altos: Keep telemetry and command output from interleaving

When monitoring telemetry, the frame needs to be sent together on one
line, not split with the output of a command (like 'a') mixed in.

Use a mutex for products with monitoring to keep command output and
telemetry output each on separate lines.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/src/kernel/ao.h b/src/kernel/ao.h
index 0f878df5..56945bf5 100644
--- a/src/kernel/ao.h
+++ b/src/kernel/ao.h
@@ -667,6 +667,7 @@ extern __xdata union ao_monitor ao_monitor_ring[AO_MONITOR_RING];
 #define ao_monitor_ring_next(n)	(((n) + 1) & (AO_MONITOR_RING - 1))
 #define ao_monitor_ring_prev(n)	(((n) - 1) & (AO_MONITOR_RING - 1))
 
+extern __data uint8_t ao_monitoring_mutex;
 extern __data uint8_t ao_monitoring;
 extern __data uint8_t ao_monitor_head;