cy_stc_hppass_fir_t Struct Reference

Description

The FIR filter Configuration structure.

Data Fields
cy_en_hppass_fir_chan_t	chan
	Filtering channel selection.
bool	waitTapInit
	Wait for 16 samples before the first valid result is available by the Cy_HPPASS_SAR_Result_FirRead function or FIFO. More...
int16_t	coef [CY_HPPASS_FIR_TAP_NUM]
	FIR Coefficient Values The coefficient values can range from -1+1/2^15 to 1-1/2^15 with a resolution of 1/2^15. More...
cy_en_hppass_sar_limit_t	limit
	Limit crossing detector selection.
bool	result
	The result is available by the Cy_HPPASS_SAR_Result_FirRead function and the result interrupt is generated.
cy_en_hppass_fifo_t	fifo
	FIFO selection.

Field Documentation

waitTapInit

bool cy_stc_hppass_fir_t::waitTapInit

Wait for 16 samples before the first valid result is available by the Cy_HPPASS_SAR_Result_FirRead function or FIFO.

This allows to ignore the FIR results until the FIR pipeline is initialized.

coef

int16_t cy_stc_hppass_fir_t::coef[CY_HPPASS_FIR_TAP_NUM]

FIR Coefficient Values The coefficient values can range from -1+1/2^15 to 1-1/2^15 with a resolution of 1/2^15.

The coefficient uses twos-complement notation and the decimal point is fixed to the right of the most significant bit. Examples: -0.25 = 0xE000 and 0.25 = 0x2000 The max absolute value of the FIR gain must be less than 8 (sum of all the coefficients), otherwise the result may overflow allocated 16-bits.