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FMC ADC 100M 14b 4cha
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FMC ADC 100M 14b 4cha
Commits
e9efa126
Commit
e9efa126
authored
Oct 19, 2018
by
Federico Vaga
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drv: isolate DAC offset conversion
Signed-off-by:
Federico Vaga
<
federico.vaga@cern.ch
>
parent
80613102
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1 changed file
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26 additions
and
16 deletions
+26
-16
fa-core.c
kernel/fa-core.c
+26
-16
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kernel/fa-core.c
View file @
e9efa126
...
...
@@ -105,6 +105,30 @@ static int zfad_dac_set(struct zio_channel *chan, uint32_t val)
return
fa_spi_xfer
(
fa
,
FA_SPI_SS_DAC
(
chan
->
index
),
16
,
val
,
NULL
);
}
static
int
zfad_offset_to_dac
(
struct
zio_channel
*
chan
,
int32_t
uval
,
enum
fa100m14b4c_input_range
range
)
{
struct
fa_dev
*
fa
=
get_zfadc
(
&
chan
->
cset
->
zdev
->
head
.
dev
);
int
offset
,
gain
,
hwval
;
hwval
=
uval
*
0x8000
/
5000
;
if
(
hwval
==
0x8000
)
hwval
=
0x7fff
;
/* -32768 .. 32767 */
offset
=
fa
->
calib
.
dac
[
range
].
offset
[
chan
->
index
];
gain
=
fa
->
calib
.
dac
[
range
].
gain
[
chan
->
index
];
hwval
=
((
hwval
+
offset
)
*
gain
)
>>
15
;
/* signed */
hwval
+=
0x8000
;
/* offset binary */
if
(
hwval
<
0
)
hwval
=
0
;
if
(
hwval
>
0xffff
)
hwval
=
0xffff
;
return
hwval
;
}
/*
* zfad_apply_user_offset
* @fa: the fmc-adc descriptor
...
...
@@ -132,24 +156,10 @@ int zfad_apply_user_offset(struct fa_dev *fa, struct zio_channel *chan,
if
(
range
<
0
)
return
range
;
if
(
range
==
FA100M14B4C_RANGE_OPEN
||
fa_enable_test_data_adc
)
{
if
(
range
==
FA100M14B4C_RANGE_OPEN
||
fa_enable_test_data_adc
)
range
=
FA100M14B4C_RANGE_1V
;
}
offset
=
fa
->
calib
.
dac
[
range
].
offset
[
chan
->
index
];
gain
=
fa
->
calib
.
dac
[
range
].
gain
[
chan
->
index
];
hwval
=
uval
*
0x8000
/
5000
;
if
(
hwval
==
0x8000
)
hwval
=
0x7fff
;
/* -32768 .. 32767 */
hwval
=
((
hwval
+
offset
)
*
gain
)
>>
15
;
/* signed */
hwval
+=
0x8000
;
/* offset binary */
if
(
hwval
<
0
)
hwval
=
0
;
if
(
hwval
>
0xffff
)
hwval
=
0xffff
;
hwval
=
zfad_offset_to_dac
(
chan
,
usr_val
,
range
);
return
zfad_dac_set
(
chan
,
hwval
);
}
...
...
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