1 files changed, 39 insertions, 0 deletions
diff --git a/test/timer_dos.c b/test/timer_dos.c
new file mode 100644
index 0000000000..b0c37a4eaf
--- /dev/null
+++ b/test/timer_dos.c
@@ -0,0 +1,39 @@
+/* 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 timer test.
+ */
+
+#include "common.h"
+#include "uart.h"
+#include "task.h"
+#include "timer.h"
+
+/* Linear congruential pseudo random number generator*/
+static uint32_t prng(uint32_t x)
+{
+	return 22695477 * x + 1;
+}
+
+/* period between 500us and 128ms */
+#define PERIOD_US(num) (((num % 256) + 1) * 500)
+
+int TaskTimer(void *seed)
+{
+	uint32_t num = (uint32_t)seed;
+	task_id_t id = task_get_current();
+
+	uart_printf("\n[Timer task %d]\n", id);
+
+	while (1) {
+		/* Wait for a "random" period */
+		task_wait_msg(PERIOD_US(num));
+		uart_printf("%01d\n", id);
+		/* next pseudo random delay */
+		num = prng(num);
+	}
+
+	return EC_SUCCESS;
+}