altos: Clear out eeprom erase records when writing entry 0

When writing config/erase to eeprom, there's no 'erase' operation as
on-chip eeprom is writable at a byte level. As such, we can't tell
when the erase blocks get reset when the config gets written. When
this happens, erase block 0 gets written explicitly, so just use that
call to trigger explicit erasing of the data.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/src/kernel/ao_log.c b/src/kernel/ao_log.c
index 76e0e68c..3cf85a33 100644
--- a/src/kernel/ao_log.c
+++ b/src/kernel/ao_log.c
@@ -67,6 +67,18 @@ ao_log_write_erase(uint8_t pos)
 	erase.mark = LOG_ERASE_MARK;
 	erase.flight = ao_flight_number;
 	ao_config_write(ao_log_erase_pos(pos),  &erase, sizeof (erase));
+
+#if USE_EEPROM_CONFIG
+	if (pos == 0) {
+		uint8_t	i;
+		for (i = 1; i < LOG_MAX_ERASE; i++) {
+			erase.mark = ~LOG_ERASE_MARK;
+			erase.flight = 0;
+			ao_config_write(ao_log_erase_pos(i), &erase, sizeof (erase));
+		}
+	}
+#endif
+
 	ao_config_flush();
 }