feat(fatfs): add FATFS from esp-idf

Commit ID: 3b16089c

components/fatfs/diskio/diskio_impl.h

@@ -0,0 +1,71 @@
+// Copyright 2017-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// 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.
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+typedef unsigned int UINT;
+typedef unsigned char BYTE;
+typedef uint32_t DWORD;
+
+#include "diskio.h"
+#include "esp_err.h"
+
+/**
+ * Structure of pointers to disk IO driver functions.
+ *
+ * See FatFs documentation for details about these functions
+ */
+typedef struct {
+    DSTATUS (*init) (unsigned char pdrv);    /*!< disk initialization function */
+    DSTATUS (*status) (unsigned char pdrv);  /*!< disk status check function */
+    DRESULT (*read) (unsigned char pdrv, unsigned char* buff, uint32_t sector, unsigned count);  /*!< sector read function */
+    DRESULT (*write) (unsigned char pdrv, const unsigned char* buff, uint32_t sector, unsigned count);   /*!< sector write function */
+    DRESULT (*ioctl) (unsigned char pdrv, unsigned char cmd, void* buff); /*!< function to get info about disk and do some misc operations */
+} ff_diskio_impl_t;
+
+/**
+ * Register or unregister diskio driver for given drive number.
+ *
+ * When FATFS library calls one of disk_xxx functions for driver number pdrv,
+ * corresponding function in discio_impl for given pdrv will be called.
+ *
+ * @param pdrv drive number
+ * @param discio_impl   pointer to ff_diskio_impl_t structure with diskio functions
+ *                      or NULL to unregister and free previously registered drive
+ */
+void ff_diskio_register(BYTE pdrv, const ff_diskio_impl_t* discio_impl);
+
+#define ff_diskio_unregister(pdrv_) ff_diskio_register(pdrv_, NULL)
+
+
+/**
+ * Get next available drive number
+ *
+ * @param   out_pdrv            pointer to the byte to set if successful
+ *
+ * @return  ESP_OK              on success
+ *          ESP_ERR_NOT_FOUND   if all drives are attached
+ */
+esp_err_t ff_diskio_get_drive(BYTE* out_pdrv);
+
+
+#ifdef __cplusplus
+}
+#endif
+