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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file drv_mixer.h
*
* Mixer ioctl interfaces.
*
* Normal workflow is:
*
* - open mixer device
* - add mixer(s)
* loop:
* - mix actuators to array
*
* Each client has its own configuration.
*
* When mixing, outputs are produced by mixers in the order they are
* added. A simple mixer produces one output; a multotor mixer will
* produce several outputs, etc.
*/
#ifndef _DRV_MIXER_H
#define _DRV_MIXER_H
#include <stdint.h>
#include <sys/ioctl.h>
#define MIXER0_DEVICE_PATH "/dev/mixer0"
/*
* ioctl() definitions
*/
#define _MIXERIOCBASE (0x2500)
#define _MIXERIOC(_n) (_IOC(_MIXERIOCBASE, _n))
/** get the number of mixable outputs */
#define MIXERIOCGETOUTPUTCOUNT _MIXERIOC(0)
/** reset (clear) the mixer configuration */
#define MIXERIOCRESET _MIXERIOC(1)
/** simple channel scaler */
struct mixer_scaler_s {
float negative_scale;
float positive_scale;
float offset;
float min_output;
float max_output;
};
/** mixer input */
struct mixer_control_s {
uint8_t control_group; /**< group from which the input reads */
uint8_t control_index; /**< index within the control group */
struct mixer_scaler_s scaler; /**< scaling applied to the input before use */
};
/** simple mixer */
struct mixer_simple_s {
uint8_t control_count; /**< number of inputs */
struct mixer_scaler_s output_scaler; /**< scaling for the output */
struct mixer_control_s controls[0]; /**< actual size of the array is set by control_count */
};
#define MIXER_SIMPLE_SIZE(_icount) (sizeof(struct mixer_simple_s) + (_icount) * sizeof(struct mixer_control_s))
/**
* add a simple mixer in (struct mixer_simple_s *)arg
*/
#define MIXERIOCADDSIMPLE _MIXERIOC(2)
/* _MIXERIOC(3) was deprecated */
/* _MIXERIOC(4) was deprecated */
/**
* Add mixer(s) from the buffer in (const char *)arg
*/
#define MIXERIOCLOADBUF _MIXERIOC(5)
/*
* XXX Thoughts for additional operations:
*
* - get/set output scale, for tuning center/limit values.
* - save/serialise for saving tuned mixers.
*/
#endif /* _DRV_ACCEL_H */
|
