1 files changed, 284 insertions, 0 deletions
diff --git a/src/core/ao_log.c b/src/core/ao_log.c
new file mode 100644
index 00000000..6d3ad535
--- /dev/null
+++ b/src/core/ao_log.c
@@ -0,0 +1,284 @@
+/*
+ * 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"
+
+__pdata uint32_t ao_log_current_pos;
+__pdata uint32_t ao_log_end_pos;
+__pdata uint32_t ao_log_start_pos;
+__xdata uint8_t	ao_log_running;
+__pdata enum flight_state ao_log_state;
+__xdata uint16_t ao_flight_number;
+
+__code uint8_t ao_log_format = AO_LOG_FORMAT_FULL;
+
+void
+ao_log_flush(void)
+{
+	ao_storage_flush();
+}
+
+/*
+ * When erasing a flight log, make sure the config block
+ * has an up-to-date version of the current flight number
+ */
+
+struct ao_log_erase {
+	uint8_t	unused;
+	uint16_t flight;
+};
+
+static __xdata struct ao_log_erase erase;
+
+#define LOG_MAX_ERASE	16
+
+static uint32_t
+ao_log_erase_pos(uint8_t i)
+{
+	return i * sizeof (struct ao_log_erase) + AO_STORAGE_ERASE_LOG;
+}
+
+void
+ao_log_write_erase(uint8_t pos)
+{
+	erase.unused = 0x00;
+	erase.flight = ao_flight_number;
+	ao_storage_write(ao_log_erase_pos(pos),  &erase, sizeof (erase));
+	ao_storage_flush();
+}
+
+static void
+ao_log_read_erase(uint8_t pos)
+{
+	ao_storage_read(ao_log_erase_pos(pos), &erase, sizeof (erase));
+}
+
+
+static void
+ao_log_erase_mark(void)
+{
+	uint8_t				i;
+
+	for (i = 0; i < LOG_MAX_ERASE; i++) {
+		ao_log_read_erase(i);
+		if (erase.unused == 0 && erase.flight == ao_flight_number)
+			return;
+		if (erase.unused == 0xff) {
+			ao_log_write_erase(i);
+			return;
+		}
+	}
+	ao_config_put();
+}
+
+static uint8_t
+ao_log_slots()
+{
+	return (uint8_t) (ao_storage_config / ao_config.flight_log_max);
+}
+
+uint32_t
+ao_log_pos(uint8_t slot)
+{
+	return ((slot) * ao_config.flight_log_max);
+}
+
+static uint16_t
+ao_log_max_flight(void)
+{
+	uint8_t		log_slot;
+	uint8_t		log_slots;
+	uint16_t	log_flight;
+	uint16_t	max_flight = 0;
+
+	/* Scan the log space looking for the biggest flight number */
+	log_slots = ao_log_slots();
+	for (log_slot = 0; log_slot < log_slots; log_slot++) {
+		log_flight = ao_log_flight(log_slot);
+		if (!log_flight)
+			continue;
+		if (max_flight == 0 || (int16_t) (log_flight - max_flight) > 0)
+			max_flight = log_flight;
+	}
+	return max_flight;
+}
+
+void
+ao_log_scan(void) __reentrant
+{
+	uint8_t		log_slot;
+	uint8_t		log_slots;
+	uint8_t		log_want;
+
+	ao_config_get();
+
+	ao_flight_number = ao_log_max_flight();
+	if (ao_flight_number)
+		if (++ao_flight_number == 0)
+			ao_flight_number = 1;
+
+	/* Now look through the log of flight numbers from erase operations and
+	 * see if the last one is bigger than what we found above
+	 */
+	for (log_slot = LOG_MAX_ERASE; log_slot-- > 0;) {
+		ao_log_read_erase(log_slot);
+		if (erase.unused == 0) {
+			if (ao_flight_number == 0 ||
+			    (int16_t) (erase.flight - ao_flight_number) > 0)
+				ao_flight_number = erase.flight;
+			break;
+		}
+	}
+	if (ao_flight_number == 0)
+		ao_flight_number = 1;
+
+	/* With a flight number in hand, find a place to write a new log,
+	 * use the target flight number to index the available log slots so
+	 * that we write logs to each spot about the same number of times.
