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  /external/speex/libspeex/
kiss_fftr.c 178 spx_word32_t f1kr, f1ki, twr, twi; local
244 twi = SHR32(ADD32(MULT16_16(f2k.i,st->super_twiddles[k].r),MULT16_16(f2k.r,st->super_twiddles[k].i)), 1);
248 freqdata[2*k] = PSHR32(f1ki + twi, 15);
250 freqdata[2*(ncfft-k)] = PSHR32(twi - f1ki, 15);
253 freqdata[2*k] = .5f*(f1ki + twi);
255 freqdata[2*(ncfft-k)] = .5f*(twi - f1ki);
  /external/arduino/libraries/Wire/utility/
twi.c 2 twi.c - TWI/I2C library for Wiring & Arduino
25 #include <compat/twi.h>
35 #include "twi.h"
58 * Desc readys twi pins and sets twi bitrate
68 // activate internal pull-ups for twi
73 // activate internal pull-ups for twi
79 // initialize twi prescaler and bit rate
84 /* twi bit rate formula from atmega128 manual pg 20
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