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; version 2 of the License.
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.
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.
20 __xdata struct ao_packet_recv ao_rx_packet;
21 __xdata struct ao_packet ao_tx_packet;
22 __pdata uint8_t ao_packet_rx_len, ao_packet_rx_used, ao_packet_tx_used;
24 static __xdata char tx_data[AO_PACKET_MAX];
25 static __xdata char rx_data[AO_PACKET_MAX];
26 static __pdata uint8_t rx_seq;
28 __xdata struct ao_task ao_packet_task;
29 __xdata uint8_t ao_packet_enable;
30 __xdata uint8_t ao_packet_master_sleeping;
35 ao_led_on(AO_LED_RED);
38 /* If any tx data is pending then copy it into the tx packet */
39 if (ao_packet_tx_used && ao_tx_packet.len == 0) {
40 memcpy(&ao_tx_packet.d, tx_data, ao_packet_tx_used);
41 ao_tx_packet.len = ao_packet_tx_used;
43 ao_packet_tx_used = 0;
47 ao_dma_set_transfer(ao_radio_dma,
50 sizeof (struct ao_packet),
52 DMA_CFG0_TMODE_SINGLE |
53 DMA_CFG0_TRIGGER_RADIO,
56 DMA_CFG1_PRIORITY_HIGH);
57 ao_dma_start(ao_radio_dma);
59 __critical while (!ao_radio_done)
60 ao_sleep(&ao_radio_done);
62 ao_led_off(AO_LED_RED);
71 ao_led_on(AO_LED_GREEN);
74 ao_dma_set_transfer(ao_radio_dma,
77 sizeof (struct ao_packet_recv),
79 DMA_CFG0_TMODE_SINGLE |
80 DMA_CFG0_TRIGGER_RADIO,
83 DMA_CFG1_PRIORITY_HIGH);
84 ao_dma_start(ao_radio_dma);
86 __critical while (!ao_radio_dma_done)
87 if (ao_sleep(&ao_radio_dma_done) != 0)
89 dma_done = ao_radio_dma_done;
92 ao_led_off(AO_LED_GREEN);
95 if (dma_done & AO_DMA_DONE) {
96 if (!(ao_rx_packet.status & PKT_APPEND_STATUS_1_CRC_OK))
97 return AO_DMA_ABORTED;
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) {
103 if (ao_rx_packet.packet.seq == (uint8_t) (rx_seq + (uint8_t) 1) && ao_packet_rx_used == ao_packet_rx_len) {
104 memcpy(rx_data, ao_rx_packet.packet.d, ao_rx_packet.packet.len);
105 ao_packet_rx_used = 0;
106 ao_packet_rx_len = ao_rx_packet.packet.len;
107 rx_seq = ao_rx_packet.packet.seq;
108 ao_tx_packet.ack = rx_seq;
109 ao_wakeup(&ao_stdin_ready);
112 if (ao_rx_packet.packet.ack == ao_tx_packet.seq) {
113 ao_tx_packet.len = 0;
114 ao_wakeup(&ao_tx_packet);
120 #ifndef PACKET_HAS_MASTER
121 #define PACKET_HAS_MASTER 1
124 #if PACKET_HAS_MASTER
126 ao_packet_flush(void)
128 /* If there is data to send, and this is the master,
129 * then poke the master to send all queued data
131 if (ao_packet_tx_used && ao_packet_master_sleeping)
132 ao_wake_task(&ao_packet_task);
134 #endif /* PACKET_HAS_MASTER */
137 ao_packet_putchar(char c) __reentrant
139 while (ao_packet_tx_used == AO_PACKET_MAX && ao_packet_enable) {
140 #if PACKET_HAS_MASTER
146 if (ao_packet_enable)
147 tx_data[ao_packet_tx_used++] = c;
151 ao_packet_pollchar(void) __critical
153 if (!ao_packet_enable)
154 return AO_READ_AGAIN;
156 if (ao_packet_rx_used == ao_packet_rx_len)
157 return AO_READ_AGAIN;
159 return rx_data[ao_packet_rx_used++];