tmk
10 years ago
2 changed files with 100 additions and 1 deletions
+ 1
- 1
tool/mbed/gcc.mk
View File
| @@ -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
- 0
tool/mbed/lpc-vector-checksum.c
View 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…