From cd920a0e5321166ef8b1d6afc3d63fc5de998a93 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Mon, 25 Feb 2019 16:42:25 -0700
Subject: altos: add ao_time_ns API

This provides nano-second resolution times by reading the systick
value (which runs at 250ns ticks on stm).

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 src/kernel/ao.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/kernel')

diff --git a/src/kernel/ao.h b/src/kernel/ao.h
index c00de1fe..dddcd9cb 100644
--- a/src/kernel/ao.h
+++ b/src/kernel/ao.h
@@ -117,6 +117,10 @@ extern volatile AO_TICK_TYPE ao_tick_count;
 AO_TICK_TYPE
 ao_time(void);
 
+/* Returns the current time in ns */
+uint64_t
+ao_time_ns(void);
+
 /* Suspend the current task until ticks time has passed */
 void
 ao_delay(uint16_t ticks);
-- 
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