Diff: src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_mult_real_f32.c

Revision:

0:1014af42efd9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_mult_real_f32.c	Thu Mar 10 15:07:50 2011 +0000
@@ -0,0 +1,130 @@
+/* ----------------------------------------------------------------------  
+* Copyright (C) 2010 ARM Limited. All rights reserved.  
+*  
+* $Date:        29. November 2010  
+* $Revision: 	V1.0.3  
+*  
+* Project: 	    CMSIS DSP Library  
+* Title:	    arm_cmplx_mult_real_f32.c  
+*  
+* Description:	Floating-point complex by real multiplication  
+*  
+* Target Processor: Cortex-M4/Cortex-M3
+*  
+* 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 CmplxByRealMult Complex-by-Real Multiplication  
+ *  
+ * Multiplies a complex vector by a real 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 while the real array has a total of <code>numSamples</code>  
+ * real values.  
+ *  
+ * The underlying algorithm is used:  
+ *  
+ * <pre>  
+ * for(n=0; n<numSamples; n++) {  
+ *     pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n];  
+ *     pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n];  
+ * }  
+ * </pre>  
+ *  
+ * There are separate functions for floating-point, Q15, and Q31 data types.  
+ */ 
+ 
+/**  
+ * @addtogroup CmplxByRealMult  
+ * @{  
+ */ 
+ 
+ 
+/**  
+ * @brief  Floating-point complex-by-real multiplication  
+ * @param[in]  *pSrcCmplx points to the complex input vector  
+ * @param[in]  *pSrcReal points to the real input vector  
+ * @param[out]  *pCmplxDst points to the complex output vector  
+ * @param[in]  numSamples number of samples in each vector  
+ * @return none.  
+ */ 
+ 
+void arm_cmplx_mult_real_f32( 
+  float32_t * pSrcCmplx, 
+  float32_t * pSrcReal, 
+  float32_t * pCmplxDst, 
+  uint32_t numSamples) 
+{ 
+  float32_t in;                                  /* Temporary variable to store input value */ 
+  uint32_t blkCnt;                               /* loop counters */ 
+ 
+  /* 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[i].            */ 
+    /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */ 
+    in = *pSrcReal++; 
+    /* store the result in the destination buffer. */ 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+ 
+    in = *pSrcReal++; 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+ 
+    in = *pSrcReal++; 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+ 
+    in = *pSrcReal++; 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+ 
+    /* 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; 
+ 
+  while(blkCnt > 0u) 
+  { 
+    /* C[2 * i] = A[2 * i] * B[i].            */ 
+    /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */ 
+    in = *pSrcReal++; 
+    /* store the result in the destination buffer. */ 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+    *pCmplxDst++ = (*pSrcCmplx++) * (in); 
+ 
+    /* Decrement the numSamples loop counter */ 
+    blkCnt--; 
+  } 
+} 
+ 
+/**  
+ * @} end of CmplxByRealMult group  
+ */