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| author | jaseg <git@jaseg.net> | 2020-10-14 12:47:28 +0200 |
|---|---|---|
| committer | jaseg <git@jaseg.net> | 2020-10-14 12:47:28 +0200 |
| commit | 6ab94e0b318884bbcb95e2ea3835f951502e1d99 (patch) | |
| tree | 4cc5794b89f89c55ff8370ae252518ab96b5fed3 /fw/midi-dials/Drivers/CMSIS/DSP/DSP_Lib_TestSuite/RefLibs/src/TransformFunctions/bitreversal.c | |
| parent | 1e6e8a2062923b434b2f4f5f2a9f8c0098135b01 (diff) | |
| download | minikbd-6ab94e0b318884bbcb95e2ea3835f951502e1d99.tar.gz minikbd-6ab94e0b318884bbcb95e2ea3835f951502e1d99.tar.bz2 minikbd-6ab94e0b318884bbcb95e2ea3835f951502e1d99.zip | |
Move firmware into subdirectory
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;
+ }
+}
|