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Commit 00460798 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[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: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 61198dfd

drivers/staging/media/msi3101/sdr-msi3101.c

+6 −3
Original line number Diff line number Diff line
@@ -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;