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协议栈开启PA功能之后LED3不能闪烁

Other Parts Discussed in Thread: CC2590

我使用的是ZStack-CC2530-2.5.1a,在我开启PA功能之前,我的LED3是这样配置:

#define LED3_BV BV(7)
#define LED3_SBIT P1_7
#define LED3_DDR P1DIR
#define LED3_POLARITY ACTIVE_HIGH

节点的入网情况能够通过LED3的闪烁来提示

HalLedBlink ( HAL_LED_3, 0, 50, 500 );    //提示未加入网络

但当我开启PA功能之后,LED3就不能闪烁了,我查看了协议栈,没有发现I/O引脚复用,

请问什么原因导致开启PA功能之后,LED3不能闪烁?