Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

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Partial Convolution
Functions

Partial Convolution
[Filtering Functions]

Partial Convolution is equivalent to Convolution except that a subset of the output samples is generated. More...

Functions

arm_status arm_conv_partial_f32 (float32_t *pSrcA, uint32_t srcALen, float32_t *pSrcB, uint32_t srcBLen, float32_t *pDst, uint32_t firstIndex, uint32_t numPoints)
 Partial convolution of floating-point sequences.
arm_status arm_conv_partial_fast_opt_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints, q15_t *pScratch1, q15_t *pScratch2)
 Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4.
arm_status arm_conv_partial_fast_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints)
 Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4.
arm_status arm_conv_partial_fast_q31 (q31_t *pSrcA, uint32_t srcALen, q31_t *pSrcB, uint32_t srcBLen, q31_t *pDst, uint32_t firstIndex, uint32_t numPoints)
 Partial convolution of Q31 sequences (fast version) for Cortex-M3 and Cortex-M4.
arm_status arm_conv_partial_opt_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints, q15_t *pScratch1, q15_t *pScratch2)
 Partial convolution of Q15 sequences.
arm_status arm_conv_partial_opt_q7 (q7_t *pSrcA, uint32_t srcALen, q7_t *pSrcB, uint32_t srcBLen, q7_t *pDst, uint32_t firstIndex, uint32_t numPoints, q15_t *pScratch1, q15_t *pScratch2)
 Partial convolution of Q7 sequences.
arm_status arm_conv_partial_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints)
 Partial convolution of Q15 sequences.
arm_status arm_conv_partial_q31 (q31_t *pSrcA, uint32_t srcALen, q31_t *pSrcB, uint32_t srcBLen, q31_t *pDst, uint32_t firstIndex, uint32_t numPoints)
 Partial convolution of Q31 sequences.
arm_status arm_conv_partial_q7 (q7_t *pSrcA, uint32_t srcALen, q7_t *pSrcB, uint32_t srcBLen, q7_t *pDst, uint32_t firstIndex, uint32_t numPoints)
 Partial convolution of Q7 sequences.

Detailed Description

Partial Convolution is equivalent to Convolution except that a subset of the output samples is generated.

Each function has two additional arguments. firstIndex specifies the starting index of the subset of output samples. numPoints is the number of output samples to compute. The function computes the output in the range [firstIndex, ..., firstIndex+numPoints-1]. The output array pDst contains numPoints values.

The allowable range of output indices is [0 srcALen+srcBLen-2]. If the requested subset does not fall in this range then the functions return ARM_MATH_ARGUMENT_ERROR. Otherwise the functions return ARM_MATH_SUCCESS.

Note:
Refer arm_conv_f32() for details on fixed point behavior.

Fast Versions

Fast versions are supported for Q31 and Q15 of partial convolution. Cycles for Fast versions are less compared to Q31 and Q15 of partial conv and the design requires the input signals should be scaled down to avoid intermediate overflows.

Opt Versions

Opt versions are supported for Q15 and Q7. Design uses internal scratch buffer for getting good optimisation. These versions are optimised in cycles and consumes more memory(Scratch memory) compared to Q15 and Q7 versions of partial convolution

Function Documentation

arm_status arm_conv_partial_f32 ( float32_t *  pSrcA,
uint32_t  srcALen,
float32_t *  pSrcB,
uint32_t  srcBLen,
float32_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints 
)

Partial convolution of floating-point sequences.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Definition at line 95 of file arm_conv_partial_f32.c.

arm_status arm_conv_partial_fast_opt_q15 ( q15_t *  pSrcA,
uint32_t  srcALen,
q15_t *  pSrcB,
uint32_t  srcBLen,
q15_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints,
q15_t *  pScratch1,
q15_t *  pScratch2 
)

Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
[in]*pScratch1points to scratch buffer of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
[in]*pScratch2points to scratch buffer of size min(srcALen, srcBLen).
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_q15() for a slower implementation of this function which uses a 64-bit accumulator to avoid wrap around distortion.

