renesas-ra/modrenesas: Expose the Flash block device to Python code.

A new module called renesas is added, like in other ports.  The accessible
block device allows to use Python methods for creating and modifying the
file system.  The Flash block device for the file system can be accessed
with:

    from renesas import Flash
    bdev = Flash(start=0)

Signed-off-by: robert-hh <[email protected]>

Author: robert-hh

ports/renesas-ra/Makefile

@@ -250,6 +250,7 @@ SRC_C += \
 	machine_pin.c \
 	machine_rtc.c \
 	machine_sdcard.c \
+	modrenesas.c \
 	extint.c \
 	usrsw.c \
 	flash.c \

ports/renesas-ra/modrenesas.c

@@ -0,0 +1,41 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+#include "storage.h"
+
+static const mp_rom_map_elem_t renesas_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_renesas) },
+    { MP_ROM_QSTR(MP_QSTR_Flash),    MP_ROM_PTR(&pyb_flash_type) },
+};
+static MP_DEFINE_CONST_DICT(renesas_module_globals, renesas_module_globals_table);
+
+const mp_obj_module_t mp_module_renesas = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&renesas_module_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_renesas, mp_module_renesas);