1 files changed, 126 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q7.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q7.c
new file mode 100644
index 0000000..a27223f
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q7.c
@@ -0,0 +1,126 @@
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_negate_q7.c
+ * Description:  Negates Q7 vectors
+ *
+ * $Date:        18. March 2019
+ * $Revision:    V1.6.0
+ *
+ * Target Processor: Cortex-M cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "arm_math.h"
+
+/**
+  @ingroup groupMath
+ */
+
+/**
+  @addtogroup BasicNegate
+  @{
+ */
+
+/**
+  @brief         Negates the elements of a Q7 vector.
+  @param[in]     pSrc       points to the input vector.
+  @param[out]    pDst       points to the output vector.
+  @param[in]     blockSize   number of samples in each vector.
+  @return        none
+
+  @par           Scaling and Overflow Behavior
+                   The function uses saturating arithmetic.
+                   The Q7 value -1 (0x80) is saturated to the maximum allowable positive value 0x7F.
+ */
+
+void arm_negate_q7(
+  const q7_t * pSrc,
+        q7_t * pDst,
+        uint32_t blockSize)
+{
+        uint32_t blkCnt;                               /* Loop counter */
+        q7_t in;                                       /* Temporary input variable */
+
+#if defined (ARM_MATH_LOOPUNROLL)
+
+#if defined (ARM_MATH_DSP)
+  q31_t in1;                                    /* Temporary input variable */
+#endif
+
+  /* Loop unrolling: Compute 4 outputs at a time */
+  blkCnt = blockSize >> 2U;
+
+  while (blkCnt > 0U)
+  {
+    /* C = -A */
+
+#if defined (ARM_MATH_DSP)
+    /* Negate and store result in destination buffer (4 samples at a time). */
+    in1 = read_q7x4_ia ((q7_t **) &pSrc);
+    write_q7x4_ia (&pDst, __QSUB8(0, in1));
+#else
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+
+    in = *pSrc++;
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+#endif
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+  /* Loop unrolling: Compute remaining outputs */
+  blkCnt = blockSize % 0x4U;
+
+#else
+
+  /* Initialize blkCnt with number of samples */
+  blkCnt = blockSize;
+
+#endif /* #if defined (ARM_MATH_LOOPUNROLL) */
+
+  while (blkCnt > 0U)
+  {
+    /* C = -A */
+
+    /* Negate and store result in destination buffer. */
+    in = *pSrc++;
+
+#if defined (ARM_MATH_DSP)
+    *pDst++ = (q7_t) __QSUB(0, in);
+#else
+    *pDst++ = (in == (q7_t) 0x80) ? (q7_t) 0x7f : -in;
+#endif
+
+    /* Decrement loop counter */
+    blkCnt--;
+  }
+
+}
+
+/**
+  @} end of BasicNegate group
+ */