From 57f2bd9934a0d8ff02c041ac3f063ea38a3e6f5a Mon Sep 17 00:00:00 2001
From: Koen Zandberg <koen@bergzand.net>
Date: Tue, 22 Sep 2020 22:34:55 +0200
Subject: [PATCH] tests/periph_timer_periodic: Use fmt for in-irq printing

This replaces the printf statement in the timer callback with fmt-based
printing and a single puts. This is less heavy on the stack usage than
printf, making this test a bit easier to digest on the smaller
platforms.
---
 tests/periph_timer_periodic/Makefile | 2 ++
 tests/periph_timer_periodic/main.c   | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tests/periph_timer_periodic/Makefile b/tests/periph_timer_periodic/Makefile
index f3bc668f72..b756db5c95 100644
--- a/tests/periph_timer_periodic/Makefile
+++ b/tests/periph_timer_periodic/Makefile
@@ -2,4 +2,6 @@ include ../Makefile.tests_common
 
 FEATURES_REQUIRED = periph_timer_periodic
 
+USEMODULE += fmt
+
 include $(RIOTBASE)/Makefile.include
diff --git a/tests/periph_timer_periodic/main.c b/tests/periph_timer_periodic/main.c
index 92461b8a07..2f3be4830b 100644
--- a/tests/periph_timer_periodic/main.c
+++ b/tests/periph_timer_periodic/main.c
@@ -23,6 +23,8 @@
 
 #include "board.h"
 #include "macros/units.h"
+
+#include "fmt.h"
 #include "mutex.h"
 #include "periph/timer.h"
 #include "test_utils/expect.h"
@@ -61,7 +63,9 @@ static void cb(void *arg, int chan)
 {
     unsigned c = count[chan]++;
 
-    printf("[%d] tick\n", chan);
+    print_str("[");
+    print_u32_dec(chan);
+    print_str("] tick\n");
 
     if (c > CYCLES_MAX) {
         timer_stop(TIMER_CYCL);