tests: drivers: memc: add test for stm32 SDRAM

Add integration test to check r/w operations on STM32 external SDRAM.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

tests/drivers/memc/stm32_sdram/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(integration)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/drivers/memc/stm32_sdram/prj.conf

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+CONFIG_ZTEST=y
+CONFIG_MEMC=y

tests/drivers/memc/stm32_sdram/src/main.c

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+/*
+ * Copyright (c) 2020 Teslabs Engineering S.L.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <ztest.h>
+
+/** Buffer size. */
+#define BUF_SIZE 64U
+
+/**
+ * @brief Helper function to test SDRAM r/w.
+ *
+ * @param mem SDRAM memory location to be tested.
+ */
+static void test_sdram_rw(uint32_t *mem)
+{
+	/* fill memory with number range (0, BUF_SIZE - 1) */
+	for (size_t i = 0U; i < BUF_SIZE; i++) {
+		mem[i] = i;
+	}
+
+	/* check that memory contains written range */
+	for (size_t i = 0U; i < BUF_SIZE; i++) {
+		zassert_equal(mem[i], i, "Unexpected content");
+	}
+}
+
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(sdram1), okay)
+/** Buffer on SDRAM1. */
+__stm32_sdram1_section uint32_t sdram1[BUF_SIZE];
+
+static void test_sdram1_rw(void)
+{
+	test_sdram_rw(sdram1);
+}
+#else
+static void test_sdram1_rw(void)
+{
+	ztest_test_skip();
+}
+#endif
+
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(sdram2), okay)
+/** Buffer on SDRAM2. */
+__stm32_sdram2_section uint32_t sdram2[BUF_SIZE];
+
+static void test_sdram2_rw(void)
+{
+	test_sdram_rw(sdram2);
+}
+
+#else
+static void test_sdram2_rw(void)
+{
+	ztest_test_skip();
+}
+#endif
+
+void test_main(void)
+{
+	ztest_test_suite(stm32_sdram,
+			 ztest_unit_test(test_sdram1_rw),
+			 ztest_unit_test(test_sdram2_rw));
+	ztest_run_test_suite(stm32_sdram);
+}

tests/drivers/memc/stm32_sdram/testcase.yaml

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+tests:
+  drivers.memc.stm32_sdram:
+    tags: drivers memc
+    depends_on: memc
+    filter: dt_compat_enabled("st,stm32-fmc-sdram")