mirror of
https://github.com/taigrr/arduinolibs
synced 2025-01-18 04:33:12 -08:00
102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*
|
|
* Copyright (C) 2018 Southern Storm Software, Pty Ltd.
|
|
*
|
|
* 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 CRYPTO_SAMFLASHUTIL_H
|
|
#define CRYPTO_SAMFLASHUTIL_H
|
|
|
|
// Utility definitions for accessing flash memory in the
|
|
// Arduino Due and other SAM-based Arduino variants.
|
|
|
|
#if defined (__arm__) && defined (__SAM3X8E__)
|
|
|
|
#include <Arduino.h>
|
|
|
|
// Find the highest-numbered flash memory region on this device.
|
|
#if defined(IFLASH1_ADDR)
|
|
#define SAM_FLASH_ADDR IFLASH1_ADDR
|
|
#define SAM_FLASH_SIZE IFLASH1_SIZE
|
|
#define SAM_FLASH_PAGE_SIZE IFLASH1_PAGE_SIZE
|
|
#define SAM_FLASH_REGION_SIZE IFLASH1_LOCK_REGION_SIZE
|
|
#define SAM_EFC EFC1
|
|
#elif defined(IFLASH0_ADDR)
|
|
#define SAM_FLASH_ADDR IFLASH0_ADDR
|
|
#define SAM_FLASH_SIZE IFLASH0_SIZE
|
|
#define SAM_FLASH_PAGE_SIZE IFLASH0_PAGE_SIZE
|
|
#define SAM_FLASH_REGION_SIZE IFLASH0_LOCK_REGION_SIZE
|
|
#define SAM_EFC EFC0
|
|
#else
|
|
#define SAM_FLASH_ADDR IFLASH_ADDR
|
|
#define SAM_FLASH_SIZE IFLASH_SIZE
|
|
#define SAM_FLASH_PAGE_SIZE IFLASH_PAGE_SIZE
|
|
#define SAM_FLASH_REGION_SIZE IFLASH_LOCK_REGION_SIZE
|
|
#define SAM_EFC EFC
|
|
#endif
|
|
|
|
// Storage for the RNG seed in the last page of flash memory.
|
|
#define RNG_SEED_ADDR (SAM_FLASH_ADDR + SAM_FLASH_SIZE - SAM_FLASH_PAGE_SIZE)
|
|
#define RNG_SEED_PAGE ((SAM_FLASH_SIZE / SAM_FLASH_PAGE_SIZE) - 1)
|
|
|
|
// Storage for the KeyRing implementation.
|
|
#define KEY_RING_STORAGE_SIZE 4096
|
|
#define KEY_RING_STORAGE_ADDR \
|
|
(SAM_FLASH_ADDR + SAM_FLASH_SIZE - KEY_RING_STORAGE_SIZE - \
|
|
SAM_FLASH_PAGE_SIZE)
|
|
#define KEY_RING_STORAGE_NUM_PAGES \
|
|
(KEY_RING_STORAGE_SIZE / SAM_FLASH_PAGE_SIZE)
|
|
#define KEY_RING_STORAGE_FIRST_PAGE \
|
|
((SAM_FLASH_SIZE / SAM_FLASH_PAGE_SIZE) - KEY_RING_STORAGE_NUM_PAGES - 1)
|
|
|
|
// Initialize the device for write access to flash memory.
|
|
inline void crypto_sam_flash_init(void)
|
|
{
|
|
// Initialize the flash memory chip for access mode 128 and 6 wait states.
|
|
efc_init(SAM_EFC, EFC_ACCESS_MODE_128, 6);
|
|
}
|
|
|
|
// Erase and write a specific page. It is assumed that the data
|
|
// to write has already been loaded into the latch registers.
|
|
inline void crypto_sam_erase_and_write(unsigned page)
|
|
{
|
|
// Erase the page and write its new contents.
|
|
efc_perform_command(SAM_EFC, EFC_FCMD_EWP, page);
|
|
}
|
|
|
|
// Unlock the memory region containing a page.
|
|
inline void crypto_sam_unlock_page(unsigned page)
|
|
{
|
|
unsigned pagesPerRegion = SAM_FLASH_REGION_SIZE / SAM_FLASH_PAGE_SIZE;
|
|
unsigned region = page - (page % pagesPerRegion);
|
|
efc_perform_command(SAM_EFC, EFC_FCMD_CLB, region);
|
|
}
|
|
|
|
// Lock the memory region containing a page.
|
|
inline void crypto_sam_lock_page(unsigned page)
|
|
{
|
|
unsigned pagesPerRegion = SAM_FLASH_REGION_SIZE / SAM_FLASH_PAGE_SIZE;
|
|
unsigned region = page - (page % pagesPerRegion);
|
|
efc_perform_command(SAM_EFC, EFC_FCMD_SLB, region);
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|