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ec1bef8e | 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 <stdbool.h> | |
28 | ||
29 | ||
30 | /* define uart mode (8N1) */ | |
31 | #if defined(__AVR_ATmega8__) | |
32 | /* in atmega8, we need a special switching bit | |
33 | * for addressing UCSRC */ | |
34 | #define UART_UCSRC _BV(URSEL) | _BV(UCSZ0) | _BV(UCSZ1) | |
35 | ||
36 | #elif defined(__AVR_ATmega88__) || defined(__AVR_ATmega168__) | |
37 | /* in atmega88, this isn't needed any more */ | |
38 | #define UART_UCSRC _BV(_UCSZ0_UART0) | _BV(_UCSZ1_UART0) | |
39 | #endif | |
40 | ||
41 | ||
42 | static inline void uart_init(void) | |
43 | { | |
44 | #define BAUD CONFIG_SERIAL_BAUDRATE | |
45 | #include <util/setbaud.h> | |
46 | /* set baud rate */ | |
47 | _UBRRH_UART0 = UBRRH_VALUE; | |
48 | _UBRRL_UART0 = UBRRL_VALUE; | |
49 | ||
50 | #if USE_2X | |
51 | _UCSRA_UART0 |= (1 << _U2X_UART0); | |
52 | #endif | |
53 | ||
54 | /* set mode */ | |
55 | _UCSRC_UART0 = UART_UCSRC; | |
56 | ||
57 | /* enable transmitter and receiver */ | |
58 | _UCSRB_UART0 = _BV(_TXEN_UART0) | _BV(_RXEN_UART0); | |
59 | } | |
60 | ||
61 | static inline bool uart_receive_complete(void) | |
62 | { | |
63 | return _UCSRA_UART0 & _BV(_RXC_UART0); | |
64 | } | |
65 | ||
66 | static inline bool uart_send_complete(void) | |
67 | { | |
68 | return _BV(_UDRE_UART0) & _UCSRA_UART0; | |
69 | } | |
70 | ||
71 | static inline uint8_t uart_getc(void) | |
72 | { | |
73 | return _UDR_UART0; | |
74 | } | |
75 | ||
76 | static void uart_putc(uint8_t data) | |
77 | { | |
78 | while(!(_BV(_UDRE_UART0) & _UCSRA_UART0)); | |
79 | UDR0 = data; | |
80 | } | |
81 | ||
82 | #endif |