71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
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#define _GNU_SOURCE /* usleep() */
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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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struct lis3dh_fifo_data fifo;
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int i;
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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 struct and check device id */
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if (lis3dh_init(&lis)) {
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/* error handling */
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}
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/* reset 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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lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_FIFO;
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/* modifying the size of the FIFO buffer is not useful when just polling without interrupts */
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/* write cfg to device */
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if (lis3dh_configure(&lis)) {
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/* error handling */
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}
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for ( ;; ) {
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/* read FIFO into `fifo_data' struct `fifo' */
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if (lis3dh_read_fifo(&lis, &fifo)) {
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/* error handling */
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}
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/* print data .. */
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for(i=0; i<fifo.size; i++) {
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printf("x: %4.4d mg, y: %4.4d mg, z: %4.4d mg\n", fifo.x[i], fifo.y[i], fifo.z[i]);
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}
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/* FIFO size will rarely go above 2 in this example, because lis3dh_read_fifo() */
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/* does not wait for the FIFO buffer to be full, just non-empty. */
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printf("fifo.size=%d\n", fifo.size);
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/* Since the WTM is less than the full size, there is no need to reset the device after reading */
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/* However, if the reading of the device is somehow delayed and the FIFO fills up between */
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/* calls to lis3dh_read_fifo(), then the device is overrun, and must be reset. */
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/* this can easily be simulated by calling a sleep function. */
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/* Therefore, it is a good idea to reset the FIFO anyway. */
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lis3dh_fifo_reset(&lis);
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}
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/* deinitalise device */
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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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}
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