1 /* ----------------------------------------------------------------------------
2 * Copyright (C) 2010 ARM Limited. All rights reserved.
7 * Project: CMSIS DSP Library
8 * Title: arm_q7_to_q15.c
10 * Description: Converts the elements of the Q7 vector to Q15 vector.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Version 1.0.10 2011/7/15
15 * Big Endian support added and Merged M0 and M3/M4 Source code.
17 * Version 1.0.3 2010/11/29
18 * Re-organized the CMSIS folders and updated documentation.
20 * Version 1.0.2 2010/11/11
21 * Documentation updated.
23 * Version 1.0.1 2010/10/05
24 * Production release and review comments incorporated.
26 * Version 1.0.0 2010/09/20
27 * Production release and review comments incorporated.
28 * ---------------------------------------------------------------------------- */
33 * @ingroup groupSupport
45 * @brief Converts the elements of the Q7 vector to Q15 vector.
46 * @param[in] *pSrc points to the Q7 input vector
47 * @param[out] *pDst points to the Q15 output vector
48 * @param[in] blockSize length of the input vector
53 * The equation used for the conversion process is:
56 * pDst[n] = (q15_t) pSrc[n] << 8; 0 <= n < blockSize.
67 q7_t *pIn = pSrc; /* Src pointer */
68 uint32_t blkCnt; /* loop counter */
72 /* Run the below code for Cortex-M4 and Cortex-M3 */
75 blkCnt = blockSize >> 2u;
77 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
78 ** a second loop below computes the remaining 1 to 3 samples. */
81 /* C = (q15_t) A << 8 */
82 /* convert from q7 to q15 and then store the results in the destination buffer */
83 *pDst++ = (q15_t) * pIn++ << 8;
84 *pDst++ = (q15_t) * pIn++ << 8;
85 *pDst++ = (q15_t) * pIn++ << 8;
86 *pDst++ = (q15_t) * pIn++ << 8;
88 /* Decrement the loop counter */
92 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
93 ** No loop unrolling is used. */
94 blkCnt = blockSize % 0x4u;
98 /* Run the below code for Cortex-M0 */
100 /* Loop over blockSize number of values */
103 #endif /* #ifndef ARM_MATH_CM0 */
107 /* C = (q15_t) A << 8 */
108 /* convert from q7 to q15 and then store the results in the destination buffer */
109 *pDst++ = (q15_t) * pIn++ << 8;
111 /* Decrement the loop counter */
118 * @} end of q7_to_x group