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/stm/ao_timer.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/stm')

diff --git a/src/stm/ao_timer.c b/src/stm/ao_timer.c
index 9e9436cf..d00deffa 100644
--- a/src/stm/ao_timer.c
+++ b/src/stm/ao_timer.c
@@ -36,6 +36,23 @@ ao_time(void)
 {
 	return ao_tick_count;
 }
+
+uint64_t
+ao_time_ns(void)
+{
+	AO_TICK_TYPE	before, after;
+	uint32_t	cvr;
+
+	do {
+		before = ao_tick_count;
+		cvr = stm_systick.cvr;
+		after = ao_tick_count;
+	} while (before != after);
+
+	return (uint64_t) after * (1000000000ULL / AO_HERTZ) +
+		(uint64_t) cvr * (1000000000ULL / AO_SYSTICK);
+}
+
 #endif
 
 #if AO_DATA_ALL
-- 
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