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* main.c, stk500v2.c: Added patch 4804 from eolson@mit.edu

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Which stops sck from being writtend needlessly


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@568 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
c_oflynn
2006-01-17 21:11:39 +00:00
parent 7cc29c373c
commit c1bd17edb2
3 changed files with 27 additions and 3 deletions
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25
stk500v2.c
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@@ -508,6 +508,11 @@ static int stk500v2_open(PROGRAMMER * pgm, char * port)
stk500v2_drain(pgm, 0);
if (pgm->bitclock != 0.0) {
if (pgm->set_sck_period(pgm, pgm->bitclock) != 0)
return -1;
}
return 0;
}
@@ -940,8 +945,7 @@ static int stk500v2_getparm(PROGRAMMER * pgm, unsigned char parm, unsigned char
return 0;
}
static int stk500v2_setparm(PROGRAMMER * pgm, unsigned char parm, unsigned char value)
static int stk500v2_setparm_real(PROGRAMMER * pgm, unsigned char parm, unsigned char value)
{
unsigned char buf[32];
@@ -958,6 +962,23 @@ static int stk500v2_setparm(PROGRAMMER * pgm, unsigned char parm, unsigned char
return 0;
}
static int stk500v2_setparm(PROGRAMMER * pgm, unsigned char parm, unsigned char value)
{
unsigned char current_value;
int res;
res = stk500v2_getparm(pgm, parm, &current_value);
if (res < 0)
fprintf(stderr, "%s: Unable to get parameter 0x%02x\n", progname, parm);
// don't issue a write if the correct value is already set.
if (value == current_value) {
fprintf(stderr, "%s: Skipping paramter write; parameter value already set.\n", progname);
return 0;
}
return stk500v2_setparm_real(pgm, parm, value);
}
static void stk500v2_display(PROGRAMMER * pgm, char * p)
{