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single click detection

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This commit is contained in:
William Clark 2024-01-01 11:05:45 +00:00
parent d1ab5a8d99
commit 1a54ce4e5e
1 changed files with 37 additions and 48 deletions
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75
main.c
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@ -10,11 +10,6 @@
#define GPIO_INTERRUPT_PIN_INT1 12 #define GPIO_INTERRUPT_PIN_INT1 12
#define GPIO_INTERRUPT_PIN_INT2 16 #define GPIO_INTERRUPT_PIN_INT2 16
/* calc magnitude of accel [x y z] vector */
static float mag(float x, float y, float z) {
return sqrt( powf(x, 2) + powf(y, 2) + powf(z, 2) );
}
/* print message then exit */ /* print message then exit */
static void quit(const char *msg, lis3dh_t *lis) { static void quit(const char *msg, lis3dh_t *lis) {
lis->dev.deinit(); lis->dev.deinit();
@ -25,8 +20,6 @@ static void quit(const char *msg, lis3dh_t *lis) {
int main() { int main() {
lis3dh_t lis; lis3dh_t lis;
struct lis3dh_fifo_data fifo;
int i, k;
/* set fn ptrs to rw on bus (i2c or SPI) */ /* set fn ptrs to rw on bus (i2c or SPI) */
lis.dev.init = i2c_init; lis.dev.init = i2c_init;
@ -51,58 +44,54 @@ int main() {
} }
/* set up config */ /* set up config */
lis.cfg.mode = LIS3DH_MODE_NORMAL; lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_2G; lis.cfg.range = LIS3DH_FS_2G;
lis.cfg.rate = LIS3DH_ODR_100_HZ; lis.cfg.rate = LIS3DH_ODR_400_HZ;
lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_STREAM;
lis.cfg.fifo.trig = LIS3DH_FIFO_TRIG_INT2;
lis.cfg.pin1.wtm = 1;
lis.cfg.pin1.latch = 1;
lis.cfg.filter.mode = LIS3DH_FILTER_MODE_NORMAL; lis.cfg.filter.mode = LIS3DH_FILTER_MODE_NORMAL;
lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8; lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
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;
lis.cfg.en_adc = 1; /* 1 LSb = 16 mg @ FS_2G
lis.cfg.en_temp = 1; * 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;
/* write device config */ /* write device config */
if (lis3dh_configure(&lis)) { if (lis3dh_configure(&lis)) {
quit("configure()", &lis); quit("configure()", &lis);
} }
for(i=0; i<50; i++) {
/* wait for interrupt from LIS3DH */
if (int_poll(GPIO_INTERRUPT_PIN_INT1)) { if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_poll()", &lis); quit("int_poll()", &lis);
} }
/* clear latched interrupt on INT1 */ if (lis3dh_read_click(&lis)) {
if (lis3dh_read_int1(&lis)) { quit("read_click()", &lis);
quit("clear_int1()", &lis);
} }
/* read stored fifo data into `fifo' struct */ /* print data gathered from CLICK_SRC */
if (lis3dh_read_fifo(&lis, &fifo)) { printf("Click: X=%d, Y=%d, Z=%d, Sign=%d, S_en=%d, D_en=%d\n",
quit("read_fifo()", &lis); LIS3DH_CLICK_SRC_X(lis.src.click),
} LIS3DH_CLICK_SRC_Y(lis.src.click),
LIS3DH_CLICK_SRC_Z(lis.src.click),
/* read ADCs */ LIS3DH_CLICK_SIGN(lis.src.click),
if (lis3dh_read_adc(&lis)) { LIS3DH_CLICK_SCLICK(lis.src.click),
quit("read_adc()", &lis); LIS3DH_CLICK_DCLICK(lis.src.click));
}
/* read temp from ADC3 and overwrite local ADC reading for ADC3 */
if (lis3dh_read_temp(&lis)) {
quit("read_temp()", &lis);
}
for(k=0; k<fifo.size; k++) {
printf("x: %04.04f y: %04.04f z: %04.04f mag: %04.04f ADC1:%.1f, ADC2:%.1f, ADC3:%.1f\n",
fifo.x[k], fifo.y[k], fifo.z[k],
mag(fifo.x[k], fifo.y[k], fifo.z[k]),
lis.adc.adc1, lis.adc.adc2, lis.adc.adc3);
}
}
/* unregister interrupt */ /* unregister interrupt */
if (int_unregister(GPIO_INTERRUPT_PIN_INT1)) { if (int_unregister(GPIO_INTERRUPT_PIN_INT1)) {