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 #if HAS_RADIO_RATE
  61 #define AO_PACKET_MASTER_RECV_DELAY     AO_MS_TO_TICKS(100) << (ao_config.radio_rate << 1)
  62 #else
  63 #define AO_PACKET_MASTER_RECV_DELAY     AO_MS_TO_TICKS(100)
  64 #endif
  65
  66 static void
  67 ao_packet_master_busy(void)
  68 {
  69         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  70         ao_packet_master_time = ao_time();
  71 }
  72
  73 static void
  74 ao_packet_master_check_busy(void)
  75 {
  76         int16_t idle;
  77         if (ao_packet_master_delay != AO_PACKET_MASTER_DELAY_SHORT)
  78                 return;
  79         idle = (int16_t) (ao_time() - ao_packet_master_time);
  80
  81         if (idle > AO_PACKET_MASTER_DELAY_TIMEOUT)
  82                 ao_packet_master_delay = AO_PACKET_MASTER_DELAY_LONG;
  83 }
  84
  85 void
  86 ao_packet_master(void)
  87 {
  88         ao_config_get();
  89         ao_tx_packet.addr = ao_serial_number;
  90         ao_tx_packet.len = AO_PACKET_SYN;
  91         ao_packet_master_time = ao_time();
  92         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  93         while (ao_packet_enable) {
  94                 uint8_t r;
  95                 ao_xmemcpy(ao_tx_packet.callsign, ao_config.callsign, AO_MAX_CALLSIGN);
  96                 ao_packet_send();
  97                 if (ao_tx_packet.len)
  98                         ao_packet_master_busy();
  99                 ao_packet_master_check_busy();
 100                 ao_alarm(AO_PACKET_MASTER_RECV_DELAY);
 101                 r = ao_packet_recv();
 102                 ao_clear_alarm();
 103                 if (r) {
 104                         /* if we can transmit data, do so */
 105                         if (ao_packet_tx_used && ao_tx_packet.len == 0)
 106                                 continue;
 107                         if (ao_rx_packet.packet.len)
 108                                 ao_packet_master_busy();
 109                         ao_packet_master_sleeping = 1;
 110                         ao_alarm(ao_packet_master_delay);
 111                         ao_sleep(&ao_packet_master_sleeping);
 112                         ao_clear_alarm();
 113                         ao_packet_master_sleeping = 0;
 114                 }
 115         }
 116         ao_exit();
 117 }
 118
 119 static void
 120 ao_packet_forward(void) __reentrant
 121 {
 122         char c;
 123         ao_packet_enable = 1;
 124         ao_cmd_white();
 125
 126         flush();
 127 #if HAS_MONITOR
 128         ao_monitor_disable();
 129 #endif
 130         ao_add_task(&ao_packet_task, ao_packet_master, "master");
 131         ao_add_task(&ao_packet_echo_task, ao_packet_echo, "echo");
 132         while ((c = getchar()) != '~') {
 133                 if (c == '\r') c = '\n';
 134                 ao_packet_putchar(c);
 135         }
 136
 137         /* Wait for a second if there is any pending data */
 138         for (c = 0; (ao_packet_tx_used || ao_tx_packet.len) && c < 10; c++)
 139                 ao_delay(AO_MS_TO_TICKS(100));
 140         ao_packet_enable = 0;
 141         while (ao_packet_echo_task.wchan || ao_packet_task.wchan) {
 142                 ao_radio_recv_abort();
 143                 ao_wakeup(&ao_stdin_ready);
 144                 ao_delay(AO_MS_TO_TICKS(10));
 145         }
 146 #if HAS_MONITOR
 147         ao_monitor_enable();
 148 #endif
 149 }
 150
 151 static void
 152 ao_packet_signal(void)
 153 {
 154         printf ("RSSI: %d\n", ao_radio_rssi);
 155 }
 156
 157 __code struct ao_cmds ao_packet_master_cmds[] = {
 158         { ao_packet_forward,    "p\0Remote packet link." },
 159         { ao_packet_signal,     "s\0Report signal strength." },
 160         { 0,    NULL },
 161 };
 162
 163 void
 164 ao_packet_master_init(void)
 165 {
 166         ao_cmd_register(&ao_packet_master_cmds[0]);
 167 }