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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/* $Id: hw_dsp.c,v 5.2 2002/05/04 09:36:27 lirc Exp $ */
/****************************************************************************
** hw_dsp.c ****************************************************************
****************************************************************************
*
* routines for diode in microphone input
*
* Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
* Copyright (C) 2001, 2002 Pavel Machek <pavel@ucw.cz>
*
* Distribute under GPL version 2 or later.
*
* This is hardware for "simplest ir receiver". Simplest ir receiver
* consists of BPW34 receiving diode connected to your microphone
* port. (Find a way where it generates loudest noise when you press
* transmit ir near it).
*
* BPW34 is not good selection (range is about meter, I can get better
* results with other diode), but at least its tested. If you know
* better hw to use, let me know.
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include "hardware.h"
#include "ir_remote.h"
#include "lircd.h"
#include "receive.h"
#include "transmit.h"
#include "hw_default.h"
extern struct ir_remote *repeat_remote;
/*
decoding stuff
*/
static int myfd = -1;
#define BUFSIZE 20
#define SAMPLE 47999
lirc_t dsp_readdata(lirc_t timeout)
{
lirc_t data;
static int lastlength, laststate;
int i;
signed short buf[BUFSIZE];
double energy = 0.0;
int state;
while(1) {
if (read(myfd, buf, BUFSIZE*2)!=BUFSIZE*2)
{
logperror(LOG_ERR,"could not read in simple...");
}
for (i=0; i<BUFSIZE-1; i++) {
energy += ((double) buf[i]-buf[i+1])*
((double) buf[i]-buf[i+1]);
}
energy /= BUFSIZE;
energy /= 2E4;
state = (energy > 2.0);
if (state == laststate) {
lastlength += ((1000000 / SAMPLE) * BUFSIZE);
} else {
data = lastlength | (laststate ? PULSE_BIT : 0);
lastlength = ((1000000 / SAMPLE) * BUFSIZE);
laststate = state;
LOGPRINTF(1,"Pulse came %8lx, %8d...",
data, data & ~PULSE_BIT);
return data;
}
timeout -= BUFSIZE*1000000 / SAMPLE;
if (timeout <= 0)
return 0;
}
return 0;
}
/*
interface functions
*/
int dsp_init()
{
int speed = SAMPLE, fmt = AFMT_S16_LE;
logprintf(LOG_INFO,"Initializing %s...",hw.device);
init_rec_buffer();
if((hw.fd=open(hw.device,O_RDONLY))<0)
{
logprintf(LOG_ERR,"could not open %s",hw.device);
logperror(LOG_ERR,"dsp_init()");
return(0);
}
if (ioctl(hw.fd, SNDCTL_DSP_SPEED, &speed)<0)
{
logprintf(LOG_ERR,"could not ioctl(SPEED) on %s",hw.device);
logperror(LOG_ERR,"dsp_init()");
return(0);
}
if (speed != SAMPLE)
{
logprintf(LOG_ERR,"wrong speed handshaked on %s",hw.device);
logperror(LOG_ERR,"dsp_init()");
return(0);
}
if (ioctl(hw.fd, SNDCTL_DSP_SETFMT, &fmt)<0)
{
logprintf(LOG_ERR,"could not ioctl(SETFMT) on %s",hw.device);
logperror(LOG_ERR,"dsp_init()");
return(0);
}
if (fmt != AFMT_S16_LE)
{
logprintf(LOG_ERR,"wrong format handshaked on %s",hw.device);
logperror(LOG_ERR,"dsp_init()");
return(0);
}
myfd = hw.fd;
/* select on soundcard does not work */
hw.fd = open("/dev/zero", O_RDONLY);
return(1);
}
int dsp_deinit(void)
{
close(hw.fd);
close(myfd);
return(1);
}
char *dsp_rec(struct ir_remote *remotes)
{
if(!clear_rec_buffer()) return(NULL);
return(decode_all(remotes));
}
int dsp_decode(struct ir_remote *remote,
ir_code *prep,ir_code *codep,ir_code *postp,
int *repeat_flagp,lirc_t *remaining_gapp)
{
return(receive_decode(remote,prep,codep,postp,
repeat_flagp,remaining_gapp));
}
struct hardware hw_dsp=
{
"/dev/dsp", /* simple device */
-1, /* fd */
LIRC_CAN_REC_MODE2, /* features */
0, /* send_mode */
LIRC_MODE_MODE2, /* rec_mode */
0, /* code_length */
dsp_init, /* init_func */
NULL, /* config_func */
dsp_deinit, /* deinit_func */
NULL, /* send_func */
dsp_rec, /* rec_func */
dsp_decode, /* decode_func */
dsp_readdata,
"dsp"
};
|
