1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CROS_EC_ACCELGYRO_H
#define __CROS_EC_ACCELGYRO_H
#include "motion_sense.h"
/* Header file for accelerometer / gyro drivers. */
/* Number of counts from accelerometer that represents 1G acceleration. */
#define ACCEL_G 1024
struct accelgyro_drv {
/**
* Initialize accelerometers.
* @s Pointer to sensor data pointer. Sensor data will be
* allocated on success.
* @return EC_SUCCESS if successful, non-zero if error.
*/
int (*init)(const struct motion_sensor_t *s);
/**
* Read all three accelerations of an accelerometer. Note that all
* three accelerations come back in counts, where ACCEL_G can be used
* to convert counts to engineering units.
* @s Pointer to sensor data.
* @v Vector to store acceleration (in units of counts).
* @return EC_SUCCESS if successful, non-zero if error.
*/
int (*read)(const struct motion_sensor_t *s, vector_3_t v);
/**
* Setter and getter methods for the sensor range. The sensor range
* defines the maximum value that can be returned from read(). As the
* range increases, the resolution gets worse.
* @s Pointer to sensor data.
* @range Range (Units are +/- G's for accel, +/- deg/s for gyro)
* @rnd Rounding flag. If true, it rounds up to nearest valid
* value. Otherwise, it rounds down.
* @return EC_SUCCESS if successful, non-zero if error.
*/
int (*set_range)(const struct motion_sensor_t *s,
int range,
int rnd);
int (*get_range)(const struct motion_sensor_t *s,
int *range);
/**
* Setter and getter methods for the sensor resolution.
* @s Pointer to sensor data.
* @range Resolution (Units are number of bits)
* param rnd Rounding flag. If true, it rounds up to nearest valid
* value. Otherwise, it rounds down.
* @return EC_SUCCESS if successful, non-zero if error.
*/
int (*set_resolution)(const struct motion_sensor_t *s,
int res,
int rnd);
int (*get_resolution)(const struct motion_sensor_t *s,
int *res);
/**
* Setter and getter methods for the sensor output data range. As the
* ODR increases, the LPF roll-off frequency also increases.
* @s Pointer to sensor data.
* @rate Output data rate (units are milli-Hz)
* @rnd Rounding flag. If true, it rounds up to nearest valid
* value. Otherwise, it rounds down.
* @return EC_SUCCESS if successful, non-zero if error.
*/
int (*set_data_rate)(const struct motion_sensor_t *s,
int rate,
int rnd);
int (*get_data_rate)(const struct motion_sensor_t *s,
int *rate);
#ifdef CONFIG_ACCEL_INTERRUPTS
/**
* Setup a one-time accel interrupt. If the threshold is low enough, the
* interrupt may trigger due simply to noise and not any real motion.
* If the threshold is 0, the interrupt will fire immediately.
* @s Pointer to sensor data.
* @threshold Threshold for interrupt in units of counts.
*/
int (*set_interrupt)(const struct motion_sensor_t *s,
unsigned int threshold);
#endif
};
#endif /* __CROS_EC_ACCELGYRO_H */
|
