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author | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
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committer | px4dev <px4@purgatory.org> | 2013-01-06 12:52:05 -0800 |
commit | 4447282260be0780eb6e36f5e953bf56888a5688 (patch) | |
tree | 3ba1e976d998d433397343b79a0612af52075aef /apps/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c | |
parent | 659543f852d18197f68fafee5db5671567b74f4b (diff) | |
download | px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.gz px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.tar.bz2 px4-firmware-4447282260be0780eb6e36f5e953bf56888a5688.zip |
Integrate the interesting parts of the CMSIS 3.01 (r3p1) DSP library
Diffstat (limited to 'apps/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c')
-rw-r--r-- | apps/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/apps/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c b/apps/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c new file mode 100644 index 000000000..dc2fdf624 --- /dev/null +++ b/apps/mathlib/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_f32.c @@ -0,0 +1,175 @@ +/* ----------------------------------------------------------------------
+* Copyright (C) 2010 ARM Limited. All rights reserved.
+*
+* $Date: 15. February 2012
+* $Revision: V1.1.0
+*
+* Project: CMSIS DSP Library
+* Title: arm_min_f32.c
+*
+* Description: Minimum value of a floating-point 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 groupStats
+ */
+
+/**
+ * @defgroup Min Minimum
+ *
+ * Computes the minimum value of an array of data.
+ * The function returns both the minimum value and its position within the array.
+ * There are separate functions for floating-point, Q31, Q15, and Q7 data types.
+ */
+
+/**
+ * @addtogroup Min
+ * @{
+ */
+
+
+/**
+ * @brief Minimum value of a floating-point vector.
+ * @param[in] *pSrc points to the input vector
+ * @param[in] blockSize length of the input vector
+ * @param[out] *pResult minimum value returned here
+ * @param[out] *pIndex index of minimum value returned here
+ * @return none.
+ *
+ */
+
+void arm_min_f32(
+ float32_t * pSrc,
+ uint32_t blockSize,
+ float32_t * pResult,
+ uint32_t * pIndex)
+{
+#ifndef ARM_MATH_CM0
+
+ /* Run the below code for Cortex-M4 and Cortex-M3 */
+
+ float32_t minVal1, minVal2, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex, count; /* loop counter */
+
+ /* Initialise the count value. */
+ count = 0u;
+ /* Initialise the index value to zero. */
+ outIndex = 0u;
+ /* Load first input value that act as reference value for comparision */
+ out = *pSrc++;
+
+ /* Loop unrolling */
+ blkCnt = (blockSize - 1u) >> 2u;
+
+ while(blkCnt > 0)
+ {
+ /* Initialize minVal to the next consecutive values one by one */
+ minVal1 = *pSrc++;
+ minVal2 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal1)
+ {
+ /* Update the minimum value and its index */
+ out = minVal1;
+ outIndex = count + 1u;
+ }
+
+ minVal1 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal2)
+ {
+ /* Update the minimum value and its index */
+ out = minVal2;
+ outIndex = count + 2u;
+ }
+
+ minVal2 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal1)
+ {
+ /* Update the minimum value and its index */
+ out = minVal1;
+ outIndex = count + 3u;
+ }
+
+ /* compare for the minimum value */
+ if(out > minVal2)
+ {
+ /* Update the minimum value and its index */
+ out = minVal2;
+ outIndex = count + 4u;
+ }
+
+ count += 4u;
+
+ blkCnt--;
+ }
+
+ /* if (blockSize - 1u ) is not multiple of 4 */
+ blkCnt = (blockSize - 1u) % 4u;
+
+#else
+
+ /* Run the below code for Cortex-M0 */
+ float32_t minVal1, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex; /* loop counter */
+
+ /* Initialise the index value to zero. */
+ outIndex = 0u;
+ /* Load first input value that act as reference value for comparision */
+ out = *pSrc++;
+
+ blkCnt = (blockSize - 1u);
+
+#endif // #ifndef ARM_MATH_CM0
+
+ while(blkCnt > 0)
+ {
+ /* Initialize minVal to the next consecutive values one by one */
+ minVal1 = *pSrc++;
+
+ /* compare for the minimum value */
+ if(out > minVal1)
+ {
+ /* Update the minimum value and it's index */
+ out = minVal1;
+ outIndex = blockSize - blkCnt;
+ }
+
+ blkCnt--;
+
+ }
+
+ /* Store the minimum value and it's index into destination pointers */
+ *pResult = out;
+ *pIndex = outIndex;
+}
+
+/**
+ * @} end of Min group
+ */
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