diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q15.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q15.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q15.c b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q15.c new file mode 100644 index 0000000..a47dd02 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/TransformFunctions/arm_cfft_q15.c @@ -0,0 +1,332 @@ +/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_cfft_q15.c
+ * Description: Combined Radix Decimation in Q15 Frequency CFFT processing function
+ *
+ * $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"
+
+extern void arm_radix4_butterfly_q15(
+ q15_t * pSrc,
+ uint32_t fftLen,
+ const q15_t * pCoef,
+ uint32_t twidCoefModifier);
+
+extern void arm_radix4_butterfly_inverse_q15(
+ q15_t * pSrc,
+ uint32_t fftLen,
+ const q15_t * pCoef,
+ uint32_t twidCoefModifier);
+
+extern void arm_bitreversal_16(
+ uint16_t * pSrc,
+ const uint16_t bitRevLen,
+ const uint16_t * pBitRevTable);
+
+void arm_cfft_radix4by2_q15(
+ q15_t * pSrc,
+ uint32_t fftLen,
+ const q15_t * pCoef);
+
+void arm_cfft_radix4by2_inverse_q15(
+ q15_t * pSrc,
+ uint32_t fftLen,
+ const q15_t * pCoef);
+
+/**
+ @ingroup groupTransforms
+ */
+
+/**
+ @addtogroup ComplexFFT
+ @{
+ */
+
+/**
+ @brief Processing function for Q15 complex FFT.
+ @param[in] S points to an instance of Q15 CFFT structure
+ @param[in,out] p1 points to the complex data buffer of size <code>2*fftLen</code>. Processing occurs in-place
+ @param[in] ifftFlag flag that selects transform direction
+ - value = 0: forward transform
+ - value = 1: inverse transform
+ @param[in] bitReverseFlag flag that enables / disables bit reversal of output
+ - value = 0: disables bit reversal of output
+ - value = 1: enables bit reversal of output
+ @return none
+ */
+
+void arm_cfft_q15(
+ const arm_cfft_instance_q15 * S,
+ q15_t * p1,
+ uint8_t ifftFlag,
+ uint8_t bitReverseFlag)
+{
+ uint32_t L = S->fftLen;
+
+ if (ifftFlag == 1U)
+ {
+ switch (L)
+ {
+ case 16:
+ case 64:
+ case 256:
+ case 1024:
+ case 4096:
+ arm_radix4_butterfly_inverse_q15 ( p1, L, (q15_t*)S->pTwiddle, 1 );
+ break;
+
+ case 32:
+ case 128:
+ case 512:
+ case 2048:
+ arm_cfft_radix4by2_inverse_q15 ( p1, L, S->pTwiddle );
+ break;
+ }
+ }
+ else
+ {
+ switch (L)
+ {
+ case 16:
+ case 64:
+ case 256:
+ case 1024:
+ case 4096:
+ arm_radix4_butterfly_q15 ( p1, L, (q15_t*)S->pTwiddle, 1 );
+ break;
+
+ case 32:
+ case 128:
+ case 512:
+ case 2048:
+ arm_cfft_radix4by2_q15 ( p1, L, S->pTwiddle );
+ break;
+ }
+ }
+
+ if ( bitReverseFlag )
+ arm_bitreversal_16 ((uint16_t*) p1, S->bitRevLength, S->pBitRevTable);
+}
+
+/**
+ @} end of ComplexFFT group
+ */
+
+void arm_cfft_radix4by2_q15(
+ q15_t * pSrc,
+ uint32_t fftLen,
+ const q15_t * pCoef)
+{
+ uint32_t i;
+ uint32_t n2;
+ q15_t p0, p1, p2, p3;
+#if defined (ARM_MATH_DSP)
+ q31_t T, S, R;
+ q31_t coeff, out1, out2;
+ const q15_t *pC = pCoef;
+ q15_t *pSi = pSrc;
+ q15_t *pSl = pSrc + fftLen;
+#else
+ uint32_t l;
+ q15_t xt, yt, cosVal, sinVal;
+#endif
+
+ n2 = fftLen >> 1U;
+
+#if defined (ARM_MATH_DSP)
+
+ for (i = n2; i > 0; i--)
+ {
+ coeff = read_q15x2_ia ((q15_t **) &pC);
+
+ T = read_q15x2 (pSi);
+ T = __SHADD16(T, 0); /* this is just a SIMD arithmetic shift right by 1 */
+
+ S = read_q15x2 (pSl);
+ S = __SHADD16(S, 0); /* this is just a SIMD arithmetic shift right by 1 */
+
+ R = __QSUB16(T, S);
+
+ write_q15x2_ia (&pSi, __SHADD16(T, S));
+
+#ifndef ARM_MATH_BIG_ENDIAN
+ out1 = __SMUAD(coeff, R) >> 16U;
+ out2 = __SMUSDX(coeff, R);
+#else
+ out1 = __SMUSDX(R, coeff) >> 16U;
+ out2 = __SMUAD(coeff, R);
