package: add generic FatFs

pkg/fatfs/Makefile

@@ -0,0 +1,13 @@
+PKG_NAME=fatfs
+PKG_URL=https://github.com/MichelRottleuthner/FatFs_for_RIOT.git
+PKG_VERSION=61fd6ae3815170bf7bf6121f33f1ef68c2b11599
+PKG_LICENSE=BSD-1-Clause
+MODULE_MAKEFILE := $(CURDIR)/Makefile.fatfs
+
+.PHONY: all
+
+all: git-download
+	@cp $(MODULE_MAKEFILE) $(PKG_BUILDDIR)/Makefile
+	"$(MAKE)" -C $(PKG_BUILDDIR)
+
+include $(RIOTBASE)/pkg/pkg.mk

pkg/fatfs/Makefile.dep

@@ -0,0 +1,16 @@
+ifneq (,$(filter fatfs_diskio_sdcard_spi,$(USEMODULE)))
+  USEMODULE += sdcard_spi
+endif
+
+ifneq (,$(filter fatfs,$(USEPKG)))
+  USEMODULE += fatfs_diskio_common
+endif
+
+include $(RIOTBASE)/boards/$(BOARD)/Makefile.features
+
+#if periph_rtc is available use it. Otherwise use static timestamps
+ifneq (, $(filter periph_rtc, $(FEATURES_PROVIDED)))
+   export CFLAGS+= -DFATFS_FFCONF_OPT_FS_NORTC=0
+else
+	export CFLAGS+= -DFATFS_FFCONF_OPT_FS_NORTC=1
+endif

pkg/fatfs/Makefile.fatfs

@@ -0,0 +1,3 @@
+MODULE=fatfs
+
+include $(RIOTBASE)/Makefile.base

pkg/fatfs/Makefile.include

@@ -0,0 +1,17 @@
+INCLUDES += -I$(PKGDIRBASE)
+INCLUDES += -I$(RIOTPKG)/fatfs/fatfs_diskio/common/include
+DIRS += $(PKGDIRBASE)/fatfs
+
+DIRS += $(RIOTBASE)/pkg/fatfs/fatfs_diskio/common
+
+ifneq (,$(filter fatfs_diskio_native,$(USEMODULE)))
+  DIRS += $(RIOTBASE)/pkg/fatfs/fatfs_diskio/native
+endif
+
+ifneq (,$(filter fatfs_diskio_sdcard_spi,$(USEMODULE)))
+  DIRS += $(RIOTBASE)/pkg/fatfs/fatfs_diskio/sdcard_spi
+endif
+
+ifeq ($(shell uname -s),Darwin)
+    CFLAGS += -Wno-empty-body
+endif

pkg/fatfs/fatfs_diskio/common/Makefile

@@ -0,0 +1,3 @@
+MODULE = fatfs_diskio_common
+
+include $(RIOTBASE)/Makefile.base

pkg/fatfs/fatfs_diskio/common/fatfs_diskio_common.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2016 Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
+ *
+ * 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  sys_fatfs_diskio
+ * @{
+ *
+ * @file
+ * @brief    Implementation of common FatFs interface for native and sdcard_spi
+ *           Based on low level disk I/O module example for FatFs by ChaN, 2016
+ *
+ * @author   Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
+ *
+ * @}
+ */
+
+#include "fatfs/diskio.h" /* FatFs lower layer API */
+#include "fatfs_diskio_common.h"
+#include "time.h"
+#include "stdint.h"
+
+#if FATFS_FFCONF_OPT_FS_NORTC == 0
+#include "periph/rtc.h"
+
+DWORD get_fattime(void)
+{
+    struct tm time;
+
+    rtc_get_time(&time);
+
+    /* bit 31:25 Year origin from 1980 (0..127) */
+    uint8_t year = time.tm_year + RTC_YEAR_OFFSET - FATFS_YEAR_OFFSET;
+    uint8_t month = time.tm_mon + 1;        /* bit 24:21 month (1..12) */
+    uint8_t day_of_month = time.tm_mon + 1; /* bit 20:16 day (1..31) */
+    uint8_t hour = time.tm_hour;            /* bit 15:11 hour (0..23) */
+    uint8_t minute = time.tm_min;           /* bit 10:5 minute (0..59) */
+    uint8_t second = (time.tm_sec / 2);     /* bit 4:0 second/2 (0..29) */
+
+    return year << FATFS_DISKIO_FATTIME_YEAR_OFFS |
+           month << FATFS_DISKIO_FATTIME_MON_OFFS |
+           day_of_month << FATFS_DISKIO_FATTIME_DAY_OFFS |
+           hour << FATFS_DISKIO_FATTIME_HH_OFFS |
+           minute << FATFS_DISKIO_FATTIME_MM_OFFS |
+           second;
+}
+#endif

pkg/fatfs/fatfs_diskio/common/include/fatfs_diskio_common.h

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2016 Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
+ *
+ * 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     sys_fatfs_diskio
+ * @brief
+ * @{
+ *
+ * @brief       Common defines for fatfs low-level diskio defines
+ * @author      Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
+ */
+
+#ifndef FATFS_DISKIO_COMMON_H
+#define FATFS_DISKIO_COMMON_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "fatfs/diskio.h" /* FatFs lower layer API */
+
+#define RTC_YEAR_OFFSET   (1900)
+#define FATFS_YEAR_OFFSET (1980)
+
+#define FIXED_BLOCK_SIZE (512)
+
+#define FATFS_DISKIO_DSTASTUS_OK (0)
+
+#define FATFS_DISKIO_FATTIME_YEAR_OFFS (25)
+#define FATFS_DISKIO_FATTIME_MON_OFFS  (21)
+#define FATFS_DISKIO_FATTIME_DAY_OFFS  (16)
+#define FATFS_DISKIO_FATTIME_HH_OFFS   (11)
+#define FATFS_DISKIO_FATTIME_MM_OFFS   (5)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* FATFS_DISKIO_COMMON_H */
+/** @} */

pkg/fatfs/fatfs_diskio/native/Makefile

@@ -0,0 +1,7 @@
+MODULE = fatfs_diskio_native
+
+FATFS_DISKIO_NATIVE_DEFAULT_FILE ?= \"riot_fatfs_disk.img\"
+
+CFLAGS += -DFATFS_DISKIO_NATIVE_DEFAULT_FILE=$(FATFS_DISKIO_NATIVE_DEFAULT_FILE)
+
+include $(RIOTBASE)/Makefile.base