Add gps, debug dongle support and pressure alt tables

GPS also pulled in serial support. The altitude tables take raw 11-bit
pressure sample numbers and convert them to standard pressure altitude
values.

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

1 files changed, 3 insertions, 5 deletions

diff --git a/ao_timer.c b/ao_timer.c
index 702159b7..2bd47af1 100644
--- a/ao_timer.c
+++ b/ao_timer.c
@@ -21,12 +21,10 @@ static volatile __data uint16_t ao_tick_count;
 
 uint16_t ao_time(void)
 {
-	volatile bit ea_save;
 	__data uint16_t ret;
-	
-	ea_save = EA;
-	ret = ao_tick_count;
-	EA = ea_save;
+	__critical {
+		ret = ao_tick_count;
+	}
 	return ret;
 }