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author | Lars-Dominik Braun <lars@6xq.net> | 2015-02-10 12:33:58 +0100 |
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committer | Lars-Dominik Braun <lars@6xq.net> | 2015-02-10 12:33:58 +0100 |
commit | 92ec11b505a5b68c33e6158dbc68cea1d23cbd35 (patch) | |
tree | 737a0ac5a0574388d515ae15923e104c5b0e10f2 /accel.c | |
parent | 708e9eb417ddf41ec345f2be70c4a32721608e4c (diff) | |
download | hourglass-92ec11b505a5b68c33e6158dbc68cea1d23cbd35.tar.gz hourglass-92ec11b505a5b68c33e6158dbc68cea1d23cbd35.tar.bz2 hourglass-92ec11b505a5b68c33e6158dbc68cea1d23cbd35.zip |
Reduce CPU frequency
Also reduces PWM frequency. The speakers resonance frequency is 2kHz, with 1MHz
clock speed and prescaler 256 we get pretty close.
Diffstat (limited to 'accel.c')
-rw-r--r-- | accel.c | 28 |
1 files changed, 13 insertions, 15 deletions
@@ -163,22 +163,20 @@ bool accelProcess () { if (reading && shouldWakeup (WAKE_I2C)) { disableWakeup (WAKE_I2C); reading = false; - if (twr.status == TWST_OK) { - accelProcessHorizon (); - - /* calculate normalized z (i.e. without earth gravity component) */ - if (horizonSign == HORIZON_NEG) { - zvalnormal = zval - (-ACCEL_1G); - } else if (horizonSign == HORIZON_POS) { - zvalnormal = zval - ACCEL_1G; - } - - accelProcessShake (); - /* new data transfered */ - return true; - } else if (twr.status == TWST_ERR) { - assert (0); + /* the bus might be in use again already */ + //assert (twr.status == TWST_OK); + accelProcessHorizon (); + + /* calculate normalized z (i.e. without earth gravity component) */ + if (horizonSign == HORIZON_NEG) { + zvalnormal = zval - (-ACCEL_1G); + } else if (horizonSign == HORIZON_POS) { + zvalnormal = zval - ACCEL_1G; } + + accelProcessShake (); + /* new data transfered */ + return true; } else { if (shouldWakeup (WAKE_ACCEL) && twr.status == TWST_OK) { /* new data available in device buffer and bus is free */ |