mirror of
https://github.com/openstenoproject/qmk
synced 2024-11-23 08:54:38 +00:00
Add checksum tool for NXP LPC
This commit is contained in:
parent
b4a91ecf4e
commit
a9f5f201ad
2 changed files with 100 additions and 1 deletions
|
@ -7,7 +7,7 @@ LD = $(GCC_BIN)arm-none-eabi-gcc
|
|||
OBJCOPY = $(GCC_BIN)arm-none-eabi-objcopy
|
||||
OBJDUMP = $(GCC_BIN)arm-none-eabi-objdump
|
||||
SIZE = $(GCC_BIN)arm-none-eabi-size
|
||||
CHKSUM = ~/Dropbox/MBED/tool/lpc-vector-checksum
|
||||
CHKSUM = $(TMK_DIR)/tool/mbed/lpc-vector-checksum
|
||||
|
||||
CPU = -mcpu=cortex-m0 -mthumb
|
||||
|
||||
|
|
99
tool/mbed/lpc-vector-checksum.c
Normal file
99
tool/mbed/lpc-vector-checksum.c
Normal file
|
@ -0,0 +1,99 @@
|
|||
/***************************************************************************
|
||||
* https://github.com/dhylands/projects/blob/master/lpc/lpc-vector-checksum/lpc-vector-checksum.c
|
||||
*
|
||||
* Copyright (c) 2012 by Dave Hylands
|
||||
* All Rights Reserved
|
||||
*
|
||||
* Permission is granted to any individual or institution to use, copy,
|
||||
* modify, or redistribute this file so long as it is not sold for profit,
|
||||
* and that this copyright notice is retained.
|
||||
*
|
||||
***************************************************************************
|
||||
*
|
||||
* This program calculates the vector checksum used in LPC17xx binary
|
||||
* images.
|
||||
*
|
||||
* Usage: lpc-vector-checksum file
|
||||
*
|
||||
***************************************************************************/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdint.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
|
||||
/***************************************************************************/
|
||||
/**
|
||||
* update_vector_checksum
|
||||
*
|
||||
* The algorithim is to write the checksum such that the checksum of the
|
||||
* first 8 words is equal to zero.
|
||||
*
|
||||
* The LPC1768 uses little-endian, and this particular routine assumes
|
||||
* that it's running on a little-endian architecture.
|
||||
*/
|
||||
static int update_vector_checksum( const char *filename )
|
||||
{
|
||||
uint32_t sum;
|
||||
uint32_t header[8];
|
||||
FILE *fs;
|
||||
int i;
|
||||
|
||||
if (( fs = fopen( filename, "r+b" )) == NULL )
|
||||
{
|
||||
fprintf( stderr, "Unable to open '%s' for reading/writing (%d): %s\n",
|
||||
filename, errno, strerror( errno ));
|
||||
return 0;
|
||||
}
|
||||
|
||||
if ( fread( header, sizeof( header ), 1, fs ) != 1 )
|
||||
{
|
||||
fprintf( stderr, "Failed to read header from '%s' (perhaps the file is too small?)",
|
||||
filename );
|
||||
fclose( fs );
|
||||
return 0;
|
||||
}
|
||||
|
||||
sum = 0;
|
||||
for ( i = 0; i < 7; i++ )
|
||||
{
|
||||
sum += header[i];
|
||||
}
|
||||
printf( "sum = 0x%08x, value to write = 0x%08x\n", sum, -sum );
|
||||
|
||||
/* write back the checksum to location 7
|
||||
* http://sigalrm.blogspot.jp/2011/10/cortex-m3-exception-vector-checksum.html
|
||||
*/
|
||||
fseek(fs, 0x1c, SEEK_SET);
|
||||
sum = -sum;
|
||||
fwrite(&sum, 4, 1, fs);
|
||||
|
||||
fclose( fs );
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/***************************************************************************/
|
||||
/**
|
||||
* main
|
||||
*/
|
||||
int main( int argc, char **argv )
|
||||
{
|
||||
int arg;
|
||||
|
||||
if ( argc < 2)
|
||||
{
|
||||
fprintf( stderr, "Usage: lpc-vector-checksum file ...\n" );
|
||||
exit( 1 );
|
||||
}
|
||||
|
||||
for ( arg = 1; arg < argc; arg++ )
|
||||
{
|
||||
update_vector_checksum( argv[ arg ]);
|
||||
}
|
||||
|
||||
exit( 0 );
|
||||
return 0;
|
||||
}
|
||||
|
Loading…
Reference in a new issue