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[fnordlicht-mini] / firmware / fnordlicht-firmware / uart.h
1 /* vim:ts=4 sts=4 et tw=80
2 *
3 * fnordlicht firmware
4 *
5 * for additional information please
6 * see http://lochraster.org/fnordlichtmini
7 *
8 * (c) by Alexander Neumann <alexander@bumpern.de>
9 * Lars Noschinski <lars@public.noschinski.de>
10 *
11 * This program is free software: you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 3 as published by
13 * the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 * more details.
19 *
20 * You should have received a copy of the GNU General Public License along with
21 * this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #ifndef UART_H
25 #define UART_H
26
27 #include "globals.h"
28 #include "fifo.h"
29 #include "../common/io.h"
30
31 #if !CONFIG_SERIAL
32
33 #define uart_init(...)
34 #define uart_putc(...)
35
36 #else
37
38 /* structs */
39 struct global_uart_t {
40 fifo_t rx;
41 #if UART_TX_ENABLED
42 fifo_t tx;
43 #endif
44 };
45
46 /* global variables */
47 extern volatile struct global_uart_t global_uart;
48
49 /* prototypes */
50 void uart_init(void);
51 void uart_putc(uint8_t data);
52
53 #if UART_TX_ENABLED
54 static inline bool uart_send_complete(void)
55 {
56 return _BV(_UDRE_UART0) & _UCSRA_UART0;
57 }
58 #else
59 /* we're never incomplete, never. */
60 #define uart_send_complete() 1
61 #endif
62
63 #endif
64
65 #endif
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