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author | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
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committer | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
commit | 4447282260be0780eb6e36f5e953bf56888a5688 (patch) | |
tree | 3ba1e976d998d433397343b79a0612af52075aef /apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c | |
parent | 659543f852d18197f68fafee5db5671567b74f4b (diff) | |
download | px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.gz px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.bz2 px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.zip |
Integrate the interesting parts of the CMSIS 3.01 (r3p1) DSP library
Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c b/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c new file mode 100644 index 000000000..2ec9ee862 --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_cmplx_f32.c @@ -0,0 +1,199 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_cmplx_mult_cmplx_f32.c
+*
+* Description: Floating-point complex-by-complex multiplication
+*
+* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
+*
+* Version 1.1.0 2012/02/15
+* Updated with more optimizations, bug fixes and minor API changes.
+*
+* Version 1.0.10 2011/7/15
+* Big Endian support added and Merged M0 and M3/M4 Source code.
+*
+* Version 1.0.3 2010/11/29
+* Re-organized the CMSIS folders and updated documentation.
+*
+* Version 1.0.2 2010/11/11
+* Documentation updated.
+*
+* Version 1.0.1 2010/10/05
+* Production release and review comments incorporated.
+*
+* Version 1.0.0 2010/09/20
+* Production release and review comments incorporated.
+* -------------------------------------------------------------------- */
+#include "arm_math.h"
+
+/**
+ * @ingroup groupCmplxMath
+ */
+
+/**
+ * @defgroup CmplxByCmplxMult Complex-by-Complex Multiplication
+ *
+ * Multiplies a complex vector by another complex vector and generates a complex result.
+ * The data in the complex arrays is stored in an interleaved fashion
+ * (real, imag, real, imag, ...).
+ * The parameter <code>numSamples</code> represents the number of complex
+ * samples processed. The complex arrays have a total of <code>2*numSamples</code>
+ * real values.
+ *
+ * The underlying algorithm is used:
+ *
+ * <pre>
+ * for(n=0; n<numSamples; n++) {
+ * pDst[(2*n)+0] = pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
+ * pDst[(2*n)+1] = pSrcA[(2*n)+0] * pSrcB[(2*n)+1] + pSrcA[(2*n)+1] * pSrcB[(2*n)+0];
+ * }
+ * </pre>
+ *
+ * There are separate functions for floating-point, Q15, and Q31 data types.
+ */
+
+/**
+ * @addtogroup CmplxByCmplxMult
+ * @{
+ */
+
+
+/**
+ * @brief Floating-point complex-by-complex multiplication
+ * @param[in] *pSrcA points to the first input vector
+ * @param[in] *pSrcB points to the second input vector
+ * @param[out] *pDst points to the output vector
+ * @param[in] numSamples number of complex samples in each vector
+ * @return none.
+ */
+
+void arm_cmplx_mult_cmplx_f32(
+ float32_t * pSrcA,
+ float32_t * pSrcB,
+ float32_t * pDst,
+ uint32_t numSamples)
+{
+ float32_t a1, b1, c1, d1; /* Temporary variables to store real and imaginary values */
+ uint32_t blkCnt; /* loop counters */
+
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+ float32_t a2, b2, c2, d2; /* Temporary variables to store real and imaginary values */
+ float32_t acc1, acc2, acc3, acc4;
+
+
+ /* loop Unrolling */
+ blkCnt = numSamples >> 2u;
+
+ /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
+ ** a second loop below computes the remaining 1 to 3 samples. */
+ while(blkCnt > 0u)
+ {
+ /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
+ /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
+ a1 = *pSrcA; /* A[2 * i] */
+ c1 = *pSrcB; /* B[2 * i] */
+
+ b1 = *(pSrcA + 1); /* A[2 * i + 1] */
+ acc1 = a1 * c1; /* acc1 = A[2 * i] * B[2 * i] */
+
+ a2 = *(pSrcA + 2); /* A[2 * i + 2] */
+ acc2 = (b1 * c1); /* acc2 = A[2 * i + 1] * B[2 * i] */
+
+ d1 = *(pSrcB + 1); /* B[2 * i + 1] */
+ c2 = *(pSrcB + 2); /* B[2 * i + 2] */
+ acc1 -= b1 * d1; /* acc1 = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1] */
+
+ d2 = *(pSrcB + 3); /* B[2 * i + 3] */
+ acc3 = a2 * c2; /* acc3 = A[2 * i + 2] * B[2 * i + 2] */
+
+ b2 = *(pSrcA + 3); /* A[2 * i + 3] */
+ acc2 += (a1 * d1); /* acc2 = A[2 * i + 1] * B[2 * i] + A[2 * i] * B[2 * i + 1] */
+
+ a1 = *(pSrcA + 4); /* A[2 * i + 4] */
+ acc4 = (a2 * d2); /* acc4 = A[2 * i + 2] * B[2 * i + 3] */
+
+ c1 = *(pSrcB + 4); /* B[2 * i + 4] */
+ acc3 -= (b2 * d2); /* acc3 = A[2 * i + 2] * B[2 * i + 2] - A[2 * i + 3] * B[2 * i + 3] */
+ *pDst = acc1; /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1] */
+
+ b1 = *(pSrcA + 5); /* A[2 * i + 5] */
+ acc4 += b2 * c2; /* acc4 = A[2 * i + 2] * B[2 * i + 3] + A[2 * i + 3] * B[2 * i + 2] */
+
+ *(pDst + 1) = acc2; /* C[2 * i + 1] = A[2 * i + 1] * B[2 * i] + A[2 * i] * B[2 * i + 1] */
+ acc1 = (a1 * c1);
+
+ d1 = *(pSrcB + 5);
+ acc2 = (b1 * c1);
+
+ *(pDst + 2) = acc3;
+ *(pDst + 3) = acc4;
+
+ a2 = *(pSrcA + 6);
+ acc1 -= (b1 * d1);
+
+ c2 = *(pSrcB + 6);
+ acc2 += (a1 * d1);
+
+ b2 = *(pSrcA + 7);
+ acc3 = (a2 * c2);
+
+ d2 = *(pSrcB + 7);
+ acc4 = (b2 * c2);
+
+ *(pDst + 4) = acc1;
+ pSrcA += 8u;
+
+ acc3 -= (b2 * d2);
+ acc4 += (a2 * d2);
+
+ *(pDst + 5) = acc2;
+ pSrcB += 8u;
+
+ *(pDst + 6) = acc3;
+ *(pDst + 7) = acc4;
+
+ pDst += 8u;
+
+ /* Decrement the numSamples loop counter */
+ blkCnt--;
+ }
+
+ /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = numSamples % 0x4u;
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+ blkCnt = numSamples;
+
+#endif /* #ifndef ARM_MATH_CM0 */
+
+ while(blkCnt > 0u)
+ {
+ /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */
+ /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */
+ a1 = *pSrcA++;
+ b1 = *pSrcA++;
+ c1 = *pSrcB++;
+ d1 = *pSrcB++;
+
+ /* store the result in the destination buffer. */
+ *pDst++ = (a1 * c1) - (b1 * d1);
+ *pDst++ = (a1 * d1) + (b1 * c1);
+
+ /* Decrement the numSamples loop counter */
+ blkCnt--;
+ }
+}
+
+/**
+ * @} end of CmplxByCmplxMult group
+ */
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