Added NRF52 support

flash_cache.h

@@ -0,0 +1,58 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach for Adafruit Industries
+ *
+ * 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.
+ */
+
+#ifndef FLASH_CACHE_H_
+#define FLASH_CACHE_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define FLASH_CACHE_SIZE          4096        // must be a erasable page size
+#define FLASH_CACHE_INVALID_ADDR  0xffffffff
+
+typedef struct
+{
+    bool (*erase) (uint32_t addr);
+    uint32_t (*program) (uint32_t dst, void const * src, uint32_t len);
+    uint32_t (*read) (void* dst, uint32_t src, uint32_t len);
+    bool (*verify) (uint32_t addr, void const * buf, uint32_t len);
+
+    uint32_t cache_addr;
+    uint8_t* cache_buf;
+} flash_cache_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int flash_cache_write (flash_cache_t* fc, uint32_t dst, void const *src, uint32_t count);
+void flash_cache_flush (flash_cache_t* fc);
+int flash_cache_read (flash_cache_t* fc, void* dst, uint32_t addr, uint32_t count);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* FLASH_CACHE_H_ */
+