diff options
Diffstat (limited to 'tool/mbed')
| -rw-r--r-- | tool/mbed/gcc.mk | 2 | ||||
| -rw-r--r-- | tool/mbed/lpc-vector-checksum.c | 99 |
2 files changed, 100 insertions, 1 deletions
diff --git a/tool/mbed/gcc.mk b/tool/mbed/gcc.mk index 0fc41fe275..032f7c6cae 100644 --- a/tool/mbed/gcc.mk +++ b/tool/mbed/gcc.mk @@ -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 diff --git a/tool/mbed/lpc-vector-checksum.c b/tool/mbed/lpc-vector-checksum.c new file mode 100644 index 0000000000..316a1253a0 --- /dev/null +++ b/tool/mbed/lpc-vector-checksum.c @@ -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; +} + |