Enable packet-based communcation to command processor

This splits the packet code into master/slave halves and hooks the
slave side up to the getchar/putchar/flush logic in ao_stdio.c

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/src/ao_packet_master.c b/src/ao_packet_master.c
new file mode 100644
index 00000000..2751f414
--- /dev/null
+++ b/src/ao_packet_master.c
@@ -0,0 +1,142 @@
+/*
+ * 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)
+{
+	char c;
+	while ((c = ao_packet_pollchar()) == AO_READ_AGAIN)
+	{
+		if (!ao_packet_enable)
+			break;
+		if (ao_packet_master_sleeping)
+			ao_wake_task(&ao_packet_task);
+		ao_sleep(&ao_stdin_ready);
+	}
+	return c;
+}
+
+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 __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)
+{
+	uint8_t	status;
+
+	ao_radio_set_packet();
+	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) {
+		ao_packet_send();
+		if (ao_tx_packet.len)
+			ao_packet_master_busy();
+		ao_packet_master_check_busy();
+		ao_alarm(ao_packet_master_delay);
+		status = ao_packet_recv();
+		if (status & AO_DMA_DONE) {
+			/* 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();
+			else
+				flush();
+			ao_packet_master_sleeping = 1;
+			ao_delay(ao_packet_master_delay);
+			ao_packet_master_sleeping = 0;
+		}
+	}
+	ao_exit();
+}
+
+static void
+ao_packet_forward(void) __reentrant
+{
+	char c;
+	ao_packet_enable = 1;
+	ao_cmd_white();
+
+	flush();
+	ao_set_monitor(0);
+	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);
+	}
+	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);
+		ao_yield();
+	}
+}
+
+
+
+__code struct ao_cmds ao_packet_master_cmds[] = {
+	{ 'p',	ao_packet_forward,	"p                                  Remote packet link." },
+	{ 0,	ao_packet_forward,	NULL },
+};
+
+void
+ao_packet_master_init(void)
+{
+	ao_cmd_register(&ao_packet_master_cmds[0]);
+}