example_accelerometer_interrupt.c File Reference

Configures accelerometer to generate an interrupt when motion is detected. More...

#include "../HAL/hal_cc2530znp_target_board.h"
#include "msp430x22x4.h"
#include <stdarg.h>

void(*	accelerometerIsr )(void)
void	handleAccelerometer ()
int	main (void)

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Detailed Description

Configures accelerometer to generate an interrupt when motion is detected.

Configures accelerometer to be in motion detect mode with default threshold & time settings to interrupt the MSP430 upon detection of motion. Displays the cause of the motion interrupt (X-axis, Y-axis, or Z-axis). Uses the Hardware Abstraction Layer (hal) to access the accelerometer. Configures Accelerometer with the following settings:

• Range = 2g
• Disable I2C
• Motion Detection Mode
• Stay in motion detection mode after interrupt.

Note:

to clear accelerometer interrupt, must read the Interrupt Status register.

to change the motion detection threshold, modify register ACCEL_MDTHR.

to change the motion time threshold, modify register ACCEL_MDFFTMR

See also:

VTI Technologies document: CMA3000-D01 datasheet

VTI Technologies document: Product Family Specification, CMA3000-D0X Series 3-axis accelerometer

VTI Technologies document: Interfacing CMA3000-D01 to an MSP430 ultra low-power microcontroller

http://processors.wiki.ti.com/index.php/Tutorial_on_the_Examples and http://e2e.ti.com/support/low_power_rf/default.aspx

Rev

719

Author

dsmith

Date

2010-08-19 10:52:09 -0700 (Thu, 19 Aug 2010)

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Function Documentation

void handleAccelerometer

(

)

Our Interrupt Service Routine (ISR) for Accelerometer Interrupt

Accelerometer interrupt service routine.

Note:

application must ensure that other operations are not accessing the accelerometer when interrupt fires. (Disable accelerometer interrupt during other communications with accelerometer, or even better, set a flag in the ISR that gets polled by your main application)

Precondition:

accelerometerIsr function pointer points here; e.g. accelerometerIsr =

global interrupts enabled

accelerometer interrupt enabled; e.g. halEnableAccelerometerInterrupt(NO_WAKEUP);

Postcondition:

interrupt is cleared

Handles Accelerometer interrupt

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Variable Documentation

void(* accelerometerIsr)(void)

Function pointer points to the function that will be called upon Accelerator Interrupt