boards/waveshare-nrf52840-eval-kit: add SD card as MTD

boards/waveshare-nrf52840-eval-kit/Makefile.dep

@@ -2,4 +2,14 @@ ifneq (,$(filter saul_default,$(USEMODULE)))
   USEMODULE += saul_gpio
 endif
 
+ifneq (,$(filter mtd,$(USEMODULE)))
+  USEMODULE += mtd_sdcard
+endif
+
+# default to using fatfs on SD card
+ifneq (,$(filter vfs_default,$(USEMODULE)))
+  USEMODULE += fatfs_vfs
+  USEMODULE += mtd
+endif
+
 include $(RIOTBOARD)/common/nrf52/Makefile.dep

boards/waveshare-nrf52840-eval-kit/board.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2022 Gunar Schorcht
+ *
+ * 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     boards_waveshare_nrf52840_eval_kit
+ * @{
+ *
+ * @file
+ * @brief       Board specific definitions for Waveshare nRF52840 Eval Kit
+ *
+ * @author      Gunar Schorcht <gunar@schorcht.net>
+ */
+
+#if defined(MODULE_MTD_SDCARD)
+
+#include "board.h"
+#include "kernel_defines.h"
+
+#include "mtd_sdcard.h"
+#include "sdcard_spi.h"
+#include "sdcard_spi_params.h"
+
+#if defined(MODULE_FATFS_VFS)
+#include "fs/fatfs.h"
+#include "vfs_default.h"
+#endif
+
+/* this is provided by the sdcard_spi driver see drivers/sdcard_spi/sdcard_spi.c */
+extern sdcard_spi_t sdcard_spi_devs[ARRAY_SIZE(sdcard_spi_params)];
+
+mtd_sdcard_t mtd_sdcard_dev = {
+    .base = {
+        .driver = &mtd_sdcard_driver,
+    },
+    .sd_card = &sdcard_spi_devs[0],
+    .params = &sdcard_spi_params[0]
+};
+
+mtd_dev_t *mtd0 = (mtd_dev_t *)&mtd_sdcard_dev;
+
+#if IS_USED(MODULE_FATFS_VFS)
+VFS_AUTO_MOUNT(fatfs, VFS_MTD(mtd_sdcard_dev), VFS_DEFAULT_SD(0), 0);
+#endif /* MODULE_FATFS_VFS */
+
+#endif /* MODULE_MTD_SDCARD */
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+/** @} */