2 * Copyright © 2009 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 * Basic I/O functions to support SDCC stdio package
24 #define AO_NUM_STDIOS 2
26 static __xdata struct ao_stdio stdios[AO_NUM_STDIOS];
27 static __data int8_t ao_cur_stdio;
28 static __data int8_t ao_num_stdios;
34 (*stdios[ao_cur_stdio].putchar)('\r');
35 (*stdios[ao_cur_stdio].putchar)(c);
41 if (stdios[ao_cur_stdio].flush)
42 stdios[ao_cur_stdio].flush();
45 __xdata uint8_t ao_stdin_ready;
48 getchar(void) __reentrant __critical
51 int8_t stdio = ao_cur_stdio;
54 c = stdios[stdio].pollchar();
55 if (c != AO_READ_AGAIN)
57 if (++stdio == ao_num_stdios)
59 if (stdio == ao_cur_stdio)
60 ao_sleep(&ao_stdin_ready);
67 ao_add_stdio(char (*pollchar)(void),
68 void (*putchar)(char),
71 if (ao_num_stdios == AO_NUM_STDIOS)
72 ao_panic(AO_PANIC_STDIO);
73 stdios[ao_num_stdios].pollchar = pollchar;
74 stdios[ao_num_stdios].putchar = putchar;
75 stdios[ao_num_stdios].flush = flush;