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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 __xdata struct ao_packet_recv rx_packet;
static __xdata struct ao_packet tx_packet;
static __xdata char tx_data[AO_PACKET_MAX];
static __xdata char rx_data[AO_PACKET_MAX];
static __pdata uint8_t rx_len, rx_used, tx_used;
static __pdata uint8_t rx_seq;
static __xdata struct ao_task ao_packet_task;
static __xdata uint8_t ao_packet_enable;
static __xdata uint8_t ao_packet_master_sleeping;
void
ao_packet_send(void)
{
ao_config_get();
ao_mutex_get(&ao_radio_mutex);
ao_radio_idle();
RF_CHANNR = ao_config.radio_channel;
ao_dma_set_transfer(ao_radio_dma,
&tx_packet,
&RFDXADDR,
sizeof (struct ao_packet),
DMA_CFG0_WORDSIZE_8 |
DMA_CFG0_TMODE_SINGLE |
DMA_CFG0_TRIGGER_RADIO,
DMA_CFG1_SRCINC_1 |
DMA_CFG1_DESTINC_0 |
DMA_CFG1_PRIORITY_HIGH);
ao_dma_start(ao_radio_dma);
RFST = RFST_STX;
__critical while (!ao_radio_dma_done)
ao_sleep(&ao_radio_dma_done);
ao_mutex_put(&ao_radio_mutex);
}
uint8_t
ao_packet_recv(void)
{
uint8_t dma_done;
ao_config_get();
ao_mutex_get(&ao_radio_mutex);
ao_radio_idle();
RF_CHANNR = ao_config.radio_channel;
ao_dma_set_transfer(ao_radio_dma,
&RFDXADDR,
&rx_packet,
sizeof (struct ao_packet_recv),
DMA_CFG0_WORDSIZE_8 |
DMA_CFG0_TMODE_SINGLE |
DMA_CFG0_TRIGGER_RADIO,
DMA_CFG1_SRCINC_0 |
DMA_CFG1_DESTINC_1 |
DMA_CFG1_PRIORITY_HIGH);
ao_dma_start(ao_radio_dma);
RFST = RFST_SRX;
__critical while (!ao_radio_dma_done)
if (ao_sleep(&ao_radio_dma_done) != 0) {
printf("recv timeout\n"); flush();
ao_radio_abort();
}
dma_done = ao_radio_dma_done;
ao_mutex_put(&ao_radio_mutex);
if (dma_done & AO_DMA_DONE) {
printf ("rssi %d status %x\n", rx_packet.rssi, rx_packet.status); flush();
if (!(rx_packet.status & PKT_APPEND_STATUS_1_CRC_OK)) {
printf ("bad crc\n"); flush();
// return AO_DMA_ABORTED;
}
if (rx_packet.packet.len) {
if (rx_packet.packet.seq == rx_seq + 1 && rx_used == rx_len)
{
memcpy(rx_data, rx_packet.packet.d, rx_packet.packet.len);
rx_used = 0;
rx_len = rx_packet.packet.len;
rx_seq = rx_packet.packet.seq;
tx_packet.ack = rx_seq;
ao_wakeup(&rx_data);
}
}
if (rx_packet.packet.ack == tx_packet.seq) {
tx_packet.len = 0;
ao_wakeup(&tx_packet);
}
}
return dma_done;
}
void
ao_packet_slave(void)
{
tx_packet.addr = ao_serial_number;
ao_radio_set_packet();
while (ao_packet_enable) {
ao_packet_recv();
ao_led_toggle(AO_LED_GREEN);
ao_delay(AO_MS_TO_TICKS(100));
ao_packet_send();
ao_led_toggle(AO_LED_RED);
}
ao_exit();
}
/* Thread for the master side of the packet link */
void
ao_packet_master(void)
{
uint8_t status;
ao_radio_set_packet();
tx_packet.addr = ao_serial_number;
tx_packet.len = AO_PACKET_SYN;
while (ao_packet_enable) {
ao_led_on(AO_LED_RED);
ao_delay(AO_MS_TO_TICKS(100));
ao_packet_send();
ao_led_off(AO_LED_RED);
ao_led_on(AO_LED_GREEN);
ao_alarm(AO_MS_TO_TICKS(1000));
status = ao_packet_recv();
ao_led_off(AO_LED_GREEN);
if (status & AO_DMA_DONE) {
ao_packet_master_sleeping = 1;
ao_delay(AO_MS_TO_TICKS(1000));
ao_packet_master_sleeping = 0;
}
}
ao_exit();
}
void
ao_packet_flush(void)
{
if (!tx_used)
return;
/* Wait for previous packet to be received
*/
while (tx_packet.len)
ao_sleep(&tx_packet);
/* Prepare next packet
*/
if (tx_used) {
memcpy(&tx_packet.d, tx_data, tx_used);
tx_packet.len = tx_used;
tx_packet.seq++;
tx_used = 0;
if (ao_packet_master_sleeping)
ao_wake_task(&ao_packet_task);
}
}
void
ao_packet_putchar(char c)
{
while (tx_used == AO_PACKET_MAX && ao_packet_enable)
ao_packet_flush();
if (ao_packet_enable)
tx_data[tx_used++] = c;
}
char
ao_packet_getchar(void) __critical
{
while (rx_used == rx_len && ao_packet_enable)
ao_sleep(&rx_data);
if (!ao_packet_enable)
return 0;
return rx_data[rx_used++];
}
static void
ao_packet_echo(void) __reentrant
{
uint8_t c;
while (ao_packet_enable) {
c = ao_packet_getchar();
if (ao_packet_enable)
putchar(c);
}
ao_exit();
}
static __xdata struct ao_task ao_packet_echo_task;
static void
ao_packet_forward(void) __reentrant
{
char c;
ao_packet_enable = 1;
ao_cmd_white();
if (ao_cmd_lex_c == 'm')
ao_add_task(&ao_packet_task, ao_packet_master, "master");
else
ao_add_task(&ao_packet_task, ao_packet_slave, "slave");
ao_add_task(&ao_packet_echo_task, ao_packet_echo, "echo");
while ((c = getchar()) != '~') {
ao_packet_putchar(c);
if (c == '\n')
ao_packet_flush();
}
ao_packet_enable = 0;
ao_radio_abort();
while (ao_packet_echo_task.wchan || ao_packet_task.wchan) {
ao_wake_task(&ao_packet_echo_task);
ao_wake_task(&ao_packet_task);
}
#endif
}
__code struct ao_cmds ao_packet_cmds[] = {
{ 'p', ao_packet_forward, "p {m|s} Remote packet link. m=master, s=slave" },
{ 0, ao_packet_forward, NULL },
};
void
ao_packet_init(void)
{
ao_cmd_register(&ao_packet_cmds[0]);
}
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