+	 */
+
+	/* Find a log slot for the next flight, if available */
+	ao_log_current_pos = ao_log_end_pos = 0;
+	log_slots = ao_log_slots();
+	log_want = (ao_flight_number - 1) % log_slots;
+	log_slot = log_want;
+	do {
+		if (ao_log_flight(log_slot) == 0) {
+			ao_log_current_pos = ao_log_pos(log_slot);
+			ao_log_end_pos = ao_log_current_pos + ao_config.flight_log_max;
+			break;
+		}
+		if (++log_slot >= log_slots)
+			log_slot = 0;
+	} while (log_slot != log_want);
+
+	ao_wakeup(&ao_flight_number);
+}
+
+void
+ao_log_start(void)
+{
+	/* start logging */
+	ao_log_running = 1;
+	ao_wakeup(&ao_log_running);
+}
+
+void
+ao_log_stop(void)
+{
+	ao_log_running = 0;
+	ao_log_flush();
+}
+
+uint8_t
+ao_log_present(void)
+{
+	return ao_log_max_flight() != 0;
+}
+
+uint8_t
+ao_log_full(void)
+{
+	return ao_log_current_pos == ao_log_end_pos;
+}
+
+static __xdata struct ao_task ao_log_task;
+
+void
+ao_log_list(void) __reentrant
+{
+	uint8_t	slot;
+	uint8_t slots;
+	uint16_t flight;
+
+	slots = ao_log_slots();
+	for (slot = 0; slot < slots; slot++)
+	{
+		flight = ao_log_flight(slot);
+		if (flight)
+			printf ("flight %d start %x end %x\n",
+				flight,
+				(uint16_t) (ao_log_pos(slot) >> 8),
+				(uint16_t) (ao_log_pos(slot+1) >> 8));
+	}
+	printf ("done\n");
+}
+
+void
+ao_log_delete(void) __reentrant
+{
+	uint8_t slot;
+	uint8_t slots;
+
+	ao_cmd_decimal();
+	if (ao_cmd_status != ao_cmd_success)
+		return;
+
+	slots = ao_log_slots();
+	/* Look for the flight log matching the requested flight */
+	if (ao_cmd_lex_i) {
+		for (slot = 0; slot < slots; slot++) {
+			if (ao_log_flight(slot) == ao_cmd_lex_i) {
+				ao_log_erase_mark();
+				ao_log_current_pos = ao_log_pos(slot);
+				ao_log_end_pos = ao_log_current_pos + ao_config.flight_log_max;
+				while (ao_log_current_pos < ao_log_end_pos) {
+					uint8_t	i;
+					static __xdata uint8_t b;
+
+					/*
+					 * Check to see if we've reached the end of
+					 * the used memory to avoid re-erasing the same
+					 * memory over and over again
+					 */
+					for (i = 0; i < 16; i++) {
+						if (ao_storage_read(ao_log_current_pos + i, &b, 1))
+							if (b != 0xff)
+								break;
+					}
+					if (i == 16)
+						break;
+					ao_storage_erase(ao_log_current_pos);
+					ao_log_current_pos += ao_storage_block;
+				}
+				puts("Erased");
+				return;
+			}
+		}
+	}
+	printf("No such flight: %d\n", ao_cmd_lex_i);
+}
+
+__code struct ao_cmds ao_log_cmds[] = {
+	{ ao_log_list,	"l\0List flight logs" },
+	{ ao_log_delete,	"d <flight-number>\0Delete flight" },
+	{ 0,	NULL },
+};
+
+void
+ao_log_init(void)
+{
+	ao_log_running = 0;
+
+	/* For now, just log the flight starting at the begining of eeprom */
+	ao_log_state = ao_flight_invalid;
+
+	ao_cmd_register(&ao_log_cmds[0]);
+
+	/* Create a task to log events to eeprom */
+	ao_add_task(&ao_log_task, ao_log, "log");
+}