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Software for White Rabbit PTP Core
Commits
6ffd84cd
Commit
6ffd84cd
authored
Jul 17, 2014
by
Tomasz Wlostowski
Committed by
Grzegorz Daniluk
Aug 05, 2014
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Plain Diff
shell: added VCO characterization command (pll checkvco)
parent
f0953590
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46 additions
and
1 deletion
+46
-1
cmd_pll.c
shell/cmd_pll.c
+46
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shell/cmd_pll.c
View file @
6ffd84cd
...
...
@@ -14,6 +14,49 @@
#include "softpll_ng.h"
#include "shell.h"
static
int
calc_apr
(
int
meas_min
,
int
meas_max
,
int
f_center
)
{
// apr_min is in PPM
int64_t
delta_low
=
meas_min
-
f_center
;
int64_t
delta_hi
=
meas_max
-
f_center
;
if
(
delta_low
>=
0
)
return
-
1
;
if
(
delta_hi
<=
0
)
return
-
1
;
int
ppm_lo
=
-
(
int64_t
)
delta_low
*
1000000LL
/
f_center
;
int
ppm_hi
=
(
int64_t
)
delta_hi
*
1000000LL
/
f_center
;
return
ppm_lo
<
ppm_hi
?
ppm_lo
:
ppm_hi
;
}
extern
void
disable_irq
();
static
void
check_vco_frequencies
()
{
disable_irq
();
int
f_min
,
f_max
;
pp_printf
(
"SoftPLL VCO Frequency/APR test:
\n
"
);
spll_set_dac
(
-
1
,
0
);
f_min
=
spll_measure_frequency
(
SPLL_OSC_DMTD
);
spll_set_dac
(
-
1
,
65535
);
f_max
=
spll_measure_frequency
(
SPLL_OSC_DMTD
);
pp_printf
(
"DMTD VCO: Low=%d Hz Hi=%d Hz, APR = %d ppm.
\n
"
,
f_min
,
f_max
,
calc_apr
(
f_min
,
f_max
,
62500000
));
spll_set_dac
(
0
,
0
);
f_min
=
spll_measure_frequency
(
SPLL_OSC_REF
);
spll_set_dac
(
0
,
65535
);
f_max
=
spll_measure_frequency
(
SPLL_OSC_REF
);
pp_printf
(
"REF VCO: Low=%d Hz Hi=%d Hz, APR = %d ppm.
\n
"
,
f_min
,
f_max
,
calc_apr
(
f_min
,
f_max
,
125000000
));
f_min
=
spll_measure_frequency
(
SPLL_OSC_EXT
);
pp_printf
(
"EXT clock: Freq=%d Hz
\n
"
,
f_min
);
}
static
int
cmd_pll
(
const
char
*
args
[])
{
int
cur
,
tgt
;
...
...
@@ -53,7 +96,9 @@ static int cmd_pll(const char *args[])
if
(
!
args
[
1
])
return
-
EINVAL
;
mprintf
(
"%d
\n
"
,
spll_get_dac
(
atoi
(
args
[
1
])));
}
else
}
else
if
(
!
strcasecmp
(
args
[
0
],
"checkvco"
))
check_vco_frequencies
();
else
return
-
EINVAL
;
return
0
;
...
...
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