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[media] msi3101: change stream format 384

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After feeding different signal levels using RF generator and looking
GNU Radio FFT sink I made decision to change bit shift 3 to bit shift
2 as there was very (too) huge visible leap in FFT sink GUI. Now it
looks more natural.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2013-08-11 19:07:02 -03:00 committed by Mauro Carvalho Chehab
parent 61198dfd08
commit 0046079812
1 changed files with 6 additions and 3 deletions
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9
drivers/staging/media/msi3101/sdr-msi3101.c
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@ -589,7 +589,7 @@ static int msi3101_convert_stream_504(struct msi3101_state *s, u32 *dst,
}
/*
* Converts signed ~10+3-bit integer into 32-bit IEEE floating point
* Converts signed ~10+2-bit integer into 32-bit IEEE floating point
* representation.
*/
static u32 msi3101_convert_sample_384(struct msi3101_state *s, u16 x, int shift)
@ -601,12 +601,15 @@ static u32 msi3101_convert_sample_384(struct msi3101_state *s, u16 x, int shift)
if (!x)
return 0;
/* Convert 10-bit two's complement to 13-bit */
if (shift == 3)
shift = 2;
/* Convert 10-bit two's complement to 12-bit */
if (x & (1 << 9)) {
x |= ~0U << 10; /* set all the rest bits to one */
x <<= shift;
x = -x;
x &= 0xfff; /* result is 12 bit ... + sign */
x &= 0x7ff; /* result is 11 bit ... + sign */
sign = 1 << 31;
} else {
x <<= shift;