diff options
| author | Rafał Miłecki <zajec5@gmail.com> | 2010-01-25 19:00:00 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-01-25 16:39:03 -0500 |
| commit | 6f98e62a9f1bdbd83d8d1be8c2ca6f58099846ef (patch) | |
| tree | cdfabc6feccd4e01b56fbf44bdce3eea25e573f4 /drivers/net/wireless/b43/phy_common.c | |
| parent | 986504540306137dfc90a936f9f25086d15621c5 (diff) | |
b43: update cordic code to match current specs
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/b43/phy_common.c')
| -rw-r--r-- | drivers/net/wireless/b43/phy_common.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/net/wireless/b43/phy_common.c b/drivers/net/wireless/b43/phy_common.c index 446c41bb1e9..8f7d7eff2d8 100644 --- a/drivers/net/wireless/b43/phy_common.c +++ b/drivers/net/wireless/b43/phy_common.c @@ -422,21 +422,28 @@ void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on) b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4); } +/* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */ struct b43_c32 b43_cordic(int theta) { u32 arctg[] = { 2949120, 1740967, 919879, 466945, 234379, 117304, 58666, 29335, 14668, 7334, 3667, 1833, 917, 458, 229, 115, 57, 29, }; - int i, tmp, signx = 1, angle = 0; + u8 i; + s32 tmp; + s8 signx = 1; + u32 angle = 0; struct b43_c32 ret = { .i = 39797, .q = 0, }; - theta = clamp_t(int, theta, -180, 180); + while (theta > (180 << 16)) + theta -= (360 << 16); + while (theta < -(180 << 16)) + theta += (360 << 16); - if (theta > 90) { - theta -= 180; + if (theta > (90 << 16)) { + theta -= (180 << 16); signx = -1; - } else if (theta < -90) { - theta += 180; + } else if (theta < -(90 << 16)) { + theta += (180 << 16); signx = -1; } |