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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Convert 32-bit floating point value
Functions

Convert 32-bit floating point value
[Support Functions]

Functions

void arm_float_to_q15 (float32_t *pSrc, q15_t *pDst, uint32_t blockSize)
 Converts the elements of the floating-point vector to Q15 vector.
void arm_float_to_q31 (float32_t *pSrc, q31_t *pDst, uint32_t blockSize)
 Converts the elements of the floating-point vector to Q31 vector.
void arm_float_to_q7 (float32_t *pSrc, q7_t *pDst, uint32_t blockSize)
 Converts the elements of the floating-point vector to Q7 vector.

Function Documentation

void arm_float_to_q15 ( float32_t *  pSrc,
q15_t *  pDst,
uint32_t  blockSize 
)

Converts the elements of the floating-point vector to Q15 vector.

Parameters:
[in]*pSrcpoints to the floating-point input vector
[out]*pDstpoints to the Q15 output vector
[in]blockSizelength of the input vector
Returns:
none.
Description:
The equation used for the conversion process is: 
    
 	pDst[n] = (q15_t)(pSrc[n] * 32768);   0 <= n < blockSize.
Scaling and Overflow Behavior:
The function uses saturating arithmetic. Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated.
Note:
In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options.

Definition at line 76 of file arm_float_to_q15.c.

void arm_float_to_q31 ( float32_t *  pSrc,
q31_t *  pDst,
uint32_t  blockSize 
)

Converts the elements of the floating-point vector to Q31 vector.

Parameters:
[in]*pSrcpoints to the floating-point input vector
[out]*pDstpoints to the Q31 output vector
[in]blockSizelength of the input vector
Returns:
none.
Description:
The equation used for the conversion process is:
    
 	pDst[n] = (q31_t)(pSrc[n] * 2147483648);   0 <= n < blockSize.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] will be saturated.
Note:
In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options.

Definition at line 80 of file arm_float_to_q31.c.

void arm_float_to_q7 ( float32_t *  pSrc,
q7_t *  pDst,
uint32_t  blockSize 
)

Converts the elements of the floating-point vector to Q7 vector.

Parameters:
[in]*pSrcpoints to the floating-point input vector
[out]*pDstpoints to the Q7 output vector
[in]blockSizelength of the input vector
Returns:
none.
Description:
The equation used for the conversion process is: 
    
 	pDst[n] = (q7_t)(pSrc[n] * 128);   0 <= n < blockSize.
Scaling and Overflow Behavior:
The function uses saturating arithmetic. Results outside of the allowable Q7 range [0x80 0x7F] will be saturated.
Note:
In order to apply rounding, the library should be rebuilt with the ROUNDING macro defined in the preprocessor section of project options.

Definition at line 75 of file arm_float_to_q7.c.

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