Restrictions
If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, scratch1 and scratch2 buffers should be aligned by 32-bit

Definition at line 75 of file arm_conv_partial_fast_opt_q15.c.

arm_status arm_conv_partial_fast_q15 ( q15_t *  pSrcA,
uint32_t  srcALen,
q15_t *  pSrcB,
uint32_t  srcBLen,
q15_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints 
)

Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_q15() for a slower implementation of this function which uses a 64-bit accumulator to avoid wrap around distortion.

Definition at line 67 of file arm_conv_partial_fast_q15.c.

arm_status arm_conv_partial_fast_q31 ( q31_t *  pSrcA,
uint32_t  srcALen,
q31_t *  pSrcB,
uint32_t  srcBLen,
q31_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints 
)

Partial convolution of Q31 sequences (fast version) for Cortex-M3 and Cortex-M4.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].
See arm_conv_partial_q31() for a slower implementation of this function which uses a 64-bit accumulator to provide higher precision.

Definition at line 67 of file arm_conv_partial_fast_q31.c.

arm_status arm_conv_partial_opt_q15 ( q15_t *  pSrcA,
uint32_t  srcALen,
q15_t *  pSrcB,
uint32_t  srcBLen,
q15_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints,
q15_t *  pScratch1,
q15_t *  pScratch2 
)

Partial convolution of Q15 sequences.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
[in]*pScratch1points to scratch buffer of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
[in]*pScratch2points to scratch buffer of size min(srcALen, srcBLen).
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].
Restrictions
If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, state buffers should be aligned by 32-bit

Refer to arm_conv_partial_fast_q15() for a faster but less precise version of this function for Cortex-M3 and Cortex-M4.

Definition at line 76 of file arm_conv_partial_opt_q15.c.

arm_status arm_conv_partial_opt_q7 ( q7_t *  pSrcA,
uint32_t  srcALen,
q7_t *  pSrcB,
uint32_t  srcBLen,
q7_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints,
q15_t *  pScratch1,
q15_t *  pScratch2 
)

Partial convolution of Q7 sequences.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
[in]*pScratch1points to scratch buffer(of type q15_t) of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
[in]*pScratch2points to scratch buffer (of type q15_t) of size min(srcALen, srcBLen).
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].
Restrictions
If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, scratch1 and scratch2 buffers should be aligned by 32-bit

Definition at line 76 of file arm_conv_partial_opt_q7.c.

arm_status arm_conv_partial_q15 ( q15_t *  pSrcA,
uint32_t  srcALen,
q15_t *  pSrcB,
uint32_t  srcBLen,
q15_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints 
)

Partial convolution of Q15 sequences.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Refer to arm_conv_partial_fast_q15() for a faster but less precise version of this function for Cortex-M3 and Cortex-M4.

Refer the function arm_conv_partial_opt_q15() for a faster implementation of this function using scratch buffers.

Definition at line 71 of file arm_conv_partial_q15.c.

arm_status arm_conv_partial_q31 ( q31_t *  pSrcA,
uint32_t  srcALen,
q31_t *  pSrcB,
uint32_t  srcBLen,
q31_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints 
)

Partial convolution of Q31 sequences.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_fast_q31() for a faster but less precise implementation of this function for Cortex-M3 and Cortex-M4.

Definition at line 66 of file arm_conv_partial_q31.c.

arm_status arm_conv_partial_q7 ( q7_t *  pSrcA,
uint32_t  srcALen,
q7_t *  pSrcB,
uint32_t  srcBLen,
q7_t *  pDst,
uint32_t  firstIndex,
uint32_t  numPoints 
)

Partial convolution of Q7 sequences.

Parameters:
[in]*pSrcApoints to the first input sequence.
[in]srcALenlength of the first input sequence.
[in]*pSrcBpoints to the second input sequence.
[in]srcBLenlength of the second input sequence.
[out]*pDstpoints to the location where the output result is written.
[in]firstIndexis the first output sample to start with.
[in]numPointsis the number of output points to be computed.
Returns:
Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].
Refer the function arm_conv_partial_opt_q7() for a faster implementation of this function.

Definition at line 68 of file arm_conv_partial_q7.c.

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