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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | #include "ref.h" |
| 2 | |||
| 3 | |||
| 4 | ;/* |
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| 5 | ;* @brief In-place bit reversal function. |
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| 6 | ;* @param[in, out] *pSrc points to the in-place buffer of unknown 32-bit data type. |
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| 7 | ;* @param[in] bitRevLen bit reversal table length |
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| 8 | ;* @param[in] *pBitRevTab points to bit reversal table. |
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| 9 | ;* @return none. |
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| 10 | ;*/ |
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| 11 | void arm_bitreversal_32(uint32_t *pSrc, uint32_t bitRevLen, uint32_t *pBitRevTab) |
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| 12 | { |
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| 13 | uint32_t a,b,i,tmp; |
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| 14 | |||
| 15 | for(i=0; i<bitRevLen; i++) |
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| 16 | { |
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| 17 | a = pBitRevTab[2*i]; |
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| 18 | b = pBitRevTab[2*i + 1]; |
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| 19 | |||
| 20 | //real |
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| 21 | tmp = pSrc[a]; |
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| 22 | pSrc[a] = pSrc[b]; |
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| 23 | pSrc[b] = tmp; |
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| 24 | |||
| 25 | //complex |
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| 26 | tmp = pSrc[a+1]; |
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| 27 | pSrc[a+1] = pSrc[b+1]; |
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| 28 | pSrc[b+1] = tmp; |
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| 29 | } |
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| 30 | } |