73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
#define _GNU_SOURCE
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#include <unistd.h> /* usleep() */
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#include <stdio.h>
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#include "lis3dh.h"
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#include "i2c.h"
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int main() {
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lis3dh_t lis;
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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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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_100_HZ;
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/* normal mode */
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lis.cfg.filter.mode = LIS3DH_FILTER_MODE_REFERENCE;
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/* 3dB cutoff freq (~ ODR) */
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lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
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/* Output [x y z] data is calculated as the difference between the
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* measured acceleration and the value stored in REFERENCE.
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* signed 7-bit int, 1 LSb value depends on FS.
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* FS_2G: ~ 16mg per 1 LSb
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* FS_4G: ~ 31mg per 1 LSb
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* FS_8G: ~ 63mg per 1 LSb
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* FS_16G: ~127mg per 1 LSb */
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/* @ 2G,
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* To have the output data be referenced to 0.8g:
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* => 800 mg / 16 mg = 50 */
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/* to reference -0.8g simply put -50 */
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lis.cfg.reference = 50;
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/* write config to device */
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if (lis3dh_configure(&lis)) {
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/* error handling */
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}
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/* Do not read REFERENCE */
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for ( ;; ) {
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/* read an [x y z] accel set. Filter is applied */
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if (lis3dh_read(&lis)) {
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/* error handling */
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}
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printf("x: %4.d, y: %4.d, z: %4.d\n", lis.acc.x, lis.acc.y, lis.acc.z);
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usleep(5000); /* 5 ms */
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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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} |