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ubb-patgen/ubb-patgen.c: new option -i to select frequency by cycle time

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This commit is contained in:
Werner Almesberger 2013-01-16 01:58:16 -03:00
parent c124e1a819
commit 39f4e48f8d
2 changed files with 64 additions and 7 deletions
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8
ubb-patgen/README
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@ -63,6 +63,14 @@ bus clk = 100.962 kHz (+0.96%)
This warning can be suppressed with the option -q.
The frequency can also be specified as the cycle time with the
option -i:
# ubb-patgen -i 10us
The meaning of an appended + or - changes here, e.g., 10us+
selects a slower clock (producing an interval of at least 10 us).
Clock output
------------

63
ubb-patgen/ubb-patgen.c
View File

@ -506,7 +506,7 @@ static int frequency(const char *s, int *hz, int *rel)
}
static int duration(const char *s, struct timespec *res)
static int duration(const char *s, double *res, int *rel)
{
char *end;
double d;
@ -539,12 +539,49 @@ static int duration(const char *s, struct timespec *res)
if (*end == 'S' || *end == 's')
end++;
switch (*end) {
case '+':
*rel = 1;
end++;
break;
case '-':
*rel = -1;
end++;
break;
default:
*rel = 0;
break;
}
if (*end)
return 0;
*res = d;
return 1;
}
static int duration_timespec(const char *s, struct timespec *res, int *rel)
{
double d;
if (!duration(s, &d, rel))
return 0;
res->tv_sec = d;
res->tv_nsec = (d-res->tv_sec)*1e9;
return 1;
}
static int interval(const char *s, int *hz, int *rel)
{
double d;
if (!duration(s, &d, rel))
return 0;
*hz = 1/d;
*rel = -*rel;
return 1;
}
@ -553,12 +590,15 @@ static void usage(const char *name)
{
fprintf(stderr,
"usage: %s\n"
" %s [-q] -f freq_hz\n"
" %s [-q] [-f freq_hz] -c [active_s]\n"
" %s [-q] [-f freq_hz] [-C|-t 0|1] [-m mask] [-p] file|pattern\n\n"
" %s [-q] -f freq_hz|-i interval_s\n"
" %s [-q] [-f freq_hz|-i interval_s] -c [active_s]\n"
" %s [-q] [-f freq_hz|-i interval_s] [-C|-t 0|1] [-m mask] [-p]\n"
" file|pattern\n\n"
" -c output bus clock on CLK without sending a pattern\n"
" -C temporarily output bus clock on CLK (for debugging)\n"
" -f freq_hz set bus clock to the specified frequency (default: 1 MHz)\n"
" -i inter_s set bus clock such that one cycle equals the specified "
"interval\n"
" -m mask use only the DATx lines specified in the mask (default: 0xf)\n"
" -p force interpretation of argument as pattern (and not file)\n"
" -q quiet. Don't pretty-print frequencies; don't report clock\n"
@ -574,7 +614,8 @@ static void usage(const char *name)
" \"+\" selects a frequency >= the specified one, \"-\" one <=.\n"
" Without +/-, the closest available frequency is selected.\n"
"Duration: the duration in seconds, optionally followed by \"m\", \"u\", or\n"
" \"n\", optionally followed by \"s\".\n"
" \"n\", optionally followed by \"s\", optionally followed by \"+\" or \"-\"."
"\n"
"Pattern: hex digits corresponding to 1 for DAT0, 2 for DAT1, etc.\n"
" {n} repeats the preceding digit n times, e.g., 1{3} is equivalent to 111.\n"
, name, name, name, name);
@ -589,6 +630,7 @@ int main(int argc, char **argv)
const char *pattern = NULL;
int quiet = 0, force_pattern = 0;
struct timespec active_ns;
int active_rel = 0;
int keep_clk = 1;
uint8_t mask = 0xf;
int trigger = -1;
@ -596,12 +638,16 @@ int main(int argc, char **argv)
int c;
unsigned long tmp;
while ((c = getopt(argc, argv, "cCf:m:pqt:")) != EOF)
while ((c = getopt(argc, argv, "cCf:i:m:pqt:")) != EOF)
switch (c) {
case 'f':
if (!frequency(optarg, &bus_hz, &bus_rel))
usage(*argv);
break;
case 'i':
if (!interval(optarg, &bus_hz, &bus_rel))
usage(*argv);
break;
case 'c':
clk_only = 1;
break;
@ -664,7 +710,10 @@ int main(int argc, char **argv)
if (clk_only) {
if (force_pattern)
usage(*argv);
if (!duration(argv[optind], &active_ns))
if (!duration_timespec(argv[optind],
&active_ns, &active_rel))
usage(*argv);
if (active_rel < 0)
usage(*argv);
keep_clk = 0;
} else {