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author | Julian Oes <julian@oes.ch> | 2013-05-17 11:24:02 +0200 |
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committer | Julian Oes <julian@oes.ch> | 2013-05-17 11:24:02 +0200 |
commit | f5c157e74df12a0cb36b7d27cdad9828d96cc534 (patch) | |
tree | 3f758990921a7b52df8afe5131a8298b1141b6f4 /src/modules/mathlib/CMSIS/DSP_Lib/Source/SupportFunctions/arm_q15_to_q7.c | |
parent | 80e8eeab2931e79e31adb17c93f5794e666c5763 (diff) | |
parent | fa816d0fd65da461fd5bf8803cf00caebaf23c5c (diff) | |
download | px4-firmware-f5c157e74df12a0cb36b7d27cdad9828d96cc534.tar.gz px4-firmware-f5c157e74df12a0cb36b7d27cdad9828d96cc534.tar.bz2 px4-firmware-f5c157e74df12a0cb36b7d27cdad9828d96cc534.zip |
Merge remote-tracking branch 'upstream/master' into new_state_machine
Conflicts:
src/drivers/px4io/px4io.cpp
src/modules/commander/commander.c
src/modules/commander/state_machine_helper.c
Diffstat (limited to 'src/modules/mathlib/CMSIS/DSP_Lib/Source/SupportFunctions/arm_q15_to_q7.c')
-rw-r--r-- | src/modules/mathlib/CMSIS/DSP_Lib/Source/SupportFunctions/arm_q15_to_q7.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/modules/mathlib/CMSIS/DSP_Lib/Source/SupportFunctions/arm_q15_to_q7.c b/src/modules/mathlib/CMSIS/DSP_Lib/Source/SupportFunctions/arm_q15_to_q7.c new file mode 100644 index 000000000..87fe63d9e --- /dev/null +++ b/src/modules/mathlib/CMSIS/DSP_Lib/Source/SupportFunctions/arm_q15_to_q7.c @@ -0,0 +1,146 @@ +/* ----------------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_q15_to_q7.c
+*
+* Description: Converts the elements of the Q15 vector to Q7 vector.
+*
+* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
+*
+* Version 1.1.0 2012/02/15
+* Updated with more optimizations, bug fixes and minor API changes.
+*
+* Version 1.0.10 2011/7/15
+* Big Endian support added and Merged M0 and M3/M4 Source code.
+*
+* Version 1.0.3 2010/11/29
+* Re-organized the CMSIS folders and updated documentation.
+*
+* Version 1.0.2 2010/11/11
+* Documentation updated.
+*
+* Version 1.0.1 2010/10/05
+* Production release and review comments incorporated.
+*
+* Version 1.0.0 2010/09/20
+* Production release and review comments incorporated.
+* ---------------------------------------------------------------------------- */
+
+#include "arm_math.h"
+
+/**
+ * @ingroup groupSupport
+ */
+
+/**
+ * @addtogroup q15_to_x
+ * @{
+ */
+
+
+/**
+ * @brief Converts the elements of the Q15 vector to Q7 vector.
+ * @param[in] *pSrc points to the Q15 input vector
+ * @param[out] *pDst points to the Q7 output vector
+ * @param[in] blockSize length of the input vector
+ * @return none.
+ *
+ * \par Description:
+ *
+ * The equation used for the conversion process is:
+ *
+ * <pre>
+ * pDst[n] = (q7_t) pSrc[n] >> 8; 0 <= n < blockSize.
+ * </pre>
+ *
+ */
+
+
+void arm_q15_to_q7(
+ q15_t * pSrc,
+ q7_t * pDst,
+ uint32_t blockSize)
+{
+ q15_t *pIn = pSrc; /* Src pointer */
+ uint32_t blkCnt; /* loop counter */
+
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+ q31_t in1, in2;
+ q31_t out1, out2;
+
+ /*loop Unrolling */
+ blkCnt = blockSize >> 2u;
+
+ /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
+ ** a second loop below computes the remaining 1 to 3 samples. */
+ while(blkCnt > 0u)
+ {
+ /* C = (q7_t) A >> 8 */
+ /* convert from q15 to q7 and then store the results in the destination buffer */
+ in1 = *__SIMD32(pIn)++;
+ in2 = *__SIMD32(pIn)++;
+
+#ifndef ARM_MATH_BIG_ENDIAN
+
+ out1 = __PKHTB(in2, in1, 16);
+ out2 = __PKHBT(in2, in1, 16);
+
+#else
+
+ out1 = __PKHTB(in1, in2, 16);
+ out2 = __PKHBT(in1, in2, 16);
+
+#endif // #ifndef ARM_MATH_BIG_ENDIAN
+
+ /* rotate packed value by 24 */
+ out2 = ((uint32_t) out2 << 8) | ((uint32_t) out2 >> 24);
+
+ /* anding with 0xff00ff00 to get two 8 bit values */
+ out1 = out1 & 0xFF00FF00;
+ /* anding with 0x00ff00ff to get two 8 bit values */
+ out2 = out2 & 0x00FF00FF;
+
+ /* oring two values(contains two 8 bit values) to get four packed 8 bit values */
+ out1 = out1 | out2;
+
+ /* store 4 samples at a time to destiantion buffer */
+ *__SIMD32(pDst)++ = out1;
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+ /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
+ ** No loop unrolling is used. */
+ blkCnt = blockSize % 0x4u;
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+
+ /* Loop over blockSize number of values */
+ blkCnt = blockSize;
+
+#endif /* #ifndef ARM_MATH_CM0 */
+
+ while(blkCnt > 0u)
+ {
+ /* C = (q7_t) A >> 8 */
+ /* convert from q15 to q7 and then store the results in the destination buffer */
+ *pDst++ = (q7_t) (*pIn++ >> 8);
+
+ /* Decrement the loop counter */
+ blkCnt--;
+ }
+
+}
+
+/**
+ * @} end of q15_to_x group
+ */
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