AN4506 datasheet(31/47 Pages) STMICROELECTRONICS

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AN4506

Interrupt generation

DocID026442 Rev 2

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This paragraph provides the basics for the use of the selective axis movement detection

feature. Here below is reported the example code which implements the SW routine for the

selective axis movement recognition:

The code sample exploits a threshold set at 60 dps selective axis movement detection and

the event is notified by the hardware signal INT1. At step 7, the IG_DURATION register is

configured like this to ignore events that are shorter than 1/DR = 1/100 ~= 10 msec in order

to avoid false detections. Once the selective axis movement detection has occurred, a read

of the IG_SRC register clears the request and the device is ready to recognize other events.

Write 0Fh into CTRL1

// Turn on the sensor and enable X, Y, and Z

// ODR = 100 Hz

Write 80h into CTRL3

// Interrupt driven to INT1 pad

Write 00h into CTRL4

// FS = 245 dps

Write 1Fh into IG_THS_XH

// Threshold = 60 dps

Write 58h into IG_THS_XL

// Threshold = 60 dps

Write 1Fh into IG_THS_YH

// Threshold = 60 dps

Write 58h into IG_THS_YL

// Threshold = 60 dps

10 Write 1Fh into IG_THS_ZH

// Threshold = 60 dps

Write 58h into IG_THS_ZL

// Threshold = 60 dps

12 Write 01h into IG_DURATION

// Duration = 10 ms

13 Write 65h into IG_CFG

// Enable XL, YL and ZH interrupt generation in AND

// configuration. Interrupt latched

14 Poll INT1 pad; if INT1=0 then go to 8

// Poll INT1 pin waiting for the

// wake-up event

15 Read IG_SRC

// Return the event that has triggered the

// interrupt

(Wake-up event has occurred; insert

your code here)

// Event handling

17 Go to 15

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