diff options
Diffstat (limited to 'fw/midi-dials/Drivers/CMSIS/DSP/DSP_Lib_TestSuite/RefLibs/src/TransformFunctions/bitreversal.c')
| -rw-r--r-- | fw/midi-dials/Drivers/CMSIS/DSP/DSP_Lib_TestSuite/RefLibs/src/TransformFunctions/bitreversal.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/fw/midi-dials/Drivers/CMSIS/DSP/DSP_Lib_TestSuite/RefLibs/src/TransformFunctions/bitreversal.c b/fw/midi-dials/Drivers/CMSIS/DSP/DSP_Lib_TestSuite/RefLibs/src/TransformFunctions/bitreversal.c new file mode 100644 index 0000000..4751821 --- /dev/null +++ b/fw/midi-dials/Drivers/CMSIS/DSP/DSP_Lib_TestSuite/RefLibs/src/TransformFunctions/bitreversal.c @@ -0,0 +1,30 @@ +#include "ref.h"
+
+
+;/*
+;* @brief In-place bit reversal function.
+;* @param[in, out] *pSrc points to the in-place buffer of unknown 32-bit data type.
+;* @param[in] bitRevLen bit reversal table length
+;* @param[in] *pBitRevTab points to bit reversal table.
+;* @return none.
+;*/
+void arm_bitreversal_32(uint32_t *pSrc, uint32_t bitRevLen, uint32_t *pBitRevTab)
+{
+ uint32_t a,b,i,tmp;
+
+ for(i=0; i<bitRevLen; i++)
+ {
+ a = pBitRevTab[2*i];
+ b = pBitRevTab[2*i + 1];
+
+ //real
+ tmp = pSrc[a];
+ pSrc[a] = pSrc[b];
+ pSrc[b] = tmp;
+
+ //complex
+ tmp = pSrc[a+1];
+ pSrc[a+1] = pSrc[b+1];
+ pSrc[b+1] = tmp;
+ }
+}
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