From 76177aa280494bb36d7a0bcbda1078d4db717020 Mon Sep 17 00:00:00 2001 From: Ali Labbene Date: Mon, 9 Dec 2019 11:25:19 +0100 Subject: Official ARM version: v4.5 --- Documentation/DSP/html/group__inv__clarke.html | 261 +++++++++++++++++++++++++ 1 file changed, 261 insertions(+) create mode 100644 Documentation/DSP/html/group__inv__clarke.html (limited to 'Documentation/DSP/html/group__inv__clarke.html') diff --git a/Documentation/DSP/html/group__inv__clarke.html b/Documentation/DSP/html/group__inv__clarke.html new file mode 100644 index 0000000..76ad1e3 --- /dev/null +++ b/Documentation/DSP/html/group__inv__clarke.html @@ -0,0 +1,261 @@ + + + + + +Vector Inverse Clarke Transform +CMSIS-DSP: Vector Inverse Clarke Transform + + + + + + + + + + + + + + + +
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CMSIS-DSP +  Version 1.4.7 +
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CMSIS DSP Software Library
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+Functions
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Vector Inverse Clarke Transform
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Controller Functions
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+Functions

static __INLINE void arm_inv_clarke_f32 (float32_t Ialpha, float32_t Ibeta, float32_t *pIa, float32_t *pIb)
 Floating-point Inverse Clarke transform.
 
static __INLINE void arm_inv_clarke_q31 (q31_t Ialpha, q31_t Ibeta, q31_t *pIa, q31_t *pIb)
 Inverse Clarke transform for Q31 version.
 
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Description

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Inverse Clarke transform converts the two-coordinate time invariant vector into instantaneous stator phases.

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The function operates on a single sample of data and each call to the function returns the processed output. The library provides separate functions for Q31 and floating-point data types.

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Algorithm
+clarkeInvFormula.gif +
+ where pIa and pIb are the instantaneous stator phases and Ialpha and Ibeta are the two coordinates of time invariant vector.
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Fixed-Point Behavior
Care must be taken when using the Q31 version of the Clarke transform. In particular, the overflow and saturation behavior of the accumulator used must be considered. Refer to the function specific documentation below for usage guidelines.
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Function Documentation

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static __INLINE void arm_inv_clarke_f32 (float32_t Ialpha,
float32_t Ibeta,
float32_t * pIa,
float32_t * pIb 
)
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Parameters
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[in]Ialphainput two-phase orthogonal vector axis alpha
[in]Ibetainput two-phase orthogonal vector axis beta
[out]pIapoints to output three-phase coordinate a
[out]pIbpoints to output three-phase coordinate b
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static __INLINE void arm_inv_clarke_q31 (q31_t Ialpha,
q31_t Ibeta,
q31_t * pIa,
q31_t * pIb 
)
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Parameters
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[in]Ialphainput two-phase orthogonal vector axis alpha
[in]Ibetainput two-phase orthogonal vector axis beta
[out]pIapoints to output three-phase coordinate a
[out]pIbpoints to output three-phase coordinate b
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Scaling and Overflow Behavior:

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The function is implemented using an internal 32-bit accumulator. The accumulator maintains 1.31 format by truncating lower 31 bits of the intermediate multiplication in 2.62 format. There is saturation on the subtraction, hence there is no risk of overflow.
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+ + + + -- cgit