官方的例程中
// low pass filter the data and decimate by 10 giving an
// effective sampling rate of 5kHz
for(i = 0; i < (DMA_BUFFER_SIZE / 20); i++) {
fTI[i] = foldedFIR(10, (fractional*) &In[i * 10],
&fir1500FilterI);
fTQ[i] = foldedFIR(10, (fractional*) &Qn[i * 10],
&fir1500FilterQ);
}
foldedFIR函数的原型在哪查看，编译器下也没有。
只是定义了fractional foldedFIR(unsigned int num, fractional* src, FIRStruct* fir);
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