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//
// srecord - manipulate eprom load files
// Copyright (C) 2012 Peter Miller
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 3 of the License, or (at your
// option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
// for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
//
// From: Hendrik Beijeman <hbeyeman@gmail.com>
// To: pmiller@opensource.org.au
// Subject: Re: patch for srecord 1.59
// Date: Sat, 05 May 2012 06:26:02 +0200 (05/05/12 14:26:02)
//
// I hereby formally assign all copyright to the author of srecord,
// Peter Miller.
//
#include <iostream>
#include <srecord/stm32.h>
//
// This code is mostly copied from the CRC32 implementation. The only
// difference is that the STM32 operates on WORDs whereas the CRC32 is
// byte-oriented. In addition the STM32 uses a different polynomial.
//
#define POLYNOMIAL 0x04C11DB7
srecord::stm32::~stm32()
{
}
srecord::stm32::stm32() :
state(0xFFFFFFFF),
cnt(0)
{
}
srecord::stm32::stm32(const stm32 &arg) :
state(arg.state),
cnt(0)
{
while (cnt < arg.cnt)
{
buf[cnt] = arg.buf[cnt];
++cnt;
}
}
srecord::stm32 &
srecord::stm32::operator=(const stm32 &arg)
{
if (this != &arg)
{
state = arg.state;
cnt = 0;
while (cnt < arg.cnt)
{
buf[cnt] = arg.buf[cnt];
++cnt;
}
}
return *this;
}
//
// The STM32 hardware CRC calculation uses CRC polynomial 0x04C11DB7
// and operates only on words.
//
static unsigned long
stm32_crc(unsigned long crc, unsigned long data)
{
crc ^= data;
for (int j = 0; j < 32; ++j)
{
if (crc & 0x80000000)
crc = (crc << 1) ^ POLYNOMIAL;
else
crc = (crc << 1);
}
return crc;
}
void
srecord::stm32::generator(void)
{
unsigned long data = 0;
for (size_t j = 0; j < wordsize; j++)
data |= (buf[j] << (8 * j));
state = stm32_crc(state, data);
cnt = 0;
}
void
srecord::stm32::next(unsigned char x)
{
buf[cnt++] = x;
if (cnt == wordsize)
generator();
}
void
srecord::stm32::nextbuf(const void *data, size_t nbytes)
{
const unsigned char *dp = (const unsigned char *)data;
while (nbytes > 0)
{
--nbytes;
next(*dp++);
}
}
unsigned long
srecord::stm32::get(void)
const
{
return state;
}
// vim: set ts=8 sw=4 et :
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