比如浮点数转Q15：
#ifdef ARM_MATH_ROUNDING
/* C = A * 32768 */
/* Convert from float to q15 and then store the results in the destination buffer */
in = *pIn++;
in = (in * 32768.0f);
in += in > 0.0f ? 0.5f : -0.5f;
*pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
#else
/* C = A * 32768 */
/* Convert from float to q15 and then store the results in the destination buffer */
*pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
#endif /* #ifdef ARM_MATH_ROUNDING */ |
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楼主
