

P1/SPIN1:

  • spin-standard-library
  • P1/SPIN1: 1 extra core/cog for the PASM I2C engine
  • sensor.accel.common.spinh (provided by spin-standard-library)

P2/SPIN2:

  • p2-spin-standard-library
  • sensor.accel.common.spin2h (provided by 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

  • Alternate I2C address functionality must have been programmed by the manufacturer in order to function (HW limitation)

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Parallax P8X32A/Propeller driver object for the NXP MMA7455 3-axis Accelerometer

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