AN4505 datasheet(28/43 Pages) STMICROELECTRONICS

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Interrupt generation

AN4505

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DocID026441 Rev 1

Figure 15. No-move interrupt

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

feature. The example code which implements the SW routine for the selective axis

movement recognition is given below.

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 12, the INT1_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 INT1_SRC register clears the request and the device is ready to recognize other

events.

Write 0Fh into CTRL_REG1

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

// ODR = 100 Hz

Write 80h into CTRL_REG3

// Interrupt driven to INT1 pad

Write 00h into CTRL_REG4

// FS = 250 dps

Write 2Ch into INT1_THS_XH

// Threshold = 60 dps

Write A4h into INT1_THS_XL

// Threshold = 60 dps

Write 2Ch into INT1_THS_YH

// Threshold = 60 dps

Write A4h into INT1_THS_YL

// Threshold = 60 dps

10 Write 2Ch into INT1_THS_ZH

// Threshold = 60 dps

Write A4h into INT1_THS_ZL

// Threshold = 60 dps

12 Write 01h into INT1_DURATION

// Duration = 10 ms

13 Write 65h into INT1_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 INT1_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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