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   1 /*
   2  * Copyright © 2009 Keith Packard <keithp@keithp.com>
   3  *
   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.
   7  *
   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.
  12  *
  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.
  16  */
  17
  18 #include "ao.h"
  19
  20 /*
  21  * Basic I/O functions to support SDCC stdio package
  22  */
  23
  24 #ifndef USE_SERIAL_0_STDIN
  25 #define USE_SERIAL_0_STDIN      0
  26 #endif
  27 #ifndef USE_SERIAL_1_STDIN
  28 #define USE_SERIAL_1_STDIN      0
  29 #endif
  30 #ifndef USE_SERIAL_2_STDIN
  31 #define USE_SERIAL_2_STDIN      0
  32 #endif
  33 #ifndef USE_SERIAL_3_STDIN
  34 #define USE_SERIAL_3_STDIN      0
  35 #endif
  36 #ifndef USE_SERIAL_4_STDIN
  37 #define USE_SERIAL_4_STDIN      0
  38 #endif
  39 #ifndef USE_SERIAL_5_STDIN
  40 #define USE_SERIAL_5_STDIN      0
  41 #endif
  42 #ifndef USE_SERIAL_6_STDIN
  43 #define USE_SERIAL_6_STDIN      0
  44 #endif
  45 #ifndef USE_SERIAL_7_STDIN
  46 #define USE_SERIAL_7_STDIN      0
  47 #endif
  48 #ifndef USE_SERIAL_8_STDIN
  49 #define USE_SERIAL_8_STDIN      0
  50 #endif
  51 #ifndef USE_SERIAL_9_STDIN
  52 #define USE_SERIAL_9_STDIN      0
  53 #endif
  54
  55 #define USE_SERIAL_STDIN (USE_SERIAL_0_STDIN +  \
  56                           USE_SERIAL_1_STDIN +  \
  57                           USE_SERIAL_2_STDIN +  \
  58                           USE_SERIAL_3_STDIN +  \
  59                           USE_SERIAL_4_STDIN +  \
  60                           USE_SERIAL_5_STDIN +  \
  61                           USE_SERIAL_6_STDIN +  \
  62                           USE_SERIAL_7_STDIN +  \
  63                           USE_SERIAL_8_STDIN +  \
  64                           USE_SERIAL_9_STDIN)
  65
  66 #define AO_NUM_STDIOS   (HAS_USB + PACKET_HAS_SLAVE + USE_SERIAL_STDIN)
  67
  68 __xdata struct ao_stdio ao_stdios[AO_NUM_STDIOS];
  69 __pdata int8_t ao_cur_stdio;
  70 __pdata int8_t ao_num_stdios;
  71
  72 void
  73 putchar(char c)
  74 {
  75 #if LOW_LEVEL_DEBUG
  76         if (!ao_cur_task) {
  77                 extern void ao_debug_out(char c);
  78                 if (c == '\n')
  79                         ao_debug_out('\r');
  80                 ao_debug_out(c);
  81                 return;
  82         }
  83 #endif
  84         if (c == '\n')
  85                 (*ao_stdios[ao_cur_stdio].putchar)('\r');
  86         (*ao_stdios[ao_cur_stdio].putchar)(c);
  87 }
  88
  89 void
  90 flush(void)
  91 {
  92         if (ao_stdios[ao_cur_stdio].flush)
  93                 ao_stdios[ao_cur_stdio].flush();
  94 }
  95
  96 __xdata uint8_t ao_stdin_ready;
  97
  98 char
  99 getchar(void) __reentrant
 100 {
 101         int c;
 102         ao_arch_critical(
 103                 int8_t stdio = ao_cur_stdio;
 104
 105                 for (;;) {
 106                         c = ao_stdios[stdio].pollchar();
 107                         if (c != AO_READ_AGAIN)
 108                                 break;
 109                         if (++stdio == ao_num_stdios)
 110                                 stdio = 0;
 111                         if (stdio == ao_cur_stdio)
 112                                 ao_sleep(&ao_stdin_ready);
 113                 }
 114                 ao_cur_stdio = stdio;
 115                 );
 116         return c;
 117 }
 118
 119 uint8_t
 120 ao_echo(void)
 121 {
 122         return ao_stdios[ao_cur_stdio].echo;
 123 }
 124
 125 int8_t
 126 ao_add_stdio(int (*pollchar)(void),
 127              void (*putchar)(char),
 128              void (*flush)(void)) __reentrant
 129 {
 130         if (ao_num_stdios == AO_NUM_STDIOS)
 131                 ao_panic(AO_PANIC_STDIO);
 132         ao_stdios[ao_num_stdios].pollchar = pollchar;
 133         ao_stdios[ao_num_stdios].putchar = putchar;
 134         ao_stdios[ao_num_stdios].flush = flush;
 135         ao_stdios[ao_num_stdios].echo = 1;
 136         return ao_num_stdios++;
 137 }