From 74fb6ec3dc08abaf1a013894b50b65553e3eb631 Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@ideasonboard.com>
Date: Thu, 17 Jan 2019 15:42:26 +0000
Subject: test: timer: Add a 32 bit wraparound test

Add a test which catches a timer running longer than the nanosecond
resolution of 32 bits.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 test/timer.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'test/timer.cpp')

diff --git a/test/timer.cpp b/test/timer.cpp
index e47cb21b..41c132bd 100644
--- a/test/timer.cpp
+++ b/test/timer.cpp
@@ -81,6 +81,19 @@ protected:
 			return TestFail;
 		}
 
+		/*
+		 * 32 bit wrap test
+		 * Nanosecond resolution in a 32 bit value wraps at 4.294967
+		 * seconds (0xFFFFFFFF / 1000000)
+		 */
+		timer.start(4295);
+		dispatcher->processEvents();
+
+		if (timer.isRunning() || timer.jitter() > 50) {
+			cout << "Timer expiration test failed" << endl;
+			return TestFail;
+		}
+
 		/* Timer restart. */
 		timer.start(500);
 
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