From 013e9ccfbe76dc46e8c69ea314950bed83d9a39f Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Thu, 10 Jul 2014 17:18:38 -0700 Subject: altos: Use 32-bits for flight state data (alt/speed/accel) Stores 32-bits for all of the flight parameters. Uses 64-bit intermediates for kalman computation. Signed-off-by: Keith Packard --- src/kernel/ao_microkalman.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'src/kernel/ao_microkalman.c') diff --git a/src/kernel/ao_microkalman.c b/src/kernel/ao_microkalman.c index 0684ea2b..75a29cc4 100644 --- a/src/kernel/ao_microkalman.c +++ b/src/kernel/ao_microkalman.c @@ -22,19 +22,19 @@ #define FIX_BITS 16 -#define to_fix16(x) ((int16_t) ((x) * 65536.0 + 0.5)) -#define to_fix32(x) ((int32_t) ((x) * 65536.0 + 0.5)) +#define to_fix_v(x) ((int16_t) ((x) * 65536.0 + 0.5)) +#define to_fix_k(x) ((int32_t) ((x) * 65536.0 + 0.5)) #define from_fix8(x) ((x) >> 8) #define from_fix(x) ((x) >> 16) -#define fix8_to_fix16(x) ((x) << 8) +#define fix8_to_fix_v(x) ((x) << 8) #define fix16_to_fix8(x) ((x) >> 8) #include /* Basic time step (96ms) */ -#define AO_MK_STEP to_fix16(0.096) +#define AO_MK_STEP to_fix_v(0.096) /* step ** 2 / 2 */ -#define AO_MK_STEP_2_2 to_fix16(0.004608) +#define AO_MK_STEP_2_2 to_fix_v(0.004608) uint32_t ao_k_pa; /* 24.8 fixed point */ int32_t ao_k_pa_speed; /* 16.16 fixed point */ @@ -49,7 +49,7 @@ ao_microkalman_init(void) { ao_pa = pa; ao_k_pa = pa << 8; -} +} void ao_microkalman_predict(void) -- cgit v1.2.3