RM0020 datasheet(6/69 Pages) STMICROELECTRONICS

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Library functions

RM0020

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Library functions

The library functions are presented in the following sections.

1.1

FFT

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bitrev_table_16bit - Bit Reversal Permutation for 16-bit data (frac16)

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bitrev_table_32bit - Bit Reversal Permutation for 32-bit data (frac32 and float)

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fft_radix4_float - N-point radix-4 complex to complex float in-place FFT, N is even

power of two

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fft_radix4_frac32 - N-point radix-4 complex to complex frac16/frac32 in-place FFT, N

is even power of two

●

fft_quad_float - N-point quad radix-2 complex to complex float in-place FFT, N is even

power of two

●

fft_quad_frac32 - N-point quad radix-2 complex to complex frac16/frac32 in-place

FFT, N is even power of two

●

fft_radix2_last_stage_float - calculates the last stage of N-point radix-2 complex to

complex float in-place FFT, together with fft_quad_float function is used to calculate

N-point complex to complex float in-place FFT where N is odd power of two

●

fft_radix2_last_stage_frac32 - calculates the last stage of N-point radix-2 complex to

complex frac32 in-place radix-2 FFT, together with fft_quad_frac32 function is used to

calculate N-point complex to complex in-place frac16/frac32 FFT where N is odd power

of two

●

fft_real_split_float - split function for N-point real to complex float FFT

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fft_real_split_frac32 - split function for N-point real to complex frac32 FFT

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window_apply_complex_float - complex float windowing function

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window_apply_complex_frac16 - complex frac16 windowing function

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window_apply_real_float - real float windowing function

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window_apply_real_frac16 - real frac16 windowing function

1.2

Pressure sensing

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mfb50_pmh - calculates mass fraction burned (MFB), MFB50 value and PMH index

●

mfb50_index - calculates MFB50 position index

1.3

Image

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conv3x3 - 2-D convolution with 3x3 kernel

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sobel3x3 - sobel filter

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sobel3x3_horizontal - horizontal sobel filter

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sobel3x3_vertical - vertical sobel filter

RM0020 数据表(PDF) 6 Page - STMicroelectronics

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