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cc1101中GDO2发送/接收到同步字时置位

ke zhong
Prodigy 60 points
Other Parts Discussed in Thread: CC1101

请教大神们：

我用cc1101写433MHz的接收模块，GDO2置位的程序如下：

void GDO2_HIGH_WAIT(void)
{
while((PC_IDR & 0x10) == 0x00); // pC4
}

然而，pc4一直输出低电平，这样就导致不能读缓存寄存器。

求大神解答原因