diff options
Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c b/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c new file mode 100644 index 000000000..7475962d5 --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c @@ -0,0 +1,172 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_cmplx_conj_q31.c
+*
+* Description: Q31 complex conjugate.
+*
+* 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
+ */
+
+/**
+ * @addtogroup cmplx_conj
+ * @{
+ */
+
+/**
+ * @brief Q31 complex conjugate.
+ * @param *pSrc points to the input vector
+ * @param *pDst points to the output vector
+ * @param numSamples number of complex samples in each vector
+ * @return none.
+ *
+ * <b>Scaling and Overflow Behavior:</b>
+ * \par
+ * The function uses saturating arithmetic.
+ * The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF.
+ */
+
+void arm_cmplx_conj_q31(
+ q31_t * pSrc,
+ q31_t * pDst,
+ uint32_t numSamples)
+{
+ uint32_t blkCnt; /* loop counter */
+ q31_t in; /* Input value */
+
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+ q31_t inR1, inR2, inR3, inR4; /* Temporary real variables */
+ q31_t inI1, inI2, inI3, inI4; /* Temporary imaginary variables */
+
+ /*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[0]+jC[1] = A[0]+ j (-1) A[1] */
+ /* Calculate Complex Conjugate and then store the results in the destination buffer. */
+ /* Saturated to 0x7fffffff if the input is -1(0x80000000) */
+ /* read real input sample */
+ inR1 = pSrc[0];
+ /* store real input sample */
+ pDst[0] = inR1;
+
+ /* read imaginary input sample */
+ inI1 = pSrc[1];
+
+ /* read real input sample */
+ inR2 = pSrc[2];
+ /* store real input sample */
+ pDst[2] = inR2;
+
+ /* read imaginary input sample */
+ inI2 = pSrc[3];
+
+ /* negate imaginary input sample */
+ inI1 = __QSUB(0, inI1);
+
+ /* read real input sample */
+ inR3 = pSrc[4];
+ /* store real input sample */
+ pDst[4] = inR3;
+
+ /* read imaginary input sample */
+ inI3 = pSrc[5];
+
+ /* negate imaginary input sample */
+ inI2 = __QSUB(0, inI2);
+
+ /* read real input sample */
+ inR4 = pSrc[6];
+ /* store real input sample */
+ pDst[6] = inR4;
+
+ /* negate imaginary input sample */
+ inI3 = __QSUB(0, inI3);
+
+ /* store imaginary input sample */
+ inI4 = pSrc[7];
+
+ /* store imaginary input samples */
+ pDst[1] = inI1;
+
+ /* negate imaginary input sample */
+ inI4 = __QSUB(0, inI4);
+
+ /* store imaginary input samples */
+ pDst[3] = inI2;
+
+ /* increment source pointer by 8 to proecess next samples */
+ pSrc += 8u;
+
+ /* store imaginary input samples */
+ pDst[5] = inI3;
+ pDst[7] = inI4;
+
+ /* increment destination pointer by 8 to process next samples */
+ pDst += 8u;
+
+ /* Decrement the 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[0]+jC[1] = A[0]+ j (-1) A[1] */
+ /* Calculate Complex Conjugate and then store the results in the destination buffer. */
+ /* Saturated to 0x7fffffff if the input is -1(0x80000000) */
+ *pDst++ = *pSrc++;
+ in = *pSrc++;
+ *pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+}
+
+/**
+ * @} end of cmplx_conj group
+ */
|