git.gag.com Git - fw/altos/blob - src/drivers/ao_packet_master.c

   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 static char
  21 ao_packet_getchar(void)
  22 {
  23         int c;
  24
  25         /* No need to block interrupts in this function as
  26          * all packet variables are only modified from task
  27          * context, not an interrupt handler
  28          */
  29         while ((c = _ao_packet_pollchar()) == AO_READ_AGAIN) {
  30                 if (!ao_packet_enable)
  31                         break;
  32                 if (ao_packet_master_sleeping)
  33                         ao_wakeup(&ao_packet_master_sleeping);
  34                 flush();
  35                 ao_sleep(&ao_stdin_ready);
  36         }
  37         return c;
  38 }
  39
  40 static void
  41 ao_packet_echo(void) __reentrant
  42 {
  43         int     c;
  44         while (ao_packet_enable) {
  45                 c = ao_packet_getchar();
  46                 if (c != AO_READ_AGAIN)
  47                         putchar(c);
  48         }
  49         ao_exit();
  50 }
  51
  52 static __xdata struct ao_task   ao_packet_echo_task;
  53 static __xdata uint16_t         ao_packet_master_delay;
  54 static __xdata uint16_t         ao_packet_master_time;
  55
  56 #define AO_PACKET_MASTER_DELAY_SHORT    AO_MS_TO_TICKS(100)
  57 #define AO_PACKET_MASTER_DELAY_LONG     AO_MS_TO_TICKS(1000)
  58 #define AO_PACKET_MASTER_DELAY_TIMEOUT  AO_MS_TO_TICKS(2000)
  59
  60 static void
  61 ao_packet_master_busy(void)
  62 {
  63         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  64         ao_packet_master_time = ao_time();
  65 }
  66
  67 static void
  68 ao_packet_master_check_busy(void)
  69 {
  70         int16_t idle;
  71         if (ao_packet_master_delay != AO_PACKET_MASTER_DELAY_SHORT)
  72                 return;
  73         idle = (int16_t) (ao_time() - ao_packet_master_time);
  74
  75         if (idle > AO_PACKET_MASTER_DELAY_TIMEOUT)
  76                 ao_packet_master_delay = AO_PACKET_MASTER_DELAY_LONG;
  77 }
  78
  79 void
  80 ao_packet_master(void)
  81 {
  82         ao_config_get();
  83         ao_tx_packet.addr = ao_serial_number;
  84         ao_tx_packet.len = AO_PACKET_SYN;
  85         ao_packet_master_time = ao_time();
  86         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  87         while (ao_packet_enable) {
  88                 uint8_t r;
  89                 ao_xmemcpy(ao_tx_packet.callsign, ao_config.callsign, AO_MAX_CALLSIGN);
  90                 ao_packet_send();
  91                 if (ao_tx_packet.len)
  92                         ao_packet_master_busy();
  93                 ao_packet_master_check_busy();
  94                 ao_alarm(ao_packet_master_delay);
  95                 r = ao_packet_recv();
  96                 ao_clear_alarm();
  97                 if (r) {
  98                         /* if we can transmit data, do so */
  99                         if (ao_packet_tx_used && ao_tx_packet.len == 0)
 100                                 continue;
 101                         if (ao_rx_packet.packet.len)
 102                                 ao_packet_master_busy();
 103                         ao_packet_master_sleeping = 1;
 104                         ao_alarm(ao_packet_master_delay);
 105                         ao_sleep(&ao_packet_master_sleeping);
 106                         ao_clear_alarm();
 107                         ao_packet_master_sleeping = 0;
 108                 }
 109         }
 110         ao_exit();
 111 }
 112
 113 static void
 114 ao_packet_forward(void) __reentrant
 115 {
 116         char c;
 117         ao_packet_enable = 1;
 118         ao_cmd_white();
 119
 120         flush();
 121 #if HAS_MONITOR
 122         ao_monitor_disable();
 123 #endif
 124         ao_add_task(&ao_packet_task, ao_packet_master, "master");
 125         ao_add_task(&ao_packet_echo_task, ao_packet_echo, "echo");
 126         while ((c = getchar()) != '~') {
 127                 if (c == '\r') c = '\n';
 128                 ao_packet_putchar(c);
 129         }
 130
 131         /* Wait for a second if there is any pending data */
 132         for (c = 0; (ao_packet_tx_used || ao_tx_packet.len) && c < 10; c++)
 133                 ao_delay(AO_MS_TO_TICKS(100));
 134         ao_packet_enable = 0;
 135         while (ao_packet_echo_task.wchan || ao_packet_task.wchan) {
 136                 ao_radio_recv_abort();
 137                 ao_wakeup(&ao_stdin_ready);
 138                 ao_delay(AO_MS_TO_TICKS(10));
 139         }
 140 #if HAS_MONITOR
 141         ao_monitor_enable();
 142 #endif
 143 }
 144
 145 static void
 146 ao_packet_signal(void)
 147 {
 148         printf ("RSSI: %d\n", ao_radio_rssi);
 149 }
 150
 151 __code struct ao_cmds ao_packet_master_cmds[] = {
 152         { ao_packet_forward,    "p\0Remote packet link." },
 153         { ao_packet_signal,     "s\0Report signal strength." },
 154         { 0,    NULL },
 155 };
 156
 157 void
 158 ao_packet_master_init(void)
 159 {
 160         ao_cmd_register(&ao_packet_master_cmds[0]);
 161 }