diff options
| author | Antti Palosaari <crope@iki.fi> | 2013-08-11 19:07:02 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-08-20 16:08:47 -0300 |
| commit | 0046079812cfcf6c725e067edb683e472d388552 (patch) | |
| tree | 86176f2cab282169837cce23f54dd3afc83a21ec /drivers/staging | |
| parent | 61198dfd08969a662767072aafeebcb493909338 (diff) | |
| download | blackbird-op-linux-0046079812cfcf6c725e067edb683e472d388552.tar.gz blackbird-op-linux-0046079812cfcf6c725e067edb683e472d388552.zip | |
[media] msi3101: change stream format 384
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>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/media/msi3101/sdr-msi3101.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/staging/media/msi3101/sdr-msi3101.c b/drivers/staging/media/msi3101/sdr-msi3101.c index bf735f9b5db9..839e601bd7c4 100644 --- a/drivers/staging/media/msi3101/sdr-msi3101.c +++ b/drivers/staging/media/msi3101/sdr-msi3101.c @@ -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; |
