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VCP2译码结果问题

基本参考C6455的例程VCP2_hard_decisions,帧长440比特,约束长度为7,码率1/3,收敛回溯模式,多项式是(133,171,165),hard_decisions例程里好像没有专门配置多项式的地方,好像是用默认的,根据手册,我用VCP2_poly poly = {0xB4,0x3C,0x5C}来配置多项式,配置EDMA使cpu和VCP2之间交互,将译码结果发送给cpu后EDMA发送完成中断给cpu,分度量支按照手册进行计算组合的。我用55个字节的[1 1 1 1 1 1 1 1]或[0 0 0 0 0 0 0 0]或[0 1 0 1 0 1 0 1]或[1 0 1 0 1 0 1 0]作为信息源,译码结果是正确的,但是用其他信息源,译码结果就会有很多错误,不知道像这样的错误是哪个配置环节出错导致的?谢谢