+#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
+
+ write_q15x2_ia (&pSl, (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF));
+ }
+
+#else /* #if defined (ARM_MATH_DSP) */
+
+ for (i = 0; i < n2; i++)
+ {
+ cosVal = pCoef[2 * i];
+ sinVal = pCoef[2 * i + 1];
+
+ l = i + n2;
+
+ xt = (pSrc[2 * i] >> 1U) - (pSrc[2 * l] >> 1U);
+ pSrc[2 * i] = ((pSrc[2 * i] >> 1U) + (pSrc[2 * l] >> 1U)) >> 1U;
+
+ yt = (pSrc[2 * i + 1] >> 1U) - (pSrc[2 * l + 1] >> 1U);
+ pSrc[2 * i + 1] = ((pSrc[2 * l + 1] >> 1U) + (pSrc[2 * i + 1] >> 1U)) >> 1U;
+
+ pSrc[2 * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16U)) +
+ ((int16_t) (((q31_t) yt * sinVal) >> 16U)) );
+
+ pSrc[2 * l + 1] = (((int16_t) (((q31_t) yt * cosVal) >> 16U)) -
+ ((int16_t) (((q31_t) xt * sinVal) >> 16U)) );
+ }
+
+#endif /* #if defined (ARM_MATH_DSP) */
+
+ /* first col */
+ arm_radix4_butterfly_q15( pSrc, n2, (q15_t*)pCoef, 2U);
+
+ /* second col */
+ arm_radix4_butterfly_q15( pSrc + fftLen, n2, (q15_t*)pCoef, 2U);
+
+ n2 = fftLen >> 1U;
+ for (i = 0; i < n2; i++)
+ {
+ p0 = pSrc[4 * i + 0];
+ p1 = pSrc[4 * i + 1];
+ p2 = pSrc[4 * i + 2];
+ p3 = pSrc[4 * i + 3];
+
+ p0 <<= 1U;
+ p1 <<= 1U;
+ p2 <<= 1U;
+ p3 <<= 1U;
+
+ pSrc[4 * i + 0] = p0;
+ pSrc[4 * i + 1] = p1;
+ pSrc[4 * i + 2] = p2;
+ pSrc[4 * i + 3] = p3;
+ }
+
+}
+
+void arm_cfft_radix4by2_inverse_q15(
+ q15_t * pSrc,
+ uint32_t fftLen,
+ const q15_t * pCoef)
+{
+ uint32_t i;
+ uint32_t n2;
+ q15_t p0, p1, p2, p3;
+#if defined (ARM_MATH_DSP)
+ q31_t T, S, R;
+ q31_t coeff, out1, out2;
+ const q15_t *pC = pCoef;
+ q15_t *pSi = pSrc;
+ q15_t *pSl = pSrc + fftLen;
+#else
+ uint32_t l;
+ q15_t xt, yt, cosVal, sinVal;
+#endif
+
+ n2 = fftLen >> 1U;
+
+#if defined (ARM_MATH_DSP)
+
+ for (i = n2; i > 0; i--)
+ {
+ coeff = read_q15x2_ia ((q15_t **) &pC);
+
+ T = read_q15x2 (pSi);
+ T = __SHADD16(T, 0); /* this is just a SIMD arithmetic shift right by 1 */
+
+ S = read_q15x2 (pSl);
+ S = __SHADD16(S, 0); /* this is just a SIMD arithmetic shift right by 1 */
+
+ R = __QSUB16(T, S);
+
+ write_q15x2_ia (&pSi, __SHADD16(T, S));
+
+#ifndef ARM_MATH_BIG_ENDIAN
+ out1 = __SMUSD(coeff, R) >> 16U;
+ out2 = __SMUADX(coeff, R);
+#else
+ out1 = __SMUADX(R, coeff) >> 16U;
+ out2 = __SMUSD(__QSUB(0, coeff), R);
+#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
+
+ write_q15x2_ia (&pSl, (q31_t) ((out2) & 0xFFFF0000) | (out1 & 0x0000FFFF));
+ }
+
+#else /* #if defined (ARM_MATH_DSP) */
+
+ for (i = 0; i < n2; i++)
+ {
+ cosVal = pCoef[2 * i];
+ sinVal = pCoef[2 * i + 1];
+
+ l = i + n2;
+
+ xt = (pSrc[2 * i] >> 1U) - (pSrc[2 * l] >> 1U);
+ pSrc[2 * i] = ((pSrc[2 * i] >> 1U) + (pSrc[2 * l] >> 1U)) >> 1U;
+
+ yt = (pSrc[2 * i + 1] >> 1U) - (pSrc[2 * l + 1] >> 1U);
+ pSrc[2 * i + 1] = ((pSrc[2 * l + 1] >> 1U) + (pSrc[2 * i + 1] >> 1U)) >> 1U;
+
+ pSrc[2 * l] = (((int16_t) (((q31_t) xt * cosVal) >> 16U)) -
+ ((int16_t) (((q31_t) yt * sinVal) >> 16U)) );
+
+ pSrc[2 * l + 1] = (((int16_t) (((q31_t) yt * cosVal) >> 16U)) +
+ ((int16_t) (((q31_t) xt * sinVal) >> 16U)) );
+ }
+
+#endif /* #if defined (ARM_MATH_DSP) */
+
+ /* first col */
+ arm_radix4_butterfly_inverse_q15( pSrc, n2, (q15_t*)pCoef, 2U);
+
+ /* second col */
+ arm_radix4_butterfly_inverse_q15( pSrc + fftLen, n2, (q15_t*)pCoef, 2U);
+
+ n2 = fftLen >> 1U;
+ for (i = 0; i < n2; i++)
+ {
+ p0 = pSrc[4 * i + 0];
+ p1 = pSrc[4 * i + 1];
+ p2 = pSrc[4 * i + 2];
+ p3 = pSrc[4 * i + 3];
+
+ p0 <<= 1U;
+ p1 <<= 1U;
+ p2 <<= 1U;
+ p3 <<= 1U;
+
+ pSrc[4 * i + 0] = p0;
+ pSrc[4 * i + 1] = p1;
+ pSrc[4 * i + 2] = p2;
+ pSrc[4 * i + 3] = p3;
+ }
+}
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