From 86608c6770cf08c138a2bdab5855072f64be09ef Mon Sep 17 00:00:00 2001 From: joshua Date: Sat, 30 Dec 2023 23:54:31 -0500 Subject: initial commit --- .../DSP/Source/SupportFunctions/arm_float_to_q15.c | 244 +++++++++++++++++++++ 1 file changed, 244 insertions(+) create mode 100644 Drivers/CMSIS/DSP/Source/SupportFunctions/arm_float_to_q15.c (limited to 'Drivers/CMSIS/DSP/Source/SupportFunctions/arm_float_to_q15.c') diff --git a/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_float_to_q15.c b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_float_to_q15.c new file mode 100644 index 0000000..a3c8bb2 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_float_to_q15.c @@ -0,0 +1,244 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_float_to_q15.c + * Description: Converts the elements of the floating-point vector to Q15 vector + * + * $Date: 18. March 2019 + * $Revision: V1.6.0 + * + * Target Processor: Cortex-M cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved. + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "arm_math.h" + +/** + @ingroup groupSupport + */ + +/** + @addtogroup float_to_x + @{ + */ + +/** + @brief Converts the elements of the floating-point vector to Q15 vector. + @param[in] pSrc points to the floating-point input vector + @param[out] pDst points to the Q15 output vector + @param[in] blockSize number of samples in each vector + @return none + + @par Details + The equation used for the conversion process is: + 
+      pDst[n] = (q15_t)(pSrc[n] * 32768);   0 <= n < blockSize.
+
+ + @par Scaling and Overflow Behavior + The function uses saturating arithmetic. + Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated. + + @note + In order to apply rounding, the library should be rebuilt with the ROUNDING macro + defined in the preprocessor section of project options. + */ +#if defined(ARM_MATH_NEON_EXPERIMENTAL) +void arm_float_to_q15( + const float32_t * pSrc, + q15_t * pDst, + uint32_t blockSize) +{ + const float32_t *pIn = pSrc; /* Src pointer */ + uint32_t blkCnt; /* loop counter */ + + float32_t in; + float32x4_t inV; + #ifdef ARM_MATH_ROUNDING + float32x4_t zeroV = vdupq_n_f32(0.0f); + float32x4_t pHalf = vdupq_n_f32(0.5f / 32768.0f); + float32x4_t mHalf = vdupq_n_f32(-0.5f / 32768.0f); + float32x4_t r; + uint32x4_t cmp; + #endif + + int32x4_t cvt; + int16x4_t outV; + + blkCnt = blockSize >> 2U; + + /* Compute 4 outputs at a time. + ** a second loop below computes the remaining 1 to 3 samples. */ + while (blkCnt > 0U) + { + +#ifdef ARM_MATH_ROUNDING + /* C = A * 32768 */ + /* Convert from float to q15 and then store the results in the destination buffer */ + inV = vld1q_f32(pIn); + cmp = vcgtq_f32(inV,zeroV); + r = vbslq_f32(cmp,pHalf,mHalf); + inV = vaddq_f32(inV, r); + + pIn += 4; + + cvt = vcvtq_n_s32_f32(inV,15); + outV = vqmovn_s32(cvt); + + vst1_s16(pDst, outV); + pDst += 4; + +#else + + /* C = A * 32768 */ + /* Convert from float to q15 and then store the results in the destination buffer */ + inV = vld1q_f32(pIn); + + cvt = vcvtq_n_s32_f32(inV,15); + outV = vqmovn_s32(cvt); + + vst1_s16(pDst, outV); + pDst += 4; + pIn += 4; + +#endif /* #ifdef ARM_MATH_ROUNDING */ + + /* Decrement the loop counter */ + blkCnt--; + } + + /* If the blockSize is not a multiple of 4, compute any remaining output samples here. + ** No loop unrolling is used. */ + blkCnt = blockSize & 3; + + while (blkCnt > 0U) + { + +#ifdef ARM_MATH_ROUNDING + /* C = A * 32768 */ + /* Convert from float to q15 and then store the results in the destination buffer */ + in = *pIn++; + in = (in * 32768.0f); + in += in > 0.0f ? 0.5f : -0.5f; + *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16)); + +#else + + /* C = A * 32768 */ + /* Convert from float to q15 and then store the results in the destination buffer */ + *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16); + +#endif /* #ifdef ARM_MATH_ROUNDING */ + + /* Decrement the loop counter */ + blkCnt--; + } +} +#else +void arm_float_to_q15( + const float32_t * pSrc, + q15_t * pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counter */ + const float32_t *pIn = pSrc; /* Source pointer */ + +#ifdef ARM_MATH_ROUNDING + float32_t in; +#endif /* #ifdef ARM_MATH_ROUNDING */ + +#if defined (ARM_MATH_LOOPUNROLL) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = A * 32768 */ + + /* convert from float to Q15 and store result in destination buffer */ +#ifdef ARM_MATH_ROUNDING + + in = (*pIn++ * 32768.0f); + in += in > 0.0f ? 0.5f : -0.5f; + *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16)); + + in = (*pIn++ * 32768.0f); + in += in > 0.0f ? 0.5f : -0.5f; + *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16)); + + in = (*pIn++ * 32768.0f); + in += in > 0.0f ? 0.5f : -0.5f; + *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16)); + + in = (*pIn++ * 32768.0f); + in += in > 0.0f ? 0.5f : -0.5f; + *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16)); + +#else + + *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16); + *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16); + *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16); + *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16); + +#endif /* #ifdef ARM_MATH_ROUNDING */ + + /* Decrement loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = blockSize % 0x4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = blockSize; + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* C = A * 32768 */ + + /* convert from float to Q15 and store result in destination buffer */ +#ifdef ARM_MATH_ROUNDING + + in = (*pIn++ * 32768.0f); + in += in > 0.0f ? 0.5f : -0.5f; + *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16)); + +#else + + /* C = A * 32768 */ + /* Convert from float to q15 and then store the results in the destination buffer */ + *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16); + +#endif /* #ifdef ARM_MATH_ROUNDING */ + + /* Decrement loop counter */ + blkCnt--; + } + +} +#endif /* #if defined(ARM_MATH_NEON) */ + +/** + @} end of float_to_x group + */ -- cgit v1.2.3