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_q31_to_float.c | 159 +++++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_float.c (limited to 'Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_float.c') diff --git a/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_float.c b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_float.c new file mode 100644 index 0000000..8ff9e7b --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/SupportFunctions/arm_q31_to_float.c @@ -0,0 +1,159 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_q31_to_float.c + * Description: Converts the elements of the Q31 vector to floating-point 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 + */ + +/** + * @defgroup q31_to_x Convert 32-bit Integer value + */ + +/** + @addtogroup q31_to_x + @{ + */ + +/** + @brief Converts the elements of the Q31 vector to floating-point vector. + @param[in] pSrc points to the Q31 input vector + @param[out] pDst points to the floating-point 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] = (float32_t) pSrc[n] / 2147483648;   0 <= n < blockSize.
+
+ */ + +#if defined(ARM_MATH_NEON_EXPERIMENTAL) +void arm_q31_to_float( + const q31_t * pSrc, + float32_t * pDst, + uint32_t blockSize) +{ + const q31_t *pIn = pSrc; /* Src pointer */ + uint32_t blkCnt; /* loop counter */ + + int32x4_t inV; + float32x4_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) + { + /* C = (float32_t) A / 2147483648 */ + /* Convert from q31 to float and then store the results in the destination buffer */ + inV = vld1q_s32(pIn); + pIn += 4; + + outV = vcvtq_n_f32_s32(inV,31); + + vst1q_f32(pDst, outV); + pDst += 4; + + /* 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) + { + /* C = (float32_t) A / 2147483648 */ + /* Convert from q31 to float and then store the results in the destination buffer */ + *pDst++ = ((float32_t) * pIn++ / 2147483648.0f); + + /* Decrement the loop counter */ + blkCnt--; + } +} +#else +void arm_q31_to_float( + const q31_t * pSrc, + float32_t * pDst, + uint32_t blockSize) +{ + const q31_t *pIn = pSrc; /* Src pointer */ + uint32_t blkCnt; /* loop counter */ + +#if defined (ARM_MATH_LOOPUNROLL) + + /* Loop unrolling */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = (float32_t) A / 2147483648 */ + + /* Convert from q31 to float and store result in destination buffer */ + *pDst++ = ((float32_t) *pIn++ / 2147483648.0f); + *pDst++ = ((float32_t) *pIn++ / 2147483648.0f); + *pDst++ = ((float32_t) *pIn++ / 2147483648.0f); + *pDst++ = ((float32_t) *pIn++ / 2147483648.0f); + + /* 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 = (float32_t) A / 2147483648 */ + + /* Convert from q31 to float and store result in destination buffer */ + *pDst++ = ((float32_t) *pIn++ / 2147483648.0f); + + /* Decrement loop counter */ + blkCnt--; + } + +} +#endif /* #if defined(ARM_MATH_NEON) */ + +/** + @} end of q31_to_x group + */ -- cgit v1.2.3