66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2014-2016 IBM Corporation.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of the <organization> nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "hw.h"
|
|
#include "lmic.h"
|
|
|
|
// write 32-bit word to EEPROM memory
|
|
void eeprom_write (u4_t* addr, u4_t val) {
|
|
// check previous value
|
|
if( *addr != val ) {
|
|
// unlock data eeprom memory and registers
|
|
FLASH->PEKEYR = 0x89ABCDEF; // FLASH_PEKEY1
|
|
FLASH->PEKEYR = 0x02030405; // FLASH_PEKEY2
|
|
|
|
// only auto-erase if neccessary (when content is non-zero)
|
|
FLASH->PECR &= ~FLASH_PECR_FTDW; // clear FTDW
|
|
|
|
// write value
|
|
*addr = val;
|
|
|
|
// check for end of programming
|
|
while(FLASH->SR & FLASH_SR_BSY); // loop while busy
|
|
|
|
// lock data eeprom memory and registers
|
|
FLASH->PECR |= FLASH_PECR_PELOCK;
|
|
|
|
// verify value
|
|
while( *(volatile u4_t*)addr != val ); // halt on mismatch
|
|
}
|
|
}
|
|
|
|
void eeprom_copy (void* dst, const void* src, u2_t len) {
|
|
while(((u4_t)dst & 3) || ((u4_t)src & 3) || (len & 3)); // halt if not multiples of 4
|
|
u4_t* d = (u4_t*)dst;
|
|
u4_t* s = (u4_t*)src;
|
|
u2_t l = len/4;
|
|
|
|
while(l--) {
|
|
eeprom_write(d++, *s++);
|
|
}
|
|
}
|