Add LED support to x68k
[tmk_keyboard.git] / protocol / x68k.c
CommitLineData
38d61ee1 1/*
2Copyright 2012 Jun WAKO <wakojun@gmail.com>
3
4This software is licensed with a Modified BSD License.
5All of this is supposed to be Free Software, Open Source, DFSG-free,
6GPL-compatible, and OK to use in both free and proprietary applications.
7Additions and corrections to this file are welcome.
8
9
10Redistribution and use in source and binary forms, with or without
11modification, 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
25THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35POSSIBILITY OF SUCH DAMAGE.
36*/
37
38#include <stdbool.h>
39#include <avr/io.h>
40#include <avr/interrupt.h>
41#include "x68k.h"
42
43
44void x68k_init(void)
45{
46 KBD_RX_INIT();
47}
48
49// RX ring buffer
50#define RBUF_SIZE 8
51static uint8_t rbuf[RBUF_SIZE];
52static uint8_t rbuf_head = 0;
53static uint8_t rbuf_tail = 0;
54
55uint8_t x68k_recv(void)
56{
57 uint8_t data = 0;
58 if (rbuf_head == rbuf_tail) {
59 return 0;
60 }
61
62 data = rbuf[rbuf_tail];
63 rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
64 return data;
65}
66
42c96241 67void x68k_send(uint8_t d)
68{
69 while (!(UCSR1A&(1<<UDRE1)));
70 UDR1 = d;
71}
72
38d61ee1 73// USART RX complete interrupt
74ISR(KBD_RX_VECT)
75{
76 uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
77 if (next != rbuf_tail) {
78 rbuf[rbuf_head] = KBD_RX_DATA;
79 rbuf_head = next;
80 }
81}
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