Codes appear to be detected correctly, the break codes are broken.
[tmk_keyboard.git] / tmk_core / protocol / xt_interrupt.c
1 /*
2 Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
3
4 This software is licensed with a Modified BSD License.
5 All of this is supposed to be Free Software, Open Source, DFSG-free,
6 GPL-compatible, and OK to use in both free and proprietary applications.
7 Additions and corrections to this file are welcome.
8
9
10 Redistribution and use in source and binary forms, with or without
11 modification, are permitted provided that the following conditions are met:
12
13 * Redistributions of source code must retain the above copyright
14 notice, this list of conditions and the following disclaimer.
15
16 * Redistributions in binary form must reproduce the above copyright
17 notice, this list of conditions and the following disclaimer in
18 the documentation and/or other materials provided with the
19 distribution.
20
21 * Neither the name of the copyright holders nor the names of
22 contributors may be used to endorse or promote products derived
23 from this software without specific prior written permission.
24
25 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * PS/2 protocol Pin interrupt version
40 */
41
42 #include <stdbool.h>
43 #include <avr/interrupt.h>
44 #include <util/delay.h>
45 #include "pbuff.h"
46 #include "xt.h"
47 #include "xt_io.h"
48 #include "wait.h"
49 #include "print.h"
50
51 void xt_host_init(void)
52 {
53 XT_INT_INIT();
54 XT_INT_ON();
55 }
56
57 /* get data received by interrupt */
58 uint8_t xt_host_recv(void)
59 {
60 if (pbuf_has_data()) {
61 return pbuf_dequeue();
62 } else {
63 return 0;
64 }
65 }
66
67 ISR(XT_INT_VECT)
68 {
69 static enum {
70 INIT,
71 BIT0, BIT1, BIT2, BIT3, BIT4, BIT5, BIT6, BIT7,
72 STOP,
73 } state = INIT;
74 static uint8_t data = 0;
75 // wait for clock falling edge
76 if(state != INIT)
77 wait_clock_lo(70);
78
79 switch (state) {
80 case INIT:
81 if (data_in())
82 state++;
83 break;
84 case BIT0:
85 case BIT1:
86 case BIT2:
87 case BIT3:
88 case BIT4:
89 case BIT5:
90 case BIT6:
91 case BIT7:
92 state++;
93 data >>= 1;
94 if (data_in()) {
95 data |= 0x80;
96 }
97 break;
98 case STOP:
99 if (!data_in())
100 goto DONE;
101 pbuf_enqueue(data);
102 goto DONE;
103 break;
104 default:
105 goto DONE;
106 }
107 goto RETURN;
108 DONE:
109 state = INIT;
110 data = 0;
111 RETURN:
112 return;
113 }
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