2 * Copyright © 2009 Keith Packard <keithp@keithp.com>
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.
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.
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.
21 struct ao_packet_recv ao_rx_packet;
22 struct ao_packet ao_tx_packet;
23 uint8_t ao_packet_rx_len, ao_packet_rx_used, ao_packet_tx_used;
25 static uint8_t tx_data[AO_PACKET_MAX];
26 static uint8_t rx_data[AO_PACKET_MAX];
27 static uint8_t rx_seq;
29 struct ao_task ao_packet_task;
30 uint8_t ao_packet_enable;
31 uint8_t ao_packet_restart;
34 uint8_t ao_packet_master_sleeping;
41 ao_led_on(AO_LED_RED);
43 /* If any tx data is pending then copy it into the tx packet */
44 if (ao_packet_tx_used && ao_tx_packet.len == 0) {
45 ao_xmemcpy(&ao_tx_packet.d, tx_data, ao_packet_tx_used);
46 ao_tx_packet.len = ao_packet_tx_used;
48 ao_packet_tx_used = 0;
51 ao_radio_send(&ao_tx_packet, sizeof (ao_tx_packet));
53 ao_led_off(AO_LED_RED);
58 ao_packet_recv(uint16_t timeout)
63 ao_led_on(AO_LED_GREEN);
65 dma_done = ao_radio_recv(&ao_rx_packet, sizeof (struct ao_packet_recv), timeout);
67 ao_led_off(AO_LED_GREEN);
71 extern uint32_t ao_rx_start_tick, ao_rx_packet_tick, ao_rx_done_tick, ao_rx_last_done_tick;
72 extern uint32_t ao_fec_decode_start, ao_fec_decode_end;
74 printf ("between packet: %d\n", ao_rx_start_tick - ao_rx_last_done_tick);
75 printf ("receive start delay: %d\n", ao_rx_packet_tick - ao_rx_start_tick);
76 printf ("decode time: %d\n", ao_fec_decode_end - ao_fec_decode_start);
77 printf ("rx cleanup: %d\n\n", ao_rx_done_tick - ao_fec_decode_end);
82 /* Check to see if we got a valid packet */
85 if (!(ao_rx_packet.status & AO_RADIO_STATUS_CRC_OK))
88 /* Accept packets with matching call signs, or any packet if
89 * our callsign hasn't been configured
91 if (ao_xmemcmp(ao_rx_packet.packet.callsign,
93 AO_MAX_CALLSIGN) != 0 &&
94 ao_xmemcmp(ao_config.callsign, "N0CALL", 7) != 0)
97 /* SYN packets carry no data */
98 if (ao_rx_packet.packet.len == AO_PACKET_SYN) {
99 rx_seq = ao_rx_packet.packet.seq;
100 ao_tx_packet.seq = ao_rx_packet.packet.ack;
101 ao_tx_packet.ack = rx_seq;
102 } else if (ao_rx_packet.packet.len) {
104 /* Check for incoming data at the next sequence and
105 * for an empty data buffer
107 if ((ao_rx_packet.packet.seq == (uint8_t) (rx_seq + (uint8_t) 1) ||
108 ao_packet_restart) &&
109 ao_packet_rx_used == ao_packet_rx_len) {
111 /* Copy data to the receive data buffer and set up the
114 ao_xmemcpy(rx_data, ao_rx_packet.packet.d, ao_rx_packet.packet.len);
115 ao_packet_rx_used = 0;
116 ao_packet_rx_len = ao_rx_packet.packet.len;
118 /* Mark the sequence that we've received to
119 * let the sender know when we return a packet
121 rx_seq = ao_rx_packet.packet.seq;
122 ao_tx_packet.ack = rx_seq;
124 /* Poke anyone looking for received data */
125 ao_wakeup(&ao_stdin_ready);
128 ao_packet_restart = 0;
130 /* If the other side has seen the latest data we queued,
131 * wake up any task waiting to send data and let them go again
133 if (ao_rx_packet.packet.ack == ao_tx_packet.seq) {
134 ao_tx_packet.len = 0;
135 ao_wakeup(&ao_tx_packet);
140 #if PACKET_HAS_MASTER
142 ao_packet_flush(void)
144 /* If there is data to send, and this is the master,
145 * then poke the master to send all queued data
147 if (ao_packet_tx_used && ao_packet_master_sleeping)
148 ao_wakeup(&ao_packet_master_sleeping);
150 #endif /* PACKET_HAS_MASTER */
153 ao_packet_putchar(char c)
155 /* No need to block interrupts, all variables here
156 * are only manipulated in task context
158 while (ao_packet_tx_used == AO_PACKET_MAX && ao_packet_enable) {
159 #if PACKET_HAS_MASTER
165 if (ao_packet_enable)
166 tx_data[ao_packet_tx_used++] = c;
169 /* May be called with interrupts blocked */
171 _ao_packet_pollchar(void)
173 if (!ao_packet_enable)
174 return AO_READ_AGAIN;
176 if (ao_packet_rx_used == ao_packet_rx_len)
177 return AO_READ_AGAIN;
179 return rx_data[ao_packet_rx_used++];