Enable packet-based communcation to command processor

[fw/altos] / src / ao_packet_master.c

diff --git a/src/ao_packet_master.c b/src/ao_packet_master.c
new file mode 100644 (file)
index 0000000..2751f41
--- /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]);
+}