tests: Add ADC peripheral tests

boards/meshme/include/periph_conf.h

@@ -70,7 +70,7 @@ extern "C" {
 /**
  * @brief Available ADC lines
  */
-static const adc_conf_t adc_config[] = { 
+static const adc_conf_t adc_config[] = {
     GPIO_PIN(PORT_A, 6), /*!< GPIO_PA6 as ADC input */
     GPIO_PIN(PORT_A, 7), /*!< GPIO_PA7 as ADC input */
 };

tests/periph_adc/Makefile

@@ -0,0 +1,9 @@
+include ../Makefile.tests_common
+
+FEATURES_REQUIRED = periph_adc
+
+USEMODULE += ztimer
+USEMODULE += ztimer_msec
+USEMODULE += embunit
+
+include $(RIOTBASE)/Makefile.include

tests/periph_adc/app.config.test

@@ -0,0 +1,10 @@
+# this file enables modules defined in Kconfig. Do not use this file for
+# application configuration. This is only needed during migration.
+# enable ADC peripheral driver
+CONFIG_MODULE_PERIPH_ADC=y
+
+# enable xtimer to wake up periodically
+CONFIG_MODULE_ZTIMER=y
+CONFIG_MODULE_ZTIMER_MSEC=y
+
+CONFIG_MODULE_EMBUNIT=y

tests/periph_adc/doc.txt

@@ -0,0 +1,15 @@
+/**
+@defgroup      periph_adc
+@ingroup       test_group
+@{
+
+## Test the [A]nalog to [D]igital [C}onverter peripheral
+
+To test the code in automatic mode:
+
+```c
+make flash test
+```
+
+@}
+ */

tests/periph_adc/main.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2022 Mesh4all mesh4all.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @brief       ADC test
+ *
+ * @author      Luis A. Ruiz <[email protected]>
+ */
+#include <string.h>
+#include <errno.h>
+#include "periph/adc.h"
+#include "ztimer.h"
+#include "embUnit.h"
+
+#define RES ADC_RES_10BIT
+#define DELAY_MS 100U
+#define LAPS 5
+
+/* initialize all available ADC lines */
+void test_adc_init(void) {
+    int err;
+    for (unsigned i = 0; i < ADC_NUMOF; i++) {
+        if (adc_init(ADC_LINE(i)) < 0) {
+            printf("\nInitialization of ADC_LINE(%u) failed\n", i);
+            err = 1;
+        } else {
+            printf("\nSuccessfully initialized ADC_LINE(%u)\n", i);
+            printf("Channel %u of %u\n", i + 1, ADC_NUMOF);
+            err = 0;
+        }
+        ztimer_sleep(ZTIMER_MSEC, DELAY_MS);
+    }
+
+    TEST_ASSERT_EQUAL_INT(0, err);
+}
+
+void test_adc_read(void) {
+    int err;
+    int sample;
+    for (int lap = 0; lap < LAPS; lap++) {
+
+        printf("\nRound %d of %d\n", lap + 1, LAPS);
+
+        for (unsigned i = 0; i < ADC_NUMOF; i++) {
+            sample = adc_sample(ADC_LINE(i), RES);
+            if (sample < 0) {
+                printf("ADC_LINE(%u): selected resolution not applicable\n", i);
+                err = 1;
+            } else {
+                printf("ADC_LINE(%u): %i\n", i, sample);
+                err = 0;
+            }
+        }
+        ztimer_sleep(ZTIMER_MSEC, DELAY_MS);
+    }
+
+    TEST_ASSERT_EQUAL_INT(0, err);
+}
+
+Test *test_periph_adc(void) {
+
+    EMB_UNIT_TESTFIXTURES(fixtures){
+        new_TestFixture(test_adc_init), // init. ADC lines available
+        new_TestFixture(test_adc_read), // read value for each line
+    };
+
+    EMB_UNIT_TESTCALLER(test_periph_adc, NULL, NULL, fixtures);
+
+    return (Test *)&test_periph_adc;
+}
+int main(void) {
+    printf("Test ADC peripherals\n");
+    TESTS_START();
+    TESTS_RUN(test_periph_adc());
+    TESTS_END();
+    return 0;
+}

tests/periph_adc/tests/01-run.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2017 Freie Universität Berlin
+#
+# 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.
+
+import sys
+from testrunner import run_check_unittests
+
+if __name__ == "__main__":
+    sys.exit(run_check_unittests())