Convert 32-bit floating point valueSupport 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.
 

Description

Function Documentation

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

References blockSize.

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

References blockSize, and clip_q63_to_q31().

Referenced by main().

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

References blockSize.