Hi Paul,
On 07/07/2011 10:55 PM, Eloy Paris wrote:
[...]
> After your explanations I am accomplishing what I need like this (for
> example):
>
> shell$ owread --hex --size=16 --start=0 /99.010203040506/generic/memory
This had me scratching my head -- I was reading from microcontroller
memory, using owshell's owread, the following 7 bytes:
0x63, 0x00, 0x4C, 0x08, 0x6C, 0x08, and 0xAC
However, the output from owread --hex was:
63004C086C08FFFFFFAC
There were obviously some mysterious bytes in there, but after realizing
that the last byte has its most significant bit set, and realizing that
the extra bytes are 0xff, it was obvious that there was an unintended
integer conversion from a small size to a larger size (signed char to
integer).
Below you'll find the patch that fixed the problem for me. We could
change the type of the argument of the function (from char to unsigned
char) instead of using a cast, but that probably would require changes
to other places inside ow_server.c (function prototype, add casts to
arguments when the function is called, or change the type of arguments
being passed to the function) so I thought casting in one place would be
easier.
Cheers,
Eloy Paris.-
---------------------------------------------------------------
--- module/owshell/src/c/ow_server.c.orig 2011-07-07 23:23:53.568305295
-0400
+++ module/owshell/src/c/ow_server.c 2011-07-07 23:30:03.824315008 -0400
@@ -367,6 +367,6 @@
{
int i ;
for ( i=0 ; i<length ; ++i ) {
- printf("%.2X",buffer[i]);
+ printf("%.2X", (unsigned char) buffer[i]);
}
}
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