Initial Commit

tools/sdk/esp32s2/include/fatfs/vfs/vfs_fat_internal.h

@@ -0,0 +1,30 @@
+// Copyright 2018 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
+
+#include "esp_vfs_fat.h"
+#include <sys/param.h>
+#include <stddef.h>
+
+static inline size_t esp_vfs_fat_get_allocation_unit_size(
+        size_t sector_size, size_t requested_size)
+{
+    size_t alloc_unit_size = requested_size;
+    const size_t max_sectors_per_cylinder = 128;
+    const size_t max_size = sector_size * max_sectors_per_cylinder;
+    alloc_unit_size = MAX(alloc_unit_size, sector_size);
+    alloc_unit_size = MIN(alloc_unit_size, max_size);
+    return alloc_unit_size;
+}