124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "supervisor/flash.h"
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#include <stdint.h>
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#include <string.h>
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#include "extmod/vfs.h"
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#include "extmod/vfs_fat.h"
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#include "py/mphal.h"
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "lib/oofatfs/ff.h"
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#include "peripherals/nrf/nvm.h"
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#ifdef BLUETOOTH_SD
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#include "ble_drv.h"
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#include "nrf_sdm.h"
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#endif
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// defined in linker
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extern uint32_t __fatfs_flash_start_addr[];
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extern uint32_t __fatfs_flash_length[];
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#define NO_CACHE 0xffffffff
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uint8_t _flash_cache[FLASH_PAGE_SIZE] __attribute__((aligned(4)));
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uint32_t _flash_page_addr = NO_CACHE;
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/*------------------------------------------------------------------*/
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/* Internal Flash API
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*------------------------------------------------------------------*/
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static inline uint32_t lba2addr(uint32_t block) {
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return ((uint32_t)__fatfs_flash_start_addr) + block * FILESYSTEM_BLOCK_SIZE;
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}
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void supervisor_flash_init(void) {
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}
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uint32_t supervisor_flash_get_block_size(void) {
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return FILESYSTEM_BLOCK_SIZE;
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}
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uint32_t supervisor_flash_get_block_count(void) {
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return ((uint32_t) __fatfs_flash_length - CIRCUITPY_INTERNAL_NVM_SIZE) / FILESYSTEM_BLOCK_SIZE ;
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}
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void supervisor_flash_flush(void) {
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if (_flash_page_addr == NO_CACHE) return;
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// Skip if data is the same
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if (memcmp(_flash_cache, (void *)_flash_page_addr, FLASH_PAGE_SIZE) != 0) {
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nrf_nvm_safe_flash_page_write(_flash_page_addr, _flash_cache);
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}
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}
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mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
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// Must write out anything in cache before trying to read.
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supervisor_flash_flush();
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uint32_t src = lba2addr(block);
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memcpy(dest, (uint8_t*) src, FILESYSTEM_BLOCK_SIZE*num_blocks);
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return 0; // success
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}
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mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32_t num_blocks) {
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while (num_blocks) {
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uint32_t const addr = lba2addr(lba);
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uint32_t const page_addr = addr & ~(FLASH_PAGE_SIZE - 1);
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uint32_t count = 8 - (lba % 8); // up to page boundary
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count = MIN(num_blocks, count);
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if (page_addr != _flash_page_addr) {
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// Write out anything in cache before overwriting it.
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supervisor_flash_flush();
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_flash_page_addr = page_addr;
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// Copy the current contents of the entire page into the cache.
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memcpy(_flash_cache, (void *)page_addr, FLASH_PAGE_SIZE);
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}
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// Overwrite part or all of the page cache with the src data.
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memcpy(_flash_cache + (addr & (FLASH_PAGE_SIZE - 1)), src, count * FILESYSTEM_BLOCK_SIZE);
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// adjust for next run
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lba += count;
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src += count * FILESYSTEM_BLOCK_SIZE;
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num_blocks -= count;
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}
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return 0; // success
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}
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void supervisor_flash_release_cache(void) {
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}
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