132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
#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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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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/* error handling */
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}
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/* reset device just in case */
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if (lis3dh_reset(&lis)) {
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/* error handling */
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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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/* error handling */
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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;
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lis.cfg.pin1.ia1 = 1; /* allow INT1 through INT_PIN1 */
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/* 1 LSb = 16 mg @ FS_2G
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* 0.3g threshold = 300/16 = 18.75
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* add read error, +40mg => 340/16 = 21.25 ~= 21
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* if you for some reason don't want to use the HP filter,
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* just add 1g to the threshold calculation.
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*/
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lis.cfg.int1_ths = 21;
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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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* 10 ms => 10/2.5 = 5
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* lis.cfg.int1_dur = 5; <== 10 ms minimum duration to wake up
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*/
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lis.cfg.int1_dur = 0; /* instantaneous */
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/* enable X_high, Y_high and Z_high */
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lis.cfg.int1.yh = 1;
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lis.cfg.int1.zh = 1;
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lis.cfg.int1.xh = 1;
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/* OR mode. Think about the axis combinations for AND mode */
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lis.cfg.int1.aoi = 0; /* set to 1 for AND mode */
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lis.cfg.int1.en_6d = 0;
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/* latch interrupt */
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lis.cfg.int1.latch = 1;
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/* set up a HP filter to ignore constant earth acceleration */
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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.ia1 = 1; /* enable filter for INT1 generator */
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/* write device config */
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if (lis3dh_configure(&lis)) {
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/* error handling */
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}
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/* read REFERENCE to set filter to current accel field */
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if (lis3dh_reference(&lis)) {
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/* error handling */
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}
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/* read INT1_SRC to clear old interrupt if any */
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if (lis3dh_read_int1(&lis)) {
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/* error handling */
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}
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for( ;; ) {
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/* wait for INT1 to go active */
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if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
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/* error handling */
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}
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/* read INT1_SRC */
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if (lis3dh_read_int1(&lis)) {
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/* error handling */
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}
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/* print received interrupt .. */
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printf("IA=%d ZH=%d ZL=%d YH=%d YL=%d XH=%d XL=%d\n",
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LIS3DH_INT_SRC_IA(lis.src.int1),
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LIS3DH_INT_SRC_Z_HIGH(lis.src.int1),
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LIS3DH_INT_SRC_Z_LOW(lis.src.int1),
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LIS3DH_INT_SRC_Y_HIGH(lis.src.int1),
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LIS3DH_INT_SRC_Y_LOW(lis.src.int1),
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LIS3DH_INT_SRC_X_HIGH(lis.src.int1),
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LIS3DH_INT_SRC_X_LOW(lis.src.int1));
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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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/* error handling */
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}
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/* deinitalise struct */
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if (lis3dh_deinit(&lis)) {
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/* error handling */
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}
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return 0;
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} |