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