lis3dh/main.c
2024-01-01 13:08:06 +00:00

135 lines
3.9 KiB
C

/*
* SCLICK SCLICK
* _________ __________
* | | | | |
* | | | | |
* ----- ------------------ | ------
* |
* TIME_LIMIT TIME_LIMIT|
* >---------< >----------<|
* LATENCY WINDOW |
* >----------<>----------< | => DCLICK INT
* */
#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
#define GPIO_INTERRUPT_PIN_INT2 16
/* print message then exit */
static void quit(const char *msg, lis3dh_t *lis) {
lis->dev.deinit();
fprintf(stderr, "%s\n", msg);
exit(1);
}
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)) {
quit("init()", &lis);
}
/* reset device because it sometimes corrupts itself */
if (lis3dh_reset(&lis)) {
quit("reset()", &lis);
}
/* register interrupt */
if (int_register(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_register()", &lis);
}
/* 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 */
lis.cfg.filter.mode = LIS3DH_FILTER_MODE_NORMAL;
lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
lis.cfg.filter.click = 1; /* enable filtering for CLICK function */
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 */
lis.cfg.pin1.click = 1; /* enable click int src through pin1 */
lis.cfg.pin1.latch = 1;
/* 1 LSb = 16 mg @ FS_2G
* so a 0.072g 'shock' is 72/16 = 4.5
* However, the device can have up to +- 40mg read error
* 0.112g => 112/16 = 15
*/
lis.cfg.click_ths = 15; /* pretty sensitive */
/* 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:
* time_limit of 75 ms = 75/2.5 = 30
* time_latency of 40 ms = 40/2.5 = 16
* time_window of 500 ms = 500/2.5 = 200
*
*/
lis.cfg.time_limit = 30; /* range: 0-127 */
lis.cfg.time_latency = 16; /* range: 0-255 */
lis.cfg.time_window = 200; /* range: 0-255 */
/* write device config */
if (lis3dh_configure(&lis)) {
quit("configure()", &lis);
}
for(;;) {
/* poll interrupt on INT1 pin */
if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_poll()", &lis);
}
/* read CLICK_SRC when interrupt has fired */
if (lis3dh_read_click(&lis)) {
quit("read_click()", &lis);
}
/* only print data if DCLICK=1 in CLICK_SRC */
if (LIS3DH_CLICK_DCLICK(lis.src.click)) {
/* print data gathered from CLICK_SRC */
printf("Click: X=%d, Y=%d, Z=%d, Sign=%d, S_en=%d, D_en=%d\n",
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)) {
quit("int_unregister()", &lis);
}
/* deinitalise struct */
if (lis3dh_deinit(&lis)) {
quit("deinit()", &lis);
}
return 0;
}