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@xxxxxx>
---
drivers/staging/media/msi3101/sdr-msi3101.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/media/msi3101/sdr-msi3101.c b/drivers/staging/media/msi3101/sdr-msi3101.c
index bf735f9..839e601 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;
--
1.7.11.7
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