From 4b47c3e9b7fd895d8b1340ecd9aec30330a039a9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joakim=20Nohlg=C3=A5rd?= <joakim.nohlgard@eistec.se>
Date: Sat, 3 Oct 2015 22:54:17 +0200
Subject: [PATCH] tests/xtimer_usleep_until: Print statistics at the end

---
 tests/xtimer_usleep_until/Makefile |  2 --
 tests/xtimer_usleep_until/main.c   | 18 ++++++++++++++----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/tests/xtimer_usleep_until/Makefile b/tests/xtimer_usleep_until/Makefile
index 874a05752e..73c8e4b897 100644
--- a/tests/xtimer_usleep_until/Makefile
+++ b/tests/xtimer_usleep_until/Makefile
@@ -9,6 +9,4 @@ BOARD_INSUFFICIENT_MEMORY := chronos
 FEATURES_REQUIRED += periph_timer
 USEMODULE += xtimer
 
-CFLAGS += -DNUMOF=200
-
 include $(RIOTBASE)/Makefile.include
diff --git a/tests/xtimer_usleep_until/main.c b/tests/xtimer_usleep_until/main.c
index 4e79ab3584..5ee77acf71 100644
--- a/tests/xtimer_usleep_until/main.c
+++ b/tests/xtimer_usleep_until/main.c
@@ -33,6 +33,8 @@ int main(void)
     puts("xtimer_usleep_until test application.\n");
 
     uint32_t interval = NUMOF;
+    int32_t max_diff = INT32_MIN;
+    int32_t min_diff = INT32_MAX;
 
     for (int i = 0; i < NUMOF; i++) {
         printf("Testing interval %u... (now=%"PRIu32")\n", (unsigned)interval, xtimer_now());
@@ -46,11 +48,19 @@ int main(void)
     for (int i = 0; i < NUMOF; i++) {
         printf("%4d diff=%"PRIi32"\n", NUMOF-i, res[i]);
 
-        if (res[i] < -1000 || res[i] > 1000) {
-            puts("too large difference.\n");
-            puts("Test Failed.\n");
-            return 1;
+        if (res[i] > max_diff) {
+            max_diff = res[i];
         }
+        if (res[i] < min_diff) {
+            min_diff = res[i];
+        }
+    }
+    printf("\nMin/max error: %" PRId32 "/%" PRId32 "\n", min_diff, max_diff);
+
+    if (min_diff < -1000 || max_diff > 1000) {
+        puts("too large difference.\n");
+        puts("Test Failed.\n");
+        return 1;
     }
 
     printf("\nTest complete.\n");