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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 static char
  21 ao_packet_getchar(void) __critical
  22 {
  23         char c;
  24         while ((c = ao_packet_pollchar()) == AO_READ_AGAIN)
  25         {
  26                 if (!ao_packet_enable)
  27                         break;
  28                 if (ao_packet_master_sleeping)
  29                         ao_wake_task(&ao_packet_task);
  30                 ao_usb_flush();
  31                 ao_sleep(&ao_stdin_ready);
  32                 if (!ao_packet_enable)
  33                         break;
  34         }
  35         return c;
  36 }
  37
  38 static void
  39 ao_packet_echo(void) __reentrant
  40 {
  41         uint8_t c;
  42         while (ao_packet_enable) {
  43                 c = ao_packet_getchar();
  44                 if (ao_packet_enable)
  45                         ao_usb_putchar(c);
  46         }
  47         ao_exit();
  48 }
  49
  50 static __xdata struct ao_task   ao_packet_echo_task;
  51 static __xdata uint16_t         ao_packet_master_delay;
  52 static __xdata uint16_t         ao_packet_master_time;
  53
  54 #define AO_PACKET_MASTER_DELAY_SHORT    AO_MS_TO_TICKS(100)
  55 #define AO_PACKET_MASTER_DELAY_LONG     AO_MS_TO_TICKS(1000)
  56 #define AO_PACKET_MASTER_DELAY_TIMEOUT  AO_MS_TO_TICKS(2000)
  57
  58 static void
  59 ao_packet_master_busy(void)
  60 {
  61         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  62         ao_packet_master_time = ao_time();
  63 }
  64
  65 static void
  66 ao_packet_master_check_busy(void)
  67 {
  68         int16_t idle;
  69         if (ao_packet_master_delay != AO_PACKET_MASTER_DELAY_SHORT)
  70                 return;
  71         idle = (int16_t) (ao_time() - ao_packet_master_time);
  72
  73         if (idle > AO_PACKET_MASTER_DELAY_TIMEOUT)
  74                 ao_packet_master_delay = AO_PACKET_MASTER_DELAY_LONG;
  75 }
  76
  77 void
  78 ao_packet_master(void)
  79 {
  80         uint8_t status;
  81
  82         ao_config_get();
  83         ao_radio_set_packet();
  84         ao_tx_packet.addr = ao_serial_number;
  85         ao_tx_packet.len = AO_PACKET_SYN;
  86         ao_packet_master_time = ao_time();
  87         ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
  88         while (ao_packet_enable) {
  89                 memcpy(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                 status = ao_packet_recv();
  96                 if (status & AO_DMA_DONE) {
  97                         /* if we can transmit data, do so */
  98                         if (ao_packet_tx_used && ao_tx_packet.len == 0)
  99                                 continue;
 100                         if (ao_rx_packet.packet.len)
 101                                 ao_packet_master_busy();
 102                         ao_packet_master_sleeping = 1;
 103                         ao_delay(ao_packet_master_delay);
 104                         ao_packet_master_sleeping = 0;
 105                 }
 106         }
 107         ao_radio_set_telemetry();
 108         ao_exit();
 109 }
 110
 111 static void
 112 ao_packet_forward(void) __reentrant
 113 {
 114         char c;
 115         ao_packet_enable = 1;
 116         ao_cmd_white();
 117
 118         flush();
 119         ao_set_monitor(0);
 120         ao_add_task(&ao_packet_task, ao_packet_master, "master");
 121         ao_add_task(&ao_packet_echo_task, ao_packet_echo, "echo");
 122         while ((c = ao_usb_getchar()) != '~') {
 123                 if (c == '\r') c = '\n';
 124                 ao_packet_putchar(c);
 125         }
 126
 127         /* Wait for a second if there is any pending data */
 128         for (c = 0; (ao_packet_tx_used || ao_tx_packet.len) && c < 10; c++)
 129                 ao_delay(AO_MS_TO_TICKS(100));
 130         ao_packet_enable = 0;
 131         while (ao_packet_echo_task.wchan || ao_packet_task.wchan) {
 132                 if (ao_packet_echo_task.wchan)
 133                         ao_wake_task(&ao_packet_echo_task);
 134                 ao_delay(AO_MS_TO_TICKS(10));
 135         }
 136 }
 137
 138
 139
 140 __code struct ao_cmds ao_packet_master_cmds[] = {
 141         { 'p',  ao_packet_forward,      "p                                  Remote packet link." },
 142         { 0,    ao_packet_forward,      NULL },
 143 };
 144
 145 void
 146 ao_packet_master_init(void)
 147 {
 148         ao_cmd_register(&ao_packet_master_cmds[0]);
 149 }