lis3dh/example/double-click.c

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/*
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* SCLICK SCLICK
* __________ ___________
* | | | | |
* | | | | |
* ----- -------------------- | ------
* |
* TIME_LIMIT TIME_LIMIT |
* >---------< >--------< | ==> DCLICK_INT
* LATENCY WINDOW >----|---<
* >----------<>----------< LATENCY
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* */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include "lis3dh.h"
#include "interrupt.h"
#include "i2c.h"
#define GPIO_INTERRUPT_PIN_INT1 12
int main() {
lis3dh_t lis;
/* set fn ptrs to rw on bus (i2c or SPI) */
lis.dev.init = i2c_init;
lis.dev.read = i2c_read;
lis.dev.write = i2c_write;
lis.dev.sleep = usleep;
lis.dev.deinit = i2c_deinit;
/* initialise LIS3DH struct */
if (lis3dh_init(&lis)) {
/* error handling */
}
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/* reset device just in case */
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if (lis3dh_reset(&lis)) {
/* error handling */
}
/* register interrupt */
if (int_register(GPIO_INTERRUPT_PIN_INT1)) {
/* error handling */
}
/* set up config */
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_2G;
lis.cfg.rate = LIS3DH_ODR_400_HZ; /* minimum recommended ODR */
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lis.cfg.filter.mode = LIS3DH_FILTER_MODE_NORMAL;
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lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
lis.cfg.filter.click = 1; /* enable filtering for CLICK function */
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lis.cfg.click.xd = 1; /* enable X axis double click */
lis.cfg.click.yd = 1; /* enable Y axis double click */
lis.cfg.click.zd = 1; /* enable Z axis double click */
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lis.cfg.pin1.click = 1; /* enable CLICK INT through pin1 */
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/* 1 LSb = 16 mg @ FS_2G
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* so a 0.3g 'shock' is 300/16 = 18.75
* However, the device can have up to +- 40mg read error, so add 40mg
* 0.34g => 340/16 ~= 21
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*/
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lis.cfg.click_ths = 21;
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/* Duration time is measured in N/ODR where:
* --- N = The content of the intX_dur integer
* --- ODR = the data rate, eg 100, 400...
* [ODR] [1 LSb in milliseconds]
* 400 2.5
*
* For ODR=400:
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* time_limit of 75 ms = 75/2.5 = 30
* time_latency of 40 ms = 40/2.5 = 16
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* time_window of 500 ms = 500/2.5 = 200
*
*/
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lis.cfg.time_limit = 30; /* range: 0-127 */
lis.cfg.time_latency = 16; /* range: 0-255 */
lis.cfg.time_window = 200; /* range: 0-255 */
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/* write device config */
if (lis3dh_configure(&lis)) {
/* error handling */
}
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/* read REFERENCE to set filter to current accel field */
if (lis3dh_reference(&lis)) {
/* error handling */
}
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/* read CLICK_SRC to clear previous interrupts, if any */
if (lis3dh_read_click(&lis)) {
/* error handling */
}
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for(;;) {
/* poll interrupt on INT1 pin */
if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
/* error handling */
}
/* read CLICK_SRC when interrupt has fired */
if (lis3dh_read_click(&lis)) {
/* error handling */
}
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/* only print if DCLICK=1 */
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if (LIS3DH_CLICK_DCLICK(lis.src.click)) {
/* print data gathered from CLICK_SRC */
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printf("Click: X=%d, Y=%d, Z=%d, Sign=%d, S_CLICK=%d, D_CLICK=%d\n",
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LIS3DH_CLICK_SRC_X(lis.src.click),
LIS3DH_CLICK_SRC_Y(lis.src.click),
LIS3DH_CLICK_SRC_Z(lis.src.click),
LIS3DH_CLICK_SIGN(lis.src.click),
LIS3DH_CLICK_SCLICK(lis.src.click),
LIS3DH_CLICK_DCLICK(lis.src.click));
}
}
/* unregister interrupt */
if (int_unregister(GPIO_INTERRUPT_PIN_INT1)) {
/* error handling */
}
/* deinitalise struct */
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}