git.zerfleddert.de Git - fnordlicht-mini/blob - 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