135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* SCLICK SCLICK
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* _________ __________
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* | | | | |
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* | | | | |
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* ----- ------------------ | ------
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* |
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* TIME_LIMIT TIME_LIMIT|
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* >---------< >----------<|
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* LATENCY WINDOW |
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* >----------<>----------< | => DCLICK INT
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* */
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <math.h>
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#include "lis3dh.h"
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#include "interrupt.h"
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#include "i2c.h"
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#define GPIO_INTERRUPT_PIN_INT1 12
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#define GPIO_INTERRUPT_PIN_INT2 16
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/* print message then exit */
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static void quit(const char *msg, lis3dh_t *lis) {
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lis->dev.deinit();
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fprintf(stderr, "%s\n", msg);
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exit(1);
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}
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int main() {
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lis3dh_t lis;
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/* set fn ptrs to rw on bus (i2c or SPI) */
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lis.dev.init = i2c_init;
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lis.dev.read = i2c_read;
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lis.dev.write = i2c_write;
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lis.dev.sleep = usleep;
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lis.dev.deinit = i2c_deinit;
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/* initialise LIS3DH struct */
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if (lis3dh_init(&lis)) {
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quit("init()", &lis);
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}
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/* reset device because it sometimes corrupts itself */
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if (lis3dh_reset(&lis)) {
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quit("reset()", &lis);
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}
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/* register interrupt */
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if (int_register(GPIO_INTERRUPT_PIN_INT1)) {
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quit("int_register()", &lis);
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}
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/* set up config */
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lis.cfg.mode = LIS3DH_MODE_HR;
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lis.cfg.range = LIS3DH_FS_2G;
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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;
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lis.cfg.filter.click = 1; /* enable filtering for CLICK function */
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lis.cfg.click.xd = 1; /* enable X axis double click */
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lis.cfg.click.yd = 1; /* enable Y axis double click */
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lis.cfg.click.zd = 1; /* enable Z axis double click */
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lis.cfg.pin1.click = 1; /* enable click int src through pin1 */
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lis.cfg.pin1.latch = 1;
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/* 1 LSb = 16 mg @ FS_2G
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* so a 0.072g 'shock' is 72/16 = 4.5
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* However, the device can have up to +- 40mg read error
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* 0.112g => 112/16 = 15
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*/
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lis.cfg.click_ths = 15; /* pretty sensitive */
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/* Duration time is measured in N/ODR where:
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* --- N = The content of the intX_dur integer
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* --- ODR = the data rate, eg 100, 400...
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* [ODR] [1 LSb in milliseconds]
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* 400 2.5
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*
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* For ODR=400:
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* time_limit of 75 ms = 75/2.5 = 30
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* 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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*
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*/
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lis.cfg.time_limit = 30; /* range: 0-127 */
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lis.cfg.time_latency = 16; /* range: 0-255 */
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lis.cfg.time_window = 200; /* range: 0-255 */
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/* write device config */
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if (lis3dh_configure(&lis)) {
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quit("configure()", &lis);
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}
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for(;;) {
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/* poll interrupt on INT1 pin */
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if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
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quit("int_poll()", &lis);
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}
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/* read CLICK_SRC when interrupt has fired */
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if (lis3dh_read_click(&lis)) {
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quit("read_click()", &lis);
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}
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/* only print data if DCLICK=1 in CLICK_SRC */
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if (LIS3DH_CLICK_DCLICK(lis.src.click)) {
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/* print data gathered from CLICK_SRC */
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printf("Click: X=%d, Y=%d, Z=%d, Sign=%d, S_en=%d, D_en=%d\n",
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LIS3DH_CLICK_SRC_X(lis.src.click),
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LIS3DH_CLICK_SRC_Y(lis.src.click),
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LIS3DH_CLICK_SRC_Z(lis.src.click),
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LIS3DH_CLICK_SIGN(lis.src.click),
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LIS3DH_CLICK_SCLICK(lis.src.click),
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LIS3DH_CLICK_DCLICK(lis.src.click));
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}
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}
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/* unregister interrupt */
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if (int_unregister(GPIO_INTERRUPT_PIN_INT1)) {
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quit("int_unregister()", &lis);
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}
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/* deinitalise struct */
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if (lis3dh_deinit(&lis)) {
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quit("deinit()", &lis);
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}
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return 0;
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} |