From 2775c720185770a858173798f92469a66f2b22b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabian=20H=C3=BC=C3=9Fler?= <fabian.huessler@st.ovgu.de>
Date: Sun, 10 Oct 2021 17:33:28 +0200
Subject: [PATCH] tests/driver_vbat: add test for backup battery monitoring

---
 tests/periph_vbat/Makefile        |  6 +++++
 tests/periph_vbat/README.md       |  5 ++++
 tests/periph_vbat/app.config.test |  5 ++++
 tests/periph_vbat/main.c          | 42 +++++++++++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 tests/periph_vbat/Makefile
 create mode 100644 tests/periph_vbat/README.md
 create mode 100644 tests/periph_vbat/app.config.test
 create mode 100644 tests/periph_vbat/main.c

diff --git a/tests/periph_vbat/Makefile b/tests/periph_vbat/Makefile
new file mode 100644
index 0000000000..ba1d50c726
--- /dev/null
+++ b/tests/periph_vbat/Makefile
@@ -0,0 +1,6 @@
+include ../Makefile.tests_common
+
+FEATURES_REQUIRED += periph_vbat
+USEMODULE += ztimer ztimer_msec
+
+include $(RIOTBASE)/Makefile.include
diff --git a/tests/periph_vbat/README.md b/tests/periph_vbat/README.md
new file mode 100644
index 0000000000..77299e3e49
--- /dev/null
+++ b/tests/periph_vbat/README.md
@@ -0,0 +1,5 @@
+Backup Battery Monitoring Application
+=====================================
+
+This test regularly samples the backup battery voltage and prints the result
+to the serial console.
diff --git a/tests/periph_vbat/app.config.test b/tests/periph_vbat/app.config.test
new file mode 100644
index 0000000000..53f7c7a820
--- /dev/null
+++ b/tests/periph_vbat/app.config.test
@@ -0,0 +1,5 @@
+# this file enables modules defined in Kconfig. Do not use this file for
+# application configuration. This is only needed during migration.
+CONFIG_MODULE_ZTIMER=y
+CONFIG_MODULE_ZTIMER_MSEC=y
+CONFIG_MODULE_PERIPH_VBAT=y
diff --git a/tests/periph_vbat/main.c b/tests/periph_vbat/main.c
new file mode 100644
index 0000000000..47d7988fea
--- /dev/null
+++ b/tests/periph_vbat/main.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2022 Otto-von-Guericke-Universität Magdeburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for backup battery monitoring
+ *
+ * @author      Fabian Hüßler <fabian.huessler@ovgu.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "board.h"
+#include "ztimer.h"
+#include "periph/vbat.h"
+
+int main(void)
+{
+    puts("\nRIOT backup battery monitoring test\n");
+    puts("This test will sample the backup battery once a second\n\n");
+
+    int32_t bat_mv;
+    while (1) {
+        if ((bat_mv = vbat_sample_mv()) < 0) {
+            return 1;
+        }
+        printf("VBAT: %"PRIi32"[mV]\n", bat_mv);
+        ztimer_sleep(ZTIMER_MSEC, 1000);
+    }
+    return 0;
+}