Initial sources import 3/3

source files mainly done by Vincent.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

Change-Id: Ic2d1becd400c9b4b4a14d4a243af1bdf77d9c1e2

1 files changed, 55 insertions, 0 deletions

diff --git a/test/timer_calib.c b/test/timer_calib.c
new file mode 100644
index 0000000000..1169491c86
--- /dev/null
+++ b/test/timer_calib.c
@@ -0,0 +1,55 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ * Copyright 2011 Google Inc.
+ *
+ * Tasks for scheduling test.
+ */
+
+#include "common.h"
+#include "uart.h"
+#include "task.h"
+#include "timer.h"
+
+uint32_t difftime(timestamp_t t0, timestamp_t t1)
+{
+	return (uint32_t)(t1.val-t0.val);
+}
+
+int timer_calib_task(void *data)
+{
+	timestamp_t t0, t1;
+	unsigned d;
+
+	uart_printf("\n=== Timer calibration ===\n");
+
+	t0 = get_time();
+	t1 = get_time();
+	uart_printf("- back-to-back get_time : %d us\n", difftime(t0, t1));
+
+	/* Sleep for 5 seconds */
+	uart_printf("- sleep 1s :\n  ");
+	uart_flush_output();
+	uart_printf("Go...");
+	t0 = get_time();
+	usleep(1000000);
+	t1 = get_time();
+	uart_printf("done. delay = %d us\n", difftime(t0, t1));
+	
+	/* try small usleep */
+	uart_printf("- short sleep :\n");
+	uart_flush_output();
+	for (d=128 ; d > 0; d = d / 2) {
+		t0 = get_time();
+		usleep(d);
+		t1 = get_time();
+		uart_printf("  %d us => %d us\n", d, difftime(t0, t1));
+		uart_flush_output();
+	}
+
+	uart_printf("Done.\n");
+	/* sleep forever */
+	task_wait_msg(-1);
+
+	return EC_SUCCESS;
+}