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ubb-patgen/ubb-patgen.c: move frequency difference warning into select_freq

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This way, all frequency selections print a warning when there's a difference.
This commit is contained in:
Werner Almesberger 2013-01-15 23:48:57 -03:00
parent ff38f1c249
commit 9930ae6576
2 changed files with 26 additions and 22 deletions
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16
ubb-patgen/README
View File

@ -55,6 +55,14 @@ frequencies that don't exceed the specified value. Examples:
Note that this form of invocation only searches the frequency
table but does not produce any output on UBB.
ubb-patgen warns if the selected frequency does not match the
requested frequency, e.g.,
# ubb-patgen -f 100kHz
bus clk = 100.962 kHz (+0.96%)
This warning can be suppressed with the option -q.
Clock output
------------
@ -73,14 +81,6 @@ To stop the MMC bus clock, run
# ubb-patgen -c 0
ubb-patgen warns if the selected frequency does not match the
requested frequency, e.g.,
# ubb-patgen -f 100kHz -c
bus clk = 100.962 kHz (+0.96%)
This warning can be suppressed with the option -q.
Pattern output
--------------

32
ubb-patgen/ubb-patgen.c
View File

@ -112,11 +112,12 @@ static void show_frequencies(int quiet)
}
static int select_freq(struct mmcclk *res, int hz, int rel)
static int select_freq(struct mmcclk *res, int hz, int rel, int quiet)
{
const struct mmcclk *clks, *p, *best = NULL;
double d, best_d = 0;
int n;
double err;
clks = frequencies(&n);
for (p = clks; p != clks+n; p++) {
@ -134,6 +135,20 @@ static int select_freq(struct mmcclk *res, int hz, int rel)
return 0;
*res = *best;
free((void *) clks);
if (quiet)
return 1;
if (res->bus_clk_hz != hz) {
fprintf(stderr, "bus clk = ");
print_freq(stderr, res->bus_clk_hz);
err = (res->bus_clk_hz-hz)/hz;
if (err <= -0.0001 || err >= 0.0001)
fprintf(stderr, " (%+.2g%%)\n", err*100);
else
fprintf(stderr, " (%+d ppm)\n", (int) (err*1000000));
}
return 1;
}
@ -588,7 +603,7 @@ int main(int argc, char **argv)
ubb_open(UBB_ALL);
if (bus_hz) {
if (!select_freq(&clk, bus_hz, bus_rel)) {
if (!select_freq(&clk, bus_hz, bus_rel, quiet)) {
fprintf(stderr,
"no suitable frequency found\n");
exit(1);
@ -626,21 +641,10 @@ int main(int argc, char **argv)
if (!bus_hz)
bus_hz = 1000000;
if (!select_freq(&clk, bus_hz, bus_rel)) {
if (!select_freq(&clk, bus_hz, bus_rel, quiet)) {
fprintf(stderr, "no suitable frequency found\n");
exit(1);
}
if (clk.bus_clk_hz != bus_hz && !quiet) {
double err;
fprintf(stderr, "bus clk = ");
print_freq(stderr, clk.bus_clk_hz);
err = (clk.bus_clk_hz-bus_hz)/bus_hz;
if (err <= -0.0001 || err >= 0.0001)
fprintf(stderr, " (%+.2g%%)\n", err*100);
else
fprintf(stderr, " (%+d ppm)\n", (int) (err*1000000));
}
if (clkout || clk_only)
PDFUNS = UBB_CLK;