lis3dh/main.c

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2.6 KiB
C
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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
#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();
fprintf(stderr, "%s\n", msg);
exit(1);
}
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int main() {
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;
lis.dev.read = i2c_read;
lis.dev.write = i2c_write;
lis.dev.sleep = usleep;
lis.dev.deinit = i2c_deinit;
/* initialise LIS3DH struct */
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if (lis3dh_init(&lis)) {
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quit("init()", &lis);
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}
/* reset device because it sometimes corrupts itself */
if (lis3dh_reset(&lis)) {
quit("reset()", &lis);
}
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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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/* 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;
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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.click.latch = 1;
lis.cfg.click.xs = 1;
lis.cfg.click.ys = 1;
lis.cfg.click.zs = 1;
lis.cfg.pin1.click = 1;
/* 1 LSb = 16 mg @ FS_2G
* so a 0.8g 'shock' is 800/16 = 50
*/
lis.cfg.click_ths = 50;
/* the 800 mg shock must be gone after 30 ms let's say .. */
/* 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
*
* At 400 ODR, 30ms/2.5ms = 16
*/
lis.cfg.time_limit = 16;
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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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if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_poll()", &lis);
}
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if (lis3dh_read_click(&lis)) {
quit("read_click()", &lis);
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}
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/* 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));
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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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}
/* deinitalise struct */
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if (lis3dh_deinit(&lis)) {
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quit("deinit()", &lis);
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}
return 0;
}