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; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include "ao.h"
  20
  21 static int
  22 ao_packet_getchar(void)
  23 {
  24         int c;
  25
  26         /* No need to block interrupts in this function as
  27          * all packet variables are only modified from task
  28          * context, not an interrupt handler
  29          */
  30         while ((c = _ao_packet_pollchar()) == AO_READ_AGAIN) {
  31                 if (!ao_packet_enable)
  32                         break;
  33                 if (ao_packet_master_sleeping)
  34                         ao_wakeup(&ao_packet_master_sleeping);
  35                 flush();
  36                 ao_sleep(&ao_stdin_ready);
  37         }
  38         return c;
  39 }
  40
  41 static void
  42 ao_packet_echo(void)
  43 {
  44         int     c;
  45         while (ao_packet_enable) {
  46                 c = ao_packet_getchar();
  47                 if (c != AO_READ_AGAIN)
  48                         putchar(c);
  49         }
  50         ao_exit();
  51 }
  52
  53 static struct ao_task   ao_packet_echo_task;
  54 static uint16_t         ao_packet_master_delay;
  55 static uint16_t         ao_packet_master_time;
  56
  57 #define AO_PACKET_MASTER_DELAY_SHORT    AO_MS_TO_TICKS(100)
  58 #define AO_PACKET_MASTER_DELAY_LONG     AO_MS_TO_TICKS(1000)
  59 #define AO_PACKET_MASTER_DELAY_TIMEOUT  AO_MS_TO_TICKS(2000)
  60
  61 #if HAS_RADIO_RATE
  62 #define AO_PACKET_MASTER_RECV_DELAY     AO_MS_TO_TICKS(100) << (ao_config.radio_rate << 1)
  63 #else
  64 #define AO_PACKET_MASTER_RECV_DELAY     AO_MS_TO_TICKS(100)
  65 #endif
  66
  67 static void
  68 ao_packet_master_busy(void)
  69 {
  70         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  71         ao_packet_master_time = ao_time();
  72 }
  73
  74 static void
  75 ao_packet_master_check_busy(void)
  76 {
  77         int16_t idle;
  78         if (ao_packet_master_delay != AO_PACKET_MASTER_DELAY_SHORT)
  79                 return;
  80         idle = (int16_t) (ao_time() - ao_packet_master_time);
  81
  82         if (idle > AO_PACKET_MASTER_DELAY_TIMEOUT)
  83                 ao_packet_master_delay = AO_PACKET_MASTER_DELAY_LONG;
  84 }
  85
  86 void
  87 ao_packet_master(void)
  88 {
  89         ao_config_get();
  90         ao_tx_packet.addr = ao_serial_number;
  91         ao_tx_packet.len = AO_PACKET_SYN;
  92         ao_packet_master_time = ao_time();
  93         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  94         while (ao_packet_enable) {
  95                 uint8_t r;
  96                 ao_xmemcpy(ao_tx_packet.callsign, ao_config.callsign, AO_MAX_CALLSIGN);
  97                 ao_packet_send();
  98                 if (ao_tx_packet.len)
  99                         ao_packet_master_busy();
 100                 ao_packet_master_check_busy();
 101                 r = ao_packet_recv(AO_PACKET_MASTER_RECV_DELAY);
 102                 if (r) {
 103                         /* if we can transmit data, do so */
 104                         if (ao_packet_tx_used && ao_tx_packet.len == 0)
 105                                 continue;
 106                         if (ao_rx_packet.packet.len)
 107                                 ao_packet_master_busy();
 108                         ao_packet_master_sleeping = 1;
 109                         ao_sleep_for(&ao_packet_master_sleeping, ao_packet_master_delay);
 110                         ao_packet_master_sleeping = 0;
 111                 }
 112         }
 113         ao_exit();
 114 }
 115
 116 static void
 117 ao_packet_forward(void)
 118 {
 119         char c;
 120         ao_packet_enable = 1;
 121         ao_packet_tx_used = 0;
 122         ao_cmd_white();
 123
 124         flush();
 125 #if HAS_MONITOR
 126         ao_monitor_disable();
 127 #endif
 128         ao_add_task(&ao_packet_task, ao_packet_master, "master");
 129         ao_add_task(&ao_packet_echo_task, ao_packet_echo, "echo");
 130         while ((c = getchar()) != '~') {
 131                 if (c == '\r') c = '\n';
 132                 ao_packet_putchar(c);
 133         }
 134
 135         /* Wait for a second if there is any pending data */
 136         for (c = 0; (ao_packet_tx_used || ao_tx_packet.len) && c < 10; c++)
 137                 ao_delay(AO_MS_TO_TICKS(100));
 138         ao_packet_enable = 0;
 139         while (ao_packet_echo_task.wchan || ao_packet_task.wchan) {
 140                 ao_radio_recv_abort();
 141                 ao_wakeup(&ao_stdin_ready);
 142                 ao_delay(AO_MS_TO_TICKS(10));
 143         }
 144 #if HAS_MONITOR
 145         ao_monitor_enable();
 146 #endif
 147 }
 148
 149 static void
 150 ao_packet_signal(void)
 151 {
 152         printf ("RSSI: %d\n", ao_radio_rssi);
 153 }
 154
 155 const struct ao_cmds ao_packet_master_cmds[] = {
 156         { ao_packet_forward,    "p\0Remote packet link." },
 157         { ao_packet_signal,     "s\0Report signal strength." },
 158         { 0,    NULL },
 159 };
 160
 161 void
 162 ao_packet_master_init(void)
 163 {
 164         ao_cmd_register(&ao_packet_master_cmds[0]);
 165 }