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flash.c
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flash.c
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/*
* Copyright 2011 Ytai Ben-Tsvi. All rights reserved.
*
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED "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 ARSHAN POURSOHI OR
* CONTRIBUTORS 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.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied.
*/
#include <assert.h>
#include "Compiler.h"
#include "flash.h"
BOOL FlashErasePage(DWORD address) {
assert((address & 0x3FF) == 0);
DWORD_VAL a = { address };
NVMCON = 0x4042; // Erase page
TBLPAG = a.byte.UB;
__builtin_tblwtl(a.word.LW, 0xFFFF);
asm("DISI #5");
__builtin_write_NVM();
while(NVMCONbits.WR);
NVMCONbits.WREN = 0;
return NVMCONbits.WRERR == 0;
}
BOOL FlashWriteDWORD(DWORD address, DWORD value) {
assert((address & 0x1) == 0);
DWORD_VAL a = { address };
DWORD_VAL v = { value };
NVMCON = 0x4003; // Word write
TBLPAG = a.word.HW;
__builtin_tblwtl(a.word.LW, v.word.LW); //Write the low word to the latch
__builtin_tblwth(a.word.LW, v.word.HW); //Write the high word to the latch (8 bits of data + 8 bits of "phantom data")
asm("DISI #5");
__builtin_write_NVM();
while (NVMCONbits.WR);
NVMCONbits.WREN = 0;
return NVMCONbits.WRERR == 0;
}
BOOL FlashWriteBlock(DWORD address, BYTE block[192]) {
assert((address & 0x7F) == 0);
unsigned int i = 0;
DWORD_VAL a = { address };
DWORD_VAL v;
NVMCON = 0x4001; // Block write
TBLPAG = a.word.HW;
while (i < 192) {
v.byte.LB = block[i++];
v.byte.HB = block[i++];
v.byte.UB = block[i++];
__builtin_tblwtl(a.word.LW, v.word.LW); // Write the low word to the latch
__builtin_tblwth(a.word.LW, v.word.HW); // Write the high word to the latch (8 bits of data + 8 bits of "phantom data")
a.word.LW += 2;
}
asm("DISI #5");
__builtin_write_NVM();
while (NVMCONbits.WR);
NVMCONbits.WREN = 0;
return NVMCONbits.WRERR == 0;
}
DWORD FlashReadDWORD(DWORD address) {
DWORD_VAL a = { address };
DWORD_VAL res;
TBLPAG = a.word.HW;
res.word.HW = __builtin_tblrdh(a.word.LW);
res.word.LW = __builtin_tblrdl(a.word.LW);
return res.Val;
}