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f28335调用fft.lib的问题

CCS3.3平台,调用fft.lib,出现一直在下面四条语句循环:

3FF626 CC1C8000    AND        AL,@28,#0x8000
3FF628 FFCE        LSR        AL,15
3FF629 5201        CMPB       AL,#1
3FF62A EDFC        SBF        -4,NEQ

不知道是哪个地方有问题,求各位大神解答?