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Split rfft_fast_init_f32 into separate initializer functions.

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The rationale here is that if the caller knows the size FFT they require
at compile time, only the look-up tables required for that size are
placed in the data segment (ROM).  This saves between ~40k to ~80k of
ROM when only using a single FFT size.
pull/19/head
Dave Flogeras 8 years ago committed by Martin Günther
parent da38c27dd0
commit 0f5b33ee1b
2 changed files with 210 additions and 0 deletions
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17
Include/arm_math.h
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@ -2224,6 +2224,23 @@ arm_status arm_rfft_fast_init_f32 (
arm_rfft_fast_instance_f32 * S,
uint16_t fftLen);
arm_status arm_rfft_32_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_64_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_128_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_256_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_512_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_1024_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_2048_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
arm_status arm_rfft_4096_fast_init_f32 ( arm_rfft_fast_instance_f32 * S );
void arm_rfft_fast_f32(
arm_rfft_fast_instance_f32 * S,
float32_t * p, float32_t * pOut,

193
Source/TransformFunctions/arm_rfft_fast_init_f32.c
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@ -38,6 +38,199 @@
* @{
*/
/**
* @brief Initialization function for the 32pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_32_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 16U;
S->fftLenRFFT = 32U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_16_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable16;
Sint->pTwiddle = (float32_t *) twiddleCoef_16;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_32;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 64pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_64_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 32U;
S->fftLenRFFT = 64U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_32_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable32;
Sint->pTwiddle = (float32_t *) twiddleCoef_32;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_64;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 128pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_128_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 64U;
S->fftLenRFFT = 128U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_64_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable64;
Sint->pTwiddle = (float32_t *) twiddleCoef_64;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_128;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 256pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_256_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 128U;
S->fftLenRFFT = 256U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_128_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable128;
Sint->pTwiddle = (float32_t *) twiddleCoef_128;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_256;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 512pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_512_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 256U;
S->fftLenRFFT = 512U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_256_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable256;
Sint->pTwiddle = (float32_t *) twiddleCoef_256;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_512;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 1024pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_1024_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 512U;
S->fftLenRFFT = 1024U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_512_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable512;
Sint->pTwiddle = (float32_t *) twiddleCoef_512;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_1024;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 2048pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_2048_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 1024U;
S->fftLenRFFT = 2048U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_1024_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable1024;
Sint->pTwiddle = (float32_t *) twiddleCoef_1024;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_2048;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the 4096pt floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.
* @return The function returns ARM_MATH_SUCCESS if initialization is successful or ARM_MATH_ARGUMENT_ERROR if an error is detected.
*/
arm_status arm_rfft_4096_fast_init_f32( arm_rfft_fast_instance_f32 * S ) {
arm_cfft_instance_f32 * Sint;
if( !S ) return ARM_MATH_ARGUMENT_ERROR;
Sint = &(S->Sint);
Sint->fftLen = 2048U;
S->fftLenRFFT = 4096U;
Sint->bitRevLength = ARMBITREVINDEXTABLE_2048_TABLE_LENGTH;
Sint->pBitRevTable = (uint16_t *)armBitRevIndexTable2048;
Sint->pTwiddle = (float32_t *) twiddleCoef_2048;
S->pTwiddleRFFT = (float32_t *) twiddleCoef_rfft_4096;
return ARM_MATH_SUCCESS;
}
/**
* @brief Initialization function for the floating-point real FFT.
* @param[in,out] *S points to an arm_rfft_fast_instance_f32 structure.

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