/GMA303-Motion-Demo-nRF51-DK

Demonstrate usage of motion algorithms with GMA303

Primary LanguageC

nRF51-DK + GMA303 Motion Demo

Demonstrate usage of motion algorithms with GMA303

  • Pedometer
  • Calories
  • Activity
  • Fall-down
  • Shake
  • Hand-raise
  • Flip
  • Sedentary
  • Sleep cycle

Requirements

  • nRF51-DK
  • nRF51 SDK: tested with Version 10.0.0
  • GCC ARM embedded compiler: tested with gcc-arm-none-eabi-4_9-2015q1-20150306
  • GMA303

I2C Connections

  • Use I2C0
    • SCL: P0.07
    • SDA: P0.30
  • I2C 7-bit slave address: 0x18

Makefile

  • Modify the location of the SDK to your actual directory
#
# The base directory for nRF51 SDK
#
nRF51_SDK_ROOT := /C/Data/nRF51_SDK/V10_0_0
  • Modify the location of the GNU tools to your actual directory
GNU_INSTALL_ROOT := C:/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q1

  • Execute make all to build and flash the program

  • Exectute make help for available targets

Sensor Layout Pattern

Sensor layout pattern is defined by the following macro in the "main.c"

#define ACC_LAYOUT_PATTERN          PAT6                 //accelerometer layout pattern

Please refer to the "Sensor_Layout_Pattern_Definition.pdf" document for the definition and modify accordingly to fit your actual layout.

Default gma303_initialization function in gma303.c

Default initialization steps:

  • Turn on offset temperature compensation
  • Set to continuous mode
  • Turn on low pass filter
  • Set data ready INT, ative high, push-pull

You may change the behavior of this initialization function to suit your purpose. Please refer to datasheet for more details on the register settings.

Usage of AutoNil

  • The program will do an offset AutoNil when executed. Hold the g-sensor steady and maintain in level, then press 'y' after the program prompt for input.
  • You may change the DATA_AVE_NUM macro in the gSensor_autoNil.h for the moving averae order for the offset estimation. Defautl is 32.