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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
static char
ao_packet_getchar(void) __critical
{
char c;
while ((c = ao_packet_pollchar()) == AO_READ_AGAIN) {
if (!ao_packet_enable)
break;
if (ao_packet_master_sleeping)
ao_wakeup(&ao_packet_master_sleeping);
flush();
ao_sleep(&ao_stdin_ready);
}
return c;
}
static void
ao_packet_echo(void) __reentrant
{
char c;
while (ao_packet_enable) {
c = ao_packet_getchar();
if (c != AO_READ_AGAIN)
putchar(c);
}
ao_exit();
}
static __xdata struct ao_task ao_packet_echo_task;
static __xdata uint16_t ao_packet_master_delay;
static __xdata uint16_t ao_packet_master_time;
#define AO_PACKET_MASTER_DELAY_SHORT AO_MS_TO_TICKS(100)
#define AO_PACKET_MASTER_DELAY_LONG AO_MS_TO_TICKS(1000)
#define AO_PACKET_MASTER_DELAY_TIMEOUT AO_MS_TO_TICKS(2000)
static void
ao_packet_master_busy(void)
{
ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
ao_packet_master_time = ao_time();
}
static void
ao_packet_master_check_busy(void)
{
int16_t idle;
if (ao_packet_master_delay != AO_PACKET_MASTER_DELAY_SHORT)
return;
idle = (int16_t) (ao_time() - ao_packet_master_time);
if (idle > AO_PACKET_MASTER_DELAY_TIMEOUT)
ao_packet_master_delay = AO_PACKET_MASTER_DELAY_LONG;
}
void
ao_packet_master(void)
{
ao_config_get();
ao_tx_packet.addr = ao_serial_number;
ao_tx_packet.len = AO_PACKET_SYN;
ao_packet_master_time = ao_time();
ao_packet_master_delay = AO_PACKET_MASTER_DELAY_SHORT;
while (ao_packet_enable) {
uint8_t r;
memcpy(ao_tx_packet.callsign, ao_config.callsign, AO_MAX_CALLSIGN);
ao_packet_send();
if (ao_tx_packet.len)
ao_packet_master_busy();
ao_packet_master_check_busy();
ao_alarm(ao_packet_master_delay);
r = ao_packet_recv();
ao_clear_alarm();
if (r) {
/* if we can transmit data, do so */
if (ao_packet_tx_used && ao_tx_packet.len == 0)
continue;
if (ao_rx_packet.packet.len)
ao_packet_master_busy();
ao_packet_master_sleeping = 1;
ao_alarm(ao_packet_master_delay);
ao_sleep(&ao_packet_master_sleeping);
ao_clear_alarm();
ao_packet_master_sleeping = 0;
}
}
ao_exit();
}
static void
ao_packet_forward(void) __reentrant
{
char c;
ao_packet_enable = 1;
ao_cmd_white();
flush();
#if HAS_MONITOR
ao_set_monitor(0);
#endif
ao_add_task(&ao_packet_task, ao_packet_master, "master");
ao_add_task(&ao_packet_echo_task, ao_packet_echo, "echo");
while ((c = getchar()) != '~') {
if (c == '\r') c = '\n';
ao_packet_putchar(c);
}
/* Wait for a second if there is any pending data */
for (c = 0; (ao_packet_tx_used || ao_tx_packet.len) && c < 10; c++)
ao_delay(AO_MS_TO_TICKS(100));
ao_packet_enable = 0;
while (ao_packet_echo_task.wchan || ao_packet_task.wchan) {
ao_radio_recv_abort();
ao_wakeup(&ao_stdin_ready);
ao_delay(AO_MS_TO_TICKS(10));
}
}
__code struct ao_cmds ao_packet_master_cmds[] = {
{ ao_packet_forward, "p\0Remote packet link." },
{ 0, NULL },
};
void
ao_packet_master_init(void)
{
ao_cmd_register(&ao_packet_master_cmds[0]);
